Influence of the electrolyte film thickness and NaCl concentration on the oxygen reduction current on platinum

abstract

Measurements of oxygen reduction current are performed on a platinum electrode submerged under NaCl electrolyte films of different thickness. The chloride concentration is kept constant or increases due to evaporation. Measurements are supported by the numerical Multi-Ion Transport and Reaction Model (MITReM). In case of constant salt concentration, oxygen reduction current is proportional to the reciprocal of the electrolyte film thicknesses down to 50-75 mu m; for lower thicknesses deviation from the Fick's law takes place. For evaporating films, oxygen current is the result of two counteracting phenomena: reducing film thickness and increasing salt concentration leading to decrease of oxygen solubility. (C) 2015 Elsevier Ltd. All rights reserved.

keywords

THIN-LAYER ELECTROLYTES; ATMOSPHERIC CORROSION; GALVANIC CORROSION; METALS; MODEL; STEEL; DIFFUSION; ZINC; TEMPERATURE; CONVECTION

subject category

Materials Science; Metallurgy & Metallurgical Engineering

authors

Dolgikh, O; Bastos, AC; Oliveira, A; Dan, C; Deconinck, J

our authors

acknowledgements

This work was carried out in the frame of the RFCS project AtCorAS

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