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Letter 38030
Olive drag passivation [South
Africa]
+++++
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 temparatures
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.
Tommy van Rensburg
fasteners for various industries - Alberton North, Gauteng, South
Africa
+++++
Tommy
Stay with the Patented solutions and focus more on drying below 70
Centigrade 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 centigrade most Passivated films lose their color and de
hydrate.
There is one Trivalent Chromate that does accept 180 centigrade and
it is proprietary in nature and should be available in your country.
The color of the finish is light green but I cant name the maker as
this is not permitted here.
Regards,
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