液压活塞杆上电镀铁镍钨和镍钨磷合金的耐磨和耐蚀性能比较

Comparison of wear and corrosion resistance of iron–nickel–tungsten and nickel–tungsten–phosphorus alloy coatings electroplated on hydraulic piston rod

在45钢表面电镀了Fe–Ni–W和Ni–W–P合金。对比了两种钨合金镀层热处理后的显微硬度、元素组成和结晶情况,通过磨擦磨损试验、中性盐雾试验和浸泡腐蚀试验比较了它们的耐磨和耐蚀性能。Fe–Ni–W和Ni–W–P合金镀层均光亮、平滑,晶粒尺寸均在10~40 nm范围内,摩擦因数分别为0.086 1和0.094 4。Ni–W–P合金镀层的耐蚀性优于Fe–Ni–W合金镀层,经中性盐雾试验、5%盐酸浸泡和5% NaOH溶液浸泡96 h后依旧光亮,没有锈蚀点。

Fe-Ni-W and Ni-W-P alloy coatings were electroplated on the surface of 45 steel, respectively. The microhardness, elemental composition and crystallization state of the two kinds of tungsten alloy coatings after heat treatment were compared, and their wear and corrosion resistance were compared through friction and wear test, neutral salt spray test and immersion corrosion test. Both Fe-Ni-W and Ni-W-P alloy coatings are bright and smooth with a grain size in the range of 10-40 nm. The friction coefficient is 0.086 1 for Fe-Ni-W alloy coating and 0.094 4 for Ni-W-P. The Ni-W-P alloy coating is still bright without any rust spot on its surface after neutral salt spray test and immersion in 5% hydrochloric acid or 5% NaOH solution for 96 h, showing a better corrosion resistance than the Fe-Ni-W alloy coating.