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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I've only read the wikipedia page on the plasma process, but it looks like it is still a 'wet chemistry' process that uses a higher voltage (sparks are involved). It produces a thicker coating which isn't porous although I suspect that a thinner layer may conduct heat better. The boric acid process produces a much thinner layer which is also not porous, although I don't know how hardness compares. Personally, I'm tempted to try the boric acid process myself.
Wikipedia article on the plasma process here:
Boric acid process is described in the pdf I posted earlier.
EDIT: I will read through the links that Storken provided, but I'll wait until I'm sober
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Dago wrote ...
Would just need to figure out the electrolyte.
"The part to be coated is immersed in a bath of electrolyte which usually consists of a dilute alkaline solution such as KOH. It is electrically connected, so as to become one of the electrodes in the electrochemical cell, with the other "counter-electrode" typically being made from an inert material such as stainless steel, and often consisting of the wall of the bath itself.
Potentials of over 200 V are applied between these two electrodes. These may be continuous or pulsed direct current (DC) (in which case the part is simply an anode in DC operation), or alternating pulses (alternating current or "pulsed bi-polar" operation) where the stainless steel counter electrode might just be earthed."
From the Wikipedia link I posted above, although as I mentioned earlier, a thinner coating like the one using borate as described in the pdf above 'may' conduct heat better, although whether it's as hard a coating as the plasma process provides is probably unlikely. I'm planning on reading up some more on this later.
EDIT: this pdf linked to by Storken has a few 'recipes' in it:
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Spark Discharge Anodizing, PEO, MAO, Keronite. Resources and Questions inside.
