Low mist chromium plating method and system
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United States of America Patent
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Apr 14, 1992
Grant Date -
N/A
app pub date -
Oct 18, 1990
filing date -
Oct 18, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A low mist chromium plating system is disclosed which comprises a closed plating tank containing chromium plating solution preferably covered by a layer of mist suppressing foam. Nitrogen carrier gas is introduced into the plating tank above the plating solution and carries chromium mist to a series of aqueous traps. The first trap contains sodium bisulfite for reducing hexavalent chromium ions to trivalent chromium ions. The last trap contains 1,5-diphenylcarbohydrazide for indicating the presence of hexavalent chromium.
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