装饰用铝铜合金宽温阳极氧化及氧化膜性能研究

Study on wide-temperature anodizing of aluminum-copper alloy fordecoration and properties of anodized films

针对常规阳极氧化工艺存在允许温度范围窄、能耗较高等问题,选用三乙醇胺、硫酸铈作为添加剂加到常规硫酸电解液中。以装饰用铝铜合金作为基体进行阳极氧化实验,研究了三乙醇胺、硫酸铈单独使用或复配使用对阳极氧化温度上限和阳极氧化膜的微观形貌、成分、厚度、物相结构以及耐腐蚀性能的影响。结果表明:三乙醇胺、硫酸铈单独使用能将阳极氧化温度上限分别提高到30℃、35℃,并且都能改善阳极氧化膜的致密性,使厚度增加且耐腐蚀性能提高,但对阳极氧化膜的物相结构无影响。三乙醇胺与硫酸铈复配使用将阳极氧化温度上限提高到40℃,并且在电解液温度较高情况下仍然可以制备完全覆盖铝铜合金基体、形貌质量和耐腐蚀性能较理想的阳极氧化膜,实现节能和降低工艺成本。

In view of the narrow allowable temperature range and high energy consumption of conventional anodizing process,triethanolamine and cerous sulfate were selected as additives added to conventional sulfuric acid electrolyte.The anodizing experiment was carried out with decorative aluminum-copper alloy as the substrate,and the effects of triethanolamine and cerous sulfate used alone or in combination on the upper limit of anodizing temperature and the microstructure,composition,thickness,phase structure and corrosion resistance of anodized films were studied.The results show that triethanolamine or cerous sulfate used alone can increase the upper limit of anodizing temperature to about 30℃and 35℃respectively,and both can improve the compactness of anodized films,increase the thickness and improve the corrosion resistance.However,triethanolamine or cerous sulfate used alone has no effect on the phase structure of anodized film.The combination of triethanolamine and cerous sulfate can increase the upper limit of anodizing temperature to about 40℃,and the anodized film with ideal morphology quality and corrosion resistance can be prepared and completely covered on aluminium-copper alloy substrate under the condition of high electrolyte temperature,so as to realize energy saving and process cost reduction.