Originally Posted by thummmper

a process that uses phosphoric acid to sort of anodize steel for corrosion prevention. firearm and milspec companies use it on everything.
the industrial process involves bead blasting and dipping in 190*f acid solution for 7 minutes or until the bubbles stop. the anode and cathode are chemical, not electrical. I have seen people use electricity to remove rust like electrolysis, but that's not required here-
the home grown lo tech version sloshes a quart of 85% phosphoric acid inside the tank for the full strength effect [for a few minutes]-- then it gets topped off with tapwater and left to bubble for a couple of days [24-48 hours]. I used the drain I had put in to fill a 5 gal bucket at the end and poured baking soda in to neutralize. then it goes down the drain, unless you want to use it for other parts.
I knew none of this 2 weeks ago. now I are one!