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| 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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