Materials Literature
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Abstract Carbon steel is being considered as a candidate canister material for high level waste disposal in underground geologic repository systems where anoxic to reducing conditions dominate after the thermal period. For example, the supercontainer concept in Belgium's proposed Boom Clay repository concept comprises…
In this study, we investigated a biological activity of nonwoven polycaprolactone scaffolds for controlled delivery of vascular endothelial growth factors. The tube scaffolds with incorporated vascular endothelial growth factors were fabricated by method of electrospinning. The polycaprolactone scaffold containing gro…
Abstract To ensure and optimise oil and gas production and whilst maintaining integrity, chemicals are added to avoid hydrate formation, corrosion, scaling and to stimulate production. To be successful on all areas a critical balance of chemistry is required where all aspects need to be considered and no details can b…
The dynamic crosslinking of polyamide 6,12 and ethylene vinyl acetate (PA6,12/EVA) blends in the mixing chamber of a torque rheometer was investigated. EVA was selectively crosslinked within the PA6,12 phase through free radical reactions using dycumil peroxide. The degree of EVA crosslinking in the PA12,6/EVA materia…
Abstract There is general industry recognition that production chemistry is a growing concern from the conceptual design and FEED stage through to the lifetime operations. The global opportunities within the subsea market, in both greenfield and brownfield, have only become more complex. The increasing complexity in s…
Abstract Corrosion behavior of carbon and galvanized steel samples were investigated in two test environments containing 200 ppm chloride solution. The first set up used 10% inhibitor, while the second used dry air to maintain moisture levels below 40% RH at 20 psi applied pressure. The corrosion rate of the exposed s…
Abstract Calcium carbonate is one of the most abundant minerals precipitating during gas production. This work is focused on precipitation of CaCO3 in presence of Monoethylene glycol (MEG), used as hydrate inhibitor. MEG is known to affect the thermodynamics of calcium carbonate and this study shows that it has a larg…
Abstract The pH stabilization technique is a method for control of sweet corrosion in wet gas pipelines. The method is suited for systems with MEG for hydrate control as the pH stabilizer will remain in the lean MEG and do not need a continuous injection. Full pH stabilization is used when the risk for production of f…
Abstract Oilfields generate less gas pressure as they mature. As a result, ingress of oxygen into well annuli, into the vapor space in tanks, and through pump packing becomes more common.1 Consequently, it is possible for severe localized corrosion to occur on carbon steel metals. Unfortunately, there are very few opt…
Abstract Hydrogen embrittlement (HE) of Ni-base alloys is an important concern for sour well applications and is very sensitive to microstructure of the alloys. Using tensile tests, we show that in H-charged UNS N07725 fracture is a mixture of transgranular ductile and brittle-like intergranular failure. We assess the…
Abstract Corrosion of carbon steel in the H2S partial pressure range of 1-20 bar was studied in a series of autoclave experiments. CO2 was also present at partial pressures of 1-20 bar. Experiments were run at temperatures in the range of 10-120 deg C. The test solutions consisted of high-salinity brine (100 g/L NaCl,…
Abstract Compared to the standard UO2–Zirconium (Zr) based system, accident tolerant nuclear fuels need to tolerate loss of active cooling in the core for a considerably longer time period while maintaining or improving the fuel performance during normal operation conditions. Advanced steels such as iron-chromium-alum…
Corrosion in soil environments is a serious threat to underground metallic structures such as oil and gas pipelines, waste containers and pilings. This study investigates the relationship between in-situ soil parameters and metal loss of X70 carbon steel. A total of 207 carbon steel coupons of X70 were installed under…
High solid (HS) alkyd resins with low amount of volatile organic compounds (VOC) were developed as the result of new VOC solvent directive that limit the amount of VOC in decorative paints. Due to specific chemical structure of HS alkyd resins and possible deterioration of some applicative properties the optimal combi…
The inhibition of mild steel corrosion in sulphuric acid solution was studied with application of Africa parquetina leaves extract (APLE) using Gravimetric, Gasometric and Thermometric measurements. The phytochemical characterization of the leaves extract were also carried out using Gas chromatography mass spectroscop…
Abstract Nickel-based Alloy UNSa N07718 is used extensively in Oil & Gas upstream applications because of its high mechanical strength and good uniform corrosion resistance; however, in chloride environments N07718 can suffer localized attack, either due to pitting or crevice corrosion. An alternative to N07718 fo…
Abstract The crevice corrosion resistance of super-duplex S32750, and super-austenitic S31254 and S32654 stainless steels was assessed in chloride solutions, at different temperatures. Alloys S32750 and S31254 suffered crevice corrosion between 30 and 90°C, while alloy S32654 only suffered crevice corrosion at 60 and…
Abstract In light of the in progress revision process of API 6A718 and API 5CRA specifications, a new precipitation hardenable Ni-base alloy has been developed for applications in H2S and hydrogen charging environments. The new alloy has received the UNS assignment of UNS N09955. It is patent pending and is being subm…
Abstract Carbon steel pipes used to transport hydrocarbons and dangerous fluids are provided with corrosion prevention systems, namely an insulating coating and a cathodic protection (CP) system which reduces (or halts) corrosion rate below 10 µm/y, which is the maximum accepted corrosion according to standards. The p…
Corrosion of aluminum in HCl solutions and its inhibition by aqueous extract of Olive seeds (OS) extract have been reported. The study was carried out using weight loss, hydrogen evolution at 30 and 40C and the results were supporting by surface examination study (SES) and electrochemical impedance spectroscopy (EIS)…