IMPROVEMENTS IN OR RELATING TO A PROCESS FOR INCREASING THE CORROSION RESISTANCE OF NITRIDED BUILDING MATERIALS MADE OF IRON

摘要

To increase the corrosion resistance of nitrided structural parts made of iron materials which are useful for all types of iron and steel there is carried out an oxidation treatment in connection with the nitriding process. The oxidation treatment is carried out for 15 to 50 minutes in an oxidizing salt bath. The salt bath preferably consists of alkali hydroxides with 2 to 20% of alkali nitrates.