Aluminum (Al) alloys are used widely in the automotive and aerospace industries, but their corrosion resistance is insufficient in long-term service, particularly in a high-salinity environment. The incorporation of molybdenum disulfide (MoS₂) particles into plasma electrolytic oxidation (PEO) coatings formed on an aluminum alloy was investigated in this work. After oxidation, the coatings were investigated by a series of structural, morphological and electrochemical corrosion tests to understand the effect of molybdenum disulfide addition to the base electrolyte. The phase compositions and surface morphology of coatings were analyzed through X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM), respectively. The XRD results showed that all coatings were primarily composed of α-aluminum oxide (α-Al₂O₃), γ-aluminum oxide and molybdenum disulfide phases. The FESEM observations indicated that molybdenum disulfide particles were successfully incorporated in the ceramic coating and the apparent porosities decreased with increasing molybdenum disulfide concentration. The electrochemical corrosion tests indicated that the amount of coating porosity decreased and the corrosion current density decreased from 79·6 μA/cm² in the bare aluminum alloy to 58·1 and 30·1 μA/cm² in the PEO coatings without and with the molybdenum disulfide additive, respectively. This behavior could be attributed to the beneficial effect of the molybdenum disulfide particles, which might play an important role in blocking micropores and microcracks.

中文翻译：

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铝合金上制备的MoS2结合PEO涂层的腐蚀行为

铝（Al）合金广泛用于汽车和航空航天工业，但在长期使用中，尤其是在高盐度环境中，其耐腐蚀性不足。掺入二硫化钼（MoS ₂在这项工作中，我们研究了颗粒进入在铝合金上形成的等离子体电解氧化（PEO）涂层的过程。氧化后，通过一系列结构，形态和电化学腐蚀试验研究了涂层，以了解将二硫化钼添加到基础电解质中的作用。分别通过X射线衍射（XRD）和场发射扫描电子显微镜（FESEM）分析了涂层的相组成和表面形态。XRD结果表明，所有涂层主要由氧化α -铝的（α-Al系₂ ö ₃），γ-氧化铝相和二硫化钼相。FESEM观察表明，二硫化钼颗粒已成功掺入陶瓷涂层中，并且随着二硫化钼浓度的增加，表观孔隙率降低。电化学腐蚀测试表明，涂层的孔隙率降低，腐蚀电流密度从裸铝合金中的79·6μA/ cm ²降低到无和有PEO涂层中的58·1和30·1μA/ cm ²。二硫化钼添加剂。此行为可归因于二硫化钼颗粒的有益作用，这可能在阻止微孔和微裂纹方面起重要作用。