Low mist chromium plating method and system

Details Low mist chromium plating method and system Low mist chromium plating method and system

1990-10-18

1992-04-14

Valentine, Donald R.

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Utilizing mist prevention

204228, 204277, 204278, 204130, C25D 304, C25D 2104, C25D 2111, C25D 1700

Patent

active

051044960

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.

REFERENCES:
patent: 1344030 (1920-06-01), Greenawalt
patent: 2439491 (1948-04-01), Schiffl
patent: 2913377 (1959-11-01), Brown
patent: 4411760 (1983-10-01), Guerriero et al.
patent: 4425197 (1984-01-01), Inoue
patent: 4592819 (1986-06-01), Suzuki et al.

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