化学复合镀RE-Ni-Mo-P-WC合金组织结构及性能研究

Study on Microstructure and Properties of Chemical Composite Coating RE-Ni-Mo-P-WC Alloys

研究了化学复合镀RE-Ni-Mo-P-WC合金的结构和性能。发现加入稀土元素能使镀层表面的晶粒急剧细化,分散性大大加强,镀层结构由非晶态转化为晶态结构,镀层的耐蚀性略有下降,硬度随WC浓度增加而增加。钼酸钠浓度为0.05g/L并经过200℃热处理后,显微硬度增大。氧化膜的质量随温度的升高逐渐增加,但在600℃以下氧化温度对镀层增重不明显。

Microstructure and properties of chemical composite coating RE-Ni-Mo-P-WC are studied. Results show that when RE elements added, the crystalline grains rapidly becomes small particles and disperse. Microstructure changes from amorphous to crystallic. Corrosion resistance has a bit of decrease. Micros-hardness increases with WC concentration and reaches optimum when Na2MnO4·2H2O concentration is 0.05 g/L andcoating passes through heat treatment in 200℃. Weight of oxidation film increases with oxidation temperature, but it isn't obvious under 600℃.