Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2006-05-09
2006-05-09
Webb, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S257000, C510S258000, C510S263000, C510S269000, C134S002000, C134S003000, C134S010000, C148S240000, C148S259000, C148S260000, C252S079400
Reexamination Certificate
active
07041629
ABSTRACT:
The inventive aqueous pickling agent on the basis of sulfuric acid or phosphoric acid and hydrogen fluoride for stainless steels, which pickling agent is free of wetting and emulsifying agents, contains (each as 100 wt-% substance)1.5 to 16 wt-% sulfuric acid or2.0 to 30 wt-% phosphoric acidas well as0.5 to 14 wt-% hydrogen fluoride and0.5 to 15.5 wt-% acid-soluble aromatic nitro compound.An iron(III) compound is not supplied to said pickling agent. Merely in the starting phase, an oxidizing agent can be supplied, which oxidizes iron(II) to form iron(III).As acid-soluble aromatic nitro compound m-nitrobenzene sulfonate and/or 3-nitrophthalate are particularly advantageous.The inventive pickling agent can be used as bath pickle and —when adding 2.5 to 5.5 wt-% magnesium and/or magnesium compound (calculated as Mg)—also as spraying pickle or brush pickle.
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Patent Abstract of Japan, vol. 005, No. 058, Apr. 21, 1981.
Schonfelder Eckart
Schwane Gunther
Werner Harald
Chemetall GmbH
Fulbright & Jaworski L.L.P.
Webb Gregory
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