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首页> 外文期刊>International Journal of Electrochemical Science >Effects of One-step and Two-step Treatment Regimes on the Characteristics of Plasma Electrolytic Oxidation (PEO) Coatings on Aluminum
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Effects of One-step and Two-step Treatment Regimes on the Characteristics of Plasma Electrolytic Oxidation (PEO) Coatings on Aluminum

机译：一步和两步处理方式对铝上等离子体电解氧化（PEO）涂层特性的影响

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Plasma electrolytic oxidation (PEO) processing of aluminum is galvanostatically carried out throughone-step and two-step treatment regimes in an alkaline sodium silicate electrolyte without and withsodium tungstate additive agent. The microstructure, phase composition and corrosion resistance of theresultant coatings are investigated by means of scanning electron microscopy (SEM), X-ray diffraction(XRD), 3-dimensional imaging techniques and potentiodynamic polarization tests. Some PEO coatingsare stripped from the aluminum substrate via an electrochemical coating stripping method to intuitivelydisclose the corresponding relations among the characteristic structures of the free surface, fracturedcross-section and coating/substrate interface. Further, coating growth models describing the one-stepand two-step treatments are proposed according to the present PEO coating microstructurecharacteristics. The potentiodynamic polarization test results demonstrate that the one-step PEOcoating treated in the compound silicate-tungstate electrolyte for 20 min exhibits the best resistance tocorrosion as compared to bare Al and other PEO coatings.
机译：在没有和有钨酸钠添加剂的碱性硅酸钠电解质中，铝的等离子体电解氧化（PEO）处理是通过一步和两步处理方案进行恒电流化的。通过扫描电子显微镜（SEM），X射线衍射（XRD），3维成像技术和电位动力学极化试验研究了涂层的微观结构，相组成和耐蚀性。通过电化学剥离方法从铝基板上剥离一些PEO涂层，以直观地揭示自由表面的特征结构，断裂截面和涂层/基板界面之间的对应关系。此外，根据目前的PEO涂层微观结构特征，提出了描述一步和两步处理的涂层生长模型。电位动力学极化测试结果表明，与裸露的Al和其他PEO涂层相比，在复合硅酸盐-钨酸盐电解质中处理20分钟的一步式PEO涂层具有最佳的耐腐蚀性。

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