| 摘要 |
PROBLEM TO BE SOLVED: To provide a nickel nitrite aqueous solution which has the reduced content of sodium ions as impurities, does not substantially contain sulfuric acid ions and enables surface treatment for metal with extremely satisfactory efficiency. SOLUTION: As the content of impurities in the solution when the concentration of the nickel nitrite [Ni(NO<SB>2</SB>)<SB>2</SB>] aqueous solution is expressed in terms of 10 wt.% as NO<SB>2</SB>, the concentration of sodium (Na) ions is 200 to 2,000 ppm, and the concentration of sulfuric acid (SO<SB>4</SB>) ions is≤20 ppm. The nickel nitrite aqueous solution can be produced by using a nickel compound and an alkali nitrite as raw materials, and causing electrolytic synthesis by metathesis reaction with an ion exchange membrane as a diaphragm. COPYRIGHT: (C)2004,JPO
|
