Aubakirova Veta, Farrakhov Ruzil, Astanin Vasily, Sharipov Arseny, Gorbatkov Mikhail, Parfenov Evgeny
Department of Electronic Engineering, Ufa State Aviation Technical University, 12 Karl Marx Street, 450008 Ufa, Russia.
Materials (Basel). 2022 Mar 8;15(6):2003. doi: 10.3390/ma15062003.
This work aimed at the development of wear and corrosion resistant oxide coatings for medical implants made of zirconium alloy, by plasma electrolytic oxidation (PEO). The effect of sodium silicate and boric acid addition to calcium acetate electrolyte on the coating properties was studied. Different aspects of the PEO coating were investigated: microstructure, electrochemical and wear behavior, wettability and apatite-forming ability. The resultant coatings consist of a dense inner layer 1.4-2.2 µm thick and a porous outer layer. The total thickness of the coating is 12-20 µm. It was found that the coating contains the tetragonal zirconia (70-95%). The obtained coatings show high corrosion resistance and reduce the surface corrosion current by 1-3 orders of magnitude, depending on the electrolyte additive, compared to the uncoated surface. The addition of boric acid to the electrolyte significantly increases the wear resistance of the coating and reduces the coefficient of friction. In terms of the combination of the coating characteristics, the electrolyte with the addition of the alkali and boric acid is recommended as the most effective.
这项工作旨在通过等离子体电解氧化（PEO）技术，为锆合金制成的医用植入物开发耐磨和耐腐蚀的氧化物涂层。研究了向醋酸钙电解液中添加硅酸钠和硼酸对涂层性能的影响。对PEO涂层的不同方面进行了研究：微观结构、电化学和磨损行为、润湿性和磷灰石形成能力。所得涂层由厚度为1.4 - 2.2 µm的致密内层和多孔外层组成。涂层的总厚度为12 - 20 µm。发现涂层含有四方氧化锆（70 - 95%）。与未涂层表面相比，根据电解液添加剂的不同，所获得的涂层显示出高耐腐蚀性，并将表面腐蚀电流降低1 - 3个数量级。向电解液中添加硼酸显著提高了涂层的耐磨性并降低了摩擦系数。就涂层特性的综合而言，添加碱和硼酸的电解液被推荐为最有效。
