Cinética de las transformaciones químicas y estructurales de las herrumbres expuestas en ambientes con cloruros y SO<sub>2</sub>

J. L. Rendon; A. Valencia

doi:10.3989/revmetalm.2003.v39.iExtra.1089

Kinetics of structural rust transformation in environments containing chloride and SO₂

Authors

J. L. Rendon Materials Engineering Department, University of Antioquia
A. Valencia Materials Engineering Department, University of Antioquia

DOI:

https://doi.org/10.3989/revmetalm.2003.v39.iExtra.1089

Keywords:

Atmospheric Corrosion. Sulphur dioxide/chloride relation. Rust formation. Potential measuring. Simulation test

Abstract

The behavior of the rusts produced on low carbon steel exposed in industrial atmospheres, at different distances from the sea, was studied by simulating the wetting-drying cycle in a CEBELCOR type apparatus. Coupons electrode potential was monitored and rust layer was analyzed by gravimetric techniques, optical microscopy and Mössbauer spectroscopy. A particular chloride/sulfur ratio in the atmosphere was found, for which there is a particular behavior in rust formation. For this ratio, corrosion rates were much less than expected. It is postulated a kinetic mechanism for rust layer formation as the origin of this special behavior. An electrode potential similar to that in a weathering steel was observed, this is reflected in the low corrosion rate obtained. The proposed kinetic mechanism for rust formation under these exposure conditions enables new research lines on layer formation and the development of protective rust for industrial marine atmospheres.

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Published

2003-12-17

How to Cite

Rendon, J. L., & Valencia, A. (2003). Kinetics of structural rust transformation in environments containing chloride and SO2. Revista De Metalurgia, 39(Extra), 9–14. https://doi.org/10.3989/revmetalm.2003.v39.iExtra.1089

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Issue

Vol. 39 No. Extra (2003)

Section

Articles

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