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Double polar plates for fuel battery and method for making surface azote chromium thin film

A fuel cell and film preparation technology, which is applied to fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of high material cost, power reduction, complex process, etc., and achieve the effect of improving corrosion resistance

Inactive Publication Date: 2008-09-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Oak Ridge National Laboratory in the United States found that nickel-chromium alloys have better performance through the selection of substrate materials, and then performed high-temperature nitriding treatment on nickel-chromium alloys, which showed good electrical conductivity and corrosion resistance in the PEMFC environment, but there are still materials Problems such as high cost, complex process, and excessive energy consumption
[0006] Replacing scarce metals and their alloys with stainless steel as bipolar plates has the advantage of low cost, but there is a passivation film on the surface of stainless steel, which plays a positive role in improving corrosion resistance, but greatly increases the corrosion resistance of bipolar plates. Contact resistance, so that the battery heats up during operation, power is reduced and corrosion is accelerated, so if stainless steel is used as a bipolar plate, it must be surface modified

Method used

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  • Double polar plates for fuel battery and method for making surface azote chromium thin film

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Experimental program
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Effect test

Embodiment 1

[0028] Put the stainless steel thin plate bipolar plate into the vacuum chamber of the arc ion plating equipment after pretreatment such as cleaning and drying, install pure chromium targets on all cathode arc source positions, and vacuumize to 5×10 -3Pa, pass argon gas to 0.4Pa, start the chromium target arc to obtain arc plasma, the arc current is 50A, add 800V×20kHz×60% pulse bias, use the ions in the plasma to remove the bipolar plate by ion sputtering Treat the passivation film for 10 minutes, reduce the bias voltage amplitude to -300V, adjust the arc flow of the chromium cathode to 80A, start to deposit the pure chromium layer for 5 minutes, and then pass nitrogen gas with a flow rate of 100sccm, and start to deposit the nitrogen-chromium layer. The time is 35 minutes. After the time is up, the post-processing of unloading the bias voltage, stopping the arc, stopping the gas, and keeping the vacuum furnace cold for 1 hour is performed. Finally, the vacuum is released to t...

Embodiment 2

[0030] Put the stainless steel thin plate bipolar plate into the vacuum chamber of the arc ion plating equipment after cleaning and drying. -3 Pa, pass argon gas to 0.8Pa, add 800V×20kHz×40% pulse bias to trigger glow plasma of inert gas argon, and use ion in the plasma to perform ion sputtering on bipolar plate to remove passivation film treatment 10 Minutes, reduce the bias voltage amplitude to -300V, change the partial pressure of argon to 0.4Pa, start the chromium cathode arc, set the arc flow at 80A, start to deposit pure chromium layer, the time is 5 minutes, and then pass nitrogen gas, the flow rate is 100sccm , start to deposit the nitrogen-chromium layer, and the duration is also 5 minutes, then stop sending nitrogen gas, and then pass nitrogen gas after 5 minutes...This process is repeated alternately, the total deposition and coating time is 40 minutes, and then the bias voltage is unloaded and the arc is stopped. , Stop the gas, keep the vacuum furnace cold for 1 h...

Embodiment 3

[0032] Put the stainless steel thin plate bipolar plate into the vacuum chamber of the arc ion plating equipment after cleaning and drying. -3 Pa, pass argon gas to 0.8Pa, add 800V×20kHz×40% pulse bias to trigger glow plasma of inert gas argon, and use ion in the plasma to perform ion sputtering on bipolar plate to remove passivation film treatment 10 Minutes, reduce the bias voltage amplitude to -300V, change the partial pressure of argon to 0.4Pa, start the chromium cathode arc, set the arc flow at 80A, start to deposit pure chromium layer, the time is 5 minutes, and then pass nitrogen gas, the flow rate is 100sccm , and then adjust the chromium arc flow again. The adjustment method is carried out in a way that changes continuously with time. Within 35 minutes, the arc flow is uniformly and continuously adjusted from 80A to 120A. After that time, unload the bias voltage, stop the arc, stop the gas, and maintain the vacuum The furnace is cooled for 1 hour for post-processing,...

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Abstract

The invention provides a bipolar plate for fuel cell and a surface nitric-chrome film preparation method which belong to fuel cell technique field. The bipolar plate is composed of a stainless steel thin plate substrate and its two sides nitric-chrome film; the nitric-chrome film thickness is micro-nanometer magnitude and is prepared by using electric arc ion filming method, therein, substrate passive film is removed by using ion sputtering method before filming, used ion comes from glow plasma of inert gases or electric arc plasma vaporized from metal target; a simple substance film with even component, a grads film with component changed continuously from inside to outside, or a multi-layer film with component changed alternately can be obtained by controlling filming parameter in film depositing process. The substrate provided by the invention is the stainless steel thin plate, and has a nitric-chrome film on surface. The stainless steel thin plate and intric-chrome film match connects in atom dimension because of ion film depositing, thereby, the bipolar plate has characteristics of low-cost besides complex characteristics, for example, corrosion resistance, electrical conduction, strengthen and hydrophobic etc. The bipolar plate and preparation method are mainly suitable for fuel cell manufacturing field.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a bipolar plate for a proton exchange membrane fuel cell and its preparation technology. Background technique [0002] The fuel cell (Fuel Cell) can directly convert the chemical energy stored in the fuel and oxidant into electrical energy. It has high conversion efficiency, environmental friendliness, and high reliability. It is considered to be the preferred efficient and sustainable power generation technology in the 21st century. Among all kinds of fuel cells, Proton Exchange Membrane Fuel Cell (PEMFC) has the advantages of fast startup, long life and high specific power. All kinds of portable power sources are one of the ideal power sources for electric vehicles, other vehicles and even weapons. Therefore, the development of proton exchange membrane fuel cells plays a decisive role in the development of the entire new energy technology field. [0003] The bipolar plate is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/02C23C16/34C23C16/50H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 林国强吴博郭媛媛
Owner DALIAN UNIV OF TECH
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