Research on Potentiostatic Accelerated Test Method for Fuel Cell Metal Bipolar Plate

Abstract

The development of high corrosion resistance and low contact resistance fuel cell metal bipolar plates is the focus of current research in the field of fuel cells. In order to test the performance of metal bipolar plates more accurately and rapidly, it is necessary to further study and discuss its effective test methods. Based on the electrochemical corrosion mechanism and the high potential state existing in the fuel cell, this paper studied the state of the metal bipolar plate under different corrosion stages by changing the electrochemical test parameters. The combination of high potential and an accelerated solution has a significant acceleration effect. By increasing the test potential, metal corrosion can be accelerated, and the surface morphology, corrosion products, corrosion rate and contact resistance of the sample under different corrosion stages can be observed or analyzed in a short time. As shown in the experiment, the method of " potentiostatic i-t curve versus time integral" proposed in this paper can more accurately quantitatively analyze the long-term corrosion resistance of samples under different working conditions. In addition, according to the test results of this paper, if the fuel cell is in a long-term high interface potential situation such as fuel starvation, the fuel cell metal bipolar plate, and its coating will be seriously damaged, the contact resistance will increase significantly, and the surface morphology will be seriously damaged. Figure 1