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将γ-(2,3环氧丙氧)丙基三甲氧基硅烷(GPTMS)掺杂到不含颜料的水性环氧树脂中,通过一步电泳法在镀锌钢表面构建得到硅烷掺杂的电泳漆涂层。采用电化学阻抗谱和扫描电化学显微镜技术研究了涂层体系的防护性能,并结合其它手段开展了机理研究。结果表明,有机硅烷的加入能够显著提高环氧电泳漆涂层在腐蚀介质中的防护性能,硅烷掺杂抑制环氧涂层的吸水和溶胀。提出了硅烷掺杂电泳漆涂层的如下防护机理:一方面,GPTMS的掺杂增加了涂层的交联程度;另一方面,电泳过程中促进GPTMS组分在金属与涂层界面的优先沉积形成富集层,从而提高了基体与涂层间的结合力。
Γ- (2,3-epoxypropyl) propyltrimethoxysilane (GPTMS) was doped into pigment-free water-borne epoxy resin, and one-step electrophoresis was used to build silane-doped electrophoresis on the surface of galvanized steel Paint coating. Electrochemical impedance spectroscopy and scanning electrochemical microscopy were used to study the protective properties of the coating system. The mechanism was also studied by other means. The results show that the addition of organosilane can significantly improve the protective performance of the epoxy electrophoretic coating in corrosive media. Silane doping inhibits water absorption and swelling of the epoxy coating. The following protective mechanisms were proposed for the silane-doping electrophoretic coating: on the one hand, the doping of GPTMS increased the degree of crosslinking of the coating; on the other hand, the preferential deposition of the GPTMS component at the metal-coating interface was facilitated during the electrophoresis Forming a rich layer, thereby enhancing the bond between the substrate and the coating.