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

Translated title of the contribution: Evaluation of galvanized structural steel in front of marine environment corrosion part 1: Results after one year of exposure

ROSA DE LAS MERCEDES VERA ARAVENA, F. Guerrero, D. Delgado, R. Araya

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Translated title of the contributionEvaluation of galvanized structural steel in front of marine environment corrosion part 1: Results after one year of exposure
Original languageSpanish
Pages (from-to)37-50
Number of pages14
JournalRevista de la Construccion
Volume8
Issue number2
StatePublished - Dec 2009
Externally publishedYes

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