摘要:课题阐述了镀锌低铬彩色钝化工艺,高铬钝化对人体和环境的危害严重,本课题寻求在低铬条件下进行镀锌后的钝化,并得到优良性能的钝化膜。实验采用单因素试验法,改变单一的工艺参数来探求一个最适宜的工艺参数,探讨如何在大量减少铬含量的情况下,通过添加添加剂,改变工艺参数使得到的工艺能满足需求。实验中得出各工艺参数对实验过程或者实验结果的影响,测定了各个工艺参数的最佳值:铬酐3.5g/L,冰醋酸4mL/L,硝酸4mL/L,硫酸镍1.2g/L,高锰酸钾0.1g/L,锌粉0.8g,pH1.4,固化60℃,钝化液中钝化20s,空气中18s。所得的工艺适合自动线生产,并且镀液稳定、易于调整、成本低、污染少等优点,并且保证了钝化膜的外观、耐腐蚀性能、结合力等性能达到标准。
关键词:低铬;污染;镀锌层;彩色钝化 3873
Study on Low-chrome colorful passivation technology for Galvanized Coating
Abstract: Topics elaborated galvanized low chromium passivation process color, high-chromium passivation for serious harm to humans and the environment, the subject sought under conditions at low chromium passivation of galvanized and get excellent performance of the passive film. Experiments using single factor test, change a single process parameters to explore an optimum process parameters, to explore ways to reduce the chromium content in a large number of cases, by adding additives, changing the process parameters so that the resulting technology to meet the demand. The process parameters obtained in the experiment or the results of the experiment the influence of various process parameters determined optimum values: Chromic anhydride 3.5g/L, acetic acid 4mL/L, nitrate 4mL/L, nickel sulfate 1.2g/L, potassium permanganate 0.1g/L, zinc powder 0.8g, pH1.4, curing 60 ℃, passivation solution passivation 20s, the air 18s. The resulting process is suitable for automatic line production - bath is stable, easy to adjust, low cost, less pollution, etc., and to ensure that the passive film appearance, corrosion resistance, adhesion strength and other properties up to standard.
Keywords: Low-chrome;Contamination;Galvanized;Color passivation
目录
摘要 i
目录 iii
1 绪论 1
1.1 镀锌低铬彩色钝化研究的概况和意义 1
1.2 镀锌低铬彩色钝化研究的内容与目的 1
1.3 镀锌低铬彩色钝化的应用、研究情况和发展趋势 2
1.3.1 低铬钝化的应用现状 2
1.3.2 钝化膜的研究情况 2
1.3.3 钝化的发展趋势 3
1.4 镀锌低铬彩色钝化研究中要解决的问题 6
2 技术原理 7
2.1 钝化机理 7
2.1.1 钝化成膜的机理 7
2.1.2 钝化成膜理论 9
2.1.3 低铬彩钝的一些工艺因素 9
3 工艺研究方法 12
3.1 工艺研究方法 12
3.2 钝化膜性能测定方法 12
3.2.1 结合力试验 12
3.2.2 耐腐蚀性能测试 13
3.2.3 镀层厚度测试 13
4 实验研究 14
4.1 实验主要仪器、试剂、材料 14
4.1.1 主要仪器和材料 14
4.1.2 主要试剂 15
4.2 镀锌层的制备 16
4.2.1 镀液的成分 16
4.2.2 镀液的配制 16
4.2.3 添加剂的配置 16
4.2.4 电镀 16
4.2.5 出光过程 17 镀锌低铬彩色钝化工艺研究:http://www.751com.cn/cailiao/lunwen_353.html