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Specialty Chemistry Forums => Chemical Engineering Forum => Topic started by: mrhuyanh on May 31, 2016, 09:28:09 PM

Title: Zinc phosphate technology for powder coating
Post by: mrhuyanh on May 31, 2016, 09:28:09 PM

I made Zinc phosphate for surface metal, iron. But when I test it in the tank, all of surface has yellowing. I watched at youtube, it has spray, smooth.
I made it by ZnO + H3PO4 + HNO3 + NiSO4.
Their surface are cleared oil.
Please help me.
Many thanks.

Title: Re: Zinc phosphate technology for powder coating
Post by: Enthalpy on June 04, 2016, 06:02:57 PM

Does something prevent the iron surface react wit the phosphoric and nitric acids? Phosphates are commonly produced on steel as a protection against corrosion, and they are deep black.

Title: Re: Zinc phosphate technology for powder coating
Post by: P on August 03, 2016, 07:30:28 AM

Zinc Phosphate is pretty nasty to the environment too. Some more modern anti corrosives include:

ATP (Aluminium TriPolyPhosphate) - which is 3 times as effective as Zinc Phosphate as each molecule has 3 phosphate groups to mop the electrons.

Graphene powder - nano graphine plates included at very low levels in primers for steel are apparently showing greatly improved electron scavaging and anti rust performance.

Hope that helps - ATP is readily available. Graphene is still experimental and will cost a bomb to get samples for testing, but you don't need much of it.