Corrosion Inhibition and Dezincification of Brass in % 3 NaCl Solution by 3-Phenyl-1.2.4- Triazol-5-Thione

The dezincification of brass is a problem that has often been encountered in the process of corrosion of brass in aqueous solution. Thus the inhibiting substances must used to reduce the dissolution of these metallic materials. The present work aimed to study the effect of 3-phenyl-1,2,4-triazole-5-thione (PTS) on Cu/Zn brass corrosion in 3% NaCl solution. This latter is prepared with a new method in our laboratory. The efficiency of (PTS) as brass (alloy 60 Cu-Zn) corrosion inhibitor in %3 NaCl solution was investigated using electrochemical impedance spectroscopy and potentiodynamic measurements.The results showed that the PTS is an excellent inhibitor. The inhibiting efficiency increased by an increase of its concentration. At 10-3 M the important polarization resistance value of the anodic branch at high current density is believed to be due to the resistance of the inhibitor film formed .The spectroscopic techniques showed that the PTS can be also used as an inhibitor of the dezincification of the brass in the same solution. Consequently, we have concluded that the PTS has good inhibiting effect to stop brass dezincification phenomenon.