Effect of electrolyte additives on anti-corrosion ability of micro-arc oxide coatings formed on magnesium alloy AZ91D
Effect of electrolyte additives on anti-corrosion ability of micro-arc oxide coatings formed on magnesium alloy AZ91D
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DOI：
10.1016/j.surfcoat.2009.01.032
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发表时间：
2009-04-15
影响因子：
5.4
通讯作者：
Chen, Zhi-Jia
中科院分区：
文献类型：
--
作者：
Bai, Allen;Chen, Zhi-Jia
AZ91D 合金上的氧化物涂层是使用微弧氧化技术在低外加电压下、在含有六亚甲基四胺和硼酸钠添加剂的电解质溶液中制备的。不同的电解液将施加电压从400 V改变为200 V，减小了AZ91D合金氧化物镀层的微孔尺寸。当镀液中添加添加剂时，氧化物镀层的腐蚀电流从3.6×10(-5)变为4.2×10(-7)A/cm(2)。当镀液中添加硼酸钠时，氧化物镀层的Na含量增加，提高了其防腐能力。此外，通过向电解质中添加0.1M六亚甲基四胺，表面粗糙度（Ra）从10.12降低至1.22。通过添加0.1 M六亚甲基四胺也使氧化物涂层中的裂纹变得平滑，降低了热应力。在本工作中，在碱性硅酸盐磷酸盐电解液中添加上述添加剂降低了施加电压，并对氧化物涂层进行了改性，从而获得更好的防腐能力。皇冠版权所有 (c) 2009 由 Elsevier B.V 出版。保留所有权利。
Oxide coatings on AZ91D alloy were prepared using micro-arc oxidation techniques at a low applied voltage, in electrolyte solutions with hexamethylenetetramine and sodium borate additives. The different electrolyte solutions changed the applied voltage from 400 to 200 V and reduced the micro-pore size of the oxide coating on the AZ91D alloy.The corrosion current of the oxide coating changed from 3.6 x 10(-5) to 4.2 x 10(-7) A/cm(2) when the additives were added to the plating solution. When sodium borate was added to the plating solution, the Na content of the oxide coating was increased, improving its anti-corrosion ability. Moreover, the surface roughness (Ra) was reduced from 10.12 to 1.22 by the addition of 0.1 M hexamethylenetetramine to the electrolyte. The cracks in the oxide coating were also smoothed by the addition of 0.1 M hexamethylenetetramine, reducing the thermal stress.In this work, the addition of the aforementioned additives to the alkaline silicate phosphate electrolyte reduced the applied voltage and modified the oxide coating, resulting in better anti-corrosion ability. Crown Copyright (c) 2009 Published by Elsevier B.V. All rights reserved.