The influence of salts in rusts on the corrosion of the underlying steel

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Abstract
A series of synthetic rusts was prepared with a range of sulphate and chloride contents. The samples were placed on steel specimens and after a test period of 30 days at different relative humidities, the corrosion of the underlying steel was measured. The presence of salts caused increased corrosion of the steel, and this increased with the amount of salt in the rust. Corrosion was inappreciable below a relative humidity of about 40%.