工艺条件对丙烯酸酯-苯胺共聚乳胶涂层防腐性能的影响

Influence of Process Conditions on Anticorrosive Properties of Acrylate-Aniline Copolymer Emulsion Coatings

在丙烯酸酯乳液中引入苯胺单体,采用原位乳液聚合法制备了丙烯酸酯-苯胺共聚乳液,分析了共聚机理,详细研究了反应温度、反应时间、共聚乳液中乳化剂种类、乳化剂用量、引发剂与苯胺的物质的量比[n(APS)∶n(An)]等条件对共聚乳液性能及乳胶涂层防腐性能的影响。对制备的共聚乳胶涂层进行了电化学阻抗谱(EIS)、塔菲尔曲线(Tafel)、开路电位(OCP)等测试,通过扫描电子显微镜(SEM)和X射线能谱(EDS)对腐蚀表面进行了分析。结果表明:丙烯酸酯-苯胺共聚乳胶涂层可以使金属基材表面形成钝化膜,且当反应温度为10℃,反应时间为5 h,乳化剂十二烷基苯磺酸钠(SDBS)用量占乳液总质量的2%,引发剂与苯胺的物质的量比为1.5∶1时,共聚乳液的性能及其乳胶涂层防腐蚀性能最佳。

Acrylate-aniline copolymer emulsion was prepared through in situ emulsion pol- ymerization by introducing aniline monomer into acrylate emulsion. The copolymerization mechanism and influence of reacting temperature, reacting time, the kind of emulsifier, the content of emulsifier, the molar ratio of initiator and aniline [ n（APS） ：n（An） ] on properties of copolymer emulsion and anticorrosive properties of emulsion coatings were studied. The e- mulsion coatings were characterized by electrochemical impedance spectroscopy （EIS） , Tafel curves （Tafel） and open circuit potential （0CP）. The corrosion surface was analyzed by scan- ning electron microscope （SEM） and energy dispersive spectrometer （EDS）. The results indi- cated that the copolymer emulsion had better properties and the copolymer emulsion coatings had better anticorrosive properties when the react temperature was 10 ~C, the react time was 5 h, using sodium dodecylbenzene sulfonate （SDBS） as emulsifier, the mass fraction of emulsitier was 2% （based on total mass of emulsion）, and n（APS） ：n（An） was 1.5：1.