Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 166, Issue 16, Pages C642-C648Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0761916jes
Keywords
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Funding
- national funds through the FCT/MEC [POCI-01-0145-FEDER-007679, FCT UID/CTM/50011/2013]
- FEDER under the PT2020 Partnership Agreement
- FCT [SFRH/BD/117518/2016, IF/00856/2013]
- FCT - Fundacao para a Ciencia e a Tecnologia, I.P. [4, 5, 6, Decree-Law 57/2016]
- ETAg [PUT1033]
- ERA.NET [RUS_ST2017-477]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/117518/2016] Funding Source: FCT
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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.
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