辅助成膜剂对锌酸盐镀锌蓝白钝化外观的影响

发布时间：2018-04-04 09:11

本文选题：锌酸盐镀锌　切入点：三价铬蓝白钝化　出处：《电镀与精饰》2017年05期

【摘要】：镀锌蓝白钝化膜的颜色相比彩色钝化单一,钝化膜的颜色更易受到金属离子的影响,辅助成膜剂可以提高镀锌钝化膜的致密性和耐蚀性,改变钝化膜的颜色。研究发现,在三价铬基础钝化液中添加适量的硫酸钴,能增加蓝白钝化膜的蓝色并延长硫酸铜点滴试验的变色时间,但对增强钝化膜的抗盐雾性能不明显;加入适量的氯化镍,能改善蓝白钝化膜的外观,但不显著;加入0.5~2.0 g/L的镧离子对蓝白钝化膜外观没有明显的改善作用。硅酸钠虽然能提高钝化膜的耐蚀性,但增大了钝化试样的杂色,使得钝化膜的颜色不均匀。
[Abstract]:The color of blue and white passivating film is more simple than that of color passivation. The color of passivation film is more easily influenced by metal ions. Auxiliary film forming agent can improve the compactness and corrosion resistance of passivation film and change the color of passivation film.It was found that adding appropriate amount of cobalt sulfate to trivalent chromium base passivation solution could increase the blue of blue and white passivated film and prolong the discoloration time of copper sulfate drop test, but the salt spray resistance of the film was not obvious, and the proper amount of nickel chloride was added into the film.It can improve the appearance of blue and white passivated film, but it is not significant, and the blue and white passivated film can not be improved obviously by adding 0.5g / L lanthanum ion to the blue and white passivation film.Although sodium silicate can improve the corrosion resistance of the passivating film, it increases the color of the passivated sample and makes the color of the passivation film uneven.
【作者单位】：沈阳理工大学环境与化学工程学院;江苏梦得新材料科技有限公司;
【基金】：辽宁省科学技术计划面上项目(2015020189)
【分类号】：TQ153.15

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