TY - JOUR
T1 - Atmospheric corrosion of galvanised steel in different environments in Chile and Mexico
AU - Del Angel, Ebelia
AU - Vera, Rosa
AU - Corvo, Francisco
N1 - Publisher Copyright:
© 2015 The Authors.
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
KW - Atmospheric corrosion
KW - Galvanised
KW - Metal coatings
KW - SEM
KW - XRD
UR - http://www.scopus.com/inward/record.url?scp=84945952779&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:84945952779
SN - 1452-3981
VL - 10
SP - 7985
EP - 8004
JO - International Journal of Electrochemical Science
JF - International Journal of Electrochemical Science
IS - 10
ER -
