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Effects of electric parameters on microstructure and properties of MAO coating fabricated on ZK60 Mg alloy in dual electrolyte

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Abstract

Micro-arc oxidation (MAO) process was carried out in a dual electrolyte system of NaAlO2 and Na3PO4 on ZK60 Mg alloys to explore the effect of electric parameters including current density, frequency, duty cycle and oxidation time on the evolution of coatings and other characteristics. The microstructural characteristics of coatings were observed by scanning electron microscopy (SEM) combined with the analysis of voltage-time responses during MAO process. Test of weight loss was conducted at a 3.5% NaCl solution to assess the resistance to corrosion. The results indicate that the current density and duty cycle play key roles on the coating quality. The peak voltage during MAO process increased with the increase in current density but the coating would be more easily detached when the current density was beyond a critical value. Voltage during MAO and microstructure of the coating were affected remarkably by duty cycle, and corrosion resistance was improved greatly when duty cycle was 40%. By means of single variable experiments, MAO process with optimized electric parameters was developed, which corresponds to the current density of 20 A·dm−2, frequency of 500 Hz, duty cycle of 40% and oxidation time of 15 min.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Jing Chen, Zexin Wang & Sheng Lu

  2. School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Jing Chen

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  1. Jing Chen
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  2. Zexin Wang
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  3. Sheng Lu
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Correspondence to Sheng Lu.

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Chen, J., Wang, Z. & Lu, S. Effects of electric parameters on microstructure and properties of MAO coating fabricated on ZK60 Mg alloy in dual electrolyte. Rare Metals 31, 172–177 (2012). https://doi.org/10.1007/s12598-012-0486-7

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  • DOI: https://doi.org/10.1007/s12598-012-0486-7

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