Atmospheric corrosion of galvanised steel in different environments in Chile and Mexico

Ebelia Del Angel, ROSA DE LAS MERCEDES VERA ARAVENA, Francisco Corvo

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The behaviour of the atmospheric corrosion of galvanised steel is evaluated in three cities in Chile and Mexico. Meteorological variables were measured (T, RH, rainfall, wind speed) along with the principal air pollutants (SO2 and Cl- ions). Comparing the data from the Chilean and Mexican weather stations, there is a clear trend of decreased corrosion with the increase in mean temperature, and statistically significant influence from air pollutants was not seen under the conditions in question. The corrosion process does not develop uniformly, with the formation of voluminous corrosion products distributed heterogeneously over the galvanised surface. The main corrosion products in both environments, identified by XRD analysis, are: Zincite (ZnO), Zinc Hydroxide Sulphate Hydrate (Zn(OH)2)3(ZnSO4)(H2O)5), Zinc Oxide Sulphate Hydrate (Zn4O3(SO4).7H2O), Zinc Sulphate Hydroxide Hydrate (Zn4SO4(OH)6.4H2 O) and Simonkolleite (Zn5(OH)8Cl2.H2O). The presence of sulphate in the corrosion products shows that sulphur dioxide pollution plays an importance role in galvanised-steel corrosion, though no statistical evidence was found.

Original languageEnglish
Pages (from-to)7985-8004
Number of pages20
JournalInternational Journal of Electrochemical Science
Volume10
Issue number10
StatePublished - 2015
Externally publishedYes

Keywords

  • Atmospheric corrosion
  • Galvanised
  • Metal coatings
  • SEM
  • XRD

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