摘要:
The effect of H
2S on the corrosion behavior of 316L stainless steel was investigated using electrochemical methods by changing the gas condition from CO
2 to H
2S and then back to CO
2. The presence of H
2S showed an acceleration effect on the corrosion of 316L stainless steel in comparison with CO
2. The acceleration effect remained even after the complete removal of H
2S by CO
2, indicating that the passive film was irreversibly damaged. X-ray photoelectron spectroscopy (XPS) analysis indicated that the passive film was composed of Cr
2O
3, Fe
2O
3, and FeS
2 after being immersed in H
2S-containing solutions. The semiconducting property of the passive film was then investigated by using the Mott-Schottky approach. The presence of sulfides resulted in higher acceptor and donor densities and thus was responsible for the deterioration of passive films.