Treatment solution for forming of black trivalent chromium...

Details Treatment solution for forming of black trivalent chromium... Treatment solution for forming of black trivalent chromium...

2008-08-15

2011-12-06

King, Roy (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S264000, C148S266000, C148S271000, C148S274000, C106S014050, C106S014110, C106S014440

Reexamination Certificate

active

08070886

ABSTRACT:
A treatment solution that is used to form a chemical coating of trivalent chromium free of hexavalent chromium having uniform black appearance and good corrosion resistance on the surface of zinc or zinc alloy and that attains prolongation of treatment bath lifetime; and a method of forming a black trivalent chromium chemical coating on the surface of zinc or zinc alloy. There is provided a treatment solution for forming of a black trivalent chromium chemical coating on zinc or zinc alloy, comprising trivalent chromium ions, a chelating agent capable of forming a water-soluble complex with trivalent chromium, zinc ions, a sulfur compound and phosphite ions.

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International Search Report for PCT/JP2007/052980.
European Search Report for Application No. 07714506.8 dated Jun. 29, 2011.

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