用双环电化学动电位再活化法(DL-EPR)和临界点蚀温度(CPT)分别评价了在不同温度(600-950℃)下敏化处理2 h对SAF2304双相不锈钢的耐晶间腐蚀性能和耐点蚀性能的影响,并通过电化学蚀刻技术结合SEM对材料的微观组织演变进行了表征.结果表明,随着敏化温度的升高,SAF2304双相不锈钢的耐晶间腐蚀性能和耐点蚀性能都是先变差后增强,在700和750℃下敏化处理2h后其耐局部腐蚀性能最差.对材料微观组织形貌的表征显示,Cr2N的析出及其周边贫Cr区的形成是导致材料耐蚀性能下降的主要原因.
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