聚苯胺/磷酸锌/聚硅氧烷复合涂层自修复和耐蚀性能初探  

Self-healing Function and Corrosion Resistance of Polyaniline/Zinc Phosphate/Polysiloxane Composite Coatings

作　　者：甘志宏 廖圣智 王浩伟 余剑英[2] 邵亚薇[3] 

机构地区：[1]中国特种飞行器研究所结构腐蚀防护与控制航空科技重点实验室,湖北荆门448035 [2]武汉理工大学材料科学与工程学院,武汉430070 [3]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001

出　　处：《表面技术》2017年第5期224-230,共7页Surface Technology

基　　金："十二五"空装预研项目资助(402060104)~~

摘　　要：目的初步探索由聚苯胺/磷酸锌有机-无机复合钝化填料和环氧-聚硅氧烷树脂制备的自修复涂层的修复和防腐性能。方法采用微区交流阻抗技术(LEIS)、扫描电子显微技术(SEM)和电化学阻抗技术(EIS),研究了聚苯胺/磷酸锌/聚硅氧烷复合涂层的防腐性能和在人工损伤部位的修复功能。结果由微区电化学阻抗和电化学阻抗测试可知,环氧-聚硅氧烷清漆具有自修复和优异的耐蚀性能;偶联剂处理的聚苯胺/磷酸锌有机-无机复合钝化填料(HCE),可显著提升环氧-聚硅氧烷涂层的自修复和耐蚀性能。当HCE的添加量为0.3%(以占环氧-聚硅氧烷涂料质量的百分比计)时,涂层的自修复和耐蚀性能最佳,缺陷部位修复后的阻抗值最大达到70 k?,是环氧-聚硅氧烷清漆的9倍。涂层阻抗值随浸泡时间的延长而增加,浸泡3750 h时,涂层阻抗值增至10^(11)?·cm^2。结论当涂层产生缺陷时,一方面聚苯胺/磷酸锌有机-无机复合填料发生氧化还原反应,生成新的氧化膜;另一方面,聚苯胺与环氧-聚硅氧烷树脂发生交联固化反应,在基体缺陷处成膜,提高了涂层的致密性;二者协同作用使HCE3涂层试样具有最佳的耐蚀性能和自修复功能。The work aims to explore healing performance and corrosion resistance of self-healing coating made of polyaniline/zinc phosphate organic/inorganic composite passive filler and epoxy-polysiloxane resin preliminarily. The healing function in parts subject to artificial damage and corrosion resistance of the composite coatings were evaluated with localized electrochemical impedance spectroscopy （LEIS）, scanning electron microscopy （SEM） and electrochemical impedance spectroscopy （EIS）. The localized electrochemical impedance spectroscopy and electrochemical impedance spectroscopy tests indicated that the epoxy-polysiloxane clear coating exhibited self-healing function and excellent corrosion resistance. The polyaniline/zinc phosphate organic-inorganic composite passive filler treated with coupling agent could significantly improve self-healing performance and corrosion resistance of the epoxy-polysiloxane coating. Provided that 0.3% （as a percentage in the mass of epoxy-polysiloxane coating） of HCE was added, the coating exhibited best self-healing function and corrosion resistance, impedance value was up to 70 kΩ after the defective part was healed, which was 9 times as high as that of epoxy-polysiloxane varnish. The impedance value increased as the soak time prolonged, and would amount to 10^11Ω·cm^2 after the sample has been soaked for 3750 h. When the coating is damaged, polyaniline/zinc phosphate organic-inorganic filler subject to redox reaction produces oxidation film; polyaniline has crosslinking-solidifying reaction with epoxy-polysiloxane resin, thus forming film in defective parts of the substrate and improving compactness of the coating. Therefore, the two jointly contribute to the best corrosion resistance and self-healing function of HCE3 coating sample.

关 键 词：聚苯胺/磷酸锌有机-无机复合钝化 自修复 改性聚硅氧烷涂层 微区电化学阻抗技术(LEIS) 交流阻抗技术(EIS) 

分 类 号：TG174[金属学及工艺—金属表面处理]