Abstract
The performance of PVAc as a safe inhibitor for corrosion of aluminium in 2 M H2SO4 and 0.5 M HCl solution at varying temperatures was investigated by weight loss, polarization measurement and computational technique. Weight loss measurements showed that PVAc exhibited excellent inhibitory character within the studied environment and efficiency of inhibition increased with increasing concentration of PVAc, but decreased with rise in temperature. Also, it is observed that aluminium displayed higher susceptibility to dissolution in the hydrochloric compared to sulphuric acid. Results of free energy of adsorption suggest physical adsorption. The adsorption of PVAc on the aluminium surface followed Langmuir adsorption isotherm, thus showing evidence of physisorption mechanism. Polarization results revealed that PVAc functions as a mixed-type inhibitor with absolute control of the anodic reaction. Results of computational technique showed the apparent correlation between corrosion inhibition efficiency and electronic molecular structure regarding frontier molecular orbital theory.
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