Process for producing a protective film on magnesium containing substrates by chemical vapor deposition of two or more layers

摘要

A process for producing a protective film on a magnesium based metallic substrate comprising producing successive deposits by vapor phase chemical deposition of at least one intermediate layer of metallic aluminum, and at least one surface layer of metallic oxide, and for the intermediate aluminum layer using a precursor chosen of triisobutylaluminum, heating the substrate to a temperature between 250 DEG C. and 320 DEG C., and for the surface layer selecting an appropriate precursor, heating the substrate to an appropriate temperature and introducing the precursor vapor to produce a protective film having a high surface hardness and strong adherence to the magnesium based substrate with high inertness in the electrochemical series, and forming an effective protection under both static and dynamic conditions.