环境艺术设计用铜合金的表面改性处理研究

Research on Surface Modification Treatment of Copper Alloy for Environmental Art Design

为了提升环境艺术用铜合金的耐腐蚀性能,提升艺术观赏性,对环境艺术设计用铜合金进行了表面改性处理,对比分析了打磨态、酸洗态、无铬钝化态和铬酸盐钝化态铜合金的表面物相组成、表面形貌,以及盐雾腐蚀、失重腐蚀和电化学腐蚀性能。结果表明,无铬钝化和铬酸盐钝化处理后的铜合金表面都形成了钝化膜,且铬酸盐钝化处理后铜合金表面形成了致密钝化膜;盐雾腐蚀后,无铬钝化态和铬酸盐钝化态铜合金的表面腐蚀程度会相对打磨态和酸洗态腐蚀较轻;在相同腐蚀时间下,腐蚀失重从小到大顺序为:铬酸盐钝化态<无铬钝化态<酸洗态<打磨态;无铬钝化态和铬酸盐钝化态铜合金的腐蚀电位相对打磨态、酸洗态更正,腐蚀电流密度相对小一个数量级,打磨态、酸洗态、无铬钝化态和铬酸盐钝化态的缓蚀率分别为32.32%、51.66%、89.34%和96.84%,铜合金的耐腐蚀性能从大到小顺序为:铬酸盐钝化态>无铬钝化态>酸洗态>打磨态。

In order to improve the corrosion resistance of copper alloy used in environmental art and enhance their artistic appreciation,the surface of copper alloy used for environmental art design was modified,and the surface phase composition,surface morphology,salt spray corrosion,weight loss corrosion and electrochemical corrosion properties of copper alloy were compared and analyzed under different processes of grinding,pickling,chromium free passivation and chromate passivation.The results show that the passivation film is formed on the surface of the copper alloy after chromium free passivation and chromate passivation treatment,and the dense passivation film is formed on the surface of the copper alloy after chromate passivation treatment.After salt spray corrosion,the surface corrosion degree of chromium free passivated and chromate passivated copper alloy will be relatively less than that of polished and pickled copper alloy.Under the same corrosion time,the order of corrosion weight loss from small to large is:chromate passivation state<chromium free passivation state<pickling state<polishing state.The corrosion potential of chromium free passivation state and chromate passivation state copper alloy is corrected relative to that of polishing state and pickling state,and the corrosion current density is relatively small by an order of magnitude.The corrosion inhibition rates under the different processes of polishing,pickling,chromium free passivation and chromate passivation are 32.32%,51.66%,89.34%and 96.84%respectively.The corrosion resistance of copper alloy from large to small is:chromate passivation state>chromium free passivation state>pickling state>polishing state.