Zinc galvanized steel sheets crystal size influence in environments containing chlorides and sulfates

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Published May 5, 2015
https://doi.org/10.19053/01211129.3552
Section: PAPERS
Issue: Vol 24 No 39 (2015)
How to Cite
Ramírez-Jerez, J., Valero-Alvarado, M., Peña-Ballesteros, D., & Torres-Ramírez, J. (2015). Zinc galvanized steel sheets crystal size influence in environments containing chlorides and sulfates. Revista Facultad De Ingeniería, 24(39), 99-108. https://doi.org/10.19053/01211129.3552
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Autores

Julieth Andrea Ramírez-Jerez
Universidad Industrial de Santander, Colombia.

Mario Valero-Alvarado
Universidad Industrial de Santander, Colombia.

Darío Yesid Peña-Ballesteros
Universidad Industrial de Santander, Colombia.

Jhon Edisson Torres-Ramírez
Universidad Industrial de Santander, Colombia.

Abstract

This paper studied the influence of the zinc crystal size in the electrochemical behavior of steel sheets hot-dip galvanized. The tests were performed in an electrochemical flat cell in solutions with different concentrations of NaCl and NaSO4. The rate, mechanism of corrosion and the resistive and diffusive characteristics of the sheets were tested by electrochemical techniques like electrochemical impedance spectroscopy (EIS), polarization resistance (Rp) and potentiodynamic polarization curves. The composition and distribution of the products of corrosion (FeO and some zinc compounds) and the surface damage caused by them, were determined using XRD and SEM-EDS. Results showed that the degradation of the oxide layer formed is affected by the presence of chlorides, which penetrate reaching the surface of the base metal, producing localized corrosion.

Keywords:

galvanized steel
corrosion
chlorides
sulphates
resistance polarization
electrochemical impedance spectroscopy (EIS)
potentiodynamic curves

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References

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