两步等离子体电解氧化陶瓷涂层的结构、腐蚀和力学行为（英文）

发布时间：2018-05-25 05:18

本文选题：等离子体电解氧化 + 显微结构　；参考：《Transactions of Nonferrous Metals Society of China》2017年10期

【摘要】：等离子体电解氧化(PEO)被认为是提高轻合金表面性能的一种低成本和环境友好的表面处理工艺。采用两步PEO法研究Ti6Al14V合金上陶瓷涂层的形成,并将该涂层样品的结构、电化学和力学性能与在碱性电解液中采用一步PEO法的样品进行比较。利用场发射扫描电镜(FESEM)和X射线衍射(XRD)技术对其结构性能进行表征。采用线性极化法进行电化学研究,并使用Knoop显微硬度和纳米压痕法研究其力学性能。结果表明,第二步电解氧化使涂层表面孔隙率和平均孔径都增大,两步法导致涂层厚度从12.5增加到13.0μm。电化学测试结果表明,第二步导致极化电阻从1800.2下降到412.5 k?/cm~2,保护效率从97.8%降至90.5%。纳米压痕结果表明,在酸性电解液中采用第二步加工工艺后,PEO涂层变得更加柔软,但韧性更大。
[Abstract]:Plasma Electrolytic Oxidation (PEO) is considered to be a low cost and environmentally friendly surface treatment process for improving the surface properties of light alloys. The formation of ceramic coating on Ti6Al14V alloy was studied by two-step PEO method. The structure, electrochemical and mechanical properties of the coating were compared with the sample prepared by one-step PEO method in alkaline electrolyte. Its structure and properties were characterized by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) techniques. The electrochemical properties were studied by linear polarization method, and the mechanical properties were studied by Knoop microhardness and nano-indentation method. The results showed that the surface porosity and average pore size of the coating were increased by the second step electrolytic oxidation, and the thickness of the coating was increased from 12.5 to 13.0 渭 m by the two-step method. The results of electrochemical measurements show that the second step results in the decrease of polarization resistance from 1800.2 to 412.5 kW / cm ~ (-2) and the decrease of protection efficiency from 97.8% to 90.5%. The results of nano-indentation show that the PEO coating becomes softer but with greater toughness after the second step process is used in acidic electrolyte.
【作者单位】： Mechanically
【基金】：International affairs department of University of Tehran and Sarkhoon & Qeshm Gas Treating Company for the financial support of this study
【分类号】：TG174.453

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