Copper-based materials are frequently intentionally or unintentionally exposed to chloride solutions. However, Cu is susceptible to corrosion in chloride media [2,3]. One approach to preventing Cu corrosion is the use of corrosion inhibitors. Among the corrosion inhibitors used in practice, benzotriazole (BTAH) was found to be widely employed for Cu protection in various media [2,4–7] (and the refs. therein). Mercapto compounds are also potentially effective Cu corrosion inhibitors [6,8,9]. Different studies using various experimental setups contribute to an understanding of how and why organic compounds inhibit the corrosion process [2,6]. However, inhibitor action is frequently reported only empirically without detailed examination.