对SiCp/Al复合材料表面进行浸锌前处理, 然后经过碱性预镀与酸性镀两步工艺在复合材料表面获得镍磷合金镀层; 利用形貌观察、成分分析、电化学试验、热震测试研究了镀层的组织与性能。结果表明: 经过此方法得到中磷镀层呈明显的胞状组织, 镀层较完整均匀, 厚度为15~20 μm; 经化学镀覆之后, 复合材料的自腐蚀电位得到了大幅提高, 维钝电流密度明显减小, 耐蚀性能明显提高; 复合材料与镍磷合金镀层具有较高的结合强度。

The zinc dipping pre-process was applied on SiCP/Al composites surface, and then a Ni-P alloy coating was prepared on composite surface by alkaline pre-plating and acid plating. The microstructure and properties of the coating were studied by observing morphology, chemical composite analysis, electrochemical test and thermal shock test. The results show that the obvious cell structure was found on the mid-phosphorous coating prepared by the above methods, and the coating was fairy integrated and uniform, and the thickness of the coating was 15-20 μm. The free corrosion potential increased substantially and the passive current density decreased obviously after electroless plating. The bonding strength between the composite and Ni-P alloy plating coating was fairy high.