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The corrosion of mild steel in simulated SO2 containing atmospheres

1989; Elsevier BV; Volume: 29; Issue: 11-12 Linguagem: Inglês

10.1016/0010-938x(89)90124-8

1879-0496

M.J. Justo, M.G.S. Ferreira,

Concrete Corrosion and Durability

Abstract Electrochemical tests were carried out on steel/steel multi-laminar cells under thin layers of sulphate solution simulating atmospheres with contents of 20, 50 and 75 μg m −3 of SO 2 and a relative humidity of 85%. Measurements of the current flowing between the two electrodes of the cell vs drying time and impedance measurements for different times were taken. Potentiodynamic cathodic polarization plots were also obtained for one concentration of contaminant at various drying times using three electrode multi-laminar cells. The results showed that the multi-laminar cells allowed the drying process of the thin electrolyte films to be followed. The use of electrochemical techniques gave information on the kinetics and mechanism of the corrosion process occurring during the drying period. Initially the process is controlled by oxygen diffusion through the liquid film, but for longer periods the control changes to the anodic reaction.