High effective organic corrosion inhibitors for 2024 aluminium alloy
authors Lamaka, SV; Zheludkevich, ML; Yasakau, KA; Montemor, MF; Ferreira, MGS
nationality International
journal ELECTROCHIMICA ACTA
author keywords inhibitor; aluminium alloy; salicylaldoxime; 8-hydroxyquinoline; quinaldic acid; scanning Kelvin probe force microscopy
keywords PROBE FORCE MICROSCOPY; ALUMINUM-ALLOY 2024-T3; ATOMIC-FORCE; CHLORIDE SOLUTIONS; PITTING CORROSION; COPPER CORROSION; IN-SITU; AA2024-T3; MECHANISM; SURFACE
abstract The inhibiting effect of several organic compounds on the corrosion of 2024 aluminium alloy in neutral chloride solution was investigated in the present work. The candidates were selected based on the assumption that effective inhibitors should form highly insoluble complexes with components of AA2024. Along with organic complexing agents, the salts of rare-earth elements were included into screening electrochemical impedance spectroscopy (EIS) test for getting comparative data. Results of EIS analysis revealed three most effective organic inhibitors: salicylaidoxime, 8-hydroxyquinoline and quinaldic acid. Their anti-corrosion performance was additionally investigated via dc polarization, as well as localized techniques: scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy coupled with scanning Kelvin probe (SKPFM). Localized measurements at exactly the same microdimensional zones of the alloy before and after immersion into 0.05 M sodium chloride solution allowed tracing the evolution of the Volta potential, chemical composition, surface topography and formation of corrosion products on the surface and intermetallic inclusions during the corrosion tests. The results show that the quinaldic acid, salicylaldoxime and 8-hydroxyquinoline provide anti-corrosion protection for AA2024 forming a thin organic layer of insoluble complexes on the Surface of the alloy. Inhibiting action is the consequence of suppression of dissolution of Mg, Al and Cu from the corrosion active intermetallic zones. (C) 2007 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2007
volume 52
issue 25
beginning page 7231
ending page 7247
digital object identifier (doi) 10.1016/j.electacta.2007.05.058
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000249426300007
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