目的 提高核电厂海水循环水泵（以下简称“循泵”）叶轮的耐磨性能。方法 采用表面工程技术，在叶轮表面涂刷熔融环氧粉末涂层、WC涂层和耐磨陶瓷涂层，以提高叶轮的耐磨性。通过对比材料本身的硬度和断裂韧性，分别评价两种新材料在海水中的耐磨性能，并通过实践验证对三种涂层的耐磨可行性进行了详细分析。结果 分析结果表明，该双相不锈钢叶轮的损坏为典型的磨损腐蚀，同时伴随着微弱的电化学腐蚀。经过实践验证，厚度为0.8~1 mm的熔融环氧粉末涂层由于与金属基材间的结合力较差，使用一周期后存在大面积的脱落现象，起不到保护叶轮的作用。厚度为0.5 mm的WC涂层在运行后检查发现涂层存在一定程度的减薄，部分区域仍存在微弱的冲蚀现象，而且其价格较昂贵，使用效果与经济性不成比例。耐磨陶瓷涂层整体达到了牺牲涂层从而保护母材的目的。结论 实践表明仅靠选材无法彻底根除磨损腐蚀，结合表面工程技术，综合使用效果和经济性，最终确定耐磨陶瓷涂层为循泵叶轮表面防护的最佳涂层。

Objective To improve the wear-resisting property of circulating seawater pump. Methods The surface engineering technology that included SEBF coating, WC coating and wear-resisting ceramic coating were introduced to solve the problem. By comparing the hardness and toughness, the wear-resisting property of the three materials was evaluated and the feasibility was analyzed. Results The damage of duplex stainless steel impeller was typical erosion corrosion, which was accompanied with faint electrochemical corrosion. Practice proved that the 0.8~1 mm SEBF-2 coating had poor binding force with metal and it would bring about coating large area to fall off over time, which made the impeller out of protection. The 0.5 mm WC coating was thinner and the washout appeared after running. Its price was expensive and the cost performance was extremely low. The wear-resisting ceramic coating protected the base material perfectly. Conclusion The erosion corrosion cannot be removed completely only by new materials. By considering the using effect and economical efficiency and combined with the surface engineering technology, the wear-resisting ceramic is proved to be the best protective coating for impeller of circulating seawater pump.