Abstract
The effects of 5-(3-aminophenyl)-tetrazole (APT as a corrosion inhibitor for Mg-Mn alloy after its immersion in naturally aerated stagnant Arabian Gulf water (AGW) for 1 h and 150 h have been reported. The study has been carried out using a combination of electrochemical and gravimetric measurements along with scanning electron microscope (SEM) and X-ray energy dispersive (EDX) investigations. Electrochemical measurements showed that the corrosion of Mg-Mn alloy in AGW decreases with increasing exposure time as well as in the presence of APT and the increase of its concentration. Weight-loss tests after varied exposure intervals proved that the corrosion rate of the alloy decreases with increasing time and APT content. The SEM and EDX investigations revealed that APT molecules inhibit the corrosion of Mg through repairing the weak areas on its surface, which leads to increasing the corrosion resistance for the alloy against the corrosive attack of AGW.