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首页> 外文期刊>Journal of Materials Engineering and Performance >Combined Effect of Long Processing Time and Na2SiF6 on the Properties of PEO Coatings Formed on AZ91D
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Combined Effect of Long Processing Time and Na2SiF6 on the Properties of PEO Coatings Formed on AZ91D

机译：长加工时间和Na2SiF6对AZ91D上形成的PEO涂层性能的综合影响

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摘要

In this study, protective ceramic coatings were prepared on AZ91D magnesium alloy by plasma electrolytic oxidation (PEO) to improve the corrosion and mechanical properties of AZ91D magnesium alloy. The process was conducted in silicate-fluoride-based electrolyte solution. It was found that the average micro-hardness of the coating was significantly increased with an increase in the PEO processing time. The highest value of the average micro-hardness similar to 1271.2 HV was recorded for 60-min processing time. The phase analysis of the coatings indicated that they were mainly composed of Mg2SiO4, MgO, and MgF2 phases. The surface and cross-sectional study demonstrated that porosity was largely reduced with processing time, together with the change in pore geometry from irregular to spherical shape. The results of the polarization test in 3.5 wt.% NaCl solution revealed that aggressive corrosion took place for 5-min sample; however, the corrosion current was noticeably decreased to 0.43 x 10(-7) A/cm(2) for the 60-min-coated sample. The superior nobility and hardness for long processing time are suggested to be due to the dense and highly thick coating, coupled with the presence of MgF2 phase.
机译：在本研究中，通过等离子电解氧化（PEO）在AZ91D镁合金上制备保护性陶瓷涂层，以改善AZ91D镁合金的腐蚀和力学性能。该过程在基于硅酸盐-氟化物的电解质溶液中进行。已经发现，随着PEO处理时间的增加，涂层的平均显微硬度显着增加。在60分钟的处理时间内记录了类似于1271.2 HV的平均显微硬度的最大值。涂层的相分析表明，它们主要由Mg2SiO4，MgO和MgF2相组成。表面和横截面研究表明，随着加工时间的增加，孔隙率大大降低，同时孔隙几何形状也从不规则形状变为球形。在3.5％（重量）的NaCl溶液中进行极化测试的结果表明，5分钟的样品发生了腐蚀。但是，对于60分钟涂层的样品，腐蚀电流显着降低至0.43 x 10（-7）A / cm（2）。长期加工时间的优异贵金属和硬度被认为是由于致密且高度厚的涂层以及MgF2相的存在所致。

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