Corrosion inhibition of aluminum in hydrochloric acid by 2-acetylpyridine thiosemicarbazone derivatives. – B. I. Ita, M. Nsi and U. S. Simon
The corrosion inhibition of aluminum in HCl medium by 2-acetylpyridine-(4-methyl-iso-methylthiosemicarbazone) (AMSM)and 2-acetylpyridine-(4-methyl-iso-ethylthiosemicarbazone) (AMSE) has been studied using weight loss and hydrogen evolution techniques. The inhibition efficiency of the compounds was tested for five concentrations in the range 1 x 10-5 to 5 x 10-4M. The AMSM exhibited a higher inhibition efficiency than AMSE. Generally, inhibition was observed to decrease with decreasing temperature. A first order type of mechanism has been deduced from the kinetic treatment of the results. The process of inhibition was attributed to physisorption. The difference in the inhibition behaviour of the two compounds is explained in terms of the difference in their molecular structures.
Keywords: Inhibition, thiosemicarbazone derivatives, aluminum, corrosion.