不同腐蚀环境中几种典型涂层在玻璃钢表面的附着力研究

he adhesion force of several typical coatings on glass fiber reinforced plastics (FRP) and the relevant affecting factors was studied with methods of accelerated corrosion tests, adhesion testing and infrared spectroscopy. The adhesion force between FRP and coatings was related to the roughness and wettability of the FRP surface. The highest adhesion was obtained when the glass fiber clothes outcrop on the FRP surface. The FRP surface being polished with emery paper 240# showed higher adhesion for coatings rather than those with emery papers 60# and 600# respectively. In general, the adhesion of different coatings was related to the polarity of the functional groups in the coatings. Fluorocarbon resin coating which contains halogen- bonds of strong polarity showed higher adhesion. Compared with epoxy coating, both of the polyurethane coating and polysiloxane coating contain not only the ester- and ether-bonds similar to the epoxy coating, but also the urethane-, silicon oxygen- and other polar-bonds, leading to higher adhesion. Results of series comparative tests revealed that after immersion test in 3.5%NaCl solution at 40 the adhesion force between FRP and coatings decreased faster than those after salt fog test and damp heat test. Correspondingly, the infrared spectroscopy of the tested coatings showed that the molecular degradation in the coatings was more severe after immersion test than after salt fog test.