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copper carbonate

1. n. [Drilling Fluids]
A compound, CuCO3, that was used as a sulfide scavenger for water-base muds. However, it was found to be corrosive due to spontaneous plating of metallic copper onto metal surfaces, causing pitting corrosion; it has largely been replaced by zinc compounds.
Reference:
Perricone AC and Chesser BG: "Corrosive Aspects of Copper Carbonate in Drilling Fluids,"
Oil & Gas Journal 68, no. 37 (September 14, 1970): 82-85.