From early research work, Zinc-Magnesium-Aluminium coatings (ZM) are well known to be very attractive for corrosion protection. So in the last 10 years, Mg- and Al-contents were adapted for use in the automotive market and combined with the largely optimized and cost-effective hot-dip galvanizing process. While conducting their researches separately in most cases, European steelmakers converged to form a unique new family of coating systems including the same phases (Zn, Zn2Mg, Al-rich Zn phase), Magnesium content varying from 1.0 to 3.0 wt % and Aluminium content from 1.0 to 3.7 wt %. To help OEM figure out the potential of this new family of Zinc-Magnesium- Aluminium coatings, European steelmakers felt it more efficient to build a common technical form of communication. To achieve this objective, a working group was created at Steel Institute VDEh representing ArcelorMittal, Ruukki, Salzgitter, Tata Steel, ThyssenKrupp Steel Europe, voestalpine and Wuppermann. After intense discussions, the technical characteristics of ZM coatings, which are shown here, were worked out. Moreover, the comparison with all competing systems showed that all European ZM alloys are interchangeable. Through the example of 'drawing evaluations' in comparison with regular Zinc coating, the process followed by the working group to compare coatings is described. Technical results shared, such as friction or powdering or galling, are detailed, and demonstrate that new European Zinc-Magnesium-Aluminium coating family offers a significant potential of performance increase at OEM's press-shops. A short technical synthesis on tests done dealing with other properties is also given, showing that independent of the composition in the range 1.0 to 3.0 wt % for Magnesium and 1.0 to 3.7 wt % for Aluminium, the performances are at close range.


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    Title :

    The new family of european ZM coatings - A promising option for the automotive industry


    Additional title:

    Die neue Familie der europäischen ZM-Beschichtungen - eine vielversprechende Option für die Automobilindustrie


    Contributors:


    Publication date :

    2014


    Size :

    8 Seiten, 10 Bilder, 3 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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