配方类型:

METALS AND THEIR TREATMENT

配方说明:

Pretreating Aluminum for Painting

配方组成:

Water/1 liter
Zinc Carbonate/71 g.
Chromic Acid/140 g.

配制方法:

Mix until dissolved and add gradually to a 2% gelatin solution until the pH is between 4 and 5.
Degrease the surface; clean chemically or mechanically; and passivate by this solution.