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LDH Post-Treatment of Flash PEO Coatings

机译：LDH快闪PEO涂层的后处理

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This work investigates environmentally friendly alternatives to toxic and carcinogenic Cr (VI)-based surface treatments for aluminium alloys. It is focused on multifunctional thin or flash plasma electrolytic oxidation (PEO)-layered double hydroxides (LDH) coatings. Three PEO coatings developed under a current-controlled mode based on aluminate, silicate and phosphate were selected from 31 processes (with different combinations of electrolytes, electrical conditions and time) according to corrosive behavior and energy consumption. In situ Zn-Al LDH was optimized in terms of chemical composition and exposure time on the bulk material, then applied to the selected PEO coatings. The structure, morphology and composition of PEO coatings with and without Zn-Al-LDH were characterized using XRD, SEM and EDS. Thicker and more porous PEO coatings revealed higher amounts of LDH flakes on their surfaces. The corrosive behavior of the coatings was studied by electrochemical impedance spectroscopy (EIS). The corrosion resistance was enhanced considerably after the PEO coatings formation in comparison with bulk material. Corrosion resistance was not affected after the LDH treatment, which can be considered as a first step in achieving active protection systems by posterior incorporation of green corrosion inhibitors.
机译：这项工作研究了铝合金的有毒和致癌性六价铬基表面处理的环保替代品。它专注于多功能薄或快速等离子体电解氧化（PEO）层的双氢氧化物（LDH）涂层。根据腐蚀行为和能耗，从31种工艺（具有不同的电解质，电气条件和时间组合）中选择了三种基于铝酸盐，硅酸盐和磷酸盐的电流控制模式下开发的PEO涂层。就化学成分和在散装材料上的暴露时间而言，对原位Zn-Al LDH进行了优化，然后将其应用于所选的PEO涂层。用XRD，SEM和EDS对含或不含Zn-Al-LDH的PEO涂层的结构，形貌和组成进行了表征。较厚且多孔的PEO涂层在其表面显示出大量的LDH薄片。通过电化学阻抗谱（EIS）研究了涂层的腐蚀行为。与块状材料相比，PEO涂层形成后的耐蚀性得到了显着提高。 LDH处理后，耐腐蚀性没有受到影响，这可以认为是通过后添加绿色缓蚀剂来实现主动保护系统的第一步。

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