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White list passivation chemical, toner, inhibitor

2003

Dear respected one,

I want to know , whether better alternative hexavalent chromium passivation. Zirconium passivation is it ok ? for phosphating post passivation. there is any alternative toner chemical for controlling iron content in phosphating bath. since Sodium Nitrate [affil links] chemical is hazardous one. In our fasteners phosphating process, in pickling we have maintain HCl concentration 60- 100 g/ liter in HCl whether we can use inhibitor for this?

Please reply some experts at the earliest.

S.THIRUNAVUKKARASU
SFL - PONDY, PONDICHERRY, India

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I happened to visit an automobile factory recently and they informed me that they are using Zirconium for passivation of the car body. I do not have more information. However, I guess that you also have parts which go in automobile, hence it should work. What I want to know is, where do you get the supplies of this chemical.

Good luck.

GR Patel
- Vadodara, India
2003