Environmentally-friendly black chrome-silver-free zinc-plating passivation solution and preparation method thereof

一种无铬无银的环保型镀锌黑色钝化液及其制备方法

Abstract

The invention provides black passivation solution for zinc-plating post treatment. 1 liter of black passivation solution consists of 10 to 20g of sodium silicate, 20 to 30g of copper sulfate, 0.5 to 1.5g of nickel sulfate, 0.5 to 1.5g of ferrous sulfate, 1 to 3g of sodium acetate, 20 to 40mL of glacial acetic acid, 3 to 7mL of sulfuric acid (98 percent) and the balance of water. A zinc-plating material processed by the passivation solution has a uniform, bright and black appearance and high corrosion resistance, is free of rust for over 200h through a neutral salt spray test and can achieve the same effect as that achieved by the conventional black chrome-silver-contained passivation process in appearance and performance. The passivation solution has the advantages of thoroughly solving the problem of environment pollution caused by a chromium salt used by the conventional black zinc-plating passivation process, eliminating the use of a silver salt at the same time and greatly reducing the cost thereof by substituting silicate for the chromium salt as a main film-forming material and a copper salt, a nickel salt and a ferric salt for the silver salt as a blackening agent, along with stability and reliability and high film-forming efficiency.
本发明提供一种用于镀锌后处理的黑色钝化液,由下列组分组成:硅酸钠10~20g/L、硫酸铜20~30g/L、硫酸镍0.5~1.5g/L、硫酸亚铁0.5~1.5g/L、醋酸钠1~3g/L、冰醋酸20~40mL/L、硫酸(98%)3~7mL/L、其余为水。经本钝化液处理后的镀锌材料呈现均匀、光亮、黑色外观,而且耐蚀性能优良,经中性盐雾试验,出锈时间可达到200小时以上,在外观和性能方面均可达到现有含铬含银黑色钝化工艺的效果。本发明以硅酸盐代替铬盐作为主要成膜物质,以铜盐、镍盐、铁盐代替银盐作为发黑剂,从根本上解决了现有镀锌黑色钝化工艺使用铬盐所带来的环境污染问题,同时取消了对银盐的使用,大幅降低了钝化液成本,该钝化液稳定可靠,成膜效率高。

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Cited By (11)

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