The authoritative public forum
  for Metal Finishing 1989-2025
  

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Chrome-Free Passivation

Hello every body

I am a student of coatings technology and I am working on a project on passivation in automotive industry.

In my country we have chrome-free passivation and instead of chromium acids we use zirconium salts.

Could anyone help me on the mechanism of this process?

Arezoo Razavi
- Tehran,Iran
2000

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Dear Mr. Razavi-

Zirconium along with other film formers will passivate zinc, the result is a clear and not very corrosion resistant finish. How many hours of salt spray does your zirconium provide?

Regards,

Martin Straus, Owner
- Chicago Illinois USA
2000

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Hello:

I'm a chemical engineering student working on my end of degree project. It would be very useful for me if somebody could give me some information about the free-chromium passivation process in the automotive industry using titanium salts. Topics like mechanism, cost, effluent treatment and required modifications for using titanium on a chromium passivation process are what I'm looking for.

Thank you,

Pablo RodrÌguez
- Vigo, Spain
2001