Corrosión de acero galvanizado en un ambiente que contiene cloruros y sulfatos mediante técnicas electroquímicas/Corrosion behavior of galvanized steel in an atmosphere containing chlorides and sulfates by electrochemical techniques

Corrosion behavior on galvanized steel sheets, immersed in solutions with different concentrations of NaCl and Na^sub 2^SO^sub 4^ was studied. The steel sheets were immersed using an elevator, in order to simulate an atmosphere, wherein the sheets were always interacting with corrosive medium. The degradation was evaluated by electrochemical impedance spectroscopy and potentiodynamic curves. The morphology of surface was analyzed by scanning electron microscopy and the composition of the corrosion products was determined by EDX and XRD. The results after 30 days showed that the corrosion potential increased with the time, confirming the formation of passive products on the surface; corrosion rate also increased, causing pitting corrosion. For the first few days of exposure, generalized corrosion was observed as a result of compounds passive, porous nature and white.