Aqueous solution of zinc nitrite and method for production...

Details Aqueous solution of zinc nitrite and method for production... Aqueous solution of zinc nitrite and method for production...

2006-08-01

2006-08-01

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

C204S523000, C204S529000

Reexamination Certificate

active

07083772

ABSTRACT:
An aqueous zinc nitrite solution which contains substantially no calcium (Ca) ions is provided, in which, in terms of the aqueous zinc nitrite [Zn(NO2)2] solution having an NO2concentration of 10% by weight, the sodium (Na) ion concentration is 200 to 2000 ppm and the sulfate (SO4) ion concentration is 20 ppm or less in the solution. The aqueous zinc nitrite solution can be prepared by providing a zinc compound and an alkali nitrite as raw materials and subjecting the raw materials to electrolytic synthesis through a double decomposition reaction using an ion-exchange membrane as a diaphragm. As the aqueous zinc nitrite solution is provided, an extremely efficient metal surface treatment is made possible which has a reduced amount of sodium ions. In particular, it contains substantially no sulfate ions and no calcium ions.

REFERENCES:
patent: 6572834 (2003-06-01), Kinose et al.
patent: 2000-44224 (2000-02-01), None
patent: 2001-323384 (2001-11-01), None
patent: 2001-323386 (2001-11-01), None

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