磷酸功能化有机无机SiO_2复合防腐涂层的结构及性能

Structural Characterization and Anticorrosion Properties of Phosphate Functionalized Hybrid Sol-Gel Coatings

采用溶胶-凝胶法,以γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)与正硅酸乙酯(TEOS)进行水解聚合,再与磷酸氢二(甲基丙烯酰氧乙基)酯(EGMP)进行自由基聚合,在马口铁上制备有机无机复合防腐涂层。通过傅里叶变换红外光谱表征涂层结构,扫描电镜研究涂层的微观表面,附着力测试研究涂层对基材的附着水平,极化曲线以及中性盐雾测试对复合薄膜的防腐性能测试,并探讨了EGMP量对涂层的性能的影响。结果表明,有机无机网络结构已形成,表面致密光滑,其附着力水平达到1级,n(KH570)∶n(EGMP)=4∶1时涂层的防腐性能最好。

Hybrid sol-gel films were deposited on tinplate substrates from sol prepared by hydrolysis and condensation reaction of 3-methacryloxypropyltrimethoxysilane （KH570） and tetraethylorthosilicate （TEOS） ,followed by radical polymerization with ethylene glycol methacrylate phosphate（EGMP）. The influence of the amount of EGMP on performance of the coating was investigated. Fourier transform infrared spectra（FFIR） was applied to characterize sols, scanning electron microscopy （SEM） was used to investigate the morphology of the hybrid coatings, adhesion tests were used to examine the adhesion of coating, and the corrosion behavior was investigated using potentiodynamic scan （PDS） and neutral salt spray test（NSST）. The results show that organic-inorganic network has been formed, the surface of coating is dense and smooth, the adhesion degree of coating is 1, and the best protection was achieved when the amount of KH570 was four times the molar number of EGMP in the coating.