Electrolytic method for after-treatment of carbon fiber

摘要: A method for after-treatment of carbon fiber, which comprises by electrolytic oxidation treatment in an aqueous solution having ammonium ion concentration 0.2 to 4.0 mol/l and a pH at least 7 using the fiber as anode, followed treating resulting water with ultrasonic wave 20 kHz frequency intensity satisfying condition: ##EQU1## wherein, F is (kHz) T period (min) provided that T>0.1.