【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。更多还原

【Abstract】 The interphase corrosion susceptibility of the nuclear grade stainless steel(Z3CN2009M) δ/γ 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 reactivation rate,interphase corrosion susceptibility and the degree of corrosion inside the austenite grains increase.These effects peak at 700 ℃.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 solidsolution treatment.The corrosion within the anstenite grains and on the phase interface are intersified as well.更多还原