To offer customers cost advantages a new product family of Zn-Mg coated steel sheets - ZE-Mg - is under development at the surface technology center DOC by means of physical vapor deposition of magnesium on already zinc coated steel sheet. The new Zn-Mg alloy coating allows to reduce the thickness of the metallic coating in the case of ZE-Mg 35/35 to about 3.5 micron instead of 7.5 micron for conventional zinc coated steel sheets while the level of corrosion protection is a comparable level. Target is to achieve advantages with regard to further processing e.g. simplified laser welding of overlap joints. The current developments of new post treatments are focusing particularly, on systems which offer improved environmental characteristics, better corrosion protection and enhanced forming properties. Drylubes offer these properties. Strip drawing tests and measurements of the deep drawing working range demonstrate improved tribological properties. Drylubes permit heavy deep-drawing operations without any additional lubrication. Spot lubricants are needed only in extremely critical areas. Corrosion protection by metallic coatings can be further enhanced by organic coatings which are applied in a coil coating process. Precoated steel sheet like weldable corrosion protection primer, preprimed and prefillered enable savings due to the elimination of mainly cost-intensive key process steps at carmakers' and suppliers' paint process chain. These products can benefit of using ZE-Mg.
Tailored steel strip coatings for modern car body and corrosion concepts
Maßgeschneiderte Beschichtungen für Stahlfeinbleche für moderne Karosserie- und Korrosionskonzepte
2005
8 Seiten, 4 Bilder, 1 Tabelle, 2 Quellen
Aufsatz (Konferenz)
Englisch
New System Concepts for Steel and Aluminum Tailored Blank Welding
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