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Effect of heat treatment on anodization and electrochemical behavior of AZ91D magnesium alloy

机译：热处理对AZ91D镁合金阳极氧化和电化学行为的影响

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摘要

The anodic films formed on AZ91D magnesium alloy after heat treatment were analyzed and their electrochemical properties were investigated. The results showed that the cooling rate had a significant influence on the microstructure evolution of the AZ91D magnesium alloy after solution heat treatment at 440 deg C for 20 h in N_2 atmosphere. A single-phase microstructure was observed when the alloy was quenched in water after solution heat treatment. However, a duplex structure consisting of both a and p phases was found if the solution-annealed alloy was cooled in air. The differences in microstructure of the heat treated AZ91D magnesium alloy gave rise to a significant change in the property of the anodic film formed in 3 M KOH + 0.21 M Na_3PO_4 + 0.6 M KF + 0.15 M A1(NO_3)_3 electrolyte. During the early stage of anodization, for the as-cast alloy, inhomogeneous anodic films were formed exhibiting relative rough surface appearances. A rather smooth anodic film was formed for the solution-annealed AZ91D magnesium alloy either followed by air cooling or water-quenched. The surface and cross section appearance was almost the same regardless of the prior heat treatment after anodizing for 20 min. The corrosion resistances of the various anodized AZ91D magnesium alloy were evaluated and compared by employing electrochemical impedance spectroscopy (EIS). The results demonstrate that the anodic film formed on the water-quenched AZ91D magnesium alloy had a slightly higher polarization resistance than that formed on the as-cast alloy. The highest polarization resistance of anodic film was found for that formed on annealed and air-cooled alloy. The presence of Al-rich beta phase on the surface gave rise to the formation of a more protective anodic film which consisted of a great amount of A1_2O_3.
机译：分析了热处理后在AZ91D镁合金上形成的阳极膜，并研究了它们的电化学性能。结果表明，在N_2气氛中440℃固溶热处理20 h后，冷却速率对AZ91D镁合金的组织演变有显着影响。当合金在固溶热处理后在水中淬火时，观察到单相组织。但是，如果将溶液退火的合金在空气中冷却，则会发现由a相和p相组成的双相结构。热处理的AZ91D镁合金的微观结构差异导致在3 M KOH + 0.21 M Na_3PO_4 + 0.6 M KF + 0.15 M A1（NO_3）_3电解质中形成的阳极膜的性能发生重大变化。在阳极氧化的早期阶段，对于铸态合金，形成了具有相对粗糙表面外观的不均匀阳极膜。对于固溶退火的AZ91D镁合金，形成了相当光滑的阳极膜，然后进行空冷或水淬。无论阳极氧化20分钟后是否进行了预先热处理，其表面和横截面外观都几乎相同。通过使用电化学阻抗谱（EIS）评估并比较了各种阳极氧化AZ91D镁合金的耐腐蚀性。结果表明，在水淬AZ91D镁合金上形成的阳极膜具有比在铸态合金上形成的阳极膜略高的极化电阻。对于在退火和空冷的合金上形成的阳极膜，发现其阳极电阻最高。表面上富含Al的β相的存在导致形成了一种更具保护性的阳极膜，该阳极膜由大量的Al_2O_3组成。

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  • 来源
    《Journal of Materials Research》 |2005年第10期|p.2763-2771|共9页
  • 作者

    Houng-Yu Hsiao; Wen-Ta Tsai;

  • 作者单位

    Department of Materials Science and Engineering, National Cheng Rung University, Tainan, Taiwan 701, Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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