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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;MoO_4~(2-),NH_4~+和少量NO_3~-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Cr_2O_3,Fe_3O_4,FeO,Fe_2O_3,MoO_2,MoO_3,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Cr_2O_3,Fe_3O_4,FeO,MoO_2,NiO等及金属氮化物Cr_2N等;在钝化过程中,Cr_2N向钝化膜表面富集,有利于提高钝化膜的抗点蚀能力.
X-ray photoelectron spectroscopy (XPS) was used to study the surface corrosion products of 29Cr super duplex stainless steel cast by galvanic polarization in artificial seawater. The results show that the corrosion of the material is mainly localized by pitting corrosion; MoO_4 ~ (2 -), NH_4 ~ + and a small amount of NO_3 ~ - adsorbed on the passivation film surface, thereby enhancing the protective effect of passivation film.Phosphoric acid in the artificial seawater after the passivation film surface mainly by the hydroxide Cr Fe 3 O 4, FeO, Fe 2 O 3, MoO 2, MoO 3, NiO, etc. In the inner layer of the film, a large amount of metal elements such as Fe, Cr, Ni and Mo and oxides such as Cr 2 O 3, Fe 3 O 4, FeO, MoO 2, NiO, etc., and metal nitride Cr 2 N. During the passivation process, Cr 2 N is enriched on the passivation film surface, which is favorable for improving the anti-pitting resistance of the passivation film.