Superconducting and super corrosion resistant functional coating for fuel cell metal bipolar plate and preparation method thereof

A metal bipolar plate, fuel cell technology, applied in metal material coating process, battery electrode, coating and other directions, can solve the problems of inability to meet civilian promotion, rapid increase in surface resistance, and failure to meet the standards for battery use, etc. Achieve the effects of low corrosion current density, low contact resistance, and reduced processing costs

Active Publication Date: 2017-10-27
常州翊迈新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the weight problem of the bipolar plate has been effectively improved, but the base material of the plate with a lightweight design is mostly stainless steel or titanium alloy, which is easy to passivate the surface, so its surface resistance is likely to increase rapidly in the battery environment. As a result, the standard for battery use has not been met, and a large number of coatings and modification technologies for surface modification of metal plates have appeared. Although some methods have indeed effectively improved the conductivity of the surface of the plate, and at the same time improved The durability of the plate is improved, including the use of multi-layer design to fill pinholes, the introduction of precious metals to improve corrosion resistance, and the use of special methods to improve the density of the coating, etc. Even so, the best technology at present can only meet the needs of fuel cells. 3000 hours, still unable to meet the level of civilian promotion

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  • Superconducting and super corrosion resistant functional coating for fuel cell metal bipolar plate and preparation method thereof

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preparation example Construction

[0030] A preparation method for claiming a fuel cell metal bipolar plate superconducting supercorrosion-resistant functional coating, the self-healing layer 2 of the coating material, the supercorrosion-resistant layer 3 and the superconducting layer 6 that can be deposited selectively are The one-time deposition is completed in the magnetic filter arc ion plating equipment equipped with a hot wire assisted ion source. The targets of the coating equipment are distributed on both sides of the vacuum furnace body, and there are at least 3 target assembly positions on the same horizontal plane, one of which is Install titanium alloy doped target or tungsten alloy doped target, and install tungsten alloy doped target or titanium alloy doped target and graphite target on the other side, including the following process steps:

[0031] Step 1: Pre-treatment of the workpiece: put the workpiece into the ultrasonic cleaning equipment for ultrasonic degreasing cleaning, pure water ultraso...

Embodiment 1

[0038] The alloy components that make up the super corrosion-resistant layer are alloy nitrides and oxides containing 5wt% tungsten, and other additives can be one or more of titanium, vanadium, niobium, chromium, and zirconium, such as tungsten and titanium, tungsten Binary, ternary or even multi-component alloys composed of vanadium, tungsten and niobium, tungsten and tantalum and chromium, such as alloys composed of 5wt% tungsten, 10wt% niobium, and 85wt% chromium, the coating thickness is 30nm, it is worth explaining The self-healing layer and the super-corrosion-resistant layer are obtained by PVD method, including multi-arc ion coating technology, magnetron sputtering coating technology, and evaporation coating technology, and are not limited to one of them.

[0039] Put the workpiece into the ultrasonic cleaning equipment and perform ultrasonic degreasing cleaning, pure water ultrasonic cleaning, pure water rinsing, water removal, hydrocarbon solvent vacuum ultrasonic cl...

Embodiment 2

[0046] The titanium alloy component of the corrosion-resistant transition layer is a titanium alloy containing 60wt% titanium, wherein titanium is a β phase, and other additives can be one or more of vanadium, tantalum, nickel, chromium, and zirconium, such as titanium and Binary, ternary or even multi-component alloys composed of vanadium, titanium and tantalum, titanium and chromium, titanium and chromium and nickel, such as alloys composed of 60wt% titanium, 20wt% vanadium and 20wt% chromium, and the formed alloy is BCC structure, another alloy that forms the self-healing layer, the composition contains 60wt% tungsten, and other additives can be one or more of titanium, vanadium, niobium, chromium, zirconium, such as tungsten and vanadium, tungsten and Titanium, tungsten and zirconium, tungsten and niobium and chromium, etc., such as an alloy composed of 60wt% tungsten, 10wt% niobium, and 30wt% chromium.

[0047] Put the workpiece into the ultrasonic cleaning equipment and ...

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Abstract

The invention relates to the technical field of fuel cell functional coating, in particular to a superconducting and super corrosion resistant functional coating of a fuel cell metal bipolar plate and a preparation method thereof. The superconducting and super corrosion resistant functional coating of the fuel cell metal bipolar plate comprises a self-healing layer, a super corrosion resistant layer and a selectively deposited superconducting layer. The premise of the superconducting and super corrosion resistant functional coating of the fuel cell metal bipolar plate is enhancing the service life of the fuel cell metal polar plate. The superconducting and super corrosion resistant functional coating material of the fuel cell metal bipolar plate disclosed by the invention has the capability of filling the pinholes automatically during use, therefore, a recycle multilayer structure to avoid the pinholes is not required to design; meanwhile, the coating has the super corrosion resistant and the superconducting compositions, therefore, the lower contact resistance and corrosion current density compared with the prior art can be achieved without adding noble metals, and the processing cost of the metal plate is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of fuel cell functional coatings, in particular to a superconducting and super-corrosion-resistant functional coating of a metal bipolar plate of a fuel cell and a preparation method thereof. Background technique [0002] As a synonym for the innovation of new energy vehicles in the 21st century, proton exchange membrane fuel cells have market promotion prospects that cannot be replaced by pure electric vehicles and are of great significance in improving the global environment. Pollutant discharge and battery recycling do not have the environmental pollution issues that pure electric vehicles need to consider. Therefore, countries around the world are scrambling to develop their related technologies, among which the selection of bipolar plate materials for fuel cells and the research and development of surface modification methods are particularly prominent, because bipolar plates are the core components of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88C23C14/32C23C14/16C23C14/06C23C14/08
CPCC23C14/0605C23C14/0641C23C14/08C23C14/16C23C14/325H01M4/86H01M4/88H01M2004/8694Y02E60/50
Inventor 韩治昀高华魏科科
Owner 常州翊迈新材料科技有限公司
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