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Carbonate removal post-electrolysis

JB1220

Plastic
Joined
Oct 11, 2011
Location
PA, USA
Greetings,

Has anyone had success using sodium sesquicarbonate as suggested by Donny Hamilton et al. at Texas A&M to remove the black deposits that can happen during electrolytic rust removal?

“If carbonate does precipitate on an object, it is usually impossible to brush off or remove by electrolysis; rather, it can be eliminated by soaking the artifact for several days in a 5 percent solution of sodium sesquicarbonate or sodium hexametaphosphate. Sodium sesquicarbonate complexes with the insoluble calcium or magnesium salts to form soluble salts in the same manner as sodium hexametaphosphates (Plenderleith and Werner 1971:253).“

Thanks,
Tim

Page 59:
https://nautarch.tamu.edu/CRL/conservationmanual/ConservationManual.pdf
 








 
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