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采用AES和XPS表面分析技术,测定了OCr18Ni15Mo4奥氏体不锈钢在20％H_2SO_4和模拟湿法冶金铜电解液(20％H_2SO_4+35g/L Cu~(2+))中表面膜的合金元素分布、组态和结构。实验表明,表面钝化膜形成外层为氢氧化物和内层为氧化物的双层结构。在还原性稀硫酸中,钝化膜中形成以Mo(Ⅵ)和Cr~(3+)为主的含N氧化物、氢氧化物,当溶液中增加Cu~(2+)离子的去极化作用时,Mo元素的钝化作用受到抑制。
The surface alloying elements of OCr18Ni15Mo4 austenitic stainless steel in 20% H 2 SO 4 and simulated hydrometallurgical copper electrolytes (20% H 2 SO 4 + 35 g / L Cu 2+) were measured by AES and XPS surface analysis. Configuration and structure. Experiments show that the formation of the outer surface of the passive film of hydroxide and the inner layer of the oxide double layer structure. In reductive dilute sulfuric acid, the formation of deoxidization of Mo2 + and Cr3 + -containing N-containing oxides and hydroxides in the passive film resulted in the increase of Cu2 + ions in the solution When the role of the role of Mo passivation is inhibited.