[Jewelry making - Article 00436] - Re: [Orchid] Greenish color with magnetic polishing

[James Binnion]

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>     Let me be clear: the pins are not stain-less, they do rust. Really.
>     I have perhaps 7 years experience with pin finishers. I've left the
>     pins in the solution far too long at times with results similar to
>     Rahuls problem. Cleaning with Coca-cola works Q.E.D. I won't argue
>     the point that there are magnetic "stainless steel" alloys out
>     there. Fact is: the pins rust. 

    Let me be clear, the fact is that all stainless steel rusts. From
    the Wikipedia entry on stainless steel: 

          In metallurgy, stainless steel (inox) is defined as a ferrous
          alloy with a minimum of 10% chromium content.[1] The name
          originates from the fact that stainless steel does not stain,
          corrode or rust as EASILY as ordinary steel." 

    Given the right circumstances, and the abrasive action of the pins
    and work rubbing on each other and the alkaline nature of the soaps
    set this up nicely. The phosphoric and citric acids in the cola
    remove the rust. 

    With regards to magnetism here is the scoop from 
    http://www.azom.com/ details.asp?ArticleID=1140 

          Magnetic permeability is the ability of a material to carry
          magnetism, indicated by the degree to which it is attracted to
          a magnet. All stainless steels, with the exception of the
          austenitic group, are strongly attracted to a magnet.

    Fact is pins do rust and they are stainless steel 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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