| 摘要: |
| 针对防污涂层中含铜防污剂对铝合金基体的腐蚀影响问题，采用动电位极化曲线和腐蚀失重的方法，研究5083铝合金在含不同浓度Cu2+的3.5% NaCl溶液中的电化学腐蚀行为，采用电化学交流阻抗方法研究自抛光防污涂层和不含铜防污剂的丙烯酸树脂基涂层对铝合金的屏蔽性能和腐蚀情况。结果表明，溶液中的Cu2+浓度低于70 μg/L时，对5083铝合金的腐蚀速率影响不大，当Cu2+浓度超过此临界值时铝合金的腐蚀会显著加速；直接涂刷防污涂层的铝合金在3.5% NaCl溶液中浸泡4天就发生腐蚀，说明涂层中的防污剂Cu2O与NaCl溶液反应生成的Cu2+向涂层内部渗透对铝合金基体的腐蚀有负面影响。 |
| 关键词: 防污涂层 氧化亚铜 5083铝合金 腐蚀 |
| DOI：10.11933/j.issn.1007-9289.2015.05.017 |
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| Influence of Copper Release from Antifouling Coating on Corrosion of Aluminum Alloy Substrate |
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CAO Jingyi, ZHANG Hanlu, SUN Dongming, TANG Yuming, ZUO Yu1,2
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1. Naval Coatings Analysis and Test Center, Naval Equipment Research Institute;2. College of Materials Science and Engineering, Beijing University of Chemical Technology
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| Abstract: |
| To understand the influence of copperbased antifouling agent in antifouling paint on Al alloy substrate, the potentiodynamic polarization curve and weight loss tests were used to study the electrochemical corrosion behaviour of 5083 Al alloy in 3.5% NaCl solution with different contents of Cu2+. Electrochemical impedance spectroscopy method was performed to investigate the coating shielding properties of copperbased selfpolishing antifouling paint and acrylic resin base paint without antifouling agent on Al alloy substrate and the corrosion of substrate. The results show that when the content of Cu2+ is lower than 70 μg/L, there is slight effect on the corrosion rate of 5083 Al alloy, while above 70 μg/L, strong acceleration of corrosion of Al alloy takes place. When the antifouling paint is coated directly on Al alloy, the substrate suffers corrosion after immersed in 3.5% NaCl solution for four days, demonstrating that the penetration of Cu2+ into the paint, which is produced through the reaction between pigment Cu2O in antifouling paint and NaCl solution, has a negative effect on the corrosion of 5083 Al alloy substrate. |
| Key words: antifouling coating cuprous oxide 5083 aluminum alloy corrosion |
