Glycerin-Grafted Starch as Corrosion Inhibitor of C-Mn Steel in 1 M HCl solution

Abstract

C-Mn steels, commonly employed in structural applications, are often exposed to near-neutral aerated environments and hence subjected to general corrosion. In broader contexts, for example during pickling, acidizing treatments, or acid-releasing processes, where steel comes in contact with more aggressive solutions, the use of corrosion inhibitors is a supplementary strategy to cathodic protection and/or coating. This work focuses on the C-Mn steel corrosion protection in the presence of HCl, either as process fluid or by product. In order to avoid the toxicological issues related to conventional synthetic products, a bio-copolymer containing glycerin-grafted starch, synthesized by modification of maize starch, was studied as a “green” corrosion inhibitor by the weight loss method and electrochemical techniques (open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy). Corrosion-related parameters, such as inhibitor concentration and temperature, were varied and optimized to characterize the corrosion process. Results showed that inhibition efficiency increases with increasing bio-copolymer concentration, reaching a maximum of 94%at the concentration of 300 mg L−1. The kinetic and thermodynamic parameters were determined and discussed. The obtained values of corrosion potential and corrosion current density, Ecorr and icorr, obtained by potentiodynamic polarization, are in agreement with the weight loss method. The corrosion current densities decrease when the concentration of the inhibitor increases.

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Corrosion inhibitors for carbon steel: A review

“…and this solution is used as corrosion inhibitor for CS against 1 M HCl solution. [228] The temperature has a valuable impact on the corrosion process and inhibition efficiency. [229] Glycerol modified starch as shown in figure 15 gives a maximum effectiveness of 94 % with an inhibitor concentration of 300 mg/L, at optimal temperature of 323 K. Generally, as the temperature increases, the corrosion rate increases in the absence of a corrosion inhibitor but the dissolving of CS is greatly slowed when glycerol modified starch bio-copolymer is added as corrosion inhibitor.…”

“…Due to these modifications this corrosion inhibitors can be used as green corrosion inhibitor and can be used in optimum concentration without affecting the natural environment and human health. [228] Different parts of plant such as leaves, fruits, seed, flowers act as good corrosion inhibitors in corrosive media as shown in table 5 (see page 42). [12,230] 2.5.4.…”

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“…Lahrour et al [3] investigated the use of glycerin-grafted starch as a bio-copolymer working as a corrosion inhibitor for the protection of C-Mn steel, in the presence of HCl, by electrochemical techniques and the weight loss method. The obtained results revealed that inhibition efficiency enhances with increasing bio-copolymer concentration, reaching a maximum of 94%.…”