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首页> 外文期刊>International Journal of Electrochemical Science >Effects of Pulsed Unipolar and Bipolar Current Regimes on the Characteristics of Micro-Arc Oxidation Coating on LZ91 Magnesium-Lithium Alloy
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Effects of Pulsed Unipolar and Bipolar Current Regimes on the Characteristics of Micro-Arc Oxidation Coating on LZ91 Magnesium-Lithium Alloy

机译：脉冲单极性和双极性电流形式对LZ91镁锂合金微弧氧化涂层特性的影响

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摘要

Micro-arc oxidation (MAO) coatings on magnesium-lithium alloys were performed in an alkaline- silicate electrolyte using pulsed unipolar and bipolar current regimes to improve the corrosion resistance. The effects of a negative duty cycle of a pulsed bipolar current on the coating performance were studied at 10%, 20% and 30%. The surface morphology, element composition and phase composition of MAO coatings were examined by SEM, EDS and XRD, respectively. The corrosion resistance and porosity of the coatings were studied by potentiodynamic polarization which was performed in 3.5% NaCl solution at 25oC. The effects of the negative duty cycle on the MAO coating process and the resulting coating characteristics were discussed. Applying the pulsed bipolar current was found to promote a thinner compact coating. The corrosion resistance of the magnesium-lithium alloy was significantly improved after treatment with pulsed unipolar and bipolar current regimes. The results show that applying a 20% negative duty cycle in a pulsed bipolar current regime produces better corrosion resistance than 10% and 30% MAO coated samples.
机译：镁-锂合金上的微弧氧化（MAO）涂层是在碱性硅酸盐电解质中使用脉冲单极和双极电流机制进行的，以提高耐蚀性。在10％，20％和30％的条件下研究了脉冲双极性电流的负占空比对涂层性能的影响。用SEM，EDS和XRD分别对MAO涂层的表面形貌，元素组成和相组成进行了研究。用电位动力学极化法研究了涂层的耐腐蚀性和孔隙率，该电位极化法是在25℃下在3.5％NaCl溶液中进行的。讨论了负占空比对MAO涂层工艺及其产生的涂层特性的影响。发现施加脉冲双极电流可促进更薄的致密涂层。脉冲单极和双极电流方案处理后，镁锂合金的耐蚀性得到显着提高。结果表明，在脉冲双极电流模式下施加20％的负占空比，比10％和30％的MAO涂层样品产生更好的耐腐蚀性。

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