Abstract
Galvanized steel samples were exposed to open air on aluminum panels following the procedures established in norms ISO 8565 and ASTM G 50-76, in a humid tropical climate environment (Cunduacán, Tabasco). The rate of corrosion (loss of mass) was recorded at different time periods (February-July 2009), and it presented a C3 (medium) aggressiveness category according to norm ISO 9223:92. In accordance with norm ISO 9223, the deposition rate of the pollutant sulphur dioxide (SO2) corresponded to a low (Po) corrosive aggressiveness category, and that of sodium chloride (NaCl) corresponded to a low (S1) category. X ray analyses indicate the corrosion products that formed on the galvanized steel. These included Simonkoleite [Zn5(OH)8Cl2.H2O], Gordoite [Zn4Na(OH)6(SO4)Cl.(H2O)6] and pentahydrated zinc hydroxisulphate (Zn(OH)2)3(ZnSO4)(H2O)5. The results show the effect of the pollutants (NaCl and SO2) on the corrosion of galvanized steel in Cunduacán, Tabasco.
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