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采用光电子能谱(XPS)研究钢筋钝化膜的组成与结构,以及氯离子对钝化膜的影响。结果表明,在本实验条件下钢筋钝化膜为双层结构,外层以γ-FeOOH为主,内层主要为FeO;氯离子对胶的破坏过程可能是先在钝化膜表面吸附,然后穿透到膜中,在铁/氧化物界面即膜的内层形成FeCl_2,而使钝化膜局部溶解;复合缓蚀剂的加入使钢筋钝化膜表面γ-FeOOH的含量增大,膜中夹杂一定深度的有机铵盐,硅酸盐只在表面沉积。
Photoelectron spectroscopy (XPS) was used to study the composition and structure of the steel passivation film and the effect of chloride ion on the passivation film. The results show that under the experimental conditions, the passivation film of reinforced steel has a double-layer structure with γ-FeOOH as the outer layer and FeO as the inner layer. The destructive process of the chloride ions on the adhesive may first be adsorbed on the surface of the passive film and then Penetrate into the film, the formation of FeCl_2 at the iron / oxide interface, ie, the inner layer of the film, partially dissolves the passivation film; the addition of a composite corrosion inhibitor increases the content of γ-FeOOH on the surface of the passivation film, Mixed with a certain depth of organic ammonium salt, silicate deposited on the surface only.