Abstract
The behavior of sulfur dioxide on low-alloy weathering steel and high strength steel (SM 50) has been clarified as to the rate of sulfate formation in the rust and its removal by water treatments. The rate of sulfate formation can be obtained by exposing steels rusted by pre-exposure to an industrial atmosphere for various periods up to two years to a radioactive SO2 environment for a few days and by determining the radioactivity of the formed sulfate. The rate of dissolution of the radioactive sulfate is determined either by immersion in distilled water or by spraying tap water on the surface.The results show that the rate of sulfate formation is lower on weathering steels and on steels pre-exposed to the atmosphere for longer periods. The tendency is in parallelism with the variation of the corrosion rates in the atmosphere with respect to steel composition and exposure time. The amount of dissolved sulfate is less for weathering steels but the percentage is almost the same regardless of steel composition.The fate of sulfur contained in steel has also been studied. In absence of copper, sulfur changes to sulfate and accumulates in rust in the course of atmospheric corrosion, but the presence of copper drastically reduces the sulfate formation.The material balance of sulfate in rust mins is considered and a mechanism of corrosion resistance of weathering steels in connection with the behavior of sulfate is discussed.
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