Abstract
A variety of ferrous materials has been satisfactorily chromized at temperatures from 900 to 1200 C by immersion in fused salt baths containing from 5 to 30 weight per cent chromous chloride. The rate of case formation is equal to or greater than that obtained with the various pack methods at corresponding temperatures. The chromous chloride may be prepared in situ by the reduction of chromic chloride with chromium metal.