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The efficiency of 5-(3,4-dimethoxyphenyl)-8,10-dimethoxy-1,3-dimethylpyrimido-[5,4-c]quinoline-2,4-dione(PQD) as corrosion inhibitor for Cu and α-brass in 1 M HNO 3 has been tested by weight loss (WL) and electrochemical techniques such as potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The calculated adsorption thermodynamic parameters indicated that the adsorption was a spontaneous, exothermic processdoi:10.20964/2017.04.57 fatcat:i434askpkneohdgow6l4oeiuwi