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本文用电化学动电位再活化法(EPR法)研究了奥氏体不锈钢在H_2SO_4+Na_2S_4O_6溶液中钝化区回扫电位、扫描速度、溶液温度、溶液浓度等因素对测试灵敏度的影响,确定了AISI304、316系列奥氏体不锈钢在此溶液中的最佳实验条件。并进行了不同敏化状态的奥氏体不锈钢在此溶液中的EPR测试。研究结果表明:采用Na_2S_4O_6作为活化剂的EPR法同样是一种快速、定量、非破坏性的评价奥氏体不锈钢晶间腐蚀敏感性的方法。但在实际应用时,对于304系列不锈钢选用H_2SO_4+KSCN溶液比较灵敏,而对于316系列不锈钢则选用H_2SO_4+Na_2S_4O_6溶液更为灵敏。
In this paper, we studied the influence of back sweep potential, scanning speed, solution temperature and solution concentration on the sensitivity of austenitic stainless steel in H_2SO_4 + Na_2S_4O_6 solution by electrochemical potentiodynamic reactivation (EPR) AISI304, 316 series austenitic stainless steel in this solution the best experimental conditions. The EPR test of austenitic stainless steel with different sensitization conditions in this solution was carried out. The results show that the EPR method using Na_2S_4O_6 as activator is also a rapid, quantitative and non-destructive method to evaluate the susceptibility to intergranular corrosion of austenitic stainless steel. However, in practical application, it is more sensitive to choose H_2SO_4 + KSCN solution for 304 stainless steel, while H_2SO_4 + Na_2S_4O_6 solution is more sensitive to 316 stainless steel.