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本文采用腐蚀实验、电化学测试及X光电子能谱(XPS)对不同成分的高纯铁素体不锈钢(F·S·S)在湿法磷酸中的耐蚀性及其耐蚀机理进行了研究。结果表明,铬是控制F·S·S耐蚀性的主要元素,随钢中铬量增加,耐蚀性提高。当Cr=25％时,F·S·S的耐蚀性显著增加,出现了突变效应。钼的作用则与钢中铬含量有关,足够量的铬存在对改善F·S·S耐蚀性是必不可少的。 良好耐蚀性的F·S·S表面钝化膜内存在明显的铬富集区,但没有发现钼的富集。F·S·S的耐蚀性取决于膜内Cr(Ⅰ)的相对富集程度。钼改善F·S·S耐蚀性是通过富集于活性表面上的钼氧化物大大降低了钢的活性溶解速度,促使均匀膜快速形成;同时提高了膜内铬的富集程度,进一步加强了铬的有效作用。
In this paper, the corrosion resistance, corrosion resistance and corrosion resistance of high purity ferritic stainless steels (F · S · S) in WPA were studied by means of corrosion test, electrochemical test and X-ray photoelectron spectroscopy (XPS). The results show that chromium is the main element controlling the corrosion resistance of SFS. With the increase of chromium content in the steel, the corrosion resistance increases. When Cr = 25%, F · S · S corrosion resistance increased significantly, the mutation effect. The role of molybdenum is related to the chromium content in the steel, and a sufficient amount of chromium is essential to improve the corrosion resistance of FST. Good corrosion resistance of the FSS surface passivation film there is a clear chromium-rich area, but found no accumulation of molybdenum. The corrosion resistance of F · S · S depends on the relative enrichment of Cr (Ⅰ) in the film. Molybdenum improves F · S · S corrosion resistance through the activity of molybdenum oxide enrichment on the active surface greatly reduces the rate of dissolution of steel to promote rapid formation of a uniform film; while increasing the concentration of chromium in the film to further enhance The effective role of chromium.