During atmospheric corrosion, steels are subjected to alternate periods of wetting and drying as a result of precipitation and subsequent evaporation. Under these conditions, electrochemical reactions consist mainly of oxygen reduction and iron dissolution. Corrosion current can be monitored barometrically without disturbing the thin electrolyte layer present A barometric technique was used to study the effect of small chromium and copper additons on the drying behavior of pure iron subjected to alternate condensation/evaporation cycles in a sulfur-dioxide-contaminated atmosphere.

Subject
Cathodic polarization, Water, Corrosion currents, Metal surfaces, Chromium, Wetting, Corrosion products, Steel, Oxygen, Copper, Risk reduction, Alloys, Drying
Keywords:
weathering steel, wet/dry cycling, critical wetting, simulated atmospheric corrosion
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1995
Association for Materials Protection and Performance (AMPP)
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