典型不锈钢晶间腐蚀敏化温度的研究

SENSITIVE TEMPERATURES FOR INTERGRANULAR CORROSION OF TYPICAL STAINLESS STEELS

用电化学动电位再活化(EPR)法、硫酸-硫酸铜法及扫描电镜研究了典型的202、304奥氏体不锈钢与409、430铁素体不锈钢在不同敏化温度下晶间腐蚀的敏感性.结果表明,奥氏体与铁素体不锈钢敏感温度区间不同,奥氏体不锈钢诱发晶间腐蚀的敏感温度约为650℃,铁素体不锈钢诱发晶间腐蚀的敏感温度约为950℃.研究结果为正确地评判不锈钢晶间腐蚀敏感性及优化生产工艺提供了科学依据.

Electrochemical potentiodynamic reactivation （ EPR ） test, sulphuric acid - sulphate of copper （GB4334.5- 90） and scanning electron microscope were utilized in this paper to study the intergranular corrosion susceptibility of 202,304 austenitic stainless steels and 409,430 ferritic stainless steels at different sensitive heat treatment temperatures, at which intergranular corrosion will be induced. The results show that the sensitive temperature of austenitic stainless steels and that of ferritic stainless steels are different. The sensitive temperature of austenitic stainless steel is about 650℃, while that of ferritic stainless steel is around 950℃. The results provide scientific criterion for correctly evaluating the intergranular corrosion susceptibility of stainless steel and optimizing the production technology.