Method for producing a sheet steel product protected against corrosion
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United States of America Patent
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Issued Date -
Jun 4, 2009
app pub date -
Sep 22, 2006
filing date -
Sep 23, 2005
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Abandoned
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Abstract
A cost-favorable process for production of corrosion-resistant sheet steel products, having good characteristics of use for certain application purposes includes applying a zinc-containing coating by electro-galvanizing a flat steel product, finally cleaning mechanically and/or chemically the flat steel product, applying a magnesium-based coating to the finally cleaned zinc-containing coating by means of vapour deposition, and heat treating the coated flat steel product to form a diffusion or convention layer between the zinc-containing coating and the magnesium-based coating at a temperature of 320 ° C. to 335 ° C. under normal atmosphere.
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