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采用表面分析技术,研究了铸造高硅不锈钢在98%H_2SO_4、70℃介质中,表面膜中元素分布及腐蚀行为与其元素所处价态的关系。试验结果表明,高硅不锈钢在浓硫酸中,表面膜因抗蚀作用不同可分为三层,表面层、中间层和过渡层。表面层及中间层都具有抗腐蚀能力,可阻挡介质对不锈钢基体的浸蚀,中间层中富集硅和铬,主要以 SiO_2和 Cr_2O_3形式存在。而镍富集在过渡层中,可进一步提高膜的稳定性。
The surface analysis technique was used to study the relationship between elemental distribution and corrosion behavior of the as-cast high silicon stainless steel in 98% H 2 SO 4, 70 ℃ medium and its valence state. The experimental results show that the surface of high silicon stainless steel in concentrated sulfuric acid can be divided into three layers, the surface layer, the middle layer and the transition layer due to the different corrosion resistance. Both the surface layer and the middle layer have anti-corrosion ability, which can block the erosion of the stainless steel substrate. The middle layer is rich in silicon and chromium, mainly in the form of SiO 2 and Cr 2 O 3. The nickel enrichment in the transition layer, can further improve the stability of the membrane.