Effect of KOH Content in the Electrolyte on Corrosion Properties of PEO-Coated EV31 Magnesium Alloy

Quality Production Improvement and System Safety Pub Date : 2023-09-01 DOI:10.21741/9781644902691-12

Knap Vidžaja, Hadzima Branislav

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Abstract

Abstract. This study analyzed the influence of electrolyte composition on the corrosion resistance of plasma electrolytic oxidation (PEO) coatings on EV31 magnesium alloy. An electrolyte solution was prepared by mixing 12 g/l Na3PO4 and various levels of KOH (1, 2, and 4 g/l). The PEO coating was produced with a direct current (DC) regime of 0.05 mA.cm-2 current density and a maximum voltage of 630 V. Electrochemical impedance spectroscopy was performed to assess the corrosion resistance after one hour exposure in 0.1 M NaCl. The results indicated that KOH content has a substantial effect on the morphology and corrosion resistance of the PEO coating and align with previous similar studies. The lowest porosity and highest polarization resistance were observed in the PEO coating prepared with 2 g/l of KOH in the electrolyte, resulting in the best corrosion resistance among the evaluated samples. The presence of only one capacitive loop in the Nyquist diagram and low polarization resistance Rp values of the samples with 4 g/l of KOH in the electrolyte indicated insufficient compactness due to high porosity of the coating.

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电解液中KOH含量对peo涂层EV31镁合金腐蚀性能的影响

摘要本研究分析了电解质成分对EV31镁合金等离子体电解氧化(PEO)涂层耐蚀性的影响。将12 g/l的Na3PO4与不同浓度的KOH(1、2和4 g/l)混合制备电解质溶液。PEO涂层是在0.05 mA的直流电流下制备的。电流密度为cm-2，最大电压为630 V。在0.1 M NaCl中浸泡1小时后，采用电化学阻抗谱法测定其耐蚀性。结果表明，KOH含量对PEO涂层的形貌和耐蚀性有显著影响，这与以往的类似研究结果一致。电解液中KOH浓度为2 g/l时，PEO涂层的孔隙率最低，极化电阻最高，耐腐蚀性最佳。当电解液中KOH浓度为4 g/l时，Nyquist图中只出现一个电容回路，极化电阻Rp值较低，说明涂层孔隙率高，致密性不足。

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Quality Production Improvement and System Safety

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