用X射线光电子能谱(XPS)技术研究29Cr超级双相不锈铸钢在人工海水中经电化学极化后表面腐蚀产物. 结果表明, 材料的腐蚀是以点蚀为主的局部腐蚀; MoO2-4, NH+4和少量NO3-吸附在钝化膜表面, 从而提升钝化膜的保护作用. 材料在人工海水中极化后的钝化膜表层主要由氢氧化物Cr(OH)3, FeOOH等和氧化物Cr2O3, Fe3O4, FeO, Fe2O3, MoO2, MoO3, NiO等组成; 在膜的里层有大量的金属单质Fe, Cr, Ni, Mo等和氧化物Cr2O3, Fe3O4, FeO, MoO2, NiO等及金属氮化物Cr2N等; 在钝化过程中, Cr2N向钝化膜表面富集, 有利于提高钝化膜的抗点蚀能力.
The chemical constituent of corrosion product scale on 29Cr super duplex stainless cast steel after electrochemical polarization in artificial seawater was studied by X-ray photoelectron spectroscopy in this paper. The results indicate that the corrosion is mainly pitting corrosion; MoO2-4, NH4+ and a small amount of NO-3 absorbed on the surface of the passive film so that to enhance the protectiveness of the layer. The outer portion of passive film of 29Cr super duplex stainless steel is mainly composed of hydroxide type compounds such as Cr(OH)3, FeOOH and oxides such as Cr2O3, Fe3O4, FeO, Fe2O3, MoO2, MoO3 and NiO, but its inner portion is mainly composed of abundant metallic elements of Fe, Cr, Ni, Mo and oxides including Cr2O3, Fe3O4, FeO, MoO2, NiO and some nitride such as Cr2N. During the passivation process, Cr2N tends to enrich at the passive film surface, thereby its pitting corrosion resistance may be enhanced.
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