Effect of MnO-4 anion inhibition on corrosion of (70%Cu-30%Zn)‎ brass in salt and basic solutions

الملخص EN

This research involves study effect of MnO-4 anion addition as inhibitor on the polarization behavior of (70 % Cu-30 % Zn) alloy in salt and basic medium (0.6 M NaCl and 0.6 M NaOH) by potentiostatic method where Tafel slopes and corrosion rate (Rmpy) and inhibition efficiency (El %) for each salt and basic environments were measured.

Result of the tests shows that the values of Tafel slopes and corrosion rate decreases with adding the MnO-4 anion in two solutions, the Inhibition efficiency of 70 % nCu-Zn30 % alloy in NaOH solution more than that observed in NaCl solution.

Which means that the basic media is more corrosive Cu-Zn alloy even after the addition of inhibitor?