Scanning Electrochemical Microscopy Measurements of Ferrous ion Fluxes during localized Corrosion of Steel

ERNESTO JULIO CALVO; EDGAR VOLKER; CARLOTA GONZALEZ INCHAUSPE

ELECTROCHEMISTRY COMMUNICATIONS

Elsevier

Lugar: Amsterdam; Año: 2006 vol. 8 p. 179 - 183

1388-2481

Local fluxes of ferrous ions at low carbon steel surfaces coated with tin and an epoxy-phenolic resin on tinplate samples, and at chrome steel (tin-free steel) have been monitored by oxidation of Fe2+ ions at the tip of a Pt scanning electrochemical microscope (SECM). The samples were immersed in 10 mM H2SO4 in order to avoid Fe(OH)3 precipitation. The SECM was employed in the collection mode at constant height (10–15 lm) on an x–y plane above the sample, monitoring the tip current as a function of tip location.2+ ions at the tip of a Pt scanning electrochemical microscope (SECM). The samples were immersed in 10 mM H2SO4 in order to avoid Fe(OH)3 precipitation. The SECM was employed in the collection mode at constant height (10–15 lm) on an x–y plane above the sample, monitoring the tip current as a function of tip location.2SO4 in order to avoid Fe(OH)3 precipitation. The SECM was employed in the collection mode at constant height (10–15 lm) on an x–y plane above the sample, monitoring the tip current as a function of tip location.10–15 lm) on an x–y plane above the sample, monitoring the tip current as a function of tip location. 2005 Elsevier B.V. All rights reserved.2005 Elsevier B.V. All rights reserved.