Abstract CoCrMo is commonly used as the femoral head material in the artificial hip joint. In order to increase the wear and corrosion resistance of the femoral head, the use of ceramic coating has been reported. Besides the tribological properties of the coating, coating adhesion is of paramount importance in prolonging the service life of the implant. The present study aims at improving the adhesion of ZrO2 sol-gel coating on CoCrMo substrate via pretreatment of the substrate. Two types of pretreatment, namely, electro-etching and electrodeposition of Co, were attempted to create different surface topography on the substrate. It is found that electrodeposition under appropriate conditions (current density of 100 mA/cm2 for 150 s) could effectively increase the adhesion strength, by about 37% and 83% for the load of first crack (Lc1) and the load of breakthrough (Lc2), respectively. The improvement could be attributed to the creation of a densely populated “prolate spheroids”, which provided an increased contact area for bonding and mechanical interlocking.

中文翻译：

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电化学预处理提高溶胶-凝胶涂层在 CoCrMo 上的附着强度

摘要 CoCrMo 是人工髋关节中常用的股骨头材料。为了增加股骨头的耐磨性和耐腐蚀性，已有报道使用陶瓷涂层。除了涂层的摩擦学特性外，涂层附着力对于延长植入物的使用寿命至关重要。本研究旨在通过对基材进行预处理来提高 ZrO2 溶胶-凝胶涂层在 CoCrMo 基材上的附着力。两种类型的预处理，即 Co 的电蚀刻和电沉积，试图在基板上产生不同的表面形貌。发现在适当条件下电沉积（电流密度为100 mA/cm2 150 s）可以有效提高附着强度，初裂载荷 (Lc1) 和突破载荷 (Lc2) 分别降低了约 37% 和 83%。这种改进可能归因于创建了一个人口稠密的“扁长球体”，它为粘合和机械互锁提供了更大的接触面积。