Intensive investigations on the composition and morphology of corrosion products were performed for studying metallurgy and solution effects in CO2 corrosion of low alloy steels with different micro structure and elemental composition (38 Mn 6 - C75/2, 38 Mn 6 - J55, 41 MnV 5 - C95, 25 CrMo 4 - C95). The corrosion products were generated in autoclave tests on coupons on rotated cylinders within 7 d at 100°C, 6 bar CO2 and 6 m/s. SEM/EDX analysis revealed that metal dissolution rate and the susceptibility to localized corrosion are significantly influenced by metal related and soultion related parameters (e.g. alloy composition, micro structure, salinity of the liquid, presence of certain metal salts in low concentrations). Lead salts in concentrations as low as 10-3mol/l proved to be highly effective to inhibit localized attack, even in the case of active metal dissolution in pits.

Subject
Materials, Inhibitor performance, Composition, Salts, Additives, Inspection, Lead, Corrosion products, Salt concentration, Surface layers, Steel, Localized corrosion, Chlorides
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1988
Association for Materials Protection and Performance (AMPP)
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