Benzo-hydroxamic acids (BHA) are investigated as potential copper corrosion inhibitors in chloride solution. The BHAs investigated were : p-chloro-benzo-hydroxamic (p-Cl-BHA), o-chloro-benzo-hydroxamic acid (o-Cl-BHA), p-nitro-benzo-hydroxamic acid (p-N-BHA) and o-methyl-benzo-hydroxamic acid (o-M-BHA). Electrochemical measurements, potentiostatic polarization and ac impedance spectroscopy were carried out to evaluate the inhibition effect of the investigated BHAs. An Electrochemical Quartz Crystal Microbalance (ECQM) was used to measure electrode corrosion and inhibitor adsorption or layer formation processes. A poorly soluble layer consisting of the inhibitor and copper corrosion products is proposed to account for the protective effect in chloride solutions.