Synthesis and evaluation of corrosion inhibiting activity of new molecular hybrids containing the morpholine, 1,4-naphthoquinone, 7-chloroquinoline and 1,3,5-triazine cores

Westphal, Regina, de Souza Pina, Jorge Welton, Franco, Juliana Panceri, Ribeiro, Josimar, Delarmelina, Maicon ORCID: https://orcid.org/0000-0002-6414-552X, Fiorot, Rodolfo Goetze, de Mesquita Carneiro, José Walkimar and Greco, Sandro José 2020. Synthesis and evaluation of corrosion inhibiting activity of new molecular hybrids containing the morpholine, 1,4-naphthoquinone, 7-chloroquinoline and 1,3,5-triazine cores. Advances in Chemical Engineering and Science 10 (4) , pp. 378-398. 10.4236/aces.2020.104024

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Abstract

Three molecules containing morpholine, 1,4-naphthoquinone, 7-chloroquinoline and 1,3,5-triazine cores, scaffolds with recognized anti-corrosive activity, were synthesized and had their anticorrosive activity evaluated through potentiodynamic polarization and electrochemical impedance studies. Both studies were conducted in a simulated production water medium containing 150,000 mg·L-1 Cl- and 5 mg·L-1 S2-. Corrosion inhibition efficiency ranged from 67% - 86%, amongst which the naphthoquinone-containing derivative (compound 1) was the most effective. These compounds act through formation of a protective film on the surface of AISI 316 stainless steel. Investigation of the molecular properties of the prepared inhibitors by DFT calculations revealed that the LUMO energy and chemical hardness of the molecules can be directly correlated with their inhibition efficiency.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Additional Information:	This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.
Publisher:	Scientific Research Publishing
ISSN:	2160-0392
Date of First Compliant Deposit:	9 March 2021
Date of Acceptance:	19 September 2020
Last Modified:	04 May 2023 08:25
URI:	https://orca.cardiff.ac.uk/id/eprint/139370

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