防腐蚀涂层在海水压力交变环境下的性能变化及对比研究

Performance Change and Comparative Study of Anti-corrosive Coatings in Seawater Environment with Alternating Pressure

本文对3种防腐涂料进行了模拟深海压力交变环境下的防腐试验,对涂层吸水率、附着力、表面形貌、耐阴极剥离性及抗氯离子渗透性进行了测试。试验结果表明,在压力交变环境下,涂层受到压缩与膨胀的相互作用,涂层内部的孔隙增大,氯离子、水和氧气等腐蚀介质较常压下更容易渗透进入涂层或渗入到涂层与底材的连接界面,使涂层的吸水过程加快并导致涂层阴极剥离及抗氯离子渗透性能大大降低。从涂层表面形貌上看,腐蚀介质渗入和聚积导致了涂层内可溶物质析出,并随着涂层内部传输路径扩散到涂层表面,最终出现涂层开裂等现象。

Three anti- corrosive coatings were tested in alternating pressure condition simulating deep sea environment and water absorption,adhesion,surface morphology,cathodic disbonding resistance and resistance to chloride ion of the coatings were studied. The research showed that alternating pressure enlarged the porosity of the coating,so chloride ion,water and oxygen were easier to permeate into the coating or the interface of the coating and base metal,degrading the resistances to cathodic disbonding and chloride ion leaching. From the perspective of the surface morphology of the coating,the diffusion and accumulation of the corrosive media in the coating could contribute to the precipitation of soluble substances which would diffuse to the surface of the coating,resulting in the cracking of the coating.