Galvanic bath, method for producing structured hard chromium layers and use thereof
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United States of America Patent
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Sep 10, 2002
Grant Date -
N/A
app pub date -
Mar 7, 2001
filing date -
Jun 26, 1998
priority date (Note) -
Expired
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Abstract
The present invention relates to a galvanic bath, to a process for the precipitation of chromium onto objects, and to the use of the process for the generation of textured hard-chrome layers on machine components. The galvanic bath contains in aqueous solution at least one compound delivering chromium(VI)-ions, and it comprises a) chromium(VI)-ions in an amount that corresponds to 100 to 600 g/ltr of chromic acid anhydride, b) sulfate ions in the form of sulfuric acid and/or of a soluble salt thereof in a molar concentration ratio of chromium(VI)-ions to sulfate ions (SO.sub.4.sup.-2) ranging from 90:1 to 120:1, and c) 2-hydroxyethane sulfonate ions in an amount that corresponds to 0.01 to 3.0 g/ltr of the sodium salt.
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