Study of chloride ion concentration effect on the corrosion behavior of Alkoxysilane Coating on copper substrate

In this research, the effect of chloride ion concentration on the rate of corrosion protection efficiency of silane coating composition consisting of tetraethoxysilane (TEOS) and (3-mercaptopropyl) trimethoxysilane (MPTMS) were studied on a copper substrate. The silane solution was prepared by dissolving silane agents in a mixture of distilled water and ethanol and the coating on the copper substrates was applied by a simple dip-coating method. Fourier-transform infrared spectroscopy test showed that this coating has bonded well with the copper surface, and the coating has been formed. The protective properties of covered and uncovered copper specimens was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The Alkoxysilanes Coatings presented excellent inhibition effect to the copper corrosion and stability in water containing Cl−. Furthermore, the surface morphological study by scanning electron microscopy (SEM) showed that the ball like silica particles have been distributed on the copper substrate with particle sizes ranging from 75 to 250nm.