Brightening/passivating metal surfaces without hazard from...

Details Brightening/passivating metal surfaces without hazard from... Brightening/passivating metal surfaces without hazard from...

2005-02-22

2005-02-22

Wyszomierski, George (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S259000, C148S260000, C148S272000, C148S274000, C252S388000, C252S396000

Reexamination Certificate

active

06858097

ABSTRACT:
A chromium- and nitrogen-free brightening and passivating treatment for metal surfaces, particularly iron and steel, comprises: at least one acid; at least one substance containing a peroxy moiety; and at least one organic substance selected from the group consisting of; molecules that contain both at least one ether moiety and at least one hydroxyl moiety; molecules that contain at least two ether moieties; and molecules that contain in each molecule both at least one ether moiety and one nitrogen atom that is covalently bonded to at least three carbon atoms. Preferably part of the acid contains phosphorus, which has been found to act synergistically with the organic substance to stabilize peroxy compounds against decomposition, particularly in the presence of metal ions.

REFERENCES:
patent: 4437928 (1984-03-01), Wong
patent: 5354383 (1994-10-01), Bianchi
patent: 5364549 (1994-11-01), McDonogh
patent: 5417775 (1995-05-01), Pedrazzini
patent: 5843240 (1998-12-01), Pedrazzini et al.
patent: 0 816 532 (1998-01-01), None
patent: 1 449 525 (1976-09-01), None
patent: 10-158869 (1998-06-01), None
patent: WO 9932690 (1999-07-01), None
English Language Translation of Japanese Patent JP 10-158869 A, Sato et al., Jun. 16, 1998.*
Derwent WPI database. Accession No. 1998-393918 [34], abstract of JP10-158869 (1998).

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