介绍了一种用于航空航天零部件的高耐腐蚀性镀镉层结构,包括金属基体、预镀层、中间镀层、镀镉层以及钝化层,其中所述金属基体为钢铁基体和铝合金基体.对镀层结构进行中性盐雾试验2064h其表面无白色腐蚀物生成,耐盐雾性能比航天工业部标准QJ 453-1988《镀镉层技术条件》中96h中性盐雾试验的要求高21倍.这种保护层在耐腐蚀性上取得了重大突破,能大幅度提高航空航天零部件的使用寿命.
In this paper,a kind of cadmium coating which has high corrosion resistance and can be used for aerospace component was introduced.The structure of this cadmium coating is composed of metal substrate,bottom coating,intermediate coating,cadmium coating and passivation coating,wherein the metal substrate is steel or aluminium alloy.After neutral salt spray test for 2064 h,no white rust generated on the cadmium coating,the anti salt spray performance was 21 times higher than the requirement of neutral salt spray test 96h in QJ 453-1988 cadmium plating layer technology condition.Therefore a significant breakthrough was obtained on the corrosion resistance of cadmium coating,which could increase the service life of aerospace components greatly.
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