Contributions to a more realistic characterization of corrosion processes on cut edges of coated metals using scanning microelectrochemical techniques, Illustrated by the case of ZnAlMg-galvanized steel with different coating densities
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Corrosion processes at cut edges of galvanized steels proceed as highly localized electrochemical reactions between the exposed bulk steel matrix and the protective thin metallic coating
of a more electrochemically active material. Scanning microelectrochemical techniques can thus
provide the spatially resolved information needed to assess the corrosion initiation and propagation
phenomena, yet most methods scan cut edge sections as embedded in insulating resin to achieve a
flat surface for scanning purposes. In this work, the galvanized coatings on both sides of the material
were concomitantly exposed to simulated acid rain while characterizing the cut edge response using
SECM and SVET techniques, thereby maintaining the coupled effects through the exposure of the
whole system as rather realistic operation conditions. The cut edges were shown to strongly promote
oxygen consumption and subsequent alkalization to pH 10–11 over the iron, while diffusion phenomena eventually yielded the complete depletion of oxygen and pH neutralization of the nearby
electrolyte. In addition, the cathodic activation of the exposed iron was intensified with a thinner
coating despite the lower presence of sacrificial anode, and preferential sites of the attack in the
corners revealed highly localized acidification below pH 4, which sustained hydrogen evolution at
spots of the steel-coating interface.
Como referenciar
BOLSANELLO, MARILIA F.; GARCIA, ANDREA A.; LIMA, LUCIANA X. da C.; KNEIPEL NETO, BRUNO; FERREIRA, JETSON L.; ROSSI, JESUALDO L.; COSTA, ISOLDA; SOUTO, RICARDO M.; IZQUIERDO, JAVIER. Contributions to a more realistic characterization of corrosion processes on cut edges of coated metals using scanning microelectrochemical techniques, Illustrated by the case of ZnAlMg-galvanized steel with different coating densities. Materials, v. 17, n. 7, p. 1-26, 2024. DOI: 10.3390/ma17071679. Disponível em: https://repositorio.ipen.br/handle/123456789/48074. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.