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首页> 外文期刊>Corrosion Engineering, Science and Technology >Corrosion protection of Mg-11Li-3Al-0·5RE alloy using hybrid epoxy/silica conversion coatings
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Corrosion protection of Mg-11Li-3Al-0·5RE alloy using hybrid epoxy/silica conversion coatings

机译：混合环氧/二氧化硅转化膜对Mg-11Li-3Al-0·5RE合金的腐蚀防护

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摘要

In order to obtain effective corrosion protection for Mg-11Li-3Al-0·5 rare earth alloy, a combined epoxy/SiO_2 hybrid conversion coating was investigated in this paper. Initially ceria or phytic acid conversion coatings were applied on the substrate, then an epoxy/SiO_2 hybrid coating was applied on top of the conversion coating. Potentiodynamic polarisation curves were used to evaluate the effects of the silica content on corrosion resistance, and an optimum was confirmed at 3 wt-%. Hydrogen evolution and salt spray testing were employed to compare the corrosion resistance of the ceria and phytic acid based hybrid coatings and results indicated that the phytic acid hybrid coating was more effective than the ceria based coating. This was ascribed to reaction between the phytic acid functional groups (hydroxyl and phosphate) with the epoxy/SiO_2 hybrid coatings increasing adhesion between the coatings. The corrosion of the phytic acid based hybrid coating was investigated using electrochemical impedance spectroscopy which confirmed that a diffusion mechanism could explain the overall corrosion process and the advantages of the phytic acid hybrid coating.
机译：为了获得对Mg-11Li-3Al-0·5稀土合金的有效腐蚀防护，本文研究了环氧/ SiO_2杂化转化复合涂层。最初将二氧化铈或植酸转化涂层涂覆在基材上，然后在转化涂层的顶部涂覆环氧/ SiO_2杂化涂层。电位动力学极化曲线用于评估二氧化硅含量对耐蚀性的影响，确定最佳浓度为3 wt％。用氢气析出和盐雾试验比较了二氧化铈和植酸杂化涂料的耐腐蚀性，结果表明植酸杂化涂料比二氧化铈基涂料更有效。这归因于植酸官能团（羟基和磷酸酯）与环氧/ SiO_2杂化涂层之间的反应，从而增加了涂层之间的附着力。使用电化学阻抗谱研究了基于植酸的杂化涂层的腐蚀，这证实了扩散机理可以解释整个腐蚀过程以及植酸杂化涂层的优势。

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