ABSTRACTCorrosion inhibition of benzotriazole (BTA) for 70/30 brass in 0.1 M NaCl has been evaluated by means of electrochemical polarization and solution analysis.For comparision electrochemical polarization curves were also obtained with zinc and copper electrode. Brass and copper have the same electrochemical properties in BTA containing 0,1M NaCl solution. The anodic responses of the brass in 0.1 M. NaCl containing benzotriazole displays two potential regions. At the first anodic region between -1.0 and 0.0V (SCE), benzotriazole addition Cu(I)BTA film is formed by electron transfer . At the second region between 0.0 V and 0,8 V (SCE) copper is oxidized to Cu(I) oxide and Cu(II) hydroxide with the formation of CuCl film. Insoluble Cu(I)BTA film complex is also formed on these oxide/hydroxide films. Key Words: Corrosion, brass,copper, zinc, inhibition, benzotriazole, sodium chloride.