Effect of 1, 2, 3-benzotriazole on the corrosion properties of 316L stainless steel in synthetic tap water

This study examines the effect of the benzotriazole on the corrosion properties of 316L stainless steel in synthetic tap water. Electrochemical tests, surface analyses and quantum study were conducted for evaluating corrosion behavior and adsorption mechanism. In case of stainless steel in the synthetic tap water, the adsorption layer of benzotriazole is not uniform due to the low adsorption. The benzotriazole is preferred to ionic state in alkaline condition like synthetic tap water. Thus, the formation of metal-benzotriazole complex was difficult, and which confirmed in FT-IR analysis. The ionic state of benzotrizole in alkaline environment caused the electrostatic repulsion force and the strong tendency of donating electron obstructed the adsorption of ionic benzotirzole. In addition, the lack of d-orbital of Cr made hard to adsorption of the benzotrizle on the stainless steel. This non-uniform adsorption layer of benzotriazole on the stainless steel surface induced the localized defect sites which decrease the pitting resistance of stainless steel.