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Fuel cell metal plate coating technology developed in China will greatly improve the life of bipolar plates Hay:N01SHJZ

After the stainless steel plate of the fuel cell was coated with a high-performance coating, it was placed in a high-strength acid corrosion solution at 80°C and 1.6 volts. After 5 hours, the surface coating was still intact.

It is the fourth-generation fuel cell metal plate coating technology developed by SHJZ Hydrogen Energy Technology Corporation, which can reduce the corrosion current of the fuel cell metal bipolar plate to 5μA/cm. The current level of bipolar plate corrosion current in the same test environment in the industry It is 50~300μA/cm, which means that the "new coating" can at least increase the life of the bipolar plate to more than 30,000 hours, which is an industry-leading level.

The number of first invention patents for fuel cell metal bipolar plate coating obtained by SHJZ leads the country. "The new high-performance coating we developed has reduced the coating processing cost of metal plate stacks by 60%, and the cost of coating in bipolar plates accounts for 70-80%.


The stack is the power system of a hydrogen fuel cell vehicle, which is converted into electrical energy through the electrochemical reaction of hydrogen and oxygen electrodes, which largely determines the performance, life and cost of the vehicle. If the stack is the most difficult and the highest technical barrier in the development of hydrogen fuel cell vehicles, then the metal bipolar plate coating can be called "the difficulty of the difficult points".

Metal plates are considered to be an ideal fuel cell bipolar plate technology route due to their advantages of small size, light weight, good gas barrier properties, and low mass production cost, which help to improve the power density and commercial competitiveness of the stack.


However, in the process of the chemical reaction of the stack, the bipolar plate plays the role of separating the hydrogen and oxygen electrodes and conducting current and heat, and the surface of the bipolar plate is inevitably corroded by the electrochemical reaction. The reduction of electrical output performance will also shorten the life of the metal bipolar plate, thereby affecting the life of the stack, and even the perforation of the metal plate in severe cases, which is extremely dangerous.


Coating technology is to slow down and prevent the corrosion of metal bipolar plates by electrochemical reaction, which affects the two important indicators of durability and conductivity of metal bipolar plates, and has become the core technology in the manufacturing process of metal bipolar plates.


Conventional anti-corrosion materials are almost non-conductive, and conductive materials are not anti-corrosion in the acidic electrochemical environment of fuel cells. In nature, only precious metals such as gold and platinum have both anti-corrosion and conductive functions, but they are not suitable for commercial applications due to their high prices.


The preparation of coating materials with corrosion resistance, electrical conductivity and low cost under the operating conditions of hydrogen fuel cells has become a worldwide problem that restricts the application of metal plates in the field of fuel cells, which in turn restricts the industrialization process of fuel cells.

"Coating technology involves multiple links such as materials, structures, processes, and equipment. It seems that the coating is only a few microns, but it is a huge and complex system engineering."

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