Heptanoic acid adsorption on grafted palygorskite and its application as controlled-release corrosion inhibitor of steel
By A. Aït Aghzzaf, B. Rhouta, E. Roccab, A. Khalil, C. Caillet, R. Hakkou
Published in Journal of Power Sources
2014
Abstract
This study deals with the anchoring of heptanoic acid (HC7) as a corrosion inhibitor to palygorskite clay mineral originated from High Atlas of Marrakech (Morocco) beforehand grafted with 3-aminopropyltriethoxysilane (APTES) entities. Physicochemical characterizations (XRD, FTIR, TG-MS, zeta potential measurements) confirmed the success of the APTES-grafting to silanol sites of palygorskite fibers edges and the heptanoate anions bonding to terminal NH 3 + sites of grafted-APTES. Then, full-factorial design allowed optimizing the conditions of heptanoate adsorption. Preliminary electrochemical measurements revealed that functionalized grafted palygorskite (C7-APTES -Pal) can progressively release the heptanoate corrosion inhibitor in 0.1Â M NaCl solution to inhibit the steel corrosion processes.