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.

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