[TheForge] post sand blasting

[peter fels & phoebe palmer]

Ya sucked me in again Andy.
Whats QPQ?

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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