彩色热镀 Zn-Ti-Ni 和 Zn-Mn-Cu 合金镀层的研究

研究了彩色热镀锌工艺及彩色涂层的成色原理，进行了一系列镀浴成分和彩色热镀工艺的试验，筛选出Ｚｎ＿Ｔｉ＿Ｎｉ和Ｚｎ＿Ｍｎ＿Ｃｕ两种镀液成分，在一定的浸镀温度和冷却方式下，可以获得表面光滑、成色均匀鲜艳的彩虹、金黄、紫、蓝色镀件。通过理论分析和俄歇电子能谱、Ｘｒａｙ衍射分析，发现Ｚｎ＿Ｔｉ＿Ｎｉ彩色热镀锌层表面形成均匀的Ｔｉ的氧化物膜，Ｔｉ与Ｏ的化学计量比接近Ｔｉ２Ｏ３；ＺｎＭｎＣｕ彩色热镀锌层表面形成含ＭｎＯ和ＺｎＭｎ２Ｏ４的氧化物膜；Ｚｎ＿Ｔｉ＿Ｎｉ彩色热镀锌镀层表面产生颜色是由于氧化膜使光发生干涉而产生，表面颜色取决于氧化膜厚度；Ｚｎ＿Ｍｎ＿Ｃｕ彩色热镀锌层表面成色是由于配位场中过渡金属锰离子产生的。

STUDY IN COLOURED ALLOY COATINGS OF HOT_DIPPED Zn_Ti_Ni and Zn_Mn_Cu

The galvanizing technique and colouring mechanism of coloured hot_dipped zinc coa tings are studied in this paper.Plating bathes of Zn_Ti_Ni and Zn_Mn_Cu alloys are sieved through various bathes and tests,followed by workpieces with the iridescent,golden,purple and blue coatings that are homogeneous and smooth.It is found,from theoretical and experimental analyses,that a uniform oxide film of Ti is formed on the surface of the coloured hot_dipped Zn_Ti_Ni coating,the ratio of Ti to O of which approaches that of Ti 2O 3 and the colour of which results from the oxide film making light interfer and depends on its thickness,and that an oxide film coating of MnO and ZnMn 2O 4 is formed on the surface of the coloured hot_dipped Zn_Mn_Cu coating the colour of which results from the irons of the transition metal Mn in the ligand field.