[TheForge] post sand blasting

[Andrew Vida]

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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