铜及其合金的表面钝化-涂装抗蚀性能的电化学测试

Electrochemistry Measurement of Anti-corrosion on the Surface of Copperand its Alloy Treated by Passivation-painting

表面钝化与涂装工艺相结合可显著提高铜及其合金的防腐性能。采用电化学工作站对涂层腐蚀电流进行定量测量,其结果显示,常规的涂装试样,在3%NaCl盐水溶液中浸泡1天,测得腐蚀电阻(Rc)为3.56×105Ω。钝化处理后再涂装的试样测试结果为无穷大。盐水浸泡5天后,前者95%表面受到不同程度的腐蚀,后者仍然正常。后者浸泡15天的腐蚀电阻为2.31×106Ω,仍高于前者浸泡1天的数据。钝化涂装工艺可用于室外及抗腐蚀性能要求较高的铜及其合金制品的表面防护装饰。

The corrosion resistance of copper and its alloy may be improved remarkably by the method of combination of surface passivation and painting technology. Ihe electrochemistry workstation was adopted to measure corrosion current of coating quantitatively. The results show that the corrosion resistance (Rc) of sample with routine painted is 3.56×10~5Ω after dipping in 3% NaCl solution for one day, and that of sample with passivated and painted again is infinite. After dipping for 5 days, 95 percent of the surface of the former is corroded to different extent and that of the latter is still good. After dipping for 15 days, the corrosion resistance of the latter is 2.31×10~6Ω and is higher than that of the former dipping for one day. The passivation and painting technology can be used to protect and decorate the surface of copper and its alloy products in the outdoor and which need high anti-corrosion performance.