敏化和固溶处理对核级不锈钢Z3CN20-09M相间腐蚀敏感性的影响  

Effects of Sensitization and Solid-solution Treatment on Interphase Corrosion Susceptibility of Nuclear Grade Z3CN-09M Stainless Steel

作　　者：易雪庆[1] 陆永浩[1] 陈迎锋[1] 

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083

出　　处：《中国腐蚀与防护学报》2013年第2期141-147,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：中央高校基本科研业务费(FRF-TP-09-030B);国家科技重大专项课题(2011ZX06004-009)资助

摘　　要：利用电化学动电位再活化法(EPR法)检测了核级不锈钢Z3CN20-09M奥氏体/铁素体相间腐蚀敏感性的程度。研究了敏化时间、敏化温度、固溶时间、固溶温度对Z3CN20-09M相间腐蚀性能的影响,并与304不锈钢的相应试验结果进行了对比。结果表明,核级不锈钢的相界抗腐蚀性要远高于304不锈钢;敏化温度越高,再活化率增加,相界腐蚀倾向增大,同时奥氏体晶内腐蚀加剧,敏化温度升到700°C后腐蚀到达饱和。敏化时间越长,相界腐蚀敏感性越大,但奥氏体晶内腐蚀程度下降。提高固溶温度或延长固溶时间,再活化率增加,相界和奥氏体晶内腐蚀均加剧。The interphase corrosion susceptibility of the nuclear grade stainless steel （Z3CN20- 09M） 8/T interface boundary was investigated by using electrochemical potential reactivation method （EPR）. The effects of time and temperature of sensitization and solid- solution treatments on the interphase corrosion resistance of Z3CN20-09M stainless steel were studied. The results showed that the interphase corrosion resistance of the nuclear grade stainless steel is much better than that of the 304 stainless steel. With increase the temperature of sensitization treatment, the re- activation rate ,interphase corrosion susceptibility and the degree of corrosion inside the austenite grains increase. These effects peak at 700 ~C. In addition, with increase the sensitization time, the interphase corrosion susceptibility increases, thebut the degree of corrosion inside the austenite grains decreases. The re-activation rate increase with increase of time or temperature of solid- solution treatment. The corrosion within the anstenite grains and on the phase interface are intersified as well.

关 键 词：核级不锈钢 EPR 相间腐蚀 敏化 固溶 

分 类 号：TG172[金属学及工艺—金属表面处理]