[Jewelry making - Article 00302] - Re: [Orchid] Inert environment in the kiln

[James Binnion]

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>     I wouldnt recommend CO2 as it can break down to carbon monoxide
>     upon oxidation reaction with metals etc. Nitrogen will react with
>     some molten metals (esp Al) so the best gas is argon. This is not
>     expensive, the cylinder rental usually works out more. 

    Nick, I am not a chemist but was under the impression that the
    reaction series was carbon and oxygen forming CO (carbon monoxide)
    which is strongly reducing and will grab any available oxygen or
    oxide to convert to CO2 a more stable form of carbon oxide not the
    other way around. 

    CO2 will combine with moisture which is always going to be present
    on any surface and form carbonic acid which is a very weak acid but
    corrosive none the less and will lead to unclean corroded metal
    surfaces. 

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