ZrO_2掺杂电泳漆环氧涂层的制备及防护性能  

Preparation and Corrosion Performance of Electrophoretic Epoxy Coatings Doped with ZrO_2

作　　者：高媚[1] 伍廉奎[1] 胡吉明[1] 

机构地区：[1]浙江大学化学系,杭州310027

出　　处：《腐蚀科学与防护技术》2015年第2期109-115,共7页Corrosion Science and Protection Technology

基　　金：国家自然科学基金项目(51371159)资助

摘　　要：在电泳清漆环氧树脂中掺杂硝酸锆(Zr(NO3)4·5H2O),采用一步电泳法制备ZrO2掺杂改性的阴极电泳漆涂层,用于镀锌钢的腐蚀防护。红外测试表明,硝酸锆水解产物ZrO2与环氧树脂粒子共沉积构成阴极电泳涂层,并在涂层/金属界面发生富集。电化学阻抗谱、盐水浸泡和电化学扫描显微镜等结果表明,硝酸锆掺杂的电泳漆涂层防腐蚀性能得到大幅度提高。这可能是由于一方面掺杂形成的ZrO2填补了涂层本体的微孔缺陷,另一方面ZrO2在涂层与金属界面形成的富集层提高了涂层与金属之间的结合力。An electrophoretic ZrO2 doped epoxy coating on a galvanized steel plate was prepared in a bath of pigment-free waterborne epoxy paint plus an appropriate amount of zirconium nitrate pentahydrate. The examination with FTIR revealed that the hydrolysis product of zirconium nitrate pentahydrate could be co- electrodeposited with epoxy paint and the resulted ZrO2 particles enriched at the interface between the coating and the substrate. Then the corrosion protectiveness of the coatings was characterized by means of immersion test in Na Cl solution, electrochemical impedance spectroscopy and scanning electrochemical microscopy. The results indicated that the corrosion procetiveness of the electrophoretic epoxy coating was significantly improved by the doped ZrO2, which may be resulted from the fulfilling of micro-pores in the coating by ZrO2 component on one hand and the enhancement of adhesion provided by the enriched ZrO2 layer at the interface of coating/ substrate on the other hand.

关 键 词：金属防护 阴极电泳 环氧涂层 硝酸锆掺杂 镀锌钢 

分 类 号：TG174.4[金属学及工艺—金属表面处理]