The pitting behavior of stainless steels under SO_2 environments with Cl~- and F~-

摘要

With increasing concerns of air pollution, the emission of sulfur from industries in the form of SO_x has been closely monitored and regulated by many countries. Technological and industrial efforts have been taken in the past several decades and many clean-up methods have been developed. However, corrosion, especially pitting and stress corrosion cracking, has been reported previously under the condition with both SO_2 and Cl~-/F~- contamination in the solvent. In this paper, pitting risk of stainless steels under wet SO_2 environments with Cl~- and F~- in high temperature and high pressure conditions was investigated. Cyclic polarization measurements were used to illustrate the corrosion and passive behavior of the stainless steels under the tail gas conditions. Electrochemical behavior of stainless steels in SO_2-saturated solutions with various concentrations of Cl~- and F~- was also studied.