Work

Adsorption and protective properties of alkylmalonic acids’ derivatives on zinc in a neutral chloride solution

Year: 2024

Type: article

Abstract: The adsorption of sodium malonate and its alkyl-substituted derivatives on zinc in a borate buffer solution with pH 7.4 and their protective effect on the oxidized surface of this metal in an aqueous solution of sodium chloride with a concentration of СNaCl=0.01 mol/L were studied. It was shown that their adsorption on zinc at E=0.2 V is adequately described by the complete Temkin isotherm equation. Sodium nonylmalonate anions have the highest standard free energy of adsorption (–ΔG0ads=76.7 kJ/mol), which is almost 2 times higher than for the malonate anions itself (38.7 kJ/mol). Such high values of (–ΔG0ads) indicate the chemisorption interaction of these organic anions with the oxidized surface of zinc. Corrosion tests of zinc plates in a chloride solution with addition of a three-component mixture containing sodium malonate+C2-malonate with 2-mercaptobenzimidazole showed high results: at Cin=0.004 mol/L, complete protection of zinc for 7 days can be achieved under natural aeration conditions of 0.01 M NaCl aqueous solution.

Source: International Journal of Corrosion and Scale Inhibition

DOI: 10.17675/2305-6894-2024-13-4-30

Authors: M.O. Agafonkina, Yu.I. Kuznetsov, N.P. Andreeva, Kh.S. Shikhaliev, Yu.A. Kovygin

Institutions: Russian Academy of Sciences, Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, Voronezh State University

Language: English

Topic: Corrosion Behavior and Inhibition

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $250

OpenAlex ID: W4405476124