Ion Vapour Deposited (IVD) Aluminium Coatings for the Corrosion Protection of High Strength Steel
AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
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Extensive metallographic, corrosion and hydrogen embrittlement tests have been carried out with high strength steel sheet coated with ion vapour deposited IVD aluminum. Metallography showed that the thickness of the as- deposited IVD coatings was not uniform and that the coatings contained extensive microporosity. The application of glass bead blasting after coating, significantly reduced the porosity but did not remove it completely. The IVD coatings were found to be effective in preventing corrosion of the steel substrate provided the coating was sufficiently thick and its porosity low. Exposure of IVD coated steel to aqueous environments was found to produce hydrogen embrittlement of the high strength steel substrate under certain conditions.
- Metallurgy and Metallography