Connecting device of two hot pipe flanges of the exhaust pipes of an internal combustion engine

摘要

The invention relates to a sprung steel connecting element at risk of corrosion, for connecting two hot components. The aim of the invention is to protect said element against corrosion in a functionally efficient and cost-effective manner. To achieve this, either the surface of the connecting element is nitrated and/or nitrocarburated and subsequently treated by oxidation, or a layer consisting of magnetite (Fe3O4 corrosion layer) is applied. A steel, in particular of formula 51CrV4, is used as the base material.