利用电化学实验和扫描电镜(SEM)结合能谱仪(EDS)分析研究了非金属夹杂物对钛、铌双稳定439M铁索体不锈钢耐点蚀性能的影响.动电位阳极极化实验结果表明,没有或者少夹杂物区域为工作电极的试样439M Part击穿电位为813mV,比整个区域为工作电极的试样439M-Whole的击穿电位高出了约600mV.SEM结合EDS分析显示:试样439M-Whole的点蚀坑呈不规则形貌,主要发生于(Ti,Ca,Al)2O3复合夹杂物上,这是钝化膜表面不均匀和点蚀坑内的自催化反应共同作用的结果;而试样439M-Part的点蚀坑则位于(Ti,Nb)(C,N)夹杂物周围.研究表明,夹杂物周围有铬的偏析并形成铬的化合物,其周围出现贫铬区,引发点蚀.
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