Electrodeposition and corrosion characterization of epoxy/polyaniline coated AZ61 magnesium alloy

IF 2.7 4区材料科学 Q3 ELECTROCHEMISTRY

Corrosion Reviews Pub Date : 2022-07-04 DOI:10.1515/corrrev-2021-0069

Vigneshkumar Murugesan, A. Perumal

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引用次数: 2

Abstract

Abstract An epoxy with 7% polyaniline (PANI) powder coating by electrostatic deposition is proposed to enhance the corrosion resistance of AZ61 magnesium alloys. The coating thickness is varied from 85 to 130 microns, and the results are compared to the corrosion resistance of epoxy coated and uncoated AZ61 magnesium alloy. The surface characterization and corrosion behaviour of AZ61 magnesium alloy + epoxy/PANI coating are examined using X-ray photoelectron spectroscopy, salt spray test, potentiodynamic test and Fourier transform infrared spectroscopy. It is observed that the polymer coating protects the base metal against corrosion and the corrosion resistance increases with coating thickness. The corrosion rate of the uncoated, 130 µm coating thickness of epoxy coated and epoxy/PANI coated AZ magnesium alloy is observed to be 0.5379, 0.0869 and 0.0372 mm/year, respectively. The corrosion resistance of epoxy/PANI coating is superior to the epoxy coating. The increase in corrosion resistance of the epoxy/PANI coated AZ61 alloy is attributed to the physical insulation and suppression of magnesium dissolution.

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环氧/聚苯胺涂层AZ61镁合金的电沉积及腐蚀性能

摘要为了提高AZ61镁合金的耐蚀性，提出了一种采用静电沉积法在环氧树脂中添加7%聚苯胺（PANI）粉末涂层的方法。涂层厚度在85微米到130微米之间变化，并将结果与环氧涂层和未涂层的AZ61镁合金的耐腐蚀性进行比较。采用X射线光电子能谱、盐雾试验、动电位测试和傅立叶变换红外光谱等方法，对AZ61镁合金+环氧树脂/PANI涂层的表面特征和腐蚀行为进行了研究。观察到聚合物涂层保护基底金属免受腐蚀，并且耐腐蚀性随着涂层厚度的增加而增加。环氧涂层和环氧/PANI涂层AZ镁合金的未涂层、130µm涂层厚度的腐蚀速率分别为0.5379、0.0869和0.0372 mm/年。环氧/聚苯胺涂层的耐腐蚀性能优于环氧涂层。环氧树脂/PANI涂层AZ61合金耐腐蚀性的提高归因于物理绝缘和镁溶解的抑制。

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来源期刊

Corrosion Reviews 工程技术-材料科学：膜

CiteScore

5.20

自引率

3.10%

发文量

审稿时长

4.5 months

期刊介绍： Corrosion Reviews is an international bimonthly journal devoted to critical reviews and, to a lesser extent, outstanding original articles that are key to advancing the understanding and application of corrosion science and engineering in the service of society. Papers may be of a theoretical, experimental or practical nature, provided that they make a significant contribution to knowledge in the field.