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 theprocess of corrosion of brass in aqueous solution. thus the inhibiting substances must usedto reduce the dissolution of these metallic materials. the present work aimed to study theeffect of 3-phenyl-1,2,4-triazole-5-thione (pts) on cu/zn brass corrosion in 3% naclsolution. 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 usingelectrochemical impedance spectroscopy and potentiodynamic measurements.the resultsshowed that the pts is an excellent inhibitor. the inhibiting efficiency increased by anincrease of its concentration. at 10-3 m the important polarization resistance value of theanodic branch at high current density is believed to be due to the resistance of the inhibitorfilm formed .the spectroscopic techniques showed that the pts can be also used as aninhibitor of the dezincification of the brass in the same solution. consequently, we haveconcluded that the pts has good inhibiting effect to stop brass dezincification phenomenon.