Etapas iniciales del zinc runoff en clima tropical Etapas iniciales del zinc <i>runoff</i> en clima tropical

E. Meraz; L. Veleva; M. Acosta

doi:10.3989/revmetalm.2007.v43.i2.55

Authors

E. Meraz Universidad Juárez Autónoma de Tabasco, División Académica de Ingeniería y Arquitectura
L. Veleva Centro de Investigación y Estudios Avanzados (CINVESTAV), Unidad Mérida, Departamento de Física Aplicada
M. Acosta Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Básicas

DOI:

https://doi.org/10.3989/revmetalm.2007.v43.i2.55

Keywords:

Zinc, Galvanized steel, Runoff, Atmospheric corrosion, Tropical humid climate

Abstract

Frecuently used metals in building application are Zinc and hot dip galvanized steel. The zinc has a relativelly good atmospheric resitance, due to its oxidation in air and formation of protective layer. However, some of the zinc corrosion products can be dissolved by pluvial precipitations and water condensed on the metal surface. This process is called metal runof. In order to estimate el zinc runoff in humid tropical climate, since its firs stages, samples of pure zinc and hot dip galvanized steel have been exposed during 2 years in outdorr atmosphere (rural and urban). The data reveal high annual values of zinc runoff (8,20–12,40 ±0.30 g/m²año), being this process 80% of total mass loss of corroded zinc. The runoff and corrosion processes are more accelerated for zinc, than that of galvanized steel. The principal factors that control the runoff process are discussed.

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