Brightening/passivating metal surfaces without hazard from emissions of oxides of nitrogen
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United States of America Patent
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-
Feb 22, 2005
Grant Date -
Jul 3, 2003
app pub date -
Jun 28, 2002
filing date -
Dec 30, 1999
priority date (Note) -
Expired
status (Latency Note)
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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.
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