预应变和敏化顺序对304不锈钢晶间腐蚀敏感性的影响

Effects of Prestrain and Sensitization Order on 304 Stainless Steel's Intergranular Corrosion Susceptibility

预应变和敏化处理均对304不锈钢晶间腐蚀敏感性有显著的影响,但是两者的先后处理顺序是否对304不锈钢存在影响还有待讨论。利用硫酸-硫酸铜腐蚀试验方法和双环电化学动电位再活化法(DL-EPR),对304不锈钢预应变和敏化处理后的晶间腐蚀敏感性进行试验研究。采用金相显微镜对硫酸-硫酸铜试验后的试样进行微观组织观察,并利用动电位再活化法进行试样敏化度(DOS)的测量。研究结果表明,在预应变程度和敏化温度时间相同的情况下,先预应变后敏化处理的304不锈钢晶间腐蚀敏感性低于先敏化处理后预应变的试样。

Both prestrain and sensitization treatment influences 304 stainless steel＇ s intergranular corrosion susceptibility obviously. Having the copper sulfate-sulfuric acid test method and the double-loop electrochemical potentiokinetic reactivation （DL-EPR） method adopted to investigate the susceptibility to intergranular corrosion was conducted, in which, having metallurgical microscope adopted to observe the specimens tested with the copper sulfate-sulfuric acid test method and having the specimens measured with DL-EPR were implemented to show that, when both prestrain degree and sensitization temperature time keeps consistent, the specimen＇ s intergranular corrosion susceptibility which receives prestrain before sensitization treatment is lower than that adopts sensitization treatment before prestrain.