等离子体电解氧化处理AZ31镁合金的耐蚀性

Q3 Materials Science Koroze a ochrana materialu Pub Date : 2019-06-01 DOI:10.2478/kom-2019-0008

D. Kajánek, B. Hadzima, J. Tkacz, J. Pastorková, M. Jacková, J. Wasserbauer

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引用次数: 5

摘要

摘要:在AZ31镁合金表面制备等离子体电解氧化(PEO)涂层，评价其耐腐蚀性能。将直流电流施加于含有10 g/l Na3PO4·12H2O和1 g/l KOH的溶液中。分别制备2分钟和4分钟的样品，观察PEO涂层的演变。用扫描电镜对镀层形貌进行了表征，并用EDX分析对镀层的化学成分进行了表征。在实验室温度下，用动电位极化试验和电化学阻抗谱法测定了0.1 M NaCl溶液的电化学特性。所得数据以动电位曲线和奈奎斯特图的形式给出。分析结果表明，等离子体电解氧化涂层对AZ31镁合金在特定腐蚀环境下的耐腐蚀性有积极影响。

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Corrosion resistance of AZ31 magnesium alloy treated by plasma electrolytic oxidation

Abstract The coating prepared by plasma electrolytic oxidation (PEO) was created on AZ31 magnesium alloy surface with the aim to evaluate its effect on corrosion resistance. The DC current was applied on the sample in solution consisted of 10 g/l Na3PO4·12H2O and 1 g/l KOH. Additional samples were prepared with 2 and 4 minutes of preparation to observe evolution of the PEO coating. Morphology of the coatings was evaluated by scanning electron microscopy and chemical composition was examined by EDX analysis. Electrochemical characteristic were measured by potentiodynamic polarization tests and electrochemical impedance spectroscopy in 0.1 M NaCl at the laboratory temperature. Obtained data were presented in form of potentiodynamic curves and Nyquist diagrams. Results of analysis showed that plasma electrolytic oxidation coating positively influence corrosion resistance of AZ31 magnesium alloy in chosen corrosive environment.

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