为了提高铜及其合金的耐蚀性能,研究了稀土La盐与BTA 对铜合金缓蚀的协同作用,化学处理后的铜合金表面耐蚀性能得到改善。利用扫描电镜及XRD,对铜合金处理后的表面形貌及结构进行了分析;通过阳极极化、交流阻抗等电化学测试方法分析了La盐与BTA 对铜合金表面性能的影响。结果表明:稀土La盐与BTA 的加入使铜合金表面形成了均匀、致密的转化膜,从而提高了铜合金表面的耐蚀性能。

In order to improve corrosion resistance of copper and its alloy, the synergistic effects between lanthanum salts and BTA was investigated. The corrosion properties of copper alloys were improved greatly after passivation. The morphologies and structure of coating after treating were identified by X-ray diffraction analysis(XRD) and SEM(electron microscope). The effect of lanthanum salts and BTA on the surface preparation for copper alloys was analyzed by anodic polarization curves and EIS impedance measurements. The result shows that the exterior structures of copper alloys is uniformity and compact. So the corrosion resistance of copper alloys by lanthanum salt and BTA conversion coating is improved greatly.