Immersion tests for phosphorous deoxidized copper (PDC) and oxygen-free copper (OFC) tubes were conducted to investigate ant nest corrosion that developed in copper formate and copper acetate solutions. Test solutions with copper formate and copper acetate concentrations of 0.001, 0.01, and 0.1 mol/L were prepared. The copper tubes were taken from the solutions at 28, 56, and 84 days for optical and scanning electron microscopy on the cross-sectional surfaces of the specimens. Typical ant nest corrosion with randomly branched pits occurred in both PDC and OFC tubes immersed in 0.001, 0.01, and 0.1 mol/L copper formate solutions. Conversely, a hemispherical single pit developed in both PDC and OFC tubes immersed in only 0.1 mol/L copper acetate solution. SEM observation revealed that the corrosion pit areas that developed in both the copper formate and copper acetate solutions were composed of metallic copper with fine spongelike pores. [ABSTRACT FROM AUTHOR]
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