| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a pretreatment method of a separator that enables to produce a assembled fuel cell which has no initial operation trouble and can maintain stable generating capacity from operation start, by applying a pretreatment after processing of a separator constituting a unit cell of the fuel cell. <P>SOLUTION: The separator after completion of processing is set in a vibrating tank, and a pure water with a conductivity of 5 μS/cm or less or a mixture of pure water and ethanol having a conductivity of 5 μS/cm or less is supplied to the vibrating tank, and ultrasonic vibration with an oscillation frequency 20-50 kHz and an effective ultrasonic power density of 5-20 kW/m<SP>3</SP>is applied for 30 minutes. This ultrasonic vibration is applied three times while exchanging the water solution, and by applying working-up cleaning, the pretreatment process is completed. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
