Abstract
Wires formed of densified as-received and purified commercially available Carbon Nanotube (CNT) sheet material as well as a laid CNT wire were tested for long-term stability in a saltwater environment under an applied electrical bias. Tafel electrochemical measurements showed increased chemical stability for the CNT samples over copper, with the corrosion resistance of CNT samples showing further improvement after purification. Under constant DC voltage biases of 2.50 V, CNT materials show improvements in failure time by as much as 108 times over comparable diameter copper wires, with further improvement over copper at lower applied voltages due to material stability and an absence of gas evolution. Shear forces resulting from gas formation was found to significantly contribute to the failure of CNT wires at elevated voltages compared to chemical corrosion typical in copper wires.
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