我国镀锌层三价铬钝化膜的性能仍不完善,为了进一步增加钝化膜的耐腐蚀能力,将纳米SiO_2加入到三价铬钝化液中,对电镀锌层进行常温彩色钝化-封闭同步处理。通过中性盐雾试验与电化学极化曲线对钝化膜的抗腐蚀性能进行评价。结果表明:钝化液中纳米SiO_2含量为3.5 g/L时,钝化液稳定,与三价铬共沉积,产生协同作用,钝化膜光亮,镀锌层的耐蚀性能显著提高。 China’s zinc coating trivalent chromium passivation film performance is still not perfect, in order to further increase the corrosion resistance of the passivation film, the nano-SiO_2 added to the trivalent chromium passivation solution, the electroplated zinc layer at room temperature color passivation - Closed synchronization. The corrosion resistance of passivation film was evaluated by neutral salt spray test and electrochemical polarization curve. The results show that the passivation solution is stable when the content of nano-SiO 2 in the passivation solution is 3.5 g / L, and co-deposition with trivalent chromium produces a synergistic effect. The passivation film is bright and the corrosion resistance of the zinc coating is significantly improved.