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为探讨合金元素铬和钼改善高纯度铁素体不锈钢点蚀性能的作用机理,应用XPS定量分析技术,研究了三个系列十二种不同铬钼含量的高纯度铁素体不锈钢在中性(pH=6.9)含1NCl~-的介质中不同电位下钝化膜及膜下过渡层的组成和钝化膜的厚度等。结果表明,合金元素钼不仅能提高钝化膜的稳定性,还能有效地抑制过渡层中铬的贫化,使再钝化能力得到改善,从而提高材料的耐点蚀性能。在本实验条件下不发生点蚀的材料,其过渡层都是由于基体含钼而不出现贫铬现象。
In order to explore the mechanism of improving the pitting corrosion resistance of high-purity ferritic stainless steel by using alloying elements chromium and molybdenum, three series of twelve high-purity ferritic stainless steels with different molybdenum and chromium content were studied by using XPS quantitative analysis technology in neutral pH = 6.9) containing 1NCl ~ - medium under different potentials passivation film and the composition of the transition layer and under the passivation film thickness and so on. The results show that alloying elemental molybdenum can not only improve the stability of the passivation film, but also effectively inhibit the depletion of chromium in the transition layer, improve the reactivation ability and improve the pitting corrosion resistance of the material. Pitting does not occur in the experimental conditions of the material, the transition layer is due to the matrix containing molybdenum without chrome phenomenon.