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首页> 外文期刊>Coatings >Influence of Sealing Treatment on the Corrosion Resistance of PEO Coated Al-Zn-Mg-Cu Alloy in Various Environments
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Influence of Sealing Treatment on the Corrosion Resistance of PEO Coated Al-Zn-Mg-Cu Alloy in Various Environments

机译：密封处理对各种环境下PEO涂层Al-Zn-Mg-Cu合金耐蚀性的影响

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In the present work, a coating was prepared on an Al alloy substrate by plasma electrolytic oxidation (PEO). To seal the micro defects in the oxide scale, a siloxane layer was prepared on the PEO coating by sol gel method. The polymer sealant was synthesized from Tetraethoxy silane (TEOS) and methacryloxy propyl trimethoxyl silane (MPTES). The chemical structure of the polymer was studied by Fourier transform infrared spectroscopy (FTIR). The morphologies and microstructure of the PEO coating and siloxane coating were investigated by scanning electron microscopy (SEM). The results showed that siloxane formed a continuous layer on the surface and effectively sealed the micro defects. The corrosion behavior of the coatings in three different corrosion solutions (NaCl, HCl, and NaOH) was examined by electrochemical impedance spectroscopy and potentiodynamic polarization. The corrosion resistance of the sealed coatings was superior to that of the PEO coating because it prevented the penetration of corrosive solutions. The corrosion resistance of the sealed coatings was found to decrease with increasing electrolyte concentration. The work demonstrated that siloxane sealing may greatly enhance the corrosion resistance of Al-based PEO coating in acidic, neutral, and alkaline environments.
机译：在本工作中，通过等离子体电解氧化（PEO）在铝合金基底上制备涂层。为了密封氧化物垢中的微缺陷，通过溶胶凝胶法在PEO涂层上制备了硅氧烷层。聚合物密封剂由四乙氧基硅烷（TEOS）和甲基丙烯酰氧基丙基三甲氧基硅烷（MPTES）合成。通过傅立叶变换红外光谱法（FTIR）研究了聚合物的化学结构。通过扫描电子显微镜（SEM）研究了PEO涂层和硅氧烷涂层的形貌和微观结构。结果表明，硅氧烷在表面上形成连续层并有效地密封了微缺陷。通过电化学阻抗谱和电势极化检查了涂层在三种不同腐蚀溶液（NaCl，HCl和NaOH）中的腐蚀行为。密封涂层的耐腐蚀性优于PEO涂层，因为它可以防止腐蚀性溶液渗透。发现密封涂层的耐腐蚀性随着电解质浓度的增加而降低。这项工作表明，硅氧烷密封可以在酸性，中性和碱性环境下大大增强Al基PEO涂层的耐腐蚀性。

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