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Electrochemical Kinetic of a Low Carbon Steel in Seawater at Different Flow Speed

Published online by Cambridge University Press:  11 May 2015

A. Carmona ,
R. Orozco-Cruz ,
E. Mejía-Sánchez ,
A. Contreras  and
R. Galván-Martínez
A. Carmona
Affiliation:
Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Av. S.S. Juan Pablo II s/n, Fracc. Costa Verde, C.P. 94294, Veracruz, México.
R. Orozco-Cruz
Affiliation:
Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Av. S.S. Juan Pablo II s/n, Fracc. Costa Verde, C.P. 94294, Veracruz, México.
E. Mejía-Sánchez
Affiliation:
Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Av. S.S. Juan Pablo II s/n, Fracc. Costa Verde, C.P. 94294, Veracruz, México.
A. Contreras
Affiliation:
Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte No.152, Col. San Bartolo Atepehuacan, Del. Gustavo A. Madero, C.P. 07730, México.
R. Galván-Martínez*
Affiliation:
Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Av. S.S. Juan Pablo II s/n, Fracc. Costa Verde, C.P. 94294, Veracruz, México.
*
*E-mail: [email protected]
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Abstract

An electrochemical impedance spectroscopy (EIS) corrosion study of API X70 steel was carried out in synthetic seawater with different rotation speeds using a rotating cylinder electrode (RCE) to control the hydrodynamic conditions at room temperature, atmospheric pressure and 24 h of exposure time. A superficial analysis through a scanning electron microscope (SEM) was used to analyze the corrosion type. The rotation speed used was 0 rpm (static condition), 1000, 3000 and 5000 rpm (turbulent flow). The results show that the turbulent flow conditions affect directly the corrosion rate (CR) of the steel, because all values of the CR under turbulent flow conditions are higher than the CR values at static conditions. In addition, it is important to point out that at turbulent flow conditions, the CR increased as the rotation speed also increased. The morphology of the corrosion in all experiments was localized corrosion.

Keywords

Corrosionsteelfilmscanning electron microscopy (SEM)kinetics
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1766: Symposium 5B – Structural and Chemical Characterization of Metals, Alloys, and Compounds—2014 , 2015 , pp. 73 - 80
Copyright
Copyright © Materials Research Society 2015 

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