Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Patent
1991-02-08
1993-03-16
Niebling, John
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
205227, 205287, 205289, C25D 306, C25D 550
Patent
active
051941007
ABSTRACT:
A method for depositing chromium on metal substrates is disclosed in which the chromium hardens when heated. The electrolytic plating bath includes water soluble Cr(III), a sulfate catalyst, a metal ion buffer, and sufficient amounts of a reducing agent such as methanol to reduce substantially all Cr(VI) to Cr(III). The heat-hardenable chromium deposit allows the plated substrate to be heat tempered after plating, which eliminates the necessity of removing oxidation products from an unplated heated substrate. Moreover, the amount of toxic Cr(VI) present in the bath is greatly diminished, and replaced with a Cr(III) species that is environmentally safer.
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Hyashi, "From Art to Technology: Developments in Electroplating in Japan," Plating and Surface Finishing 30-41 (Sep. 1991).
Dash John
DeHaven John
Blount, Inc.
Leader William T.
Niebling John
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