Evaluación de acero galvanizado estructural frente a la corrosión en atmósfera marina. parte 1. resultados después de 1 año de exposición

R. Vera, F. Guerrero, D. Delgado, R. Araya

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

1 Cita (Scopus)

Resumen

In this study, the performance of the hot-dip galvanized steel in front of the marine environment corrosion and the corresponding runoff process observed in such environment are analysed. Therefore, 10x10x0.6cm galvanized steel samples, with a Zn coating thickness of 114 μm, were exposed in Valparaíso, V Region, Chile. Deterioration of the galvanized surface was evaluated measuring in situ corrosion potential and decreasing of zinc coating thickness; the attack morphology was analysed through scanning electron microscopy (SEM). The corrosion product composition was established through X-ray diffraction (XRD). Furthermore, different techniques were used to analyse the runoff solutions collected after rain events, in order to determine pH, Cl-ion content and Zn+2 ion concentration. The results after one year of exposure of the samples show that galvanized steel corrosion potential increased in time; this corroborates the formation of a protective layer of zinc corrosion products, which were identified as zincite (ZnO) and simonkoleite (Zn5(OH)8Cl2·H2O). On the other hand, the corrosion velocity determined in time was 16.4 μm/year. As for the rain events, the pH values of the runoff solutions were similar to the pH of the rain water. The chloride content also showed a tendency to decrease and stabilize in time; furthermore, the total zinc quantity lost as a soluble product is strongly influenced by the quantity, duration and periodicity among dry periods of fallen rain.

Título traducido de la contribuciónEvaluation of galvanized structural steel in front of marine environment corrosion part 1: Results after one year of exposure
Idioma originalEspañol
Páginas (desde-hasta)37-50
Número de páginas14
PublicaciónRevista de la Construccion
Volumen8
N.º2
EstadoPublicada - dic 2009
Publicado de forma externa

Palabras clave

  • Atmospheric corrosion
  • Chloride
  • Hot-dip galvanized steel
  • Runoff
  • Thickness loss

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