... to form intermetallic phases. Another aspect is that the material is fully austenitic which indicates that the alloy is not prone to hydrogen embrittlement. Some failures have occurred on precipitation hardened Ni-base alloys due to hydrogen embrittlement. 5 It should be noted that UNS N08935 is cold...

... that the mass of the precipitated FeCO3 layer did not change with increasing NaCl concentration even though the saturation value of FeCO3 3.) was far below 1 and dissolution of FeCO3 was expected. It was hypothesized that the calculation of 3 was incorrect due to inaccurate equations for dissociation...

..., the strength of the 6 Mo alloy increases substantially. This is likely due to the precipitation of undesirable intermetallic phases during the PCHT. Table 2: Tensile Properties of Alloy 642 and Comparative Alloys in the Solution Annealed and Post-Clad Heat Treated Conditions Alloy 642 Alloy 904L 6 Mo Alloy...

... managed. Recent studies have shown that scaling processes on the surface are not necessarily a result of precipitation of crystals in the bulk solution and that they do not often share the same trends with regards to crystal growth kinetics and inhibition. Most of the past studies on scale deposition have...

... to corrosion inhibitors that have greater film persistence. The use of Langmuir adsorption is appropriate for non-scaling environments. In many instances, CO 2 corrosion is associated with iron carbide or iron carbonate on the surface. 2 Complications occur due to scale precipitation alongside inhibitor...

... remediation Hydrate Remediation hydrate inhibition scale remediation Production Chemistry asphaltene inhibition concentration nucleation permission Upstream Oil & Gas deposition calcium carbonate texas 77084 wax remediation oilfield chemistry scale inhibition precipitation dynamic tube...

... carbonate while at the same time affected the nucleation process showing catalytic activity. Higher acceleration was found for higher microalgae populations. The extracellular components of the test microalgae are believed to play an important role on the nucleation and the subsequent rate of precipitation...

... ABSTRACT The precipitation of calcium sulphate dihydrate (CaSO 4 •2H 2 O, gypsum) was studied at 25 °C at constant calcium ion activity. The stability domain of the system and the kinetics of spontaneous precipitation of gypsum from unstable supersaturated solutions was investigated...

... ABSTRACT Calcium ions are usually present at high concentrations in brines produced with oil and gas. Such brines are often saturated with respect to calcium carbonate (CaCO 3 ). Consequently, precipitation of CaCO 3 as scale on the internal wall of the pipeline can readily occur due...

... at ambient pressure in a three-electrode cell setup. The atmosphere constituted of pure CO 2 at three different temperatures, namely: 40°C, 60°C, and 80. Linear Polarization and potentiodynamic sweeps were used to investigate the electrochemical behavior. The corrosion products and precipitates were...

... ABSTRACT In this study, the effect of polymer architecture (i.e., composition, functional group, monomer type, etc.) on calcium oxalate (CaOx) precipitation in aqueous solution was investigated using the spontaneous precipitation method. The polymers tested include: natural, bio...

... precipitated form wastewater supersaturated with respect to this salt. 1-3 Phosphorus and nitrogen recovery from wastewater is challenged by the presence of heavy metals and other toxic substances. Toxic species may interact or even coprecipitate struvite lattice ions and thus render the main use of struvite...

... ABSTRACT Slow strain rate test and rising displacement fracture toughness test were performed to evaluate hydrogen embrittlement of three heats of precipitation hardened UNS N07718 nickel alloys in 3.5wt% NaCl, under cathodic polarization at low temperature 4.4°C (40°F). The susceptibility...

...-steels is, that they are prone to precipitate intermetallic phases as sigma phase in particular in a temperature range of 950 °C to 1050 °C for example during hot forming or heat treatments. The sigma phase is a brittle intermetallic phase containing chromium, molybdenum, nickel and iron and needs...

.... Precipitation Hardened (PH) nickel based alloys provide high strength and ductility along with excellent resistance to localized corrosion and stress corrosion cracking in sour service conditions in HPHT conditions. This is evident in the successful use of PH nickel alloys like 718 in a wide range of subsea...

... facility in Groß Schönebeck (Germany), massive copper precipitation has been observed downhole clogging the production well. Occurring mechanisms and measures to prevent copper precipitation or scaling needed to be investigated. This contribution deals with the evaluation of the corrosion behavior...

... ABSTRACT Precipitation Hardened (PH) nickel alloys have been used extensively and successfully in the Oil & Gas Industry for many years. These materials offer high strength and outstanding corrosion resistance in many aggressive environments and they are a common selection for high...

... ABSTRACT The influence of mono ethylene glycol (MEG) on the precipitation of calcium carbonate was investigated at constant supersaturation, 25°C, pH 8.5. Seeded and unseeded experiments were done in aqueous supersaturated calcium carbonate solutions containing MEG over the concentration...

..., which is based on Mg 2+ or Al 3+ chelation by the anionic phosphonate additives. INTRODUCTION Metal silicates form in process waters with high silica and polyvalent metal ion content. 1,2 Such precipitates/deposits are common in geothermal installations. Iron and magnesium silicates exhibit low...

... Remediation hydrate inhibition asphaltene remediation polymer Publication Division texas 77084 asphaltene inhibition inhibitor ch 2 scale remediation Production Chemistry remediation of hydrates functional group amjad synthetic polymer copolymer Upstream Oil & Gas precipitation acrylic...