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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Electrolytic Derusting, Baking Soda or Washing Soda?
Michael Koblic wrote: (snip) It works, 'cos I done it. What I do not understand how is the de-rusting process different in that it dissolves the iron oxides preferrentially. Is the underlying iron spared? I would have thought that the process is not dissimilar from the above and there will be some dissolution of the non-rusted iron but my chemistry does not stretch that far. -- Michael Koblic Campbell River, BC I STR reading somewhere that the red oxides get converted to black oxides - my experience has been that most of the black stuff just rinses off and a couple swipes with a wire brush takes the rest of it off. Mikel |
#2
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Electrolytic Derusting, Baking Soda or Washing Soda?
mike wrote in
: I STR reading somewhere that the red oxides get converted to black oxides - my experience has been that most of the black stuff just rinses off and a couple swipes with a wire brush takes the rest of it off. The old fashioned way of producing black iron oxide finishes on firearms was "rust" bluing. You chemically rust the surface, which gets you Fe2O3 (the red stuff). You then boil the part, which converts it to black iron oxide (Fe3O4). Rinse & repeat. Black iron oxide is like anodizing, in that it seals the surface & is non-porous. It also doesn't flake off the way the red stuff does, so once you've got a good coating of the black stuff, it won't rust anymore. You can get rust blue chemicals from gunsmithing suppliers like Brownells. I did a piece on my Clausing mill with some, and although it took a while to process, it looks great and hasn't rusted a bit. Doug White |
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