铝锆有机金属偶联剂对环氧铝粉涂料的改性研究

Study of Al-rich Epoxy Coatings Modified with Aluminium Zirconium Organic Metal Coupling Agent

采用铝锆有机金属偶联剂对鳞片状铝粉进行表面改性,将改性后的铝粉用作防锈颜料制备了一种环氧铝粉涂料.能量散射谱(EDS)和扫描电镜(SEM)照片显示改性后的铝粉分散性能得到改善,涂层更加平整、致密,物理屏蔽性能提高.涂层体系在3.5%NaCl溶液中的电化学阻抗谱(EIS)测试表明,浸泡初期使用改性铝粉制备的涂层均具有更高的阻抗,对基体具有较好的防护作用.浸泡52 d后未改性的涂层基本上失去了对基体的保护作用,改性涂层的阻抗值仍可达到106Wcm2,涂层对基体仍具有一定的保护作用.当偶联剂的质量分数为2.5%时,环氧铝粉涂层的防护性能最好.

The surface of Al flake powder was modified with aluminum zirconium organic metal coupling agent. The resulting flakes were incorporated into epoxy coatings as anticorrosive pigments. The energy dispersive x-ray （EDS） tests and scanning electron microscopy （SEM） tests indicated that the coupling agent improved the dispersion of Al flake powder, so that the flatness, adherent and shielding effect of the coatings was greatly enhanced. The electrochemical impedance spectroscopy （EIS） results of coatings in 3.5 % NaCl solution showed that, in the initial immersion stage the coatings exhibited larger impedance values and better corrosion resistance after modification. In addition, after 52 days of immersion, the coatings before modification had no corrosion resistance, the coatings after modification still displayed good corrosion protection with an impedance value of 10^6Ω·cm^2 , and the epoxy coatings exhibited the highest protective performance when 2.5 % of the coupling agent was used.