Corrosion inhibition of the self-assembled monolayer (SAM) of 1,2,3-Benzotriazole (BTAH) on virgin and sulfide-covered (tarnished) copper surfaces was studied using impedance, scanning electron microscopy, and Raman spectroscopy. SAM on preexisting sulfide film develops a more improved protection than on the virgin surface. Addition of HS− ions and non-ionic surface active agents (NIS) in SAM-forming solution deteriorate its properties. Raman spectroscopy established formation of polymeric film by adsorption of triazolate ion rather than triazole molecule. A scheme is suggested for improved inhibition of SAM on tarnished copper. Studies indicate a predominant cathodic control of corrosion reaction by the SAM film.

Subject
Ions, Metal surfaces, Protective films, Sulfide films, Impedance, Oxide surfaces, Nitrogen, Film formation, Corrosion protection, Sulfides, Copper, Electrolytes, Samples
Keywords:
copper, corrosion, electrochemical impedance spectroscopy, Raman spectroscopy, self-assembled monolayer
NACE International
2010
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