Analysis of adsorption of carbon steel corrosion inhibitor in model stratum waters by polylogarithmic isotherm

Using the methods of gravimetry, potentiodynamic polarization, and impedance spectroscopy, the protective effectiveness of the inhibitory composition INCORGAZ-111 with respect to hydrogen sulfide corrosion of carbon steel St3 in NACE and Samotlor oil field model stratum waters has been studied. Surface coverage is determined on the basis of the electric double layer capacity in presence of the inhibitor. Its adsorption is interpreted using the polylogarithmic isotherm with a big energy gradient of adsorption centers, that indicates linear energy heterogeneity of the surface. The constants of adsorption equilibrium, the energy gradient and the energy dispersion of adsorption centers as well as adsorption free energy were calculated.

Obtaining and investigation of the salts of cis – (2-((1h-benzo [d][1,2,3] triazol-1-yl) methyl) -1,3-dioxolan-4-yl) methyl benzoate with acetic and hydrochloric acid

New biocides (I and II) were synthesized against corrosive bacteria as a result of the reaction of cis–(2-((1H-benzo[d][1,2,3]triazol-1-yl)methyl)-1,3-dioxalan-4-yl) methyl benzoate based on benzotriazole with acetic and hydrochloric acid. Their physical-chemical properties were investigated and biocidal properties studied in various concentrations, as well as the effect of reagents on hydrogen sulfide corrosion. It was specified that the protective effect of the synthesized salts from hydrogen sulfide corrosion was 75 %, and the biocidal effect from microbiological corrosion was equal to 100 %.

Challenge and Review of Hydrogen Sulfide Corrosion Resistance Steels for Oil Country Tubular Goods

Corrosion of oil country tubular goods not only causes huge economic loss, but also brings serious environmental pollution. Stress corrosion cracking of oil country tubular goods in the sulfur-containing environment is the principal corrosion failure form in the exploitation of oil and gas process. Therefore, extensive investigations on hydrogen sulfide corrosion of steels for oil country tubular goods have been carried out. The aim of this work is to review the research progress on the hydrogen sulfide corrosion performance of steels for oil country tubular goods. The influence of alloy elements, defects, environmental factors and mechanical factors on hydrogen sulfide corrosion resistance of steels for oil country tubular goods were discussed. The future work in hydrogen sulfide corrosion performance of oil country tubular good and new sulfur-resistant steels for oil country tubular goods development were prospected.

Research on hydrogen-induced cracking behavior of normalized pipeline steel

Hydrogen sulfide corrosion test was used to test the hydrogen-induced cracking sensitivity of the normalized BNS pipeline steel. The microstructure and morphology of hydrogen induced crack(HIC) of the normalized BNS pipeline steel after hydrogen sulfide corrosion test were observed with optical microscopy(OM), scanning electron microscopy(SEM). Combined with electron probe microanalyzer(EPMA) and hardness test, the hydrogen-induced cracking behavior of BNS pipeline steel was studied from the aspects of microstructure, crack morphology, center segregation and harness. The results showed that the pearlite band with high hardness caused by center segregation of C and Mn was the main crack initiation and propagation path for the long-size and linear shape hydrogen induced crack at the center of plate thickness, and the type of crack propagation was transgranular. Some tiny hydrogen induced crack nucleated from the small calcium-aluminate inclusion and the tiny hydrogen induced crack would not propagate to form long-size cracks with no suitable propagation path existing around the inclusion.