Bibliografie tematiche / Zincate

Letteratura scientifica selezionata sul tema "Zincate"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Zincate":

Semenov, V. V., N. V. Zolotareva, O. V. Novikova, B. I. Petrov, N. M. Lazarev, R. V. Rumyantsev, M. A. Lopatin, T. I. Lopatina, T. A. Kovylina e E. N. Razov. "Preparation of Water-Soluble Zinc(II) Complexes with Ethylenediaminetetraacetic Acid: Molecular Structure of Zinc Ethylenediaminetetraacetate Trihydrate". Координационная химия 49, n. 4 (1 aprile 2023): 205–16. http://dx.doi.org/10.31857/s0132344x22600436.

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Poorly soluble zinc ethylenediaminetetraacetate zincate Zn[ZnL] reacts with sodium Na4L, potassium K4L, ammonium (NH4)4L, 2-ammonioethanol (H3NCH2CH2OH)4L, and hexamethylene-1,6-diammonium {H3N(CH2)6NH3}2L salts of ethylenediaminetetraacetic acid H4L to give readily soluble sodium Na2[ZnL], potassium K2[ZnL], ammonium (NH4)2[ZnL], 2-ammonioethanol (H3NCH2CH2OH)2[ZnL], and hexamethylene-1,6-diammonium {H3N(CH2)6NH3}[ZnL] ethylenediaminetetraacetate zincates. The reaction of tetrakis(triethylammonium) salt {(C2H5)3NH}4L with Zn[ZnL] does not give the expected bis(triethylammonium) ethylenediaminetetraacetate zincate {(C2H5)3NH}2[ZnL], but gives instead mono(triethylammonium) ethylenediaminetetraacetate zincate, {(C2H5)3NH}H[ZnL]; in aqueous solution, this product generates poorly soluble zinc ethylenediaminetetraacetate H2[ZnL(H2O)]·2H2O, which was studied by X-ray diffraction (CCDC no. 2172274).

Westerhausen, Matthias, Bernd Rademacher, Wolfgang Schwarz e Sonja Henkel. "Lithium-zinkate mit heteroleptischem Triorganylzinkat-Anion / Lithium Zincates with Heteroleptic Triorganylzincate Anion". Zeitschrift für Naturforschung B 49, n. 2 (1 febbraio 1994): 199–210. http://dx.doi.org/10.1515/znb-1994-0208.

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Abstract Bis[bis(trimethylsilyl)methyl]-as well as bis(2,2,4,4,6,6-hexa-methyl-2,4,6-trisila-cyclo-hexyl)zinc react with methyl lithium or phenyl lithium in the pres ence of the tridentate l,3,5-trimethyl-l,3,5-triazinane (TMTA) to yield zincates of the type LiZnR2R'·2TMTA. The compounds are colorless and insoluble in aliphatic or aromatic hydrocarbons. These zincates exist in solution as well as in the crystalline state as separated ions, as confirmed for lithium-methyl-bis(2,2,4,4,6,6-hexamethyl-2,4,6-trisila-cyc/o-hexyl)-zincate · 2TMTA by X-ray diffraction (P1̄; a -1139,5(3); b = 1482,4(4); c = 1528,6(5) pm; α = 95,33(2); β = 100,13(2); γ = 106,91(2)°; Z = 2). The lithium cation is six-coordinated by two TMTA ligands in a distorted anti-prismatic complex. The zinc atom displays a trigonal planar coordination with Zn-C bond lengths of 207 pm to the 2,2,4,4,6,6-hexamethyl-2,4,6-trisila-cyc/o-hexyl ligands and of 202 pm to the methyl group. One trisila-cyc/o-hexyl substi tuent exists in the chair, the other one in the twist conformation. The reaction of lithium bis(trimethylsilyl)amide with bis(trimethylsilylmethyl)zinc yields the benzene soluble lithium-bis(trimethylsilyl)amino-bis(trimethylsilylmethyl)zincate TMTA. The molecular structure was confirmed by X-ray diffraction (P212121; a -1024,8(3); b = 1775,4(7), c = 1918,2(8) pm; Z = 4). The bridging bis(trimethylsilyl)amino ligand displays long Zn-N and Li-N distances of 213 and 208 pm, respectively, due to the steric inter-ligand repulsion. During the reaction of lithium bis(trimethylsilyl)amide with bis[bis(trimethylsilyl)methyl]-zinc no zincate formations observed. The decomposition products lithium bis(trimethylsilyl)-methanide and the heteroleptic bis(trimethylsilyl)amino-bis(trimethylsilyl)methylzinc were detected.

Chiba, Atsushi. "Crystal Orientation and Surface Morphology of Sono-Electroplated Zinc Film from Alkali Zincate Bath". Advanced Materials Research 79-82 (agosto 2009): 1743–46. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1743.

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Zn plated on Cu plate from 0.65 mol/dm3 alkali zincate solution in 8 mol/dm3 KOH bath Electrolysis was carried out as current density of 10 - 100 mA/cm2. The sonication was prepared 40 kHz. The current efficiency was 76.1 % at 10 mA/cm2 in 0.10 mol/dm3 zincate and 100 % in 0.15 mol/dm3 zincate at 50 mA/cm2. The current efficiency and thickness of diffusion layer affected with the agitation of micro-jet. Surface of film was smooth and dense as particle crushed down with the shockwave pressure. (112) plane moved horizontally to <113> direction under the compressive stress or shearing stress.

Sun, Qi Lei, e Ze Rui Liu. "Electrochemical Behaviors of Q420 Hot Galvanized Plate in Simulated Concrete Pore Solution". Advanced Materials Research 941-944 (giugno 2014): 854–57. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.854.

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The electrochemical behaviors of Q420 hot galvanized plate in the simulated concrete pore solution are studied by means of polarization curves and AC impedance. The result shows that, when the Q420 galvanized plate is in the simulated concrete pore solution, the stable and protective calcium zincate grains can be produced on the coating surface of the galvanized steel, so that the coating can enter the passive state and prevent the further corrosion of zinc in the alkaline environment. When the carbonification occurring in the concrete reduces the pH of medium or changes the medium environment due to the intrusion of Cl-, some small corrosion pores occur at the grain boundary of zinc grain first, then the calcium zincate grain Ca [Zn (OH)3]2·2H2O begins to be produced near the small pores, and with the gradual growth of calcium zincate grain, the zinc layer surface is gradually coated to form the protective layer with gradually increasing corrosion resistance. After the zinc base is fully coated by the calcium zincate grain, the corrosion current density declines to about the critical passive value, and the zinc layer is in the passive state. When Cl- enters the corrosive concrete environment, Cl- will destroy the primary corrosion product film calcium zincate covering the galvanized coating, so that the galvanized coating can enter the active state again.

Bikulčius, Gedvidas, Sigitas Jankauskas, Aušra Selskienė, Laurynas Staišiūnas, Tadas Matijošius e Svajus Joseph Asadauskas. "New Insight into Adherence of Ni-P Electroless Deposited Coatings on AA6061 Alloy through Al2O3 Ceramic". Coatings 12, n. 5 (26 aprile 2022): 594. http://dx.doi.org/10.3390/coatings12050594.

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The adhesion quality of Ni-P coatings on aluminum is important for mechanical and anticorrosion properties. In this study, the adhesion of Ni-P coatings on nanoporous Al2O3 ceramic (NAC) was evaluated by impact testing. NAC was fabricated on AA6061 alloy by anodizing in sulfuric acid. The deposition of Ni-P coating was carried out on NAC with and without zincate pretreatment. It was found that zincate activation of Al2O3 accelerates the formation of Ni-P coating. A cross-sectional analysis using energy-dispersive X-ray spectroscopy showed that the mechanical properties and impact resistance of the Ni-P coating are strongly related to the chemical composition in the vicinity of its interface with Al2O3. The course of the formation process of Ni-P coating and its mechanisms are also very important. Although the formation of Ni-P coating was slower without zincate treatment, its stronger adhesion to NAC led to superior impact resistance compared to zincate-treated Al2O3. Improved durability of items with Ni-P coatings can benefit many applications.

Li, Song, e Yuan Yuan Zhou. "Preparation of Tetragonal and Hexagonal Calcium Zincate". Applied Mechanics and Materials 130-134 (ottobre 2011): 1454–57. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1454.

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Tetragonal and hexagonal calcium zincate as an active material in Zn/Ni secondary battery has been successfully prepared with precipitation transformation method by isothermal in the reasonable concentration of KOH as base solution for the first time. The chemical composition of Ca [Zn (OH)3]2•2H2O was confirmed by X-ray powder diffraction pattern 、TG-DSC and infrared spectroscopy. These results all show that perfect crystal shape of either regular tetragonal or hexagonal calcium zincate (regardless of crystal size) should always have the same chemical expression of Ca [Zn (OH)3]2•2H2O as its form; and incomplete crystal shape of calcium zincate prepared in different conditions , their chemical expression may be the form of Ca [Zn (OH)3]2•nH2O(n=1~2).

KAWASHIMA, Satoshi. "Zincate Process of Aluminum". Journal of The Surface Finishing Society of Japan 64, n. 12 (2013): 645–49. http://dx.doi.org/10.4139/sfj.64.645.

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AZUMI, Kazuhisa, Takuma YUGIRI, Masahiro SEO, Katsuhiko TASHIRO e Satoshi KAWASHIMA. "Double Zincate Pretreatment of Al Alloy in a LiOH-based Zincate Solution." Journal of the Surface Finishing Society of Japan 51, n. 3 (2000): 313–18. http://dx.doi.org/10.4139/sfj.51.313.

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Tong, Meng Liang, e Xuan Yan Liu. "Preparation and Electrochemical Performances of Calcium Zincate Synthesized by Microwave Method". Advanced Materials Research 236-238 (maggio 2011): 868–71. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.868.

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Calcium zincate as an active material in Zn/Ni secondary battery has been successfully synthesized by microwave method. The chemical composition of Ca(OH)2·2Zn(OH)2·2H2O was confirmed by X-ray powder diffraction pattern and weight loss in thermogravimetric analysis.The results of cyclic voltammetry and experimental Zn/Ni battery charge–discharge test showed that the material of calcium zincate had excellent electrochemical performances: a high discharging platform of 1.685 V and a good cycleability, discharge capacity would be 70.0% of initial capacity after circulated 120 times.

Tsehaye, Misgina Tilahun, Getachew Teklay Gebreslassie, Nak Heon Choi, Diego Milian, Vincent Martin, Peter Fischer, Jens Tübke et al. "Pristine and Modified Porous Membranes for Zinc Slurry–Air Flow Battery". Molecules 26, n. 13 (2 luglio 2021): 4062. http://dx.doi.org/10.3390/molecules26134062.

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The membrane is a crucial component of Zn slurry–air flow battery since it provides ionic conductivity between the electrodes while avoiding the mixing of the two compartments. Herein, six commercial membranes (Cellophane™ 350PØØ, Zirfon®, Fumatech® PBI, Celgard® 3501, 3401 and 5550) were first characterized in terms of electrolyte uptake, ion conductivity and zincate ion crossover, and tested in Zn slurry–air flow battery. The peak power density of the battery employing the membranes was found to depend on the in-situ cell resistance. Among them, the cell using Celgard® 3501 membrane, with in-situ area resistance of 2 Ω cm2 at room temperature displayed the highest peak power density (90 mW cm−2). However, due to the porous nature of most of these membranes, a significant crossover of zincate ions was observed. To address this issue, an ion-selective ionomer containing modified poly(phenylene oxide) (PPO) and N-spirocyclic quaternary ammonium monomer was coated on a Celgard® 3501 membrane and crosslinked via UV irradiation (PPO-3.45 + 3501). Moreover, commercial FAA-3 solutions (FAA, Fumatech) were coated for comparison purpose. The successful impregnation of the membrane with the anion-exchange polymers was confirmed by SEM, FTIR and Hg porosimetry. The PPO-3.45 + 3501 membrane exhibited 18 times lower zincate ions crossover compared to that of the pristine membrane (5.2 × 10−13 vs. 9.2 × 10−12 m2 s−1). With low zincate ions crossover and a peak power density of 66 mW cm−2, the prepared membrane is a suitable candidate for rechargeable Zn slurry–air flow batteries.

Più fonti

Tesi sul tema "Zincate":

Baillie, Sharon E. "Novel synthetic and structural advances in magnesiate and zincate chemistry". Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18668.

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Building on recent successes in mixed-metal chemistry, this research project aims to enhance the understanding of the complicated correlations existing between structural patterns and reactivities of alkali metal magnesiates and zincates together with exploring their applications in a number of fundamental organic transformation reactions such as metallation, alkyl addition and metal-halogen exchange reactions. Elucidating the effect that donor solvents can exert on the overall constitution of organometallic reagents, a series of novel solvated [(donor)MMgR3] and [(donor)2M2MgR4] (donor = THF, dioxane, TMEDA, PMDETA; M = Li, Na, K; R = CH2SiMe3) compounds have been prepared and fully characterised both in the solidstate and in solution using multinuclear NMR (including 1H-DOSY NMR) studies. A rich variety of structural motifs has been disclosed which range from simple monomers when polydentate ligands such as PMDETA are employed, such as [(PMDETA)LiMgR3] (6) and [(PMDETA )2MMgR4] (M = Na (9), K (11)), to much more complex polymeric structures using oxygen donor ligands dioxane or THF, such as [{(dioxane)2LiMgR3}8] (3), [{(dioxane)Li2Mg2R6}8] (4) and [{(THF)LiMgR3}8] (2). The first examples of unsolvated trisalkyl magnesiates [{NaMgR3}8] (12) and [{KMgR3}8] (16) have been unveiled which exhibit distinct 2D supramolecular structures in the solid-state constructed exclusively of electron deficient M-C bonds. The ability of novel potassium magnesiates to participate in direct magnesium-hydrogen exchange reactions was assessed with several aromatic and heteroaromatic substrates. In addition, key reaction intermediates have been structurally defined from metallation, alkyl addition and metal-halogen exchange reactions which provide compelling evidence that the outcome of these reactions are reliant on subtle changes in the coordination sphere of the bimetallic reagent employed. Thus, the reactivity of heteroleptic zincate [(T HF)LiZn(TMP)(tBu)2] (22) towards pyrazine has demonstrated that despite the presence of two nucleophilic tBu groups the selective two-fold deprotonation of the heterocycle pyrazine is preferred to form the unprecedented 2,5-di-zincated pyrazine molecule. These results are in contrast with those observed when pyrazine is confronted by the homoleptic alkyl zincate [(PMDETA)LiZn(tBu)3] (23) where the chemoselective addition of a tBu group to the (Sa(B-C of the heterocycle takes place under mild reaction conditions. Focussing on metal-halogen exchange reactions, the addition of LiOtBu has proved to greatly activate ZnEt2 towards zinc-iodine exchange reactions with 2-iodoanisole under mild conditions. Novel bimetallic approaches which allow the selective C4 functionalisation of unsaturated N-heterocyclic carbene IPr have been developed. Thus, the first direct zincation of an NHC was achieved by reacting sodium zincate [(TMEDA)Na(TMP)(tBu)Zn(tBu)] with IPr to form [(THF)3Na(IPr *)Zn(tBu)2] (41). 41 exhibits a unique chemical profile and can react efficiently with [ClAu(PPh3)] to form an unprecedented bis-gold [ClAu(IPr*)Au(PPh3)] (47) species. Extension of these reactivity studies to Na/Mg combinations allows the isolation of the first sodium magnesiate containing a deprotonated carbene molecule [(THF)3Na(IPr*)Mg(CH2SiMe3)2(THF)] (50).

Chohan, Zahid H. "Co-ordination chemistry of the 1,3-dithiole-2-thione (DMIT) and 2-one-4,5-dithiolato (DMIO) compounds". Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244990.

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Various bis-dmio and -dmit zincate complexes, [Q]₂[Zn(dmio)₂] [Q = NEt₄, 1,4-dmp, Ph₄P and FcCH₂NMe₃] and [Q]₂[Zn(dmit)₂] [Q = FcCH₂NMe₃], have been prepared and characterised by IR, ¹H and ¹³C-NMR spectral and elemental analysis data. The solid state structure of [FcCH₂NMe₃]₂[Zn(dmio)₂] was determined by X-ray crystallography. The complexes, [Q]₂[Zn(dmio)₂] and [Q]₂[Zn(dmit)₂], have been further used as precursors of various dmio and dmit complexes of tin (IV) and antimony (III) and (V). Metal exchange reactions with these complexes have also been investigated. The neutral tin compounds, R₂Sn(dmio) [RR' = Me₂, Et₂, Bu₂, Ph₂ and MeO₂CH₂CH₂] have been synthesised and characterised by IR, ¹H, ¹³C and ¹¹⁹Sn-NMR spectral and elemental analysis data and for Me₂Sn(dmio) by X-ray diffraction. The compounds, [Q][R₂Sn(dmio)X] [Q = NEt₄, FcCH₂NMe₃ ; R = Ph, Et ; X = Cl] and [Q][R₂(dmit)X] [Q = FcCH₂NMe₃ ; R = Ph ; X = Cl], have been prepared and halide (X) exchange reactions in [Q][R₂Sn(dmio)X] [Q = NEt₄ ; R=Ph ; X=Cl] have been investigated using alkali metal halides and pseudohalides [NaI, NaBr and NaSCN]. The solid state structures of [NEt₄][Ph₂Sn(dmio)Cl], [NEt₄][Ph₂Sn(dmio)-SCN] and [NEt₄][NEt₄][Et₂Sn(dmio)Br] have been determined. The monoestertin bis-dmio complexes, [Q][MeO₂CCH₂CH₂Sn(dmio)₂] [Q = NEt₄, 1,4-dmp and Ph₄P] and the neutral diestertin dmio complex, [(MeO₂CCH₂CH₂)_2-Sn(dmio)], have been synthesised and characterised. The solid state structure of [NEt₄][MeO₂CCH₂CH₂Sn(dmio)₂] has been determined. Also, the tris-dmio and dmit complexes, [Q]₂[Sn(dmit)₃] [Q = NEt₄, 1,4-dmp, Ph₄P and FcCH₂NME₃] and [Q][Sn(dmit)₃] [Q = FcCH₂NMe₃] have been prepared and characterised. The antimony (III) bis-dmio complexes, [Q][Sb^III(dmio)₂] [Q = NEt₄, 1,4-dmp, Ph₄P and FcCH₂NMe₃], and antimony (III) bis-dmit complex, [Q][Sb^III(dmio)₂] [Q = FcCH₂NMe₃], have been synthesised and fully characterised by IR, ¹H and ¹³C-NMR spectral and elemental analysis data.

Herd, Emma. "Alkali metal zincate chemistry : the importance of structure and stoichiometry on reactivity". Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24356.

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Focusing on the area of cooperative bimetallic reagents, this report aims to advance our understanding on the construction and reactivity of alkali metal zincates. Extending previous studies on the synthesis of dialkyl(amido)zincates, unsolvated lithium zincate [LiZn(HMDS)Me₂] 4a was prepared by a cocomplexation approach, and its interaction with a range of Lewis basic solvents of varying denticity was examined. The effect of these donors on constitution and stability was assessed, resulting in the determination of a novel dialkyl(amido)zincate, [(PMDETA)LiZn(HMDS)Me₂] 5, containing an unusual terminal amido ligand. The influence of the amido group in these mixed-metal systems was also studied. Using the amide [NHDipp]⁻, a new family of lithium zincates has been synthesised, leading to the characterisation of the first dialkyl(amido)zincates based on a primary amide - [(PMDETA)LiZn(NHDipp)Me₂] 10 and [(THF)₃LiZn(NHDipp)(Me)₂] 11. X-ray crystallographic studies evidenced that, depending on the donor solvent employed, novel zincate formulations can be accomplished - as demonstrated by the isolation of the unprecedented zinc-rich zincate [LiZn₂(NHDipp)₂(Me)₃(THF)₃] 12, containing an unusual 2:1 zinc to lithium ratio. By synthesising the homoaryl lithium zincates [LiZnPh₃] 15 and [Li₂ZnPh₄] 16, and investigating their reactivity towards several electron-deficient N-heterocycles, a new transition metal free method enabling the efficient, regioselective arylation of acridine has been developed. Isolation of key reaction intermediates such as [(THF)₃Li(NC₁₃H₉-9-Ph)] 17, has provided important clues as to how these bimetallic systems operate. The reactivity of trimetallic mixtures based on [Zn(OPiv)₂·2LiCl] 27 and ArMgCl towards N-heterocyclic molecules was also investigated. Although unreactive towards arylation, new light has been shed on the constitution, reactivity and stability of these multi-component reagents. Finally, the bulky bis(amido)silyl ligand [Ph₂Si(NDipp)²⁻] has been successfully incorporated into two novel zincates, [{Na(THF)₆}+{(Ph₂Si(NDipp)₂)ZnEt}⁻] 29 and [(Ph₂Si(NDipp)₂)Zn(TMP)Na(THF)] 30, which have been employed in the regioselective zincation of benzothiazole and pyrrole, yielding the novel compounds [Na(THF)₂Zn(Btz)₃]₂ 31 and [Na₂(THF)₄Zn(NC₄H₄)₄]∞ 32.

Balloch, Liam. "Towards understanding synergic s-block chemistry : new insights from zincate and magnesiate reactions". Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=17205.

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Robertson, Sherryl G. "The zincate immersion process for plating aluminium: A kinetic, electrochemical and morphological study". Thesis, Robertson, Sherryl, G. (1995) The zincate immersion process for plating aluminium: A kinetic, electrochemical and morphological study. PhD thesis, Murdoch University, 1995. https://researchrepository.murdoch.edu.au/id/eprint/52750/.

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The zincate immersion process is used commercially to treat aluminium prior to electroplating. The aluminium is immersed into an alkaline zincate solution where the oxide layer is dissolved. An intermediate zinc coating is then formed on the surface through displacement. Despite having been used commercially for many decades, the process still experiences a number of problems. The reaction has been studied previously, but no one has yet taken advantage of the fact that the zincate immersion process is a cementation reaction, and a large body of knowledge exists on how to determine the mechanism of these types of reactions. This thesis presents such a study. In the first part of this thesis, the results from a detailed investigation of the kinetics of the cementation of zinc by aluminium from an alkaline zincate solution are presented. The concentration of zincate ions was found to have a substantial effect on the nature of the reaction. At low zincate concentrations (0.01 M) the reaction was diffusion controlled, while at high concentrations (0.5 M) the reaction was chemically controlled. The rotation rate, sodium hydroxide concentration and temperature were also found to be of significance. The effect of changing the experimental parameters on the reaction could be interpreted using appropriate Evans’ diagrams (i.e. superimposed polarization diagrams for the reduction of zincate and the anodic oxidation of aluminium). Mixed potentials, recorded as a function of time under the various experimental conditions, provided complementary information. The morphology of the zinc deposits formed ranged from being spongy, non-adhesive and non-cohesive to being thin, flat, adhesive and cohesive. Again, the changes in morphology could be rationalized through the use of Evans’ diagrams. The final part of this thesis presents a detailed study of one of the more common modifications to the zincate immersion process used industrially. This is the addition of ferric chloride, complexed with potassium sodium tartrate, to the zincate solution. The effect of this addition was investigated using the same techniques as above. It was concluded that the ferric chloride acts by oxidizing the edges of the zinc crystals, thereby inhibiting their formation and growth and resulting in the deposition of a more compact coating. Tartrate was found to have no purpose other than as a complexing agent for Fe(III). Alternative additives were explored.

ZIPPERIAN, DONALD CHARLES. "PHYSICAL AND CHEMICAL CHARACTERISTICS OF THE ZINCATE IMMERSION PROCESS FOR ALUMINUM AND ALUMINUM ALLOYS". Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184123.

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A detailed experimental study has been carried out to investigate the zincate immersion deposition process for 99.99%, 6061, and 356-T6 aluminum samples. In particular, the effect of iron and tartrate in the immersion bath, the aluminum surface preparation, and the relationship of the first immersion step to the second immersion step were investigated by chemical, electrochemical (polarization and rest potentials), and surface analytical scanning electron microscopy (SEM), transmission electron microscopy (TEM), Rutherford backscattering spectrometry (RBS), X-ray photoelectron spectroscopy (XPS), and Auger electron spectroscopy (AES) techniques. Eh-pH diagrams were constructed to determine the most stable zinc, iron, and aluminum species in solution. These diagrams predict that ferrous and ferric ions, as well as aluminum should form stable complexes with tartrate at the typical immersion deposition conditions (Eh -0.9 to -1.0 and pH 14 to 15). Experimentally, tartrate was found to enhance the dissolution rate of aluminum in highly caustic solutions. The addition of ferric chloride to the immersion bath produced coatings that were more crystalline, and also decreased the amount of hydrogen gas evolved in the second immersion step. The deposition of zinc and iron during the second immersion step was considerably less than that during the first immersion step. The second immersion coating became more adherent as the initial surface roughness decreased, and as grain size was increased the second immersion coating became thicker. For increasing grain size the micrographs for the first and second immersion coatings showed that the coatings became more localized. The second immersion coating thickness and morphology were also dependent upon several first immersion variables, such as bath temperature, immersion time and bath composition. Increased dissolution rates of aluminum in the first immersion produced thinner coatings with a finer crystallite growth. Increased bath temperature and increased first immersion time enhanced the dissolution rate of aluminum. The zinc coating slowed the dissolution rate of aluminum. When zinc was absent from the first immersion bath, the aluminum dissolution was much faster and resulted in thinner coatings upon subsequent second immersion. The molar ratio of zinc deposited to aluminum dissolved was a constant value of 1.1 for both first and second immersions; the molar ratio was also constant for the different aluminum substrates examined in this investigation.

Garden, Jennifer Anne. "Advances in synthetic, structural and reaction chemistry of zinc and zincate complexes containing alkyl and/or amido ligands". Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23171.

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Segale, Allan Davide. "Effetto del frenafiletti sul coefficiente d'attrito al serraggio in viti brunite". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Ad oggi, l'utilizzo dei collegamenti filettati nel campo delle costruzioni meccaniche è ancora piuttosto diffuso, favorito soprattutto dalla possibilità di avere a disposizione dei collegamenti particolarmente resistenti in condizioni operative e facilmente smontabili per operazioni di ispezione o manutenzione. Questa peculiare caratteristica, sfruttata in particolare anche in campo automobilistico, ha spinto nel corso degli anni la ricerca tecnico-scientifica ad indagare sempre meglio le proprietà di questi collegamenti, soprattutto per quanto riguarda le questioni legate all'attrito, di importanza fondamentale per la corretta messa in opera dei collegamenti filettati. Il presente studio ha lo scopo di coprire un'area grigia, non ancora del tutto esplorata, che tratta del comportamento tribologico di adesivi anaerobici (frenafiletti) applicati alle filettature, per operazioni di serraggio. In particolare, sulla base di procedure standard attualmente in uso presso i costruttori automobilistici, si è impostato un piano degli esperimenti per la valutazione degli effetti, in termini tribologici, delle variazioni di parametri legati alle operazioni di serraggio effettuate su collegamenti con viti brunite. I risultati, di particolare rilevanza ed utilità nel caso delle procedure industriali, mettono in evidenza alcuni comportamenti, talvolta inaspettati soprattutto per quanto riguarda l'effetto lubrificante reso dai frenafiletti.

Pierret, Alexandre. "Fonctionnalisation à distance par métallotropie de dérivés benzyliques". Electronic Thesis or Diss., Université de Lorraine, 2023. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2023_0032_PIERRET.pdf.

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Cette thèse présente un développement de la réaction de fonctionnalisation à distance par réarrangement métallotropique sur des dérivés benzyliques. Le travail repose sur l’utilisation d’un unique réactif métallique, un triorganozincate de lithium, lequel permet la formation de deux liaisons C(sp3)-C(sp2) et C(sp3)-C(sp3) sur des sites distants de 5 atomes en une seule opération. Le premier chapitre se focalise sur les dérivés benzyliques iodés en position 4 du cycle aromatique. Des conditions réactionnelles inédites basées sur l’utilisation d’un solvant biosourcé sont proposées. Elles permettent d’atteindre une portée synthétique sans précédent pour une telle réaction à partir de ces substrats. L’influence du solvant est discutée. Le deuxième chapitre est consacré à l’étude mécanistique par DFT de chacune des étapes composant la séquence réactionnelle étudiée précédemment. Ainsi, l’échange halogène/métal, la migration-1,2 de ligand ou encore le réarrangement métallotropique sont investigués avec prise en compte minutieuse du solvant de prédilection de la réaction. Un apport expérimental vient compléter cette étude. Enfin, l’extension de cette transformation aux dérivés hétéroaromatiques benzyliques, en particulier les thiophènes, est l’objet de l’ultime chapitre de cette thèse. Les travaux rapportés définissent une approche de fonctionnalisation à distance où une même boîte à outils, composée d’une plateforme unique (thiophène halogéné porteur d’un phosphate benzylique) et d’un réactif organométallique de même nature (organozincate de lithium), offre plusieurs opportunités synthétiques selon les désirs de l’expérimentateur
This thesis presents a development of the remote functionalization reaction by metallotropic rearrangement on benzyl derivatives. The work is based on the use of a single metal reagent, a lithium triorganozincate, which allows the formation of two bonds C(sp3)-C(sp2) and C(sp3)-C(sp3) on sites 5 atoms apart in a single operation. The first chapter focuses on benzyl derivatives with an iodine in position 4 of the aromatic ring. Novel reaction conditions based on the use of a bio-based solvent are proposed. They allow to reach an unprecedented synthetic scope for such a reaction from these substrates. The influence of the solvent is also discussed. The second chapter is devoted to the mechanistic study by DFT of each step composing the reaction sequence studied previously. Thus, the halogen/metal exchange, the 1,2-migration of ligand or the metallotropic rearrangement are investigated with careful consideration of the solvent of the reaction. An experimental contribution completes this study. Finally, the extension of this transformation to benzylic heteroaromatic derivatives, in particular thiophenes, is the subject of the last chapter of this thesis. The reported work defines an approach of remote functionalization where a same toolbox, composed of a unique platform (halogenated thiophene bearing a benzyl phosphate) and an organometallic reagent of the same nature (lithium organozincate), offers several synthetic opportunities according to the experimenter's desires

Chaumont-Olive, Pauline. "Synthèse et développement de la réactivité des triorganozincates de lithium chiraux en addition nucléophile énantiosélective et application à la synthèse de produits bioactifs". Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR069/document.

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Le développement de méthodes de synthèse asymétriques a largement été exploré au cours des vingt dernières années et en particulier par le biais de réactifs organométalliques. Bien que ces processus mènent à d’excellents résultats en terme d’énantiodiscrimination, l’objectif de cette thèse a été de développer de nouveaux outils de synthèse peu onéreux, respectueux des fonctions sensibles environantes et permettant l’accès aux composés attendus avec de bons rendements et excès énantiomériques. Dans cet optique, des triorganozincates de lithium chiraux ont été étudiés. Des méthodes d’alkylation et d’arylation 1,2 énantiosélectives d’aldéhydes, comportant comme partenaire chiral la (R)-N-(2-iso-butoxybenzyl)-1- phenyléthanamine, ont ainsi été développées et mises en application sur divers aldéhydes. Les alcools secondaires correspondants ont été obtenus avec de bons rendements (jusqu'à 83%) et d’excellents excès énantiomériques (jusqu'à 99%). Ces procédures ont ensuite été appliquées à la synthèse asymétrique de produits naturels et/ou bioactifs tels que la Spiromastilactone A, la (R)-Néobénodine et la (R)-Orphénadrine. Par ailleurs, la synthèse de nouveaux ligands de type amino-alcool a été développée dans le but ultime de désymétriser des substrats de type imines cycliques
The development of new asymetric methodologies have been widely explored during the last twenty years and in particular through organometallic reagents. Although these processes lead to excellent results in terms of enantiodiscrimination, the goal of this thesis was to develop new tools: cheap, chemoselective and allowing the access to the desired compounds with high yields and enantiomeric excesses. In this context, chiral lithium triorganozincates have been studied. Enantioselective nucleophilic 1,2 alkylation and arylation of aldehydes reactions, including (R)-N-(2-iso-butoxybenzyl)-1-phenylethanamine as the chiral ligand, have been optimized toward various aldehydes. The expected secondary chiral alcohols have been obtained with good yields (up to 83%) and high enantiomeric excesses (up to 99%).These processes have been then applied to the asymmetric synthesis of naturals and/or bioactive compounds as Spiromastilactone A, (R)-Neobenodine and (R)-Orphenadrine. Finally, the access to new amino-alcohols have been developed with the ultimate goal to engage those species as the chiral partner when reacting chiral lithium zincates with imines

Più fonti

Libri sul tema "Zincate":

Bapîr, ʻElî. Zincîre dersî îman u ʻeqîdey Îslamî leber r̄oşnayî Quran u Sunnetda. Hewlêr [Kurdistan, Iraq]: al-Tafsīr bo Biławkirdinewe w Rageyandin, 2006.

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Borrow, George Henry. The Zincali, or, An account of the gypsies of Spain: With an original collection of their songs and poetry, and a copious dictionary of their language. Mairena del Aljarafe, Sevilla: Extramuros Edición, 2007.

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Zincke, Herbert. Mitsui madhouse: Memoir of a U.S. Army Air Corps POW in World War II. Jefferson, N.C: McFarland & Co., 2003.

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Wang, Rainey Yu. The morphology study of zinc electrodeposits from alkaline zincate solutions. 2006.

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Borrow, George Henry. Zincali. Barnes & Noble, Incorporated, 2011.

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Borrow, George. Zincali. Independently Published, 2021.

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Borrow, George Henry. Zincali: Special Edition. Independently Published, 2021.

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Aiskhylos. Zincire Vurulmus Prometheus. Is Bankasi Kültür Yayinlari, 2013.

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Norman, Roger. Zincap Bir Dostluk Hikâyesi. Yapi Kredi Yayinlari, 2015.

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Aiskhylos. Zincire Vurulmus Prometheus - Hasan Ali Yücel Klasikleri. Is Bankasi Kültür Yayinlari, 2013.

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Capitoli di libri sul tema "Zincate":

Scott, Margaret, e Michael Moats. "Optimizing Additive Ratios in Alkaline Zincate Electrodeposition". In The Minerals, Metals & Materials Series, 123–31. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37070-1_11.

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Uchiyama, Masanobu, e Chao Wang. "New Formulas for Zincate Chemistry: Synergistic Effect and Synthetic Applications of Hetero-bimetal Ate Complexes". In Organo-di-Metallic Compounds (or Reagents), 159–202. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/3418_2013_72.

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Murakami, Kouji, Makoto Hino, Minoru Hiramatsu, Kozo Osamura e Teruto Kanadani. "Influence of Zincate Treatment on Adhesion Strength of Electroless Nickel-Phosphorus Plated Film for Commercial Pure Aluminium". In Materials Science Forum, 759–64. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-408-1.759.

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Li, Jie Jack. "Zincke reaction". In Name Reactions, 451–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05336-2_330.

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Li, Jie Jack. "Zincke reaction". In Name Reactions, 656–58. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03979-4_299.

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Li, Jie Jack. "Zincke reaction". In Name Reactions, 596–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01053-8_277.

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Wang, Yong, e Ya’nan Yan. "Study on Performances of the Concrete Pavement from Zincilate". In Springer Geochemistry/Mineralogy, 365–71. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13948-7_37.

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"zincate, n." In Oxford English Dictionary. 3^a ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/7241449637.

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Boobalan, S., G. Sivasankari e M. Mahaveer Sree Jayan. "Computational EPR and Optical Spectral Investigation of VO(II) Ion Doped in Aqualithiumaquabis (Malonato) Zincate Lattice". In Marvels of Artificial and Computational Intelligence in Life Sciences, 197–214. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136807123010017.

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Abstract (sommario):

Electron Paramagnetic Resonance studies are carried out at room temperature on single crystals of aqualithiumaquabis (malonato) zincate doped with VO(II) using X-band frequencies. Rotations in three mutually orthogonal planes indicate three chemically inequivalent sites, with intensities ratios of 1:2:9. However, only one site, with the highest intensity, could be followed during crystal rotations. The calculated spin Hamiltonian parameters are: gxx=1.976; gyy=1.973; gzz=1.933; Axx= 7.01 mT; Ayy= 6.77 mT; Azz= 18.01 mT. The impurity has entered the lattice in an interstitial position. The analysis of the powder spectrum also reveals the presence of only one site. Admixture coefficients, Fermi contact and dipolar interaction terms have also been evaluated. IR, UV-Visible and powder XRD data of the doped complex confirm the structure and symmetry of the host lattice.

Hemeon, I., e R. D. Singer. "Dialkyl(triorganosilyl)zincate Reagents from an Alkylmetal, Triorganosilylmetal Reagents, and Zinc(II) Salts". In Compounds of Groups 15 (As, Sb, Bi) and Silicon Compounds, 1. Georg Thieme Verlag KG, 2002. http://dx.doi.org/10.1055/sos-sd-004-00258.

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Atti di convegni sul tema "Zincate":

Gan, Weixing, Ming Li e Tao Hang. "Effect of zincate immersion pretreatment on corrosion resistance of electroless plated nickel-phosphorus film for advanced packaging". In 2018 19th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2018. http://dx.doi.org/10.1109/icept.2018.8480536.

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Boopathi, K., S. Moorthy Babu e P. Ramasamy. "Synthesis, crystal structure, thermal and nonlinear optical properties of new metal-organic single crystal: Tetrabromo (piperazinium) zincate (II) (TBPZ)". In DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5028979.

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Yang, Patrick, Damon Turney, Mike Nyce, Timothy Lambert, Stephen O'Brien e Sanjoy Banerjee. "Investigating the Impact of Adding Metallic Zinc to Calcium Zincate Anodes for Improved Performance in Rechargeable Alkaline Zinc Batteries." In Proposed for presentation at the 2022 DOE OE Peer Review held October 11-13, 2022 in Albuquerque, NM. US DOE, 2022. http://dx.doi.org/10.2172/2005274.

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Yang, Patrick, Damon Turney, Mike Nyce, Timothy Lambert, Stephen O'Brien e Sanjoy Banerjee. "Investigating the Impact of Adding Metallic Zinc to Calcium Zincate Anodes for Improved Performance in Rechargeable Alkaline Zinc Batteries." In Proposed for presentation at the AiChE held November 13-18, 2022 in Phoenix, AZ. US DOE, 2022. http://dx.doi.org/10.2172/2005909.

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Silva, Alexsandro Marcio da, Bruno Tonioni Cunha, Chrysler F. Peres Guimarães, Eri Elias de Souza Junior, Felipe Martins da Silva e Lucio Oliveira Magalhães. "GESTÃO DE INDICADORES DE DESEMPENHO EM TEMPO REAL APLICADOS A LAMINAÇÃO, ZINCAGEM E FOLHAS METÁLICAS". In 18º Seminário de Automação e TI. São Paulo: Editora Blucher, 2014. http://dx.doi.org/10.5151/2237-0234-25512.

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Holcomb, G. R., S. J. Bullard, B. S. Covino, S. D. Cramer, C. B. Cryer e G. E. McGill. "Electrochemical Aging of Thermal Sprayed Zinc Anodes on Concrete". In ITSC 1996, a cura di C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0185.

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Abstract Thermal-sprayed zinc anodes are used in impressed current cathodic protection systems for some of Oregon's coastal reinforced concrete bridges. Electrochemical aging of zinc anodes results in physical and chemical changes at the zinc-concrete interface. Concrete surfaces heated prior to thermal-spraying had initial adhesion strengths 80% higher than unheated surfaces. For electrochemical aging greater than 200 kC/m2 (5.2 A-h/ft2), there was no difference in adhesion strengths for zinc on preheated and unheated concrete. Adhesion strengths decreased monotonically after about 400 to 600 kC/m2 (10.4 to 15.6 A-h/ft2) as a result of the reaction zones at the zinc-concrete interface. A zone adjacent to the metallic zinc (and originally part of the zinc coating) was primarily zincite (ZnO), with minor constituents of wulfingite (Zn(OH)2), simonkolleite (Zn5(OH)8Cl2H20), and hydrated zinc hydroxide sulfates (Zn4S04(OH)5xH20). This zone is the locus for cohesive fracture when the zinc coating separates from the concrete during adhesion tests. Zinc ions substitute for calcium in the cement paste adjacent to the coating as the result of secondary mineralization. The initial estimate of the coating service life based on adhesion strength measurements in accelerated impressed current cathodic protection tests is about 27 years.

Costa, Alberto Nei Carvalho, José Eduardo Ribeiro de Carvalho, Fabiano Augusto Vallim Fonseca, Marcelo Pereira de Oliveira e Neilor da Silva Oliveira. "CARACTERIZAÇÃO DE AÇO ZINCADO PRÉ-FOSFATIZADO CSN PARA APLICAÇÃO EM ESTAMPAGEM DE PEÇAS CRÍTICAS NO SEGMENTO AUTOMOTIVO". In 51º Seminário de Laminação - Processos e Produtos Laminados e Revestidos - Internacional. São Paulo: Editora Blucher, 2014. http://dx.doi.org/10.5151/1983-4764-25706.

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Arêdes, Leiner Novaes, Marcelo Vilela Moreira e Kleidon Rodrigues de Almeida. "RETIRADA DA OBRIGATORIEDADE DE LAMINAÇÃO DE ACABAMENTO EM BQ DE MATERIAIS DO FLUXO LAMINADO A FRIO E ZINCADO DA CSN". In 51º Seminário de Laminação - Processos e Produtos Laminados e Revestidos - Internacional. São Paulo: Editora Blucher, 2014. http://dx.doi.org/10.5151/1983-4764-25549.

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Arêdes, Leiner Novaes, Augusto Cesar Lacerda de Oliveira e Carlaine Fonseca de Souza. "AUMENTO DA TAXA DE RESFRIAMENTO PÓS BOBINAMENTO DE BOBINA LAMINADA A QUENTE PARA OS FLUXOS DE LAMINAÇÃO A FRIO, RECOZIMENTO E ZINCAGEM NA CSN". In 51º Seminário de Laminação - Processos e Produtos Laminados e Revestidos - Internacional. São Paulo: Editora Blucher, 2014. http://dx.doi.org/10.5151/1983-4764-25547.

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Fernandes, Vinicius Santiago. "INFLUÊNCIA DOS PARÂMETROS DE SOLDAGEM POR COSTURA, EM AÇOS DE ALTA RESISTÊNCIA AVANÇADOS DAS CLASSES COMPLEX PHASE 1000 E 1200 DE UMA LINHA DE ZINCAGEM CONTÍNUA". In 20° Encontro Nacional de Estudantes de Engenharia Metalúrgica, de Materiais e de Minas (ENEMET). São Paulo: Editora Blucher, 2022. http://dx.doi.org/10.5151/2594-4711-34283.

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