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Experimental Studies on Corrosion Behavior of Ceramic Surface Coating using Different Deposition Techniques on 6082-T6 Aluminum Alloy

机译：6082-T6铝合金不同沉积技术陶瓷表面涂层腐蚀行为的实验研究

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Aluminum alloys cannot be used in aggressive corrosion environments application. In this paper, three different surface coating technologies were used to coat the 6082-T6 aluminum alloy to increase the corrosion resistance, namely Plasma Electrolytic Oxidation (PEO), Plasma Spray Ceramic (PSC) and Hard Anodizing (HA). The cross-sectional microstructure analysis revealed that HA coating was less uniform compared to other coatings. PEO coating was well adhered to the substrate despite the thinnest layer among all three coatings, while the PSC coating has an additional loose layer between the coat and the substrate. X-ray diffraction (XRD) analysis revealed crystalline alumina phases in PEO and PSC coatings while no phase was detected in HA other than an aluminum element. A series of electrochemistry experiments were used to evaluate the corrosion performances of these three types of coatings. Generally, all three-coated aluminum showed better corrosion performances. PEO coating has no charge transfer under all Inductive Coupled Plasma (ICP) tests, while small amounts of Al3+ were released for both HA and PSC coatings at 80 °C. The PEO coating showed the lowest corrosion current density followed by HA and then PSC coatings. The impedance resistance decreased as the immersion time increased, which indicated that this is due to the degradation and deterioration of the protective coatings. The results indicate that the PEO coating can offer the most effective protection to the aluminum substrate as it has the highest enhancement factor under electrochemistry tests compared to the other two coatings.
机译：铝合金不能用于侵蚀性腐蚀环境应用。在本文中，使用三种不同的表面涂层技术涂覆6082-T6铝合金以增加耐腐蚀性，即等离子体电解氧化（PEO），等离子喷射陶瓷（PSC）和硬阳极氧化（HA）。横截面微结构分析显示，与其他涂层相比，HA涂层较少。尽管所有三个涂层中最薄的层，PEO涂层良好地粘附到基板上，而PSC涂层在涂层和基板之间具有额外的松散层。 X射线衍射（XRD）分析显示PEO和PSC涂层中的结晶氧化铝相，而在除铝元件之外的HA中没有检测到相位。使用一系列电化学实验来评估这三种类型的涂层的腐蚀性能。通常，所有三涂层的铝均显示出更好的腐蚀性性能。 PEO涂层在所有电感偶联等离子体（ICP）测试下没有电荷转移，而在80℃下，释放少量Al3 + Al3 +。 PEO涂层显示出最低的腐蚀电流密度，然后是HA，然后是PSC涂层。由于浸入时间增加，阻抗电阻降低，这表明这是由于保护涂层的降解和劣化。结果表明，与其他两种涂层相比，PEO涂层可以为铝基衬底提供最有效的铝基基材保护。

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