Corrosion inhibition of aluminium alloy by environment-friendly composition based on gum arabic and zinc acetate

The inhibitory properties of an environment-friendly composition based on poly­saccharide – gum arabic and acetic acid salt – zinc acetate to increase the corrosion resis­tance of Д16T aluminium alloy in a neutral environment were investigated by electroche­mical and gravimetric methods. It was established that the inhibitory efficiency of the com­position increased with increasing concentration, and was maximally effective at 2 g/l of each component. The protective effect of the composition can be associated with the adsorption capacity of zinc acetate and gum arabic, due to the presence of hydroxyl and carboxyl groups in them, as well as the ability of Zn2+ cations to interact with OH– anions, with the subsequent formation of zinc hydroxides, which blocks cathode areas and slows down corrosion processes. It is shown that the degree of protection of the Д16T aluminium alloy after 168 h of exposure in a 0.1% NaCl solution is 86…89%, which indicates the effective protective effect of the selected inhibitory composition.