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Ion plating modified method for bipolar plate of stainless steel for fuel cell in type of proton exchange membrane

A proton exchange membrane and fuel cell technology, applied in fuel cells, battery electrodes, circuits, etc., can solve problems such as increased manufacturing costs, affecting battery output power and service life, and unfavorable commercial production

Inactive Publication Date: 2007-12-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion resistance of stainless steel in the fuel cell environment is relatively poor, and the corrosion products will poison the proton exchange membrane; in addition, the high resistance of stainless steel itself and the additional resistance generated by the corrosion products reduce the conductivity, which directly affects the output power and service life of the battery.
The use of precious metals such as gold and silver can improve conductivity and corrosion resistance, but it will greatly increase the manufacturing cost and is not conducive to commercial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] After cleaning and drying the stainless steel bipolar plate, put it into the vacuum chamber of the arc ion plating equipment, install pure chromium targets on all cathode arc source positions, and vacuumize to 5×10 -3 Pa, pass argon gas to 0.8Pa, add 800V×20kHz×40% pulse bias voltage to trigger glow plasma to clean the bipolar plate by ion sputtering for 10 minutes, reduce the bias voltage amplitude to 500V, and change the partial pressure of argon gas At 0.4Pa, start the chromium cathode arc, set the arc flow at 80A, start to deposit pure chromium layer, the time is 5 minutes, then feed nitrogen, the flow rate is 100sccm, start to deposit chromium nitride layer, the duration is also 5 minutes, and then Then stop sending nitrogen gas, and then pass nitrogen gas after 5 minutes... Repeat this alternately. The total deposition and coating time is 40 minutes. bipolar plate. In this way, a modified film with a synthetic chromium / chromium nitride multilayer structure is dep...

Embodiment 2

[0015] Put the stainless steel bipolar plate into the vacuum chamber of the arc ion plating equipment after cleaning and drying, install pure chromium targets on half of the cathode arc source positions, and install chromium-nickel targets on the other half of the arc source positions opposite to each other, and vacuumize to 5×10 -3 Pa, pass argon gas to 0.8Pa, add 800V×20kHz×40% pulse bias voltage to trigger glow plasma to clean the bipolar plate by ion sputtering for 10 minutes, reduce the bias voltage amplitude to 500V, and change the partial pressure of argon gas 0.4Pa, start the chromium cathode arc and the chromium-nickel cathode arc, the arc current is set at 80A, start to deposit the pure chromium-nickel layer, the time is 5 minutes, then feed nitrogen, the flow rate is 100sccm, start to deposit the chromium-nickel nitride layer, The duration is also 5 minutes, then stop sending nitrogen gas, and then pass nitrogen gas after 5 minutes... This is repeated alternately, a...

Embodiment 3

[0017] Put the stainless steel bipolar plate into the vacuum chamber of the arc ion plating equipment after cleaning and drying, install pure chromium targets on half of the cathode arc source positions, and install graphite targets on the other half of the arc source positions opposite to each other. 5×10 -3 Pa, pass argon gas to 0.8Pa, add 800V×20kHz×40% pulse bias voltage to trigger glow plasma to clean the bipolar plate by ion sputtering for 10 minutes, reduce the bias voltage amplitude to 500V, and change the partial pressure of argon gas 0.4Pa, start the chromium cathode arc and the graphite cathode arc, the arc current is set at 80A, and the time is 40 minutes. In this way, a diamond-like carbon (DLC) modified film doped with metal chromium is deposited on the surface of the bipolar plate, and the contact resistance of the film is ≤20mΩ·cm 2 (under 0.8MPa), simulated corrosion current i in PEMFC corrosion environment cor ≤1.0×10 -8 A / dm 2 , water contact angle ≥ 90°...

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Abstract

This invention discloses an ion-plating method for modification of stainless steel bipolar plate of proton exchange membrane fuel cell. The method comprises: pretreating a stainless steel bipolar plate by cleaning and drying, placing in the vacuum chamber of an arc ion-plating apparatus, vacuumizing, ion-sputtering to clean, depositing a thin film, and performing post treatment. The thin film deposition process comprises: starting cathode arc, regulating arc current, applying bias, introducing reactive gas, and depositing modification thin film on the surface of the bipolar plate. The stainless steel bipolar plate modified by the method has such advantages as high abrasion resistance, high electric conductivity, high strength and high hydrophobicity, and can satisfy the long-term running requirement in proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal materials, and is related to the preparation technology of proton exchange membrane fuel cell bipolar plates in the technical field of new energy. Background technique [0002] The bipolar plate plays the role of supporting, collecting and separating the oxidizing agent and reducing agent in the proton exchange membrane fuel cell (PEMFC), and guides the flow of oxidizing agent and reducing agent on the electrode surface of the battery, which is the most critical component that determines the cost performance of the fuel cell one. An ideal bipolar plate should have the characteristics of high electrical conductivity, corrosion resistance, high mechanical strength, high gas barrier capacity, low cost and easy processing. Metal is the material of choice for bipolar plates. Due to its good electrical and thermal conductivity, good machinability and high strength, stainless stee...

Claims

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Application Information

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IPC IPC(8): C23C16/34C23C16/50H01M4/88H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 林国强吴博郭媛媛
Owner DALIAN UNIV OF TECH
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