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The corrosion behaviour of AZ91 alloy was investigated in 0.1M hydrochloric acid solution at different temperatures 20-50○C. The study was done by weight loss technique and electrochemical method, using Tafel polarization technique. Additive concentration increases the inhibition effectiveness. The results show that the protection efficiency P% followed the sequence ethylenediamine (EDA) > diethylamine (DEA) > ethylamine (EA). The influence of temperature on the corrosion behaviour of AZ91 alloy in 0.1M HCl solution was studied between 20○C and 50○C both with and without inhibitors. The inhibition efficiencies obtained from the two employed methods (weight loss technique and potentiodynamic polarization technique) are nearly closed. From the obtained data, it was found that the inhibition efficiency increases with increasing the inhibitor concentration until the optimum one. Adsorption of the inhibitors on AZ91 alloy surface was found to obey Langmuir's adsorption isotherm. SEM examination of AZ91 alloy surface revealed that these inhibitors prevented AZ91 from corrosion by adsorption on its surface to form a protective film, which acts as barrier to aggressive agents.
Ahmed et al. (Sun,) studied this question.