铝青铜表面粉末火焰喷涂Ni60合金涂层的耐蚀性研究

Corrosion Resistance of Ni60 Coatings Prepared on Aluminum Bronze Surface by Flame Remelting

采用氧-乙炔火焰喷涂-重熔技术在QAL9-4铝青铜表面制备Ni60合金涂层,通过静态浸泡试验﹑电化学实验及表面分析技术等方法对铝青铜基体和Ni60合金涂层在3.5%NaCl溶液中的腐蚀行为进行了研究。结果表明,Ni60合金涂层可以明显提高铝青铜基体的耐蚀性能;基体主要发生脱铝腐蚀,而涂层的腐蚀过程则是铬元素的优先溶解。

Ni60 coating was prepared on QAL9-4 aluminum bronze surface by using oxygen-acetylene flame spraying-remelting technology.The corrosion behavior of aluminum bronze matrix and Ni60 coating was studied in 3.5% NaCl solution by using static immersion test,electrochemical experiments,surface analysis technology etc.The results showed that the corrosion resistance of aluminum bronze matrix could be obviously improved after coated with Ni60;the corrosion mechanism of matrix was dealuminzation,and the corrosion process of coating was the preferential dissolution of Cr element.