A new concept for corrosion inhibition of magnesium: Suppression of iron re-deposition
authors Lamaka, SV; Hoche, D; Petrauskas, RP; Blawert, C; Zheludkevich, ML
nationality International
journal ELECTROCHEMISTRY COMMUNICATIONS
author keywords Magnesium corrosion; Cathodic corrosion inhibition; Iron complexing agents; Hydrogen evolution
keywords ENHANCED CATALYTIC-ACTIVITY; HYDROGEN EVOLUTION; COMPLEXES; ALLOY; MG; DISSOLUTION; TETRAPHENYLPORPHYRIN; ELECTROLYTE; MECHANISM; SURFACES
abstract In our recent work (Hoche et al. 2016) we proposed that non-faradaic dissolution of Fe impurities and/or iron containing phases with subsequent re-deposition of thin film of pure ("in statu nascendi") iron enlarges cathodically active sites at the surface of corroding magnesium. The effect drastically accelerates corrosion of impurity containing Mg. In the present work we assume that if Fe re-deposition is prevented, the area of cathodic sites can be drastically decreased and hence corrosion of Mg can be suppressed. In this proof of concept work we use strong Fe3+ completing agents in order to remove dissolved iron cations from corrosion sites and prevent iron re-deposition. All used iron complexing agents efficiently lowered the corrosion rate of Mg. Direct correlation of complex stability with its inhibiting efficiency was established. It was shown that cyanide, salicylate, oxalate, methylsalicylate and thiocyanate efficiently reduce hydrogen evolution and suppress critical dark area formation. (c) 2015 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE INC
issn 1388-2481
year published 2016
volume 62
beginning page 5
ending page 8
digital object identifier (doi) 10.1016/j.elecom.2015.10.023
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000368221000002
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journal impact factor 4.333
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