Details

Autor(en) / Beteiligte

• Nguyen, Van Anh
• Newman, Roger C.

Titel

A comprehensive modelling and experimental approach to study the diffusion-controlled dissolution in pitting corrosion

Ist Teil von

• Corrosion science, 2021-07, Vol.186, p.109461, Article 109461

Ort / Verlag

Amsterdam: Elsevier Ltd

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •A full mass transport model is coupled with artificial pit experiments.•In dilute NaCl solutions, the limiting current density increases due to migration.•The presence of Na+ at the pit bottom is significant in high bulk NaCl solutions.•Na+ at the pit bottom increases the limiting current density to some degree.•The diffusivity and the solubility of dissolving metal ions were obtained. The novelty of this paper is that we consider the “diffusion-controlled” dissolution of a metal in a pit from a more advanced point of view, such that the limiting anodic current density (iL) varies with the bulk NaCl concentration in accordance with a mathematical model that includes ion migration. The full mass transport model was coupled with artificial pit experiments to obtain critical parameters for pit stability. At above 2.5 M NaCl, the conventional diffusion-only model gives reasonably accurate results, but the effect of Na+ at the bottom of the pit on iL and the metal’s solubility should be considered.