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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Plasma Electrolytic Oxidation (PEO) Process on Commercially Pure Ti Surface: Effects of Electrolyte on the Microstructure and Corrosion Behavior of Coatings
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Plasma Electrolytic Oxidation (PEO) Process on Commercially Pure Ti Surface: Effects of Electrolyte on the Microstructure and Corrosion Behavior of Coatings

机译：商业纯Ti表面上的等离子体电解氧化（PEO）方法：电解质对涂层微观结构和腐蚀行为的影响

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The current study investigates the ceramic oxide coatings formed on commercially pure Ti substrate via plasma electrolytic oxidation (PEO) technique in electrolytes with different chemical compositions. The effects of electrolyte on the discharge characteristics, macro- and micro-structure, thickness, phase compositions, and corrosion behaviors of coatings were evaluated. Five kinds of electrolytes based on the sodium salt compounds including aluminate, phosphate, silicate, aluminate-phosphate, and aluminate-silicate were used. The PEO processes were carried out at fixed voltage (420 V) for 180 seconds. The morphology and phase composition of samples were investigated using scanning electron microscope (SEM) and X-ray diffractometer (XRD), respectively. The corrosion behavior of specimens was analyzed in a 3.5 wt pct NaCl solution using the electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests. The results showed that the most uniform and dense structure with less porosity was obtained in the coating prepared in aluminate-phosphate-based electrolyte. This coating consisted of TiO2 (Rutile and Anatase) and TiAl2O5 phases. Also, it was confirmed that the noblest corrosion potential and lowest corrosion current density, and consequently, the best corrosion behavior (22.96 x 10(7) Omega cm(2)), were observed for aluminate-phosphate-based electrolyte. The Mott-Schottky analysis exhibited that all samples had n-type semiconducting behavior. The coating prepared in aluminate-phosphate-based electrolyte possessed the lowest donor densities. (C) The Minerals, Metals & Materials Society and ASM International 2018
机译：目前的研究调查了具有不同化学组成的电解质形成在市售纯Ti基板通过等离子体电解氧化（PEO）技术陶瓷氧化物涂层。电解质对放电特性，宏观和微观结构，厚度，相组合物和涂料的腐蚀行为的影响进行了评价。使用五种基于钠盐化合物，包括铝，磷酸盐，硅酸盐，铝酸盐，磷酸盐，铝酸盐和硅酸盐电解质。所述PEO工艺物在180秒的固定电压（420 V）进行。样品的形貌和相组成，使用扫描电子显微镜（SEM）和X射线衍射（XRD）研究了分别，。在使用电化学阻抗谱（EIS）和电位极化测试3.5重％的NaCl溶液进行分析的试样的腐蚀行为。表明，在该涂层获得最均匀且致密的结构具有较少多孔性的结果为基础的铝酸盐 - 磷酸盐电解质制备。该涂层包括二氧化钛（金红石和锐钛矿）和TiAl2O5相。另外，可以确认，最高尚腐蚀电位和最低腐蚀电流密度，因此，最好的腐蚀行为（22.96×10（7）欧米茄厘米（2）），观察到对于基于铝酸盐 - 磷酸盐电解质。莫特 - 肖特基分析显示，所有样品具有n型半导体特性。在基于铝酸盐 - 磷酸盐电解质中制备的涂层所具有的最低施主密度。 （c）2018年矿物质，金属和材料协会和ASM国际

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