Abstract

GALLARDO-CASTAN, E. et al. Weather Conditions, Corrosivity Indexes and Electrochemical Corrosion of Carbon Steel, Copper and Zinc in the Coastal Atmosphere of Tuxpan, Veracruz, Mexico. J. Mex. Chem. Soc [online]. 2023, vol.67, n.4, pp.483-494.  Epub Apr 26, 2024. ISSN 1870-249X.  https://doi.org/10.29356/jmcs.v67i4.2041.

Tuxpan is a port with economic and industrial important activity subject to atmospheric corrosion of metal structures such as boats, ships, oil platforms, and power stations. The main purpose of this paper is to evaluate the atmospheric corrosion of Tuxpan Veracruz, it was necessary to install an exposition panel with carbon steel specimens, galvanized steel (zinc), and copper to evaluate them in every season by electrochemical methods (electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and potentiodynamic polarization curves (CP). In addition, corrosivity indexes of atmospheric are evaluated by CLIMAT and ISO methodology. An exposition panel was installed with specimens of aluminum wire on steel screws, copper screws, and nylon screws to study corrosivity indexes through mass loss in every season of the year and thus classify the different types of atmospheres; marine, industrial, and rural-urban according to the values specified in the standard (ISO 8408, 9223, 9224). The corrosivity indexes are under the standards allowed in the regulations. However, they show the aggressiveness of the marine and industrial atmosphere due to the location and activities of the port in the northern zone. Zinc and carbon steel corrodes due to aggressive agents such as chlorides and sulfur dioxide, forming soluble oxides on the surface of the metallic substrate, while copper forms corrosion products that weakly protect its surface.

Keywords : Corrosion; CLIMAT; corrosivity indexes; electrochemical impedance.

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