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Nanocrystalline ZrC/Zr composite coating of metal bipolar plate of proton exchange membrane fuel cell and preparation method thereof

A technology of titanium alloy bipolar plate and proton exchange membrane, which is applied in the direction of metal material coating process, coating, ion implantation plating, etc., can solve the problem of waste liquid polluting the environment, affecting the durability and safety of coated bipolar plates, Reduce the corrosion resistance of the silver-plated stainless steel layer and achieve the effects of simple process, low coating preparation cost and excellent surface conductivity

Inactive Publication Date: 2015-05-13
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the above methods often have some shortcomings, such as the waste liquid produced by electroplating pollutes the environment, and the modified layer of chemical vapor deposition, physical vapor deposition and ion plating often has metallurgical defects, which reduces the corrosion resistance of the stainless steel silver plating layer to a certain extent. Performance, which seriously affects the durability and safety of the coated bipolar plate

Method used

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  • Nanocrystalline ZrC/Zr composite coating of metal bipolar plate of proton exchange membrane fuel cell and preparation method thereof
  • Nanocrystalline ZrC/Zr composite coating of metal bipolar plate of proton exchange membrane fuel cell and preparation method thereof
  • Nanocrystalline ZrC/Zr composite coating of metal bipolar plate of proton exchange membrane fuel cell and preparation method thereof

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Embodiment 1

[0033] A method for preparing a titanium alloy bipolar plate nanocrystalline ZrC / Zr composite coating for a proton exchange membrane fuel cell, comprising the steps of:

[0034] (1) Ultrasonic cleaning of Ti-6A1-4V bipolar plate (titanium alloy bipolar plate substrate) after fine grinding with sandpaper;

[0035] (2) Put the ultrasonically cleaned titanium alloy bipolar plate as a workpiece into a double-cathode plasma sputtering deposition furnace, connect it to a controllable cathode device; connect the sputtering target to another controllable cathode device ;The distance between target and workpiece is 10mm;

[0036] (3) Vacuumize the double-cathode plasma sputtering deposition furnace to 5×10 -3 Pa, pass the argon gas with a gas flow rate of 30sccm to 40sccm into the furnace to keep the pressure in the furnace at 35Pa;

[0037] (4) Use a Zr powder metallurgy sintered plate with a purity of 99.99% as the sputtering target, open the cathode connected to the target and the...

Embodiment 2

[0045] Another set of process parameters is adopted: the distance between the target and the workpiece is 16mm, the air pressure in the double-cathode plasma sputtering deposition furnace is 40Pa, the sputtering deposition conditions of the Zr sintered plate are: target voltage 700V, target current 0.9A, workpiece The voltage is 250V, the workpiece current is 0.5A, the deposition temperature is 700°C, and the deposition time is 1.5 hours; the sputtering deposition conditions of the ZrC sintered plate are: target voltage 750V, target current 0.9A, workpiece voltage 250V, workpiece current 0.5A, The deposition temperature was 650°C, and the deposition time was 1.5 hours to obtain a nanocrystalline ZrC / Zr composite coating deposited by sputtering on the surface of the Ti-6A1-4V bipolar plate.

[0046] The nanocrystalline ZrC / Zr composite coating prepared in this embodiment is composed of an outer ZrC deposition layer (the mass fraction of ZrC is greater than 98%) with a thickness ...

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Abstract

The invention belongs to the field of proton exchange membrane fuel cells, and relates to a nanocrystalline ZrC / Zr composite coating of a metal bipolar plate of a proton exchange membrane fuel cell and a preparation method thereof. Bicathode plasma sputtering deposition equipment is employed for sputtering the nanocrystalline ZrC / Zr composite coating on the surface of a titanium alloy bipolar plate used for the proton exchange membrane fuel cell. The coating is composed of an outer layer ZrC deposition layer and inner layers Zr deposition layer and diffusion layer; and the ZrC deposition layer is composed of equiaxial nanocrystalline ZrC with the average dimension of about 15-20 nm, the diffusion layer is formed by mutual diffusion of alloy elements of the Zr deposition layer and the titanium alloy bipolar plate, and the alloy elements in the diffusion layer show gradient distribution. The nanocrystalline ZrC / Zr composite coating possesses high density, has strong combination force with a titanium alloy substrate, has high corrosion resistance and low contact resistance when being in a proton exchange membrane fuel cell work environment, and is capable of satisfying usage requirements of a fuel cell bipolar plate.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, and in particular relates to a nanocrystalline ZrC / Zr composite coating on a titanium alloy bipolar plate of a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] The survival and sustainable development of human beings in today's world are facing severe challenges such as energy shortage and environmental pollution caused by excessive use of energy. The optimal utilization of energy and the development of clean and safe new energy have become a top priority. As a high-efficiency and clean power generation technology, fuel cells can directly convert the chemical energy of active materials into electrical energy through electrochemical reactions. With the advantages of emitting nitrogen and sulfur oxides and lower carbon dioxide emissions, it is known as the fourth generation of power generation devices after hydropower, thermal pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/36C23C14/16C23C14/06
Inventor 徐江
Owner WUHAN INSTITUTE OF TECHNOLOGY
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