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Inhibition effect and theoretical investigation of dicarboxylic acid derivatives as corrosion inhibitor for aluminium alloy
Author(s) -
Zhang Daquan,
Yang Hanxue,
Li Xiaohui,
Chen ShiLin,
Gao Lixin,
Lin Tong
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201911444
Subject(s) - amine gas treating , corrosion , alloy , chemistry , mulliken population analysis , ethylene glycol , inorganic chemistry , organic chemistry , molecule
The corrosion inhibition ability of l ‐malic acid (MaA) and l ‐aspartate acid (AsA) against corrosion of the AA5052 alloy in 4 M sodium hydroxide–ethylene glycol solution is investigated. The presence of MaA and AsA in corrosion solution shows a remarkable inhibition of hydrogen evolution of the AA5052 alloy. AsA has the better inhibition effect for the self‐corrosion of the AA5052 alloy and its max protection efficiency is 82.1%. This shows that the Mulliken charges of the nitrogen atom of the amine group on the AsA is lower than the Mulliken charge of the oxygen atom of the hydroxyl group on the MaA; the total Mulliken charge of AsA is lower than MaA, and AsA has a higher E HOMO and a lower energy gap, Δ N . The amine group and carboxyl group on the AsA is easier to coordinate with Al 3+ ions to form a stable complex.