铝合金基体上多层组合镀层的耐蚀性研究

摘要

本文结合电化学腐蚀原理及产品实际使用环境,在镍-磷合金/金双镀层基础上建立了镍-磷合金/铜/镍-磷合金/金的多层组合镀层,分析了多层组合镀层的腐蚀机理,并对其耐蚀性能进行了验证.结果表明,镍-磷合金/铜/镍-磷合金/金的多层组合镀层可满足航空产品耐192h盐雾腐蚀的使用要求,可有效提高材料的防护性能.%In this paper,the Ni-P/Cu/Ni-P/Au multi-composite coating was designed on the substrate of Ni-P/Au duplex coating,according to the electrochemistry corrosion theory and the actual environment conditions.The corrosion mechanism was discussed and the corrosion resistance was validated.The Ni-P/Cu/Ni-P/Au multi-composite coating was tested by neutral salt spray test (NSS) for 192h and showed good corrosion resistance as required by Aero-product.This multiple coating could effectively enhance the anti-corrosion performance of the aluminum alloy.