Contribution Oral Presentation
JET VAPOUR DEPOSITION: A TECHNICAL ECONOMIC ALTERNATIVE TO ELECTRO-GALVANIZING FOR Zn COATINGS OF FUTURE STEELS
- Pace SERGIO
Jet Vapour Deposition (JVD) technology is industrialized at ArcelorMittal since mid of 2016. This technology, developed in partnership with CRM Group, constitutes an attractive technical and economic alternative to Electro-Galvanizing (EG) deposition process. JVD is a vacuum deposition process fully compatible with high line speeds, which allows the deposition on all kinds of steels of pure zinc coatings with in-use product properties similar to EG coatings ones. Furthermore, thanks to its flexibility, a wide range of coating thickness that can be different on each side, is accessible according to the request of customers. For automotive market, the current production concerns Advanced / Ultra High Strength Steels (AHSS / UHSS) higher than 1000 MPa used for structural parts in vehicles. This request is motivated by the fact that JVD is an hydrogen free process, with no risk of embrittlement by hydrogen for these steels. This is a major advantage of JVD compared to EG, since EG requires a post-thermal treatment to degas hydrogen trapped in steel during Zn deposition. But JVD may also be suitable for drawing steels used for external / exposed parts of vehicles, which require a very good aspect quality. JVD has a limited impact on the steel topography parameters. Using automotive exposed formats leads to JVD Zn coated steels fulfilling exposed specifications. Lastly, JVD is a green process compared to EG: less energy and water are required to produce a similar coating.
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automotive, vacuum evaporation, Zn coatings, Advanced High Strength Steels, Ultra High Strength Steels, 3rd generation steels, hydrogen, exposed quality, corrosion protection, environmentally friendly