Corrosion Inhibition and Acceleration by Rare Earth Ions in Galvanic Couples
authors Oliveira, M; Bastos, AC; Kallip, S; Hack, T; Zheludkevich, ML; Ferreira, MGS
nationality International
journal JOURNAL OF THE ELECTROCHEMICAL SOCIETY
keywords SOL-GEL COATINGS; CONVERSION COATINGS; SURFACE MODIFICATION; ALUMINUM-ALLOYS; CERIUM NITRATE; AL-ALLOYS; PROTECTION; HYDROGEN; OXYGEN; STEEL
abstract Rare earth ions are amongst the most promising new generation corrosion inhibitors. This communication describes conditions where, instead of inhibition, acceleration of corrosion occurs after rare earth salts are added to solution. The work was carried out mainly with the Fe-Zn galvanic couple and different rare earth salts, using electrochemical techniques such as galvanic current measurements, scanning vibrating electrode technique and linear sweep voltammetry (polarization curves). The increased activity in the couple is associated to an unexpected cathodic reaction that is observed after adding the salts to solution. The new reaction signifies supplementary oxidant species being reduced at the iron electrode (cathode), accelerating the oxidation of zinc (anode). The nature of this cathodic process is discussed. (C) The Author(s) 2019. Published by ECS.
publisher ELECTROCHEMICAL SOC INC
issn 0013-4651
isbn 1945-7111
year published 2019
volume 166
issue 16
beginning page C642
ending page C648
digital object identifier (doi) 10.1149/2.0761916jes
web of science category Electrochemistry; Materials Science, Coatings & Films
subject category Electrochemistry; Materials Science
unique article identifier WOS:000503840300001
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journal analysis (jcr 2019):
journal impact factor 3.721
5 year journal impact factor 3.719
category normalized journal impact factor percentile 67.989
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