A new corrosion inhibitor for Cu60-Zn brass in 3% NaCl solution

The efficiency of 3-phenyl-1,2,4-triazole-5-thione (PTS) as brass corrosion inhibitor in 3% NaCl solution was investigated using electrochemical impedance spectroscopy gravimetric and potentiodynamic measurements. The surface were analyzed by scanning electron microscopy and energy dispersive x-ray analysis (EDAX).The results showed that the examined compound act as a mixed inhibitor. PTS inhibiting efficiency increased by augmenting its concentrations and by lengthening the testing time. At 1 mM concentration the polarization of the anodic branch at high current density is believed to be due to the resistance of the formed film. The EDAX analysis showed that the protection of brass by PTS is due to the formation of chemisorbed monolayer film. It growth involved precipitation of Cu and Zn ions may be as highly insoluble Cu-ZnPTS complexes at the solid/liquid interface