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Experimental and theoretical investigation on corrosion inhibition of AA5052 aluminium alloy by l-cysteine in alkaline solution
journal contribution
posted on 2016-02-01, 00:00 authored by D Wang, L Gao, D Zhang, D Yang, Hong Wang, Tong LinThe corrosion inhibition of l-cysteine on AA5052 aluminium alloy in 4 mol/L NaOH solution was investigated by hydrogen gas evolution experiment, polarisation curve, galvanostatic discharge, electrochemical impedance spectroscopy measurements and quantum chemical calculations. The adsorption of l-cysteine on aluminium alloy surface obeyed the amended Langmuir's adsorption isotherm. The polarisation curves indicated that l-cysteine acted as a cathodic inhibitor to inhibit cathodic reaction. The inhibition mechanism was dominated by the geometric covering effect. The galvanostatic discharge shows that the additives restrain the hydrogen evolution and increase the anodic utilization rate. Quantum chemical calculations indicated that l-cysteine molecules mainly interacted with on the carboxyl groups on the aluminium alloy surface. A strong hybridization occurred between the s-orbital and p-orbital of reactive sites in the l-cysteine molecule and the sp-orbital of Aluminium.
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Journal
Materials chemistry and physicsVolume
169Pagination
142 - 151Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0254-0584Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2015, Elsevier B.V.Usage metrics
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