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首页> 外文期刊>Progress in Organic Coatings: An International Review Journal >Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment
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Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment

机译：电沉积铈基涂层修饰的AA6060铝合金上的环氧涂层的防护性能：后处理的影响

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Ce-based conversion coatings (CeCCs) are a promising alternative to toxic chromate coatings on the metal substrates. In this work the CeCCs were electrodeposited on aluminium alloy AA6060 from aqueous solution of Ce(NO3)(3) at different potentials (-0.95 V, -1.2 V and -1.4V). Effect of deposition potential and post-treatment in the phosphate solution on morphology and protective properties of CeCCs with top cataphoretic epoxy coating was studied. To assess the differences between the protective systems, originating from the different CeCCs pre-treatments, electrochemical impedance spectroscopy (EIS), polarization measurements, AFM and SEM/EDS analysis were used. The EIS study was undertaken to follow the evolution of corrosion behaviour of epoxy coating/CeCCs protective systems over prolonged time of exposure to the chloride environment (3 wt.% NaCl). Results suggest significantly improved corrosion stability of epoxy coating on AA6060 with as-deposited CeCCs sub-layers with respect to the same epoxy coatings with phosphate post-treated CeCCs. The far best protective properties, i.e., the greatest value of pore resistance and the lowest value of corrosion current density were provided by the epoxy coating/CeCC protective system with CeCC deposited at -1.2V and without post-treatment. (C) 2014 Elsevier B.V. All rights reserved.
机译：铈基转化膜（CeCC）是金属基材上有毒铬酸盐涂层的有前途的替代方法。在这项工作中，CeCCs以不同的电势（-0.95 V，-1.2 V和-1.4V）从Ce（NO3）（3）水溶液电沉积在AA6060铝合金上。研究了沉积电位和磷酸盐溶液中的后处理对带有顶部电泳型环氧涂层的CeCCs形态和保护性能的影响。为了评估保护系统之间的差异，使用了不同的CeCC预处理，电化学阻抗谱（EIS），极化测量，AFM和SEM / EDS分析。进行EIS研究是为了追踪环氧涂料/ CeCC防护系统在长时间暴露于氯化物环境（3 wt％NaCl）中腐蚀行为的演变。结果表明，与具有磷酸盐后处理的CeCC的相同环氧涂层相比，具有刚沉积的CeCCs子层的AA6060上的环氧涂层的腐蚀稳定性显着提高。环氧涂层/ CeCC保护系统提供了极好的保护性能，即最大的抗气孔性和最低的腐蚀电流密度值，其中CeCC沉积在-1.2V且无后处理。 （C）2014 Elsevier B.V.保留所有权利。

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