Atmospheric corrosion of galvanized steel and precipitation runoff from zinc in a marine environment

Journal of the Brazilian Chemical Society

Rosa Vera¹  Fabián Guerrero¹  Diana Delgado¹  Raquel Araya¹ 

[1] ,Pontificia Universidad Católica de Valparaíso Facultad de Ciencias Instituto de QuímicaValparaíso,Chile

关键词: atmospheric corrosion;    galvanized steel;    mass loss;    runoff;    chloride;   

DOI  :  10.5935/0103-5053.20130060

来源: SciELO

【 摘 要 】

This study focuses on the behavior of galvanized steel in a corrosive marine environment and on the runoff process for the same material occurring in Valparaiso, Chile. The corrosion potential and corrosion rate evaluated via mass loss were used to determine the corrosion damage to the galvanized steel. The compositions of the corrosion products were determined using X-ray diffractometry (XRD), and their morphology through scanning electron microscopy (SEM). The runoff solutions collected after rainfall were analyzed to determine the pH value, and Cl-, SO4(2 -) and Zn2+ ion concentrations. The results after 15 months show that the corrosion potential of the galvanized steel increases over time, indicating the formation of a protective film that consists of zinc corrosion products. These products were identified as zincite and simonkolleite. The pH values obtained for the runoff solutions are similar to those of the reference rainwater samples, and the chloride concentrations of the runoff solutions are approximately twice those of the rainwater.

【 授权许可】

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