Kinetics of corrosion inhibition of aluminum in acidic media by water-soluble natural polymeric chondroitin-4-sulfate as anionic polyelectrolyte inhibitor

Refat M Hassan; Samia M Ibrahim; Hideo D Takagi; Suzan A Sayed

doi:10.1016/j.carbpol.2018.03.066

Kinetics of corrosion inhibition of aluminum in acidic media by water-soluble natural polymeric chondroitin-4-sulfate as anionic polyelectrolyte inhibitor

Carbohydr Polym. 2018 Jul 15:192:356-363. doi: 10.1016/j.carbpol.2018.03.066. Epub 2018 Mar 22.

Authors

Refat M Hassan¹, Samia M Ibrahim², Hideo D Takagi³, Suzan A Sayed⁴

Affiliations

¹ Chemistry Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt. Electronic address: rmhassan2002@yahoo.com.
² Chemistry Department, Faculty of Science, Assiut University, New Valley Branch, El-Kharja, 72511, New Valley, Egypt.
³ Department of Chemistry, Graduate School of Science, Research Center for Material Sciences, Nagoya, 464-01, Japan.
⁴ Chemistry Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt.

PMID: 29691031
DOI: 10.1016/j.carbpol.2018.03.066

Abstract

Corrosion inhibition of aluminum (Al) in hydrochloric acid by anionic polyelectrolyte chondroitin-4-sulfate (CS) polysaccharide has been studied using both gasometrical and weight-loss techniques. The results drawn from these two techniques are comparable and exhibit negligible differences. The inhibition efficiency was found to increase with increasing the inhibitor concentration and decreased with increasing temperature. The inhibition action of CS on Al metal surface was found to obey both of Langmuir and Freundlich isotherms. The factors affecting the corrosion rates such as the concentration and geometrical structure of the inhibitor, concentration of the corrosive medium, and the temperature were examined. The kinetic parameters were evaluated and a suitable corrosion mechanism consistent with the results obtained is discussed.

Keywords: Aluminum; Chondroitin-4-sulfate; Corrosion; Inhibitors; Kinetics.