Efecto protector de las capas de productos de corrosión de exposición atmosférica

L. S. Hernández; J. M. Miranda; O. Domínguez

doi:10.3989/revmetalm.2002.v38.i2.391

Protective effect of the corrosion products layers of atmospheric exposure

Authors

L. S. Hernández Instituto de Metalurgia, Universidad Autónoma de San Luis de Potosí.
J. M. Miranda Instituto de Metalurgia, Universidad Autónoma de San Luis de Potosí.
O. Domínguez Instituto de Metalurgia, Universidad Autónoma de San Luis de Potosí.

DOI:

https://doi.org/10.3989/revmetalm.2002.v38.i2.391

Keywords:

Atmospheric corrosion, Potentiodynamic polarization, Corrosion potential, Corrosion products, Polarization resistance

Abstract

The electrochemical techniques of evolution of the corrosion potential (E_corr), polarisation resistance (Rp) and potentiodynamic polarisation, were used to evaluate the protectiveness of the corrosion products layers developed on commercial grade low carbon steel, zinc (galvanized steel), copper and aluminium, after an outdoor exposure of 1, 2 and 5 year in an urban atmosphere. Results obtained using a 0.1 M Na₂SO₄ solution revealed a greater anticorrosive protection of the four metallic materials as a result of the corrosion products formation. In addition, it was observed that when the outdoor exposure time increased the E_corr values were more noble, those of Rp increased and the potentiodynamic anodic polarisation curves showed a greater slope of the linear regions and a shifting to the area of smaller current density in the E vs. log i diagrams. These results were not in a total agreement with those obtained by weight loss.

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Published

2002-04-30

How to Cite

Hernández, L. S., Miranda, J. M., & Domínguez, O. (2002). Protective effect of the corrosion products layers of atmospheric exposure. Revista De Metalurgia, 38(2), 108–116. https://doi.org/10.3989/revmetalm.2002.v38.i2.391

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Issue

Vol. 38 No. 2 (2002)

Section

Articles

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