Synergistic Effect of Cl-and SO42-on the Corrosion Behavior of 316L Stainless Steel
In order to reduce the harm caused by corrosion to the normal operation of offshore oil and gas pipelines,the effects of the synergis-tic effect of Cl-and SO42-on the corrosion behavior of 316L stainless steel in the simulated South China Sea marine environment were investiga-ted through the AC impedance technique and the cyclic polarization technique in electrochemical tests,and the corrosion morphology of 316L stainless steel surface was characterized by scanning electron microscopy (SEM) . Results showed that when the SO42-content was constant,an increase in Cl-content could reduce the capacitive arc radius,polarization resistance Rp and pitting potential Eb . As the Cl-content increased from 0 to 50 g/L,significant corrosion was observed on the surface of 316L stainless steel. When the Cl-content was constant,an increase in SO42-content reduced the capacitive arc radius,Rp and Eb values. At the same time,the diameter of the corrosion pit on the surface of the specimen expanded,and the depth gradually deepened.
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