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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2 h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,Cr_2N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.
The intergranular corrosion resistance of SAF2304 duplex stainless steel under different temperature (600-950 ℃) for 2 h was evaluated by double ring electrochemical potentiodynamic reactivation (DL EPR) and critical pitting temperature (CPT) And pitting corrosion resistance were studied.The microstructure evolution of the material was characterized by electrochemical etching combined with SEM.The results showed that the intergranular corrosion resistance and resistance of SAF2304 duplex stainless steel increased with the increase of sensitization temperature The corrosion resistance of pitting corrosion was firstly degraded and then enhanced, and its resistance to localized corrosion was the worst after sensitization treatment at 700 and 750 ℃ for 2 h.The characterization of the microstructure of the material showed that the precipitation of Cr 2 N and its surrounding lean Cr region The formation of the corrosion resistance of materials is the main reason for the decline.