Study on Processing Parameters of Yellow Zinc Galvanizing Process by Trivalent Chromium

• Main Authors: Chen,Chen-Tsao, 陳貞造
• Other Authors: Chung,I-Neng
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/nkfzy6

碩士 === 國立彰化師範大學 === 電機工程學系 === 105 === Galvanized parts as the underlying corrosion treatment have better anti-corrosion effect. Also, the anti-corrosion ability can be enhanced if the film formation process is subjected to electrical galvanized surface. Film formation process of the present technology is divided into hexavalent and trivalent chromium, hexavalent chromium is toxic and will cause harm to humans and the environment, and trivalent chromium is not only non-toxic and harmless to human body, is also easier to handle wastewater, not a burden on the environment. So trivalent chromium chemical conversion coating film is the mainstream of future development. Trivalent chromium chemical conversion coating film can be classified into blue zinc, multicolored, and black zinc coating, the present study was to investigate the trivalent chromium chemical conversion coating film in a colorful coating. The study includes the temperature of the reaction process, P/H value, and the corrosive nature of the completion of the plating color. Then through the key parameters in the analysis of experimental data to optimize the process to achieve low cost, good quality, high efficiency, and high yield results. In this study, the experimental results show that the process of trivalent chromium galvanizing in the P/H value of 2.2, the temperature value of 40 ℃ and the concentration of 8 % in plating environment, have superior quality that the others. In the future, trivalent chromium chemical conversion coating film will gradually replace hexavalent chromium. Because of its non-toxic, easy to handle wastewater, and meet the regulations and requirements of green production line with modern environmental.