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New zinc-magnesium coatings for steel sheets with improved laser weldability

: Zwick, Axel

VDI-Z integrierte Produktion 146 (2004), Nr.1/2, S.72-73
ISSN: 0042-1766
ISSN: 1436-4972
Fraunhofer IWS ()
electrogalvanized steel; magnesium; zinc; PVD; anticorrosive coating; laser weldability; automobile body

A new processing route is introduced for assisting robot-aided car body welding in automotive industry. Galvanized steel sheet is used as starting material. The continuous processing route is characterized by a combination of Mg alloy PVD and a subsequent thermal treatment. As a result a corrosion resistant functional graded composite coating structure is obtained in which now the Zn sub-coating is covered by the MgZn2 top-coating.