corrender the Zinc-Magnesium-Aluminium (ZM)-HDG-Coated Sheet Steel by voestalpine, is Making its Way into the Automotive World – from Structural Parts to Outer Panels

Paper #:
  • 2017-01-0507

Published:
  • 2017-03-28
Abstract:
In the last decade a new Zinc-Magnesium-Aluminium coating (ZM-coating) for HDG steel sheet was developed at voestalpine. Unlike the well-established ZnAlMg-coatings from Japan which have significant higher alloying contents (for building applications), this ZincMagnesium coating (ZM) is also specifically designed to meet the requirements of car manufacturers. voestalpine's ZM-coating (corrender) is already approved by many OEMs and is currently used in the car body as a substitute for GI. Typical applications are structural as well as exposed parts. The ZM-coating introduced by voestalpine is in the upper range of ZM-alloying compositions, which was set by SAE and VDA (German Association of the Automotive Industry) to be within 1.0 to 2.0 wt% Mg and 1.0 to 3.0 wt% Al. The properties of these “European” Zinc-Magnesium coatings are well comparable within this range. Compared to GI and GA ZM-coatings exhibit significant advantages in the press shops with its excellent formability and reduced galling and powdering respectively which is a significant advantage for the forming of outer panels. Furthermore, ZM-coatings also excel in corrosion protection, especially cosmetic corrosion protection. The joining-process of ZM-coated steel sheet is similar to the performance of GI. The same is true for its paintability (phosphating). ZM-coatings are applied in state-of-the-art continuous galvanizing lines (CGL) in a continuous hot-dip-galvanizing process with several optional chemical post-treatments. The current product range covers mild steels, IF- or bake-hardening grades.
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