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The pitting corrosion behavior of stainless steel(SS)304in aqueous CO2-H2S-Clenvironment was investigated by potentiodynamic cyclic anodic polarization and electron probe microanalysis(EPMA).The experimental results show that the pitting corrosion susceptivity of SS 304 increases with the increase of temperature.Chlorine ion is the prerequisite for pitting corrosion of SS 304 in H2S-CO2 environments.There is a linear relationship between the pitting corrosion potential(Eb-100)and chlorine ion concentration,and Eb-100 becomes noble with increasing pH value of the solution with or without H2 S.pH value has little effect on the protection potential with the presence of H2 S.H2S increases strongly the pitting corrosion susceptivity and deteriorates the pitting corrosion resistance of SS 304 in CO2environments.The observations by EPMA show that SS 304 in CO2-saturated NaCl solution(3 %)with H2 S suffers pitting corrosion accompanied with intergranular corrosion.
The pitting corrosion behavior of stainless steel (SS) 304 in aqueous CO2-H2S-Clenvironment was investigated by potentiodynamic cyclic anodic polarization and electron probe microanalysis (EPMA). The experimental results show that the pitting corrosion susceptivity of SS 304 increases with the increase of temperature . Chlorine ion is the prerequisite for pitting corrosion of SS 304 in H2S-CO2 environments. There is a linear relationship between the pitting corrosion potential (Eb-100) and chlorine ion concentration, and Eb-100 becomes noble with increasing pH value of the solution with or without H2 S. pH value has little effect on the protection potential with the presence of H2 S. H2S increases strongly the pitting corrosion susceptivity and deteriorates the pitting corrosion resistance of SS 304 in CO2 environment. The observations by EPMA show that SS 304 in CO2-saturated NaCl solution (3%) with H2 S suffers pitting corrosion accompanied with intergranular corrosion.