Pickling agent containing urea and method of producing it

Details Pickling agent containing urea and method of producing it Pickling agent containing urea and method of producing it

2005-01-18

2005-01-18

Ogden, Necholus (Department: 1751)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

For cleaning a specific substrate or removing a specific...

C510S499000, C134S041000, C134S003000

Reexamination Certificate

active

06844304

ABSTRACT:
A long-time stable pickling agent for the removal of an oxide layer on a stainless steel after heat treatment, such as welding, which pickling agent comprises nitric acid and fillers and constitutes of a pickling paste or pickling gel to be coated on the heat treated stainless steel, or of a pickling liquid to be sprayed on the steel. According to the invention, the pickling agent also comprises urea for reduced formation of nitrous fumes when the pickling agent is used.

REFERENCES:
patent: 3598741 (1971-08-01), Kanno et al.
patent: 5266410 (1993-11-01), Lindert et al.
patent: 3412329 (1985-10-01), None
patent: 2 048 311 (1980-12-01), None
patent: 8305648-1 (1983-10-01), None
patent: WO 9535397 (1995-12-01), None
Oda Terumi et al.; Scale removal from stainless steel pipe—by immersing pipe in aq. soln. contg. nitric acid, hydrofluoric acid and urea; J54056939; May 8, 1979.
Shimogoori Kazutoshi et al.; Pickling metal, e.g., titanium or stainless steel—in soln. contg. nitric acid, hydrofluoric acid and urea or sulphamic acid, with controlled prodn. of undesired nitrogen oxide; JP61015989 A; Jan. 24 1986.
Kotake Masayoshi et al.; Reagent for inhibiting generation of nitrogen oxide—from nitric acid pickling bath, contains sulphuric acid, acidic ammonium sulphate, urea and sulphuric acid; JP57019385 A; Feb. 1, 1982.

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