Method for the heat and chemical treatment of metal parts, mainly for motor vehicles

摘要

Method for the heat and chemical treatment of metal parts, mainly for motor vehicles Comprises treating the said parts in an atmosphere containing nitrogen at a temperature of not more than 680 degree C and for sufficient time to form a carbonitride or oxynitride structure upon them in a thickness of at least 5 μ m, allowing a porous structure to form on the parts, holding the parts in an oxidising atmosphere at the temperature mentioned, cooling the parts and filling the pores in the said porous structure with an oil containing 0.5-10% by mass of sulphur. The invention is useful for applying wear-resistant or corrosion-resistant coatings to parts made of iron-based or aluminium-based alloys.