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Problem in zinc phosphate coating bath

I need help for zinc phosphate coating. I prepare bath for zinc phosphate coating(the bath include nitric acid, phosphoric acid, zinc oxide ⇦this on eBay or Amazon [affil links] )then I dip ferric plates in the bath. After ten minutes darkgreen-black clour and particles appear and to remain in the bath. However After my work finish, I give air to the bath and the clour and particles disappeared. I know something is oxidizing but what?

Thank you for your help.

Omer Korkut
engineer - Bursa, Marmara, Turkey
2004

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