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在LY12铝合金表面制备了防护性溶胶凝胶膜层,并研究了乙酸钴的掺杂对膜层耐蚀性能的影响。采用扫描电子显微镜(SEM)和电子能谱(EDS)分别观测溶胶凝胶膜层的微观结构和成分。采用电化学方法研究了乙酸钴浓度对溶胶膜层在浸泡实验中耐蚀性的影响;通过观察人为缺陷处在0.05mol/L NaCl腐蚀溶液中形貌、成分的变化,对乙酸钴的缓蚀机理进行了探讨。研究表明,掺杂适量的乙酸钴不仅可以提高溶胶凝胶膜层的耐蚀性能,而且可以为受到破坏的溶胶凝胶膜提供缓蚀性能。然而相对高浓度的掺杂量则会降低膜层的稳定性,破坏溶胶凝胶膜层的腐蚀防护性能。
The protective sol-gel film was prepared on the surface of LY12 aluminum alloy and the effect of cobalt acetate doping on the corrosion resistance of the film was studied. The microstructure and composition of the sol-gel film were observed by scanning electron microscopy (SEM) and electron spectroscopy (EDS). The effect of cobalt acetate concentration on the corrosion resistance of the sol film in immersion test was studied by electrochemical method. The corrosion resistance of cobalt acetate was observed by observing the change of morphology and composition of the artificial defect in 0.05 mol / L NaCl solution Mechanism is discussed. The results show that adding appropriate amount of cobalt acetate can not only improve the corrosion resistance of the sol-gel film, but also provide corrosion inhibition for the damaged sol-gel film. However, the relatively high concentration of doping will reduce the stability of the film and destroy the corrosion protection of the sol-gel film.