304奥氏体不锈钢在酸性氯离子溶液中应力腐蚀性能的研究

摘要

采用慢应变速率拉伸实验研究了304奥氏体不锈钢在60℃时,不同氢离子浓度的NaCI溶液中的应力腐蚀性能.实验结果表明,随着氢离子浓度的增大,304不锈钢的应力腐蚀敏感性增强,但是当氢离子浓度达到一定程度时,应力腐蚀敏感性显著下降,这是由于当氢离子浓度过大时,均匀腐蚀的作用优先于应力腐蚀作用成为主导.在这种阳极溶解型应力腐蚀开裂中,氢和应力的交互作用增加了304不锈钢在酸性氯离子溶液中的应力腐蚀敏感性.%Slow strain rate tests were adopted to study stress corrosion properties of 304 austenitie stainless steel in the environment of different concentration of acid NaCI solution at the temperature of 60℃. Test result showed that with the increasing of H<'+ concentration, stress corrosion cracking sensitivity increased, however, when H<'+ concentration reached a critical value, stress corrosion cracking sensitivity decreased drastically due to general corrosion. Although the mechanism of stress corrosion cracking for 304 stainless steel in acid NaCI solution is anodic solution, interaction of hydrogen and stress increased stress corrosion cracking sensitivity in the environment of acid NaCI solution.