A comparative analysis on the effects of sodium nitrate and hexamine on the corrosion of aluminium alloy in an acidic environment
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Abstract
Description
Despite aluminium and its alloys being relatively resistant to corrosion reaction as a
result of their passivating tendencies, aluminium alloys usually succumb to acidic
attacks resulting in mostly pitting corrosion. This study is focused on comparing the
efficiency of sodium nitrate with that of hexamine on the acid
corrosion of aluminium when used individually as inhibitors in 1 M Hydrochloric acid.
The gravimetric method was used for the corrosion study. Sodium nitrate was found to
have higher inhibitor efficiency of 94% compared to that of hexamine (44%), positioning
the former as a better inhibitor for aluminium alloy in 1 M HCl. ΔGadso was evaluated
and the obtained Standard free energy of adsorption were in the range of −13 to
−17 kJ/mol for NaNO3 and −6 to −12 kJ/mol for hexamine, signifying
the physisorption mode of adsorption
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology