Abstract
Chitosan is one of the important biopolymers and it is extracted from exoskeletons of crustaceans in sea food waste. It is a suitable eco-friendly carbon steel corrosion inhibitor in acid media; the deacetylation degree of prepared chitosan is more than 85.16 %, and the molecular weight average is 109 kDa. Chitosan was modified to 2-N,N-diethylbenzene ammonium chloride N-oxoethyl chitosan (compound I), and 12-ammonium chloride N-oxododecan chitosan (compound II) as soluble water derivatives. The corrosion inhibition efficiency for carbon steel of compound (I) in 1 M HCl at varying temperature is higher than for chitosan and compound (II). However, the antibacterial activity of chitosan for Enterococcus faecalis, Escherichia coli, Staphylococcus aureus, and Candida albicans is higher than for its derivatives, and the minimum inhibition concentration and minimum bacterial concentration of chitosan and its derivatives were carried out with the same strain.
Highlights
Acid solutions are commonly used in the chemical industry to remove mill scales from metallic surfaces
It is a suitable eco-friendly carbon steel corrosion inhibitor in acid media; the deacetylation degree of prepared chitosan is more than 85.16 %, and the molecular weight average is 109 kDa
The adsorbed hydrogen atoms block the cathodic area, while the increase in the solution temperature causes desorption of hydrogen. Such hydrogen desorption leads to an increase in the cathodic area and increases the corrosion rate
Summary
Acid solutions are commonly used in the chemical industry to remove mill scales from metallic surfaces. Most acid inhibitors are organic compounds containing oxygen, nitrogen and sulfur These compounds are adsorbed onto the metallic surface blocking the active corrosion sites. Chitosan exhibits various biological activities and biomedical applications including excellent biocompatibility, biodegradability, osteoconductivity, antimicrobial properties, a flocculating agent, a drug delivery vehicle, an immobilization and encapsulation agent of toxic heavy metals, and in cosmetics [12, 13]. It is a linear polybase electrolyte having a highly positive (C) charge density because it includes an amine group [14]. With such a cationic property together with several hydroxyl groups it is consider a good corrosion inhibitor of steel
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