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Improvement of wear and corrosion protection of PEO on AA2024 via sol-gel sealing
Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2021-04-21 , DOI: 10.1016/j.surfcoat.2021.127195
Luciane Sopchenski , Julien Robert , Matthieu Touzin , Arnaud Tricoteaux , Marie-Georges Olivier

Plasma electrolytic oxidation (PEO) is a versatile and cost-effective technique to obtain protective oxide coatings in light metals, although its intrinsic porosity is a drawback for long-term corrosion resistance. Sol-gel layers are pointed as a useful tool to seal PEO porosity and increase its corrosion resistance, although little is known about its influence on the wear performance of PEO coatings. In this study, a PEO coating obtained on AA2024 was sealed with a hybrid sol-gel via dip-coating. Two withdrawal speeds were set in order to investigate the influence of the sol-gel filling in its sealing ability. Both sol-gel application conditions were able to fill the PEO pores and microcracks and change its wettability. EIS results showed samples sealed with sol-gel maintained the protective behavior upon 28 days and increased the resistance of the system by several orders of magnitude in comparison to unsealed PEO coatings. Pin-on-disk tests indicate the sol-gel decrease the shear stresses of the coating, decreasing its wear rate in 40% compared to the unsealed PEO.



中文翻译:

通过溶胶-凝胶密封改善AA2024上PEO的磨损和腐蚀防护

等离子体电解氧化(PEO)是一种在轻金属中获得保护性氧化物涂层的通用且具有成本效益的技术,尽管其固有的孔隙率是长期耐蚀性的一个缺点。溶胶-凝胶层被认为是密封PEO孔隙率并提高其耐腐蚀性的有用工具,尽管对其PEO涂层的磨损性能的影响知之甚少。在这项研究中,在AA2024上获得的PEO涂层通过浸涂用杂化溶胶-凝胶密封。为了研究溶胶-凝胶填充对其密封能力的影响,设定了两个抽出速度。两种溶胶-凝胶施加条件均能够填充PEO孔和微裂纹并改变其润湿性。EIS结果表明,与未密封的PEO涂层相比,用溶胶-凝胶密封的样品在28天后仍保持了保护性能,并使系统的阻力提高了几个数量级。针在磁盘上的测试表明,溶胶-凝胶降低了涂层的剪切应力,与未密封的PEO相比,其磨损率降低了40%。

更新日期:2021-04-26
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