Evaluation of silanes as corrosion resistant coatings for Cu-alloy in Sea water

Abstract

Three different Silanes were identified which are suitable for coating the copper alloy condenser tubes as Silane-I, Silane-II and Silane-III. These silanes are dissolved in Isopropanol / Methanol solvent and the PH is suitably adjusted with Glacial Acetic acid. The silane solutions of specified concentrations are then coated on the copper alloy samples and then dried. Then the coated samples are evaluated by electrochemical techniques like Tafel polarisation, Impedance technique etc in Sodium chloride solution. The corrosion resistances observed in all the cases without and with Silane coating are reported. Silane II worked more efficiently on all the three alloys. The impedance values also confirmed this.