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利用极化曲线和Mott-Schottky曲线,研究了超级13Cr马氏体不锈钢在100、130、150和170℃且含CO2和Cl-的腐蚀介质中浸泡7 d所形成的钝化膜的电化学行为和半导体性质.同时应用光电子能谱表面分析技术分析了超级13Cr钝化膜中的元素价态.结果表明,超级13Cr马氏体不锈钢经腐蚀过后形成的钝化膜表层中Mo和Ni以各自硫化物的形式富集,而Cr以Cr的氧化物的形式富集.在100℃和130℃形成的钝化膜具有良好的耐蚀性,而在150℃和170℃形成的钝化膜耐蚀性下降.产生这种现象的原因与表面钝化膜的半导体性能密切相关,在100℃和130℃中形成的钝化膜具有双极性n-p型半导体特征,且随着温度升高掺杂数量增多,而150℃和170℃介质中形成的钝化膜为p型半导体,故随着温度升高,超级13Cr马氏体不锈钢的耐蚀性能下降.
The electrochemical behavior of passive 13Cr martensitic stainless steels formed by immersion in 100, 130, 150 and 170 ℃ CO2 and Cl- containing corrosive media for 7 days was investigated by using polarization curves and Mott-Schottky curves. And semiconductor properties were investigated.At the same time, the elemental valence states of the super 13Cr passivation film were analyzed by photoelectron spectroscopy analysis.The results showed that Mo and Ni in the surface of passivation film formed after corrosion of super-13Cr martensitic stainless steel were vulcanized Rich in the form of Cr, and the Cr is enriched in the form of Cr oxide. The passivation film formed at 100 ° C and 130 ° C has good corrosion resistance while the passivation film formed at 150 ° C and 170 ° C is resistant to corrosion The reason for this phenomenon is closely related to the semiconductor performance of the surface passivation film, and the passivation film formed at 100 ° C. and 130 ° C. has bipolar np-type semiconductor characteristics, and as the temperature increases, the doping amount While the passivation film formed in the medium of 150 ℃ and 170 ℃ is a p-type semiconductor. Therefore, the corrosion resistance of the super-13Cr martensitic stainless steel decreases as the temperature increases.