[TheForge] post sand blasting

[Andrew Vida]

peter fels & phoebe palmer wrote:
> Ya sucked me in again Andy.
> Whats QPQ?

Quench Polish Quench.

Initial carbonitride process is followed with mechanical polishing (usu 
lapping), followed by another Carbonitriding.  This produces a very wear 
and corrosion resistant finish.  The problem for smithing purposes would 
lie in how to nitride large pieces.  I'm thinking the polishing may be 
accomplished with light bead blasting.
> 
> On 11/6/2010 6:03 AM, Andrew Vida wrote:
>> There is also QPQ process, which greatly increases corrosion resistance.
>>
>> The initial process is carbonitride.  The work is then mechanically
>> polished and then quenched a second time.  That second quench makes all
>> the difference.  Not sure this process would be good for anything other
>> than the smallest of smithed items, but thought I would mention it.
>>
>> QPQ'd pieces do really well in salt spray tests when compared with other
>> coatings.
>>
>> peter fels&  phoebe palmer wrote:
>>> Excellent!..thanks!
>>>
>>> On 11/5/2010 4:41 PM, Mike Spencer wrote:
>>>> pf>   Gosh...i take my reply back! Learned something.
>>>>
>>>> Here's some more.  For small items,
>>>>
>>>>       http://www.finishing.com/121/03.shtml
>>>>
>>>> Wikipedia chimes in:
>>>>
>>>>       HTTP://en.wikipedia.org/wiki/Parkerize
>>>>
>>>> And there a a lot of commercial systems, e.g.
>>>>
>>>>       http://www.p2pays.org/ref/04/03306.htm
>>>>
>>>> It's not neccessary to use manganese, zinc, vanadium or other more
>>>> exotic components, though.  Just a fibreglass or stainless tank/tray,
>>>> phosphoric acid and, if your shop is chilly outright cold, a Cal-rod
>>>> heater of some kind -- modified paint stripper, water heater element,
>>>> stock tank heater -- to keep the acid just kinda toasty-warm.  I got
>>>> onto this by seeing a heated phosphoric acid tank in Richard
>>>> Quinnell's shop, which he used for a lot of very high-end work.
>>>>
>>>>
>>>> - Mike
>>>>
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