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首页> 外文期刊>Corrosion Engineering, Science and Technology >Comparison of corrosion resistance of microarc oxidation coatings prepared with different electrolyte concentrations on AM60 magnesium alloy
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Comparison of corrosion resistance of microarc oxidation coatings prepared with different electrolyte concentrations on AM60 magnesium alloy

机译：不同电解质浓度对AM60镁合金微弧氧化膜耐蚀性的比较

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摘要

The microarc oxidation (MAO) of AM60 magnesium alloy in two kinds of electrolytes is studied in this paper to compare the influence of electrolytes on the properties of the MAO coatings. One concentrated electrolyte is composed of 100 g L~(-1) NaOH + 20 g L~(-1) Na_2B_4O_7·10H_2O + 50 g L~(-1) C_6H_5Na_3O_7·2H_2O + 60 g L~(-1) Na_2SO_3.·9H_2O and the other is a dilute solution, which is composed of 5 g L~(-1) NaOH + 15 g L~(-1) Na_2SO_3.9H_2O. It was found that the sparking behaviour in dilute electrolyte is more intensive and the breakdown voltage U_B is higher (the U_B in dilute electrolyte is 282 V, while it is 82 V in the concentrated electrolyte). The thermal effect during the MAO in the two electrolytes is also measured, and the temperature increment in dilute electrolyte is more than twice of that in the concentrated electrolyte. The corrosion resistance of the MAO films is studied by electrochemical impedance spectroscopy and potentiodynamic polarisation techniques and the microstructure of the films is examined by SEM. The electrochemical tests show that the MAO film formed in the concentrated electrolyte is more corrosion resistant. Scanning electron microscope shows that the microstructure of the MAO film in dilute electrolyte is porous and thin, which accounts for its poor corrosion resistance. The experiment results show that high U_B does not mean good corrosion resistance.
机译：本文研究了两种电解质中AM60镁合金的微弧氧化（MAO），以比较电解质对MAO涂层性能的影响。一种浓电解质由100 g L〜（-1）NaOH + 20 g L〜（-1）Na_2B_4O_7·10H_2O + 50 g L〜（-1）C_6H_5Na_3O_7·2H_2O + 60 g L〜（-1）Na_2SO_3组成。 ·9H_2O，另一种是稀溶液，由5 g L〜（-1）NaOH + 15 g L〜（-1）Na_2SO_3.9H_2O组成。发现稀电解质中的火花行为更强烈并且击穿电压U_B更高（稀电解质中的U_B为282V，而浓电解质中的U_B为82V）。还测量了两种电解质在MAO期间的热效应，稀电解质中的温度升高是浓电解质中温度升高的两倍以上。通过电化学阻抗谱和电位动力学极化技术研究了MAO膜的耐腐蚀性，并通过SEM观察了膜的微观结构。电化学测试表明，在浓电解质中形成的MAO膜更耐腐蚀。扫描电子显微镜表明，稀电解质中MAO膜的组织是多孔且薄的，这是其耐腐蚀性差的原因。实验结果表明，较高的U_B并不意味着良好的耐腐蚀性。

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