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通过腐蚀失重和电化学试验,研究了不同铈含量的铸造高镍铬不锈钢在还原性酸中的耐蚀性能。测定了钝化膜的自活化时间,分析了钝化膜表层的结构、元素含量和分布及其氧化物的组态。结果表明,当钢中铈含量超过0.1%时,在钝化膜表层由于铈的富集,使耐蚀元素铬、钼含量减少,降低其稳定性,削弱钼对钝化膜的修补作用,增加膜表层活性点,从而破坏了钢的钝化,降低其耐蚀性能。
The corrosion resistance of cast Ni-Cr stainless steel with different cerium contents in reducing acid was studied by corrosion weight loss and electrochemical tests. The self-activation time of the passivation film was measured. The structure, element content and distribution of the passivation film surface and its oxide configuration were analyzed. The results show that when the content of cerium in the steel exceeds 0.1%, the content of chromium and molybdenum in the passivation film decreases due to the enrichment of cerium on the passivation film surface, reducing its stability and weakening the repair effect of molybdenum on the passivation film, increasing Film surface active point, thus undermining the steel passivation and reduce its corrosion resistance.