Corrision inhibition of an aluminum alloy in a chloride-containing environment by a composition based on dextrin and sodium isoascorbate

Using the methods of electrochemical impedance spectroscopy, scanning electron micro­scopy, and energy dispersive X-ray analysis, the corrosion inhibition of aluminum alloy in a neutral chloride-containing environment with a composition containing equal weight amounts of dextrin and sodium isoascorbate was investigated. An approximately 20-time increase in the charge transfer resistance of the aluminum alloy due to the protective effect of the inhibitory composition at its optimal concentration was established. A dense adsorption organic film was found on the surface of the metal in the inhibited solution. The degree of metal corrosion protection by the dextrin-isoascorbate composition exceeds 90%. The practical effect of the research is the possibility of obtaining an environment friendly inhibitory composition based on renewable plant materials for corrosion protec­tion of aluminum alloy constructions.