Modification of silane based coating with bisphenol A, isosorbide and resorcinol for anticorrosive application

(3-glycidoxypropyl) trimethoxysilane (GPTMS) and tetraethyl orthosilicate (TEOS) based coating has been prepared by sol-gel method which has oxirane ring as functionality present in the structure. Since the GPTMS has free oxirane ring hence to modify the sol through this oxirane ring,-OH functional precursor has been added into it. The performance of bisphenol A, isosorbide and resorcinol solely and in combination as bisphenol-isosorbide, bisphenol A-resorcinol and Isosorbide-resorcinol has been compared for such modification. It is observed that in anticorrosive properties, bisphenol A has given the best result. The comparative result has been observed with bisphenol-resorcinol combination. The result has been proven by salt spray and EIS study. In EIS study it is observed that Bisphenol A based coating and Bisphenol AResorcinol combination has shown the impedance value > 10 Gohms. In mechanical properties, the hardness of bisphenol A and resorcinol based system observed to be higher. This is due to the aromatic linkage has been introduce in the system which tends to improve the hardness performance of the system.