Zinc coated steel plates coated with a pre-lubricating hydroxysulphate layer and methods for obtaining same
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United States of America Patent
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Mar 4, 2003
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N/A
app pub date -
Jun 25, 2001
filing date -
Sep 15, 1998
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Abstract
The invention concerns a steel plate coated with a metal layer based on zinc and a zinc hydroxysulphate layer, whereof the surface density of sulphur is more than 0.5 mg/m.sup.2. The invention also concerns a method for obtaining said plate by treating a zinc coated sheet metal: either in a highly alkaline sulphate solution under polarization; or in a sulphate solution containing Zn.sup.2+ ions without polarization. The hydroxysulphate deposit brings about a pre-lubricating effect applicable to operations for forming sheet metal.
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