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 03-27-2009, 15:08 Post: 161464
AnnBrush



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  Chinese drywall outgassing sulfur compounds

Copper Oxidation - from 2 separate sources:
1):
Cu metal atoms react with oxygen to form the pink oxide, cuprite, Cu2O, which has Cu+1 cations. This oxidizes further to the black oxide, tenorite, CuO, with Cu+2 ions. The black sulfide CuS also sometimes forms. In the presence of moisture, the blackish layer slowly reacts with sulfur dioxide and carbon dioxide from the air to eventually form patina, which is a mixture of 3 minerals:

brochantite, a green, hydrated copper sulfate, Cu4SO4(OH)6
malachite, the green, hydrated copper carbonate Cu2CO3(OH)3
azurite, the blue, hydrated copper carbonate Cu3(CO3)2(OH)2

In these compounds, copper atoms from the metal surface have been fully oxidized into Cu+2 (cupric) ions.

2):
A black layer of copper sulfide forms on copper metal exposed to hydrogen sulfide (emitted from the drywall). This layer is replaced by the green coating of basic copper sulfate (patina - CuSO4.3Cu(OH)2. Both such layers of corrosion seriously impair the function of copper contacts on electrical equipment.






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 04-01-2009, 08:54 Post: 161594
AnnBrush



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  Chinese drywall outgassing sulfur compounds

Not that I know of - you have problematic compounds in close proximity. The usual response is to remove one of them.






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