Environment-friendly metal corrosion inhibitors based on natural polymers (A review)

Keywords

corrosion, environmentally friendly inhibitors, natural polymers, polysaccha­rides, synergistic compositions, adsorption, inhibition efficiency.

Cite as

Korniy S. A., Zin I. M., Danyliak M.-O. M., and Rizun Yu. Ya. Environment-friendly metal corrosion inhibitors based on natural polymers (A review). Physico­chemical Mechanics of Materials. 2022. 58(5), 005-016.

Abstract

The promising environmentally safe corrosion inhibitors based on natural polymers are analyzed. The anti-corrosion effectiveness of biopolymers widely used in industry, in particular, chitin, starch and inulin, in various corrosive environments is considered. The main methods of researching the inhibitory efficiency of natural polymers on the surface of metals and alloys are described, including gravimetry, cyclic voltammetry, electrochemical impedance spectroscopy, adsorption isotherms, and quantum chemical approaches are described. It was established that the effectiveness of corrosion inhibition by polymers is influenced mainly by their concentration, molecular weight and structure, and the protection mechanism is generally caused by the adsorption due to the presence of polar functional groups in them, which causes the blocking of the corrosive medium access to the metal surface. The protective properties of natural gums and the main mechanisms of their inhibi­tion of carbon steels and aluminum alloys corrosion are considered. The data on the anti-corrosion effect of inhibitory synergistic compositions based on natural polymers, which are characterized by the synergism of the components, are given. It is shown that the creation of synergistic compositions is an effective way to improve the protective effect of polymers, reduce their concentration and diversify applications in corrosive environments.

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