Abstract
The corrosion and corrosion inhibition of Mg/Mn alloy in 3.5% NaCl solutions by 5-(3-aminophenyl)-tetrazole (APT) after different exposure intervals have been studied. The work was carried out using conventional electrochemical, impedance, and gravimetric measurements and complemented by scanning electron microscopy (SEM) and X-ray analyzer (EDX) investigations. Cyclic polarization, chronoamperometry and electrochemical impedance spectroscopy measurements after 60 min and 6 days indicated that the corrosion of Mg/Mn alloy decreases with increasing exposure time. This effect was significantly enhanced with the presence and upon the increase of APT molecules in the chloride solution. Weight loss tests after varied exposure periods (5-25 days) showed that the weight loss of the alloy increases and the corrosion rate decreases with time. APT provided an inhibition efficiency of circa 55% at 10 M-3 increased to about 91% with 5x10 (3) M in 25 days.