The use of an aqueous zinc nitrite - solution and process for the preparation of the zinc nitrite - solution

摘要

The use of an aqueous zinc nitrite - solution as a promoter, in a film forming agent to the metal surface treatment, characterized in that the solution as impurities 10 ppm or less sodium (na) and 100 ppm or less sulfate - ions (so₄^2–), calculated when the aqueous solution is a concentration of zinc nitrite [zn (no₂)₂] of 10 w -%, expressed as no₂, , contains.