Electrolytic phosphate chemical treatment method

Details Electrolytic phosphate chemical treatment method Electrolytic phosphate chemical treatment method

2002-02-20

2010-11-16

Wong, Edna (Department: 1795)

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Depositing predominantly alloy coating

C205S098000, C205S101000, C205S258000

Reexamination Certificate

active

07833404

ABSTRACT:
A method of forming a film composed of a phosphate compound and a metal on the surface of an article to be treated by performing electrolytic treatment on a metal article to be treated in a phosphate chemical treatment bath. The method includes contacting the metal article having electrical conductivity with the phosphate chemical treatment bath containing phosphate ions and phosphoric acid, nitrate ions, metal ions that form a complex with phosphate ions in the phosphate chemical treatment bath, and metal ions for which the dissolution-precipitation equilibrium potential at which ions dissolved in the phosphate chemical treatment bath are reduced and precipitate as metal is equal to or greater than −830 mV. The (oxidation-reduction potential) of the phosphate chemical treatment bath is maintained at equal to or greater than 700 mV.

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patent: 1 074 640 (2001-02-01), None
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