It is known that ant nest corrosion of copper occurs under the environment derived from carboxylic acid such as formic and acetic acids. However, few studies on corrosion behavior of a high strength copper （HSC） tube C1862 in the carboxylic acid environment have been carried out. This study investigated the corrosion behavior of HSC tubes in 0.001, 0.002 and 0.01 M formic and acetic acid solutions. Also, the immersion tests of HSC tubes in copper formate and copper acetate solutions were conducted to accelerate the initiation and propagation of corrosion. Ant nest corrosion with randomly branched pits occurred in the phosphorous deoxidized copper （PDC） tubes immersed in 0.01 M formic and acetic acid solutions, while hemispherical pits occurred in the HSC tubes. The corrosion morphology of PDC and HSC tubes immersed in 1000 ppm copper formate solution for 63 days were ant nest corrosion and hemispherical pits, respectively. Both PDC and HSC tubes immersed in 1000 ppm copper acetate solution for 84 days were corroded hemispherically
