Benzotriazole (BTAH) is a very effective corrosion inhibitor for copper and its alloys in both water and in oils. BTAH is introduced as a corrosion inhibitor in oil based systems over a broad temperature range starting from room temperature (lacquers and varnishes) to temperatures above 100 C (transformer ,engine oils).BTAH is strongly adsorbed onto copper surfaces and forms thick layers on the surface. It is now believed that this thick layer offers protection from corrosion by shielding the surface from corrosive species.The key objective of this proposal is to study how the structure of this passivating BTAH layer changes with temperature as any structural changes in the layer will significantly affect the corrosion inhibition efficiency of BTAH.