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-----Olive drag passivation
2005
I am looking for the make-up of an olive drab passivation solution. Yes, there are several patented solutions on the market, but, somewhere somebody must have one of the old reliable make-up methods.
My application is for ammunition boxes (we manufacture the hinges, zinc plate, olive drab passivate, cure and then send for KG Gunkote). The curing temperature (150 °C) is my major concern due to the fact that passivated surfaces should not be subjected to temperatures above 60 °C.
A lot of work still lies ahead before our process can be "qualified", and the more methods we have to experiment with the better.
fasteners for various industries - Alberton North, Gauteng, South Africa
2005
Tommy
Stay with the Patented solutions and focus more on drying below 70 °C which is right for OD passivate.
If perhaps you need to Hydrogen De Embrittle, ensure the parts are passivated after the de embrittlement process.
At 150 °C most Passivated films lose their color and de hydrate.
There is one Trivalent Chromate that does accept 180 °C and it is proprietary in nature and should be available in your country. The color of the finish is light green but I can't name the maker as this is not permitted here.
Regards,
Asif Nurie [deceased]
- New Delhi, India
With deep regret we sadly advise that Asif passed away on Jan 24, 2016
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