Patent ID: 7699926
Filing Date: 2010-04-20
Classification: C23C

Abstract:
1. A chrome-free passivating solution, characterized in that said chrome-free passivating solution comprises the following components: effective amount of oxysalt containing transition metal, inorganic acids; and water; wherein said oxysalt containing transition metal is selected from a group consisting of oxysalt containing titanium, oxysalt containing zirconium, oxysalt containing hafnium, oxysalt containing vanadium, oxysalt containing niobium, oxysalt containing tantalum, oxysalt containing molybdenum, oxysalt containing tungsten, oxysalt containing manganese, oxysalt containing technetium, and oxysalt containing rhenium, and the weight ratio between said oxysalt containing transition metal and inorganic acids is in the range of 200˜400:1.