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Influence of phytic acid concentration on coating properties obtained by MAO treatment on magnesium alloys

机译：植酸浓度对镁合金MAO处理后涂层性能的影响

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摘要

Anodic coatings were prepared by microarc oxidation (MAO) on AZ91HP in a base solution of 10g/L NaOH with and without the addition of 0-12 g/L phytic acid (C_6H_(18)O_(24)P_6). The influences of C_6H_(18)O_(24)P_6 and its concentration on the conductivity and breakdown voltage were studied. The morphologies and compositions of anodic coatings were determined by environmental scanning electron microscope (ESEM) and energy dispersive X-ray spectroscopy (EDX). Potentiodynamic polarization test was performed in 3.5 wt.% NaCl solution to evaluate the corrosion resistance of anodic coatings. The results showed that with the increase of C_6H_(18)O_(24)P_6 concentration, the solution conductivity decreased while the values of breakdown voltage increased. EDX analysis showed that the coatings formed in solutions with C_6H_(18)O_(24)P_6 addition contained Mg, Al, O, C, P and a trance of Na. The addition of C_6H_(18)O_(24)P_6 into the base solution was helpful in coating formation and the coatings formed in the solution containing 8 g/L C_6H_(18)O_(24)P_6 exhibited the best pore uniformity and corrosion resistance.
机译：通过在AZ91HP上的微弧氧化（MAO）在10g / L NaOH的基础溶液中添加和不添加0-12 g / L植酸（C_6H_（18）O_（24）P_6）制备阳极涂层。研究了C_6H_（18）O_（24）P_6及其浓度对电导率和击穿电压的影响。阳极涂层的形貌和组成通过环境扫描电子显微镜（ESEM）和能量色散X射线光谱仪（EDX）确定。在3.5重量％的NaCl溶液中进行电位动力学极化试验，以评价阳极涂层的耐腐蚀性。结果表明，随着C_6H_（18）O_（24）P_6浓度的增加，溶液的电导率降低，而击穿电压值升高。 EDX分析表明，在添加C_6H_（18）O_（24）P_6的溶液中形成的涂层含有Mg，Al，O，C，P和Na。在基础溶液中添加C_6H_（18）O_（24）P_6有助于涂层形成，并且在包含8 g / L C_6H_（18）O_（24）P_6的溶液中形成的涂层表现出最佳的孔均匀性和耐腐蚀性。

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  • 来源
    《Applied Surface Science》 |2009年第18期|7893-7897|共5页
  • 作者

    R.F. Zhang; S.F. Zhang; S.W. Duo;

  • 作者单位

    Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China School of Material Science and Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China;

    Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China School of Material Science and Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China;

    Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China School of Material Science and Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    magnesium alloy; MAO; electrolyte; phytic acid; concentration;

    机译：镁合金毛;电解质植酸浓度;

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