Friction and wear of nanocrystalline Co and Co-W alloy coatings produced by pulse reverse electrodeposition
Friction and wear of nanocrystalline Co and Co-W alloy coatings produced by pulse reverse electrodeposition
复制标题
脉冲反向电沉积纳米晶Co和Co-W合金镀层的摩擦磨损
DOI：
10.1016/j.wear.2013.01.120
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发表时间：
2013
期刊：
影响因子：
5
通讯作者：
P. Huang
中科院分区：
文献类型：
--
作者：
Fenghua Su;Cansen Liu;P. Huang
采用脉冲反向电沉积法在水溶液中制备了纳米晶钴（Co）和钴钨（Co-W）合金镀层。研究了涂层在不同条件下的电化学腐蚀和摩擦学性能。结果表明，纳米晶Co镀层的表面粗糙度低，晶粒尺寸小，其耐蚀性优于纳米晶Co-W合金镀层。纳米晶Co-W合金比纳米晶Co涂层具有更好的耐磨性和减摩性。纳米晶Co-W合金涂层的摩擦系数和磨损率受摩擦副材料、载荷和滑动速度等试验条件的影响。陶瓷表面提高了摩擦系数，尽管增加仍然相对较小，达到小于0.32的稳态值。高载荷下Co-W合金涂层的磨损率略高于低载荷下的磨损率。Co-W合金涂层的耐磨性与载荷无关，涂层与配对球之间的初始接触压力和配对球的硬度的增加导致涂层的耐磨性降低。解释了纳米晶Co和Co-W合金涂层在不同滑动条件和配对材料下的磨损机理，并将其与摩擦磨损性能联系起来。
Nanocrystalline cobalt (Co) and cobalt–tungsten (Co–W) alloy coatings were produced by pulse reverse electrodepositon from an aqueous bath. The electrochemical corrosion and tribological properties of the coatings under different conditions were characterized. The results show that the corrosion resistance of the nanocrystalline Co is better than that of the nanocrystalline Co–W alloy coating due to its lower surface roughness and smaller grain size. The nanocrystalline Co–W alloy displays better wear resistance and friction reduction compared to the nanocrystalline Co coating. The friction coefficients and wear rates of the nanocrystalline Co–W alloy coating are affected by the counterpart materials and the test conditions including the applied load and sliding speed. The friction coefficient is raised by the ceramic surface although the increase is still relatively small to a steady-state values less than 0.32. The wear rates of the Co–W alloy coating at high load are slightly higher than those at low load. The increase of initial contact pressure between the coating and the counterpart balls and the hardness of the counterpart balls results in the decreased wear resistance for the Co–W alloy coating independent of applied loads. The wear mechanisms of the nanocrystalline Co and Co–W alloy coatings involved in different sliding conditions and counterpart materials are explained and related to their friction and wear properties.