Serdechnova Maria, Karpushenkov Sergey A, Karpushenkava Larisa S, Starykevich Maksim, Ferreira Mario G S, Hack Theodor, Iuzviuk Mariia H, Zobkalo Igor A, Blawert Carsten, Zheludkevich Mikhail L
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Straβe 1, 21502 Geesthacht, Germany.
Faculty of Chemistry, Belarusian State University, Nezavisimosti Avenue 4, 220030 Minsk, Belarus.
Materials (Basel). 2018 Nov 30;11(12):2428. doi: 10.3390/ma11122428.
In the frame of the current work, it was shown that plasma electrolytic oxidation (PEO) treatment can be applied on top of phosphoric sulfuric acid (PSA) anodized aluminum alloy AA2024. Being hard and well-adherent to the substrate, PEO layers improve both corrosion and wear resistance of the material. To facilitate PEO formation and achieve a dense layer, the systematic analysis of PEO layer formation on the preliminary PSA anodized layer was performed in this work. The microstructure, morphology, and composition of formed PEO coatings were investigated using scanning electron microscopy (SEM), x-ray diffraction (XRD), and glow-discharge optical emission spectroscopy (GDOES). It was shown that under constant current treatment conditions, the PSA layer survived under the applied voltage of 350 V, whilst 400 V was an intermediate stage; and under 450 V, the PSA layer was fully converted after 5 min of the treatment. The comparison test with PEO formation on the bare material was performed. It was confirmed that during the "sparking" mode (400 V) of PEO formation, the PEO coatings, formed on PSA treated AA2024, were more wear resistant than the same PEO coatings on bare AA2024.
在当前工作范围内，研究表明，等离子体电解氧化（PEO）处理可应用于磷酸硫酸（PSA）阳极氧化的AA2024铝合金表面。PEO层硬度高且与基体结合良好，可提高材料的耐腐蚀性和耐磨性。为了促进PEO的形成并获得致密的涂层，本工作对在初步PSA阳极氧化层上形成PEO层进行了系统分析。使用扫描电子显微镜（SEM）、X射线衍射（XRD）和辉光放电光发射光谱（GDOES）研究了形成的PEO涂层的微观结构、形态和成分。结果表明，在恒流处理条件下，PSA层在350 V的施加电压下能够保留，400 V是一个中间阶段；在450 V时，处理5分钟后PSA层完全转变。进行了在裸材料上形成PEO的对比试验。结果证实，在PEO形成的“火花”模式（400 V）下，在PSA处理的AA2024上形成的PEO涂层比在裸AA2024上形成的相同PEO涂层更耐磨。
