Fuel cell metal bipolar plate with surface coatings

Abstract

The invention belongs to a fuel battery metal bipolar plate with a surface coat, which comprises a metal base and is characterized in that: a chromium nitride coat is arranged on the surface of the metal base; the thickness of the chromium nitride coat is 0. 5 to 10 micrometers; the chromium nitride coat is a membrane of compaction without any pinhole. The metal bipolar plate is characterized by excellent electric conduction, corrosion resistance, anti-oxidation and high temperature resistance. A layer of membrane is formed on the surface of the base by adopting a technique of ion beam surface modification so as to keep the shape and precision of the base entirely; the bipolar plate has a long-term stability and good mechanical property in the range of working electric potential on the fuel battery since the binding power between the coat and the base is high, and the coat is even and compact; the ultra-thin metal bipolar plate can be made to reduce the weight and volume of the battery pile and increase the specific power and specific energy of the battery pile. Therefore, the invention has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, in particular to a fuel cell metal bipolar plate with a surface coating. Background technique [0002] The proton exchange membrane fuel cell has the advantages of high energy conversion efficiency, high power density, no electrolyte, pure water as the product, no pollution, no charging, long life, quick start at room temperature, no noise, and convenient use. , electric bicycles, airport electric carts, power stations, mobile phones, laptop computers, emergency power supplies, highway display boards, etc., the best candidate power supply, so the research on proton exchange membrane fuel cells and related materials, especially bipolar plates It has been paid more and more attention by major companies, research institutions and countries at home and abroad. [0003] Bipolar plate technology is one of the cores of proton exchange membrane fuel cell technology. On the o...

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Problems solved by technology

Usually, precious metals such as gold are electroplated on the metal surface. On the one hand, the cost is high, and on the other hand, the electroplating process is relatively complicated, and it is not easy to be accepted in mass production.

CN1787262A patent invented a modification method of synthesizing a polypyrrole corrosion-resistant and conductive coating on the surface of a stainless steel bipolar plate, but in the synthesis process, the synthesis temperature needs to be controlled at about 0°C, light should be avoided, and nitrogen gas should be introduced Or argon for protection, the process is more complicated

US6372376 has proposed the method for coating polymer composite conductive layer on aluminum, titanium metal substrate, although this method is easy to operate, the stress concentration problem of composite conductive layer after improving electrical conductivity is not easy to solve

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