A kind of fuel cell bipolar plate and preparation method thereof

Abstract

The invention discloses a fuel cell bipolar plate and a preparation method thereof, comprising a metal substrate and a coating covering the surface of the substrate, the surface of the metal substrate is doped with nitrogen, and the coating includes an electroless nickel layer and electroplated nickel copper Alloy layer; pretreatment, nitrogen-doped treatment, electroless nickel plating, electroplating nickel-copper alloy layer on the metal substrate. The surface coating of the fuel cell bipolar plate of the present invention is uniform and dense, the coating is well bonded to the substrate, is not easy to fall off, has good corrosion resistance and stability in the fuel cell environment, and has a convenient and reliable preparation process and low cost.

Description

technical field

[0001] The invention relates to a bipolar plate and its preparation method, in particular to a fuel cell bipolar plate and its surface coating preparation method. Background technique

[0002] Proton exchange membrane fuel cell has the advantages of high efficiency, energy saving, safety and environmental protection, such as: it can operate at a lower temperature (<100°C), has a high energy conversion efficiency (40% to 60%), and does not work To generate noise, the battery efficiency can be adjusted by changing the single battery pack. Its single cell consists of a proton exchange membrane, electrodes and conductive bipolar plates. The proton exchange membrane only conducts protons, so hydrogen protons can pass directly through the proton exchange membrane to the cathode, while electrons arrive through an external circuit, where the bipolar plate as electron transfer accounts for more than 40% of the battery cost. Therefore, various methods of chemicall...

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