Rozprawy doktorskie na temat „Sulphide corrosion”
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Coimbatore, Dhandayuth Venkatesh. "Cerium chloride inhibition for high strength low alloy steel exposed to sulphide polluted seawater". University of Western Australia. School of Mechanical Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0134.
Pełny tekst źródłaRuoru, Ke. "Pitting corrosion on sulphide inclusions in stainless steel 316". Thesis, University of Surrey, 1988. http://epubs.surrey.ac.uk/847585/.
Pełny tekst źródłaSutton, Jeremy. "Microbially influenced corrosion (MIC) of steels in mono- and hyper-baric environments". Thesis, Robert Gordon University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241029.
Pełny tekst źródłaNuttall, Robert Horan. "Aqueous hydrogen sulphide corrosion of iron, iron/chromium and iron/nickel alloys". Thesis, Robert Gordon University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358471.
Pełny tekst źródłaBALLESTEROS, ADRIANA FORERO. "EVALUATION OF THE RESISTANCE TO SULPHIDE STRESS CORROSION CRACKING AND HYDROGEN EMBRITTLEMENT OF API 5L -X80 GIRTH WELDS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32706@1.
Pełny tekst źródłaCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
BOLSA NOTA 10
A susceptibilidade à corrosão sob tensão em aços para dutos é dependente de uma série de eventos que vão desde a manufatura do aço, fabricação do tubo, montagem dos dutos e tipo de substância transportada pelo duto. O procedimento de soldagem envolvido na montagem dos dutos pode modificar as propriedades mecânicas do metal de base na região da zona termicamente afetada (ZTA), assim como as propriedades metalúrgicas e de resistência à corrosão, tornando potencialmente a região da junta soldada com maior probabilidade de incidência de corrosão sob tensão.Este trabalho tem como objetivo estudar a resistência à corrosão sob tensão em presença de sulfeto e fragilização pelo hidrogênio, em soldas circunferenciais de tubo API 5L X80. Foram realizados: -Ensaios de acordo com norma NACE TM0177/96, Método A -Ensaios de Baixa Taxa de Deformação (BTD) de acordo com a norma ASTM G129-00/2006, em solução contendo Tiossulfato de Sódio. Os resultados mostraram que o metal base foi considerado aprovado segundo os requisitos dos testes NACE TM0177/96. Porém as juntas soldadas originadas nos diferentes processos de soldagem estudados apresentaram susceptibilidade à corrosão sob tensão em presença de sulfeto e fragilização pelo hidrogênio, segundo o mesmo critério, fraturando em um período inferior a 720h. Esta susceptibilidade foi comprovada com os resultados dos ensaios de tração BTD, tendo sido constatada uma queda significativa no limite de resistência, alongamento e tempo de ruptura, em comparação aos ensaios realizados ao ar na mesma taxa de deformação. O mecanismo de fratura predominante nos ensaios foi fratura transgranular.
The susceptibility of pipeline steels to stress corrosion cracking (SCC) depends on a series of factors ranging from the manufacture of the steel, the pipe fabrication, the assembly of the pipeline and the type of substances to be transported. Additionally, the welding procedures adopted during the production of the tubes and for construction of the pipelines (field welding), can modify the properties of the base metal in the heat affected zone (HAZ), potentially rendering this region susceptible to sulphide stress corrosion cracking and hydrogen embrittlement.This study evaluates the resistance of girth welds in API 5LX80 pipes to hydrogen embrittlement and also to stress corrosion cracking in the presence of sulphides. The evaluation was performed according to NACE TM0177/96, Method A, applying the criterion of fracture/no fracture, and slow strain rate tensile tests (SSRT) were undertaken using a sodium thiosulphate solution according to the ASTM G29 standard. According to the requirements of the NACE TM0177/96 test, the base metal was considered approved. The weld metal exhibited susceptibility to SCC in the presence of sulphides, failling in a period of less than 720h. The susceptibility of the welded joint to SCC in the presence of sulphides was confirmed by the results obtained with SSRT tensile tests, where a significant decrease in the ultimate tensile strength, elongation and time to fracture were observed. The mechanism of fracture for the tests was predominantly transgranular.
Cortás, Laila de Castro. "Produção biogênica de sulfetos em amostras de água e óleo". Universidade do Estado do Rio de Janeiro, 2012. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3454.
Pełny tekst źródłaDuring off-shore oil recovery, seawater injection for secondary oil recovery, produces hydrogen sulphide (H2S), due to the presence of sulphate reducing bacteria (SRB), that reduces sulphate from seawater to sulphide. The massive production of H2S is presently one of the main problems in the petroleum industries, constituting one of the main causes of corrosion in production lines (dutes), equipments and tanks. The main microbial species found in this type of saline samples comes from water and oil storage tanks in the petroleum industry, being general anaerobic heterotrophic bacteria (GAHB) and sulphate reducing bacteria (SRB). Presently, the quantification of those microbial groups is made through a technique known as Most Probable Number (MPN). This quantification is obtained in around 28 days. In the present work a methodology based on the semi-continuous production of sulphide during 15 days was conducted, in an attempt to correlate these results with the quantification of GAHB and SRB cells through conventional MPN technique. In this case, the most suitable conditions for biogenic sulphide production in tanks, was studied through the evaluation of environmental parameters such as salinity, temperature and culture medium composition. It could be observed that an increase in salinity and temperature of the medium produced a marked decrease in the semi-continuous biogenic production of sulphide. In relation to the culture medium, its dilution promoted a decreased in cell growth, consequently in the production of sulphides. The quantification of SRB and GAHB was evaluated through the MPN technique, according to procedures suggested by FDA in 2011 and Harrigan in 1998. It was observed that this last procedure underestimated the microbial population, due to the lack of information about limits and standard deviations
Bourdoiseau, Jacques-André. "Rôle des espèces sulfures sur le comportement d’un acier non allié en milieu de stockage des déchets radioactifs de type C : interaction sulfures / produits de corrosion". Thesis, La Rochelle, 2011. http://www.theses.fr/2011LAROS328/document.
Pełny tekst źródłaThis PhD work deals with the nuclear waste disposal. In France, it is envisaged byAndra (French national radioactive waste management agency) that high-level radioactivewastes will be confined in a glass matrix, stored in a stainless steel canister, it self placed in a carbon steel overpack. The wastes will then be stored at a depth of ~500 m in a deep geological repositery, drilled in a very stiff (indurated) clay (argillite) formation. The kineticsof corrosion expected for the overpack in this disposal concept are low and will stay low if the somehow protective rust layer that will develop initially on the steel surface remains undamaged. Local changes of the physico-chemical conditions may however degrade this layer and induce accelerated kinetics of corrosion. In particular, the growth of sulphate reducing bacteria (SRB) close to the steel overpack cannot be excluded and the sulphid especies these micro-organisms produce may modify the corrosion process. The aim of this work was then to achieve a better understanding of the corrosion system constituted with steel, its rust layer mainly made of siderite FeCO3, and a sulphide-containing electrolyte.First, it proved necessary to characterise the iron sulphides involved in the corrosion processes by Raman micro-spectroscopy so as to study their formation and transformation mechanisms in various conditions of Fe(II) and S(-II) concentration, pH, temperature andaeration. It could be demonstrated that the Raman spectrum of mackinawite FeS, thecompound that precipitated in any case from dissolved Fe(II) and S(-II) species with the experimental conditions considered here, depended on the crystallinity and oxidation state.Moreover, the mechanisms of the oxidation of mackinawite into greigite Fe3S4 in acidicanoxic solutions at 80°C could be described. Finally, iron sulphides, often present on archaeological artefacts, could be identified using Raman micro-spectroscopy. The compounds present were mainly mackinawite and greigite.Secondly, to investigate the nature and properties of carbonated rust layers, carbonsteel electrodes were polarised anodically in NaHCO3 electrolytes continuously de-aerated byan argon flow. The experiments were performed at room temperature. The carbonated greenrust was observed to form at 0.003 and 0.1 mol L-1 NaHCO3 whereas FeCO3 was obtained atthe largest concentrations (0.5 and 1 mol L-1). Additional experiments were performed similarly in solutions of NaHCO3 and Na2SO4. Chukanovite, the Fe(II) hydroxycarbonate with formula Fe2(OH)2CO3, could be obtained in solutions containing 0.03 mol L-1 of eachsalt.Finally, interactions between sulphide species and corrosion products were studied.Siderite, goethite and lepidocrocite proved to be reactive towards sulphide. So, it seems clear that sulphide species produced by SRB should interact with the rust layer before to reach the metal underneath. Tests were performed with ferrous archaeological artefacts immersed 2months in anoxic sulphide-containing electrolytes to demonstrate it. The main effect of theimmersion was the formation of iron sulphide at the interface between the dense corrosion products layer, mainly constitute of siderite, and the transformed medium, where minerals ofthe soil are mixed with corrosion products. Sulphide species were not detected at the vicinityof the iron surface
De, Beer Deon Johan. "The relationship of weld metal hardness residual stress and susceptible to stress corrosion cracking in hydrogen sulphide environment in A516 Grade 70 carbon steel shielded metal arc welded joint". Diss., University of Pretoria, 2002. http://hdl.handle.net/2263/71679.
Pełny tekst źródłaDissertation (MEng)--University of Pretoria, 2017.
TM2019
Materials Science and Metallurgical Engineering
MEng
Unrestricted
Idriss, Ahmed. "Corrosive effect of hydrogen sulphide on cement mortar". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0018/NQ55626.pdf.
Pełny tekst źródłaHalsall, John Frederick. "The prevention of biological corrosion and fouling of metals : a study of corrosion processes and the electrochemical methods of controlling corrosion and fouling". Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318073.
Pełny tekst źródłaMontez, Gustavo Fabbri. "Produção biogênica de sulfetos por micro-organismos redutores de sulfato em amostras salinas da indústria do petróleo". Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8929.
Pełny tekst źródłaThe production of H2S (hydrogen sulfide) is a major problem in the oil industry, which is a cause of corrosion of pipes and storage tanks. This production is made possible due to seawater injection during the secondary oil recovery process where some microorganisms present in this water, such as total heterotrophic anaerobic bacteria (THAB) and sulphate-reducing bacteria (SRB) that promote reduction of sulfate to sulfide. Currently, the method of quantification of these microorganisms is the technique of the Most Probable Number (MPN) which estimates the results in about 28 days. The present study used the methodology of semi-continuous production of biogenic sulfide by 15 days period, in order to correlate with the measurements results of BANHT and BRS through the conventional technique of MPN. There were several samples analyzed from different origins in the oil industry, with variations in salinity from 0 to 16 g.L-1. The purpose of this procedure was to evaluate the specific speeds and instantaneous H2S production, suggesting thereby that samples had increased biogenic sulfide production and this production conditions which occurs. It was observed that all samples in the generation of H2S occurs incrementally until stabilization of this production, these being almost always obtained in six days (144h) of microbial growth. The production of biogenic sulfide occurred more intensely in the samples of oil storage tank bottom and formation water. The quantification of SRB and THAB were evaluated by the MPN method according to Harrigan table, which underestimates the microbial population, disregarding errors arising in the art
Rogers, Janette Louise. "Corrosion inhibition of aluminium alloys by molybdenum and tungsten sulphido species". Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303656.
Pełny tekst źródłaCheung, Chin Wa Sunny. "Biofilms of marine sulphate-reducing bacteria on mild steel". Thesis, University of Portsmouth, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241657.
Pełny tekst źródłaMcKenzie, Joann. "The involvement of sulphate-reducing bacteria in a heterogeneous marine laboratory model". Thesis, University of Aberdeen, 1988. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU027804.
Pełny tekst źródłaWatkins, Peter Gareth. "The corrosion of mild steel in the presence of two isolates of marine sulphate reducing bacteria". Thesis, University of Portsmouth, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340914.
Pełny tekst źródłaParker, C. H. J. "The influence of sulphate-reducing bacteria on hydrogen absorption by steel during microbial corrosion". Thesis, Cranfield University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280776.
Pełny tekst źródłaPhilp, J. C. "Corrosion of steel mediated by sulphate-reducing bacteria, with reference to nuclear waste disposal". Thesis, Edinburgh Napier University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377584.
Pełny tekst źródłaPemmaraju, Prajyula. "Zinc Silicate Based Pigments for Corrosion Inhibition of Cold Rolled Steel". University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552657123301627.
Pełny tekst źródłaPrithiraj, Alicia. "Corrosion behaviour of ferrous and non-ferrous alloys exposed to sulphate - reducing bacteria in industrial heat exchangers". Thesis, Vaal University of Technology, 2018. http://hdl.handle.net/10352/433.
Pełny tekst źródłaCorrosion responses of some carbon steels, stainless steel and copper alloys in the presence of a culture of bacteria (referred to as SRB-Sulphate-reducing bacteria) found in industrial heat exchangers, was studied to recommend best alloys under this service condition, with techno-economic consideration. Water from cooling towers in three plants in a petrochemical processing complex were analysed for SRB presence. Two of the water samples showed positive indication of SRB presence. The mixed cultures obtained from plant one were grown in prepared media and incubated at 35 °C for 18 days. Potentiodynamic polarisation studies in anaerobic conditions were done on the selected alloys in aqueous media with and without the grown SRB. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were then used to study the corrosion morphology and corrosion products formation. The voltamograms show higher icorr for alloys under the SRB compared to the control media, indicating the SRB indeed increased the corrosion rates. The surface analysis showed pitting on steel alloy ASTM A106-B. Localised attack to the grain boundaries on a selective area, was seen on ASTM A516-70 dislodging the grains, and intergranular corrosion was seen throughout the exposed area of ASTM A179. Copper alloys showed pitting on ASTM B111 grade C71500 (70-30), and denickelification on ASTM B111 grade C70600 (90-10), and is a good alternative material for use apart from carbon steel alloys, recording a low corrosion rate of 0.05 mm/year. The EDS analysis supported the findings showing higher weight percent of iron and sulphur on surface of the alloys after exposure to the SRB media. This implies that the presence of the sulphur ion indeed increased the corrosion rate. ASTM A516-70 carbon steel was chosen as a suitable alternative material to the stainless steel in this environment. The Tafel plot recorded a corrosion rate of 1.08 mm/year for ASTM A516-70 when exposed to SRB media.
Asselin, Edouart. "High temperature and high pressure corrosion of Ni-based alloys and stainless steels in ammoniacal sulphate solution". Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/30709.
Pełny tekst źródłaApplied Science, Faculty of
Materials Engineering, Department of
Graduate
Merrique, J. L. "Corrosion monitoring in hydrocarbon and aqueous systems contaminated by the sulphate-reducing bacteria, using the AC impedance technique". Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375345.
Pełny tekst źródłaKulas, Gregory S. "An investigation of some factors affecting the corrosion of carbon steel boiler tube material exposed to simulated kraft smelt". Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/5494.
Pełny tekst źródłaBeraldo, Camila Haga. "Efeito da temperatura de envelhecimento sobre as propriedades mecânicas e resistência à corrosão por pite do aço inoxidável martensítico endurecido por precipitação UNS S46500". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-15102014-163925/.
Pełny tekst źródłaThe precipitation hardened stainless steels have been widely used in the aircraft industry to combine mechanical strength, fracture toughness and corrosion resistance. And therefore, are materials that enable replacement of the carbon steels used today, which require additional surface treatment, such as cadmium plating, to improve the corrosion resistance. The use of such coatings brings disadvantages such as cost, manufacturing, susceptibility to hydrogen embrittlement beyond environmental aspects. In this context, the precipitation hardened steel UNS S46500, known as Custom 465® were evaluated for the effect of aging temperature on the mechanical properties and the resistance to pitting corrosion .Treated samples in solubilized and aged condition at 510°C (H950) and 538ºC (H1000) were subjected to tensile strength test, microstructural characterization and potentiodynamic polarization (PP) tests to determine the pitting corrosion resistance. The microstructural studies were performed with the aid of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction. Analyzes were also performed using the Thermo -Calc software. The resistance to pitting corrosion was evaluated at 0.6M NaCl solution with increasing additions of Na2SO4. The results obtained from tests of PP in both heat treatment conditions were compared with each other and with results available in the literature (CALDERÓN HERNANDEZ, 2012) to stainless steel UNS S30403 (304L). The analysis of the microstructure revealed that the steel aged Custom 465 ® presents a martensitic matrix, chi precipitates, Ni3Ti precipitates and austenite phase. The H950 age treatment had higher mechanical strength and lower elongation than the treatment H1000. Such behavior was due to the production of higher percentage of chi and a lower percentage of austenite phase in aging treatment. The different heat treatments, solubilized condition, H950 and H1000 showed almost the same pitting corrosion resistance. On the other hand, the Custom 465® showed good response to pitting inhibition with increasing nucleating additions of sulfate in 0.6M NaCl, with enhanced result for H1000 condition. Furthermore, by adding sulfate was possible to obtain greater pitting corrosion resistance of Custom 465® compared to the 304L steel. This behavior has been discussed in terms of the chemical affinity between nickel, chloride and sulphate, leading to higher pitting corrosion resistance when the steel contains a higher nickel 9 content (which is the case of steel Custom 465®). This study indicates that the criterion in selecting the aging heat treatment of Custom 465® steel must be the desired mechanical properties, since the pitting corrosion resistance was found to be substantially independent of heat treatment.
Leek, Darrell Stewart. "A study of the effects of chloride and sulphate on the hydration of portland cement and the corrosion of carbon steel reinforcement using electron-optical techniques and energy dispersive X-ray analysis". Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265400.
Pełny tekst źródłaHorák, Marek. "Analýza stárnutí vybraných materiálů stokových sítí". Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-233817.
Pełny tekst źródłaLin, W. L., i 林文龍. "Hydrogen Sulphide Stress Corrosion Cracking of 2.25Cr-Mo Steel Weldments". Thesis, 1997. http://ndltd.ncl.edu.tw/handle/84179662839891527062.
Pełny tekst źródła國立海洋大學
材料工程研究所
85
Constant extension rate tensile tests were performed to investigate the fracture characteristics of the A387 steel weldments in H2S charging environment.
Akinwale, Abiodun Ebebezer. "The effect of South African quaternary supplementary cementitious blends on corrosion behaviour of concrete reinforcement in chloride and Sulphate media". Diss., 2018. http://hdl.handle.net/10500/25242.
Pełny tekst źródłaCivil and Chemical Engineering
M. Tech. (Chemical Engineering)