1. Deoiling must choose weak alkali deoiling, can not contain sheet alkali ingredients, TAL to operate at around 15POINT, pH can not exceed 12.
2 pickling passivation process can choose hydrochloric acid pickling passivation, pickling passivation time is not too long, the application of ammonium sulfate is just right.
3. Please use 1~2 sodium carbonate after pickling and passivation.
4. Surface adjustment of organic chemical materials such as hydrochloric acid, the application of concentration value of 1~2 degrees can be.
5 zinc pickling phosphating acid value should be limited, prepreg solution try: TA: 45 or so, FA: 1.3AC: 8 (20cc alcohol tube).
6. Each hand washing project must not be cleaned up, hand washing to maintain overflow.
