Tribological behavior of electroless Ni–B coatings on magnesium and AZ91D alloy
Tribological behavior of electroless Ni–B coatings on magnesium and AZ91D alloy
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DOI：
10.1016/j.wear.2013.06.004
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发表时间：
2013-07
期刊：
影响因子：
5
通讯作者：
E. Correa;A. Zuleta;L. Guerra;M. Gómez;J. Castaño;F. Echeverría;H. Liu;P. Skeldon;G. Thompson-G.-T
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文献类型：
--
作者：
E. Correa;A. Zuleta;L. Guerra;M. Gómez;J. Castaño;F. Echeverría;H. Liu;P. Skeldon;G. Thompson-G.-T
直接在工业纯镁和AZ91D合金表面沉积了Ni-B涂层，并用辉光放电光谱、扫描电子显微镜、X射线衍射仪进行了表征，并对涂层进行了摩擦学和力学性能评价、干滑动磨损试验和显微硬度测试。镁合金涂层的硼含量略低于AZ91D合金涂层。两种涂层的磨损率相似，比基材低两个数量级。两种涂层的摩擦系数相似，范围在∼0.31到0.34之间。AZ91D镁合金的∼值略低，接近于未涂层镁合金的值。化学镀Ni-B层的磨损机制主要为磨粒磨损、剥层和摩擦腐蚀过程。
Ni–B coatings have been deposited directly on commercial purity magnesium and AZ91D alloy and characterized using glow discharge optical emission spectroscopy, scanning electron microscopy, X-ray diffraction and, for tribological and mechanical evaluation, dry sliding wear and friction testing and microhardness measurement. The boron content of the coating on Mg was slightly lower than that of the coating on the AZ91D alloy. The wear rates were similar for both coatings and two magnitude orders lower than those of the substrates. The coefficients of friction were similar for both coatings, in the range ∼0.31 to 0.34. The values were close to that of the uncoated magnesium, while that for the AZ91D alloy was slightly lower, namely ∼0.25. The wear mechanism of the electroless Ni–B coatings was governed by the presence of abrasive wear, delamination and tribo-corrosion processes.