White list passivation chemical, toner, inhibitor

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 ⇦ on Amazon [affil link] 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.

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.