电沉积RE-Ni-W-B-SiC复合镀层的性能

CHARACTERISTICS OF THE ELECTRODEPOSITED RE-Ni-W-B-SiC COMPOSITE COATINGS

研究了ＲＥ－Ｎｉ－Ｗ－Ｂ－ＳｉＣ复合材料的耐磨性和耐蚀性．结果表明，在适当的镀液组成及工艺条件下，可获得组成为ＲＥ－Ｎｉ－Ｗ－４８％Ｂ－１５％ＳｉＣ的复合材料镀层．在镀液中加入少量稀土，能提高复合镀层的硬度和耐磨性；热处理温度对复合材料镀层的硬度和耐磨性有较大的影响，硬度和耐磨性随热处理温度的升高而增加．当热处理温度达到４００℃时，复合镀层的硬度达到最佳值，耐磨性在５００℃时为最好．磨损实验表明，在相同条件下，复合材料镀层的耐磨性是硬铬的４～５倍；腐蚀实验表明，复合材料镀层在各种腐蚀介质（硝酸除外）中的耐蚀性均优于１Ｃｒ１８Ｎｉ９Ｔｉ不锈钢．

The wear and corrosion resistance of RE-Ni-W-B-SiC composite coatings is investigated. The results show that the composite coatings containing 0.35%RE, 20%W, 4.8%B and 15%SiC are obtained in appropriate bath composition under controlled plating conditions. The hardness and wear resistance of the composite is increased when some RE (rare earth) is added in the bath. The heat treatment temperature has considerable effect on the hardness and wear resistance of the composite coatings: the hardness reaches the peak value at 400℃, while the wear resistance rises to the optimal value at 500℃. The wear resistance of the composite coatings is about 4～5 times that of hard chromium. Corrosion experiments indicate that the corrosion resistance of the composite in various corrosive media except nitric acid is superior to that of 1Cr18Ni9Ti stainless steel. 