Show simple item record

Authordc.contributor.authorCáceres, Luis es_CL
Authordc.contributor.authorVargas Valero, Tomás es_CL
Authordc.contributor.authorHerrera, Leandro es_CL
Admission datedc.date.accessioned2008-05-14T14:07:05Z
Available datedc.date.available2008-05-14T14:07:05Z
Publication datedc.date.issued2007es_CL
Cita de ítemdc.identifier.citationCORROSION SCIENCE Vol. 49 AUG 2007 8 3168-3184es_CL
Identifierdc.identifier.urihttps://repositorio.uchile.cl/handle/2250/124702
General notedc.descriptionPublicación ISIes_CL
Abstractdc.description.abstractCorrosion of carbon steel in un-buffered NaCl solutions was studied applying linear potential sweep technique to a rotating disk electrode. Current-potential curves were obtained from linear potential sweep at a rate of 1 mV s(-1) in solution with concentrations in the range 0.02-1 M NaCl and rotation rates in the range 170-370 rad s(-1), at 22 degrees C. Potential sweeps, which were conducted in the potential range -700 to -100 mV/SHE, were started from the cathodic limit in order to approach the measurement of corrosion under rust-free conditions. Polarization curves were analyzed with a superimposition model developed ad hoc and implemented in a computer program, which enabled determining the corrosion rate and kinetics parameters of the underlying anodic and cathodic sub-processes. The anodic sub-process, dissolution of iron, was well described in terms of a pure charge transfer controlled reaction, while the cathodic sub-process, oxygen reduction on iron, was well described in terms of mixed mass transfer and charge transfer control. Increase of electrode rotation rate increases the limiting current of oxygen reduction, which results in an enhanced corrosion rate of carbon steel. Increase of NaCl concentration has a dual effect: the limiting current of oxygen reduction decreases as a result of the influence of NaCl concentration on solution viscosity and the anodic dissolution of iron increases due to the influence of NaCl on pitting formation. However, this last mechanism predominates and a net increase in carbon steel corrosion rate is observed in this case. (c) 2007 Elsevier Ltd. All rights reserved.es_CL
Lenguagedc.language.isoenes_CL
Keywordsdc.subjectmild steeles_CL
Area Temáticadc.subject.otherMaterials Science, Multidisciplinary; Metallurgy & Metallurgical Engineeringes_CL
Títulodc.titleDetermination of electrochemical parameters and corrosion rate for carbon steel in un-buffered sodium chloride solutions using a superposition modeles_CL
Document typedc.typeArtículo de revista


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record