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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Copper(II) Ions on Corrosion Resistance of Al-Zn Coated 5052 Aluminum Alloy in Seawater
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Effect of Copper(II) Ions on Corrosion Resistance of Al-Zn Coated 5052 Aluminum Alloy in Seawater

机译：铜（II）离子对海水中Al-Zn涂覆5052铝合金耐腐蚀性的影响

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摘要

The corrosion resistance of the composite anti-corrosion coating formed by an aluminum-zinc coating and epoxy sealer on the surface of an open rack vaporizer (ORV) in seawater was investigated at different copper ion (Cu2+) concentrations. The surface microstructure of the coating was characterized by ultrafield 3D observation, SEM and energy spectrum analysis (EDS). The sealer was found to be effective in shielding the coating surface and significantly reduced the corrosion rate of the coating. A dissolution process of the passive film on the coating surface is evident from the potentiodynamic polarization curves and surface morphology. Local corrosion occurs on the coating surface, and the number and area of surface corrosion pits increase with the concentration of copper in solution, indicating a decrease of the corrosion resistance of the coating. Weight loss of the samples increases from 4.5 mg to 5.4 mg after a 32 days immersion, and the damage of copper ions on the coating originates from weak positions of the surface. The electrochemical corrosion behavior of the coating was investigated by dynamic potential polarization and electrochemical impedance spectroscopy (EIS), with a positive effect found after a short immersion period in a solution with copper ion concentration lower than 5 ug/L, with this effect not evident at higher copper concentrations.
机译：在不同的铜离子（Cu2 +）浓度下，研究了通过铝 - 锌涂层和海水表面上的环氧密封剂形成的复合抗腐蚀涂层的耐腐蚀性。通过超赖兹3D观察，SEM和能谱分析（EDS）的表面微观结构的特征在于。发现密封剂有效地屏蔽涂层表面并显着降低涂层的腐蚀速率。从电位偏振曲线和表面形态看，涂层表面上的被动膜的溶出过程是明显的。在涂层表面上发生局部腐蚀，并且表面腐蚀凹坑的数量和面积随溶液中铜的浓度而增加，表明涂层的耐腐蚀性降低。 32天浸泡后，样品的重量损失从4.5mg增加到5.4mg，涂层上的铜离子损伤来自表面的弱位置。通过动态电位偏振和电化学阻抗光谱（EIS）研究了涂层的电化学腐蚀行为，在溶液中的短浸入时间后发现铜离子浓度低于5ug / L的溶液后发现的阳性效果，这效果不明显在较高的铜浓度下。

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