Electrochemical Properties of Plasma-Electrolytically Oxidized Aluminum Coatings Sprayed on MA5 Magnesium Alloy

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science Pub Date : 2023-12-28 DOI:10.1007/s11003-023-00742-x

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Abstract

The aluminum-based coating was sprayed onto a substrate made of MA5 magnesium alloy by detonation and thermal vacuum methods. Potentiodynamic polarization studies were carried out to evaluate corrosion resistance of the modified surfaces. Thermal vacuum coating is non-porous, but thin (approx. 50 μm). The plasma-electrolytic oxidation (PEO) layer of the aluminum coating almost does not interact with the magnesium base during the process of synthesizing the oxide ceramic coating. The corrosion resistance of the detonation coating was twice as high as that of the MA5 magnesium alloy, but the layer synthesized on the PEO coating neutralized this effect. This is related with the growth of the PEO layer through the sprayed coating (thickness approx. 200 μm) to the base and the presence of through pores in it, which over time causes the spalling of such a combined coating. The opposite electrochemical picture is observed on the surface of the thermal vacuum sprayed coating without and with the presence of the PEO layer on it. Here the corrosion currents are lower in 25 times and by 2 orders of magnitude, respectively. Such a significant difference in the corrosion resistance of aluminum coatings is caused by their porosity and structural defects due to the peculiarities of the technological process.

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喷涂在 MA5 镁合金上的等离子电解氧化铝涂层的电化学特性

通过引爆和热真空方法将铝基涂层喷涂到 MA5 镁合金基材上。为评估改性表面的耐腐蚀性，进行了电位极化研究。热真空镀膜无孔但很薄（约 50 μm）。在合成氧化物陶瓷涂层的过程中，铝涂层的等离子电解氧化（PEO）层几乎不与镁基发生作用。起爆涂层的耐腐蚀性是 MA5 镁合金的两倍，但在 PEO 涂层上合成的层中和了这一影响。这与 PEO 层通过喷涂涂层（厚度约为 200 μm）向基底生长以及其中存在通孔有关，随着时间的推移，通孔会导致这种组合涂层剥落。在无 PEO 层和有 PEO 层的热真空喷涂涂层表面观察到的电化学情况则截然相反。这里的腐蚀电流分别降低了 25 倍和 2 个数量级。铝涂层的耐腐蚀性能之所以存在如此显著的差异，是由于技术工艺的特殊性造成的多孔性和结构缺陷。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Science 工程技术-材料科学：综合

CiteScore

1.60

自引率

44.40%

发文量

审稿时长

4-8 weeks

期刊介绍： Materials Science reports on current research into such problems as cracking, fatigue and fracture, especially in active environments as well as corrosion and anticorrosion protection of structural metallic and polymer materials, and the development of new materials.