Proton exchange membrane fuel cell stainless steel bipolar plate and modification method thereof

A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of reduced volume specific power of assembled stacks, high modification costs, and high-performance modification, etc., to achieve The effect of price increase, low coating cost and enhanced corrosion resistance

Inactive Publication Date: 2010-05-19
江苏新源动力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in addition to the zinc dipping treatment, this method also needs to perform electroless nickel-phosphorus alloy plating in an alkaline and acidic dual-solution system to obtain the required coating. There are many preparation processes, resulting in high modification costs. In addition, the aluminum alloy is a substrate with a large thickness. , will cause the volume specific power of the assembled stack to decrease, and the nickel-phosphorus coating has a certain gap compared with the traditional precious metal plating effect
[0011] Although the various surface modifications of stainless steel or metal plates proposed above can overcome the deficiencies in contact resistance and corrosion resistance of pure metal plates to a certain extent, they still have their own shortcomings and cannot simultaneously achieve Low cost high performance modification

Method used

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  • Proton exchange membrane fuel cell stainless steel bipolar plate and modification method thereof
  • Proton exchange membrane fuel cell stainless steel bipolar plate and modification method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: The base material of the bipolar plate is 316L stainless steel.

[0034] Formed bipolar plate pretreatment: After the formed bipolar plate is chemically degreased for 10 minutes, it is washed with water. Carry out pickling for the second time, pickling for 8 minutes in the mixed acid whose volume fraction is 10% hydrochloric acid, 8% nitric acid and 82% distilled water for the first time, and wash with water. For the second time, activate in hydrochloric acid with a volume fraction of 20% for 30 seconds to remove the surface oxide layer, and wash with water.

[0035] Nickel electroplating: use electrolytic nickel plate as anode, use 120g / L nickel chloride heptahydrate, 8mL / L hydrochloric acid, 5mL / L surfactant to form nickel electroplating solution, temperature is 20℃, cathode current density is 1.2A / dm 2 Plating for 2 minutes, washed with water.

[0036] Electroless nickel-plating copper-phosphorus-nickel-copper-phosphorus composite plating solution consis...

Embodiment 2

[0038] Example 2: The base material of the bipolar plate is 304 stainless steel.

[0039] Formed bipolar plate pretreatment: chemical degreasing for 10 minutes, washing with water. Pickling in a mixed acid with a volume fraction of 10% hydrochloric acid, 8% nitric acid and 82% distilled water for 6 minutes, and washed with water. Active 30s pickling in hydrochloric acid with a volume fraction of 20%, followed by water washing.

[0040] Nickel electroplating: Electrolytic nickel plate is used as anode, 120g / L nickel chloride heptahydrate, 8mL / L hydrochloric acid, 5mL / L surfactant are used to form nickel electroplating solution, at a temperature of 20°C, the cathode current density is 1.2A / dm 2 Plating for 2 minutes. wash.

[0041] Electroless nickel-plating copper-phosphorus composite bath composition: 30g / L nickel sulfate heptahydrate, 0.8g / L copper sulfate pentahydrate, 25g / L sodium hypophosphite, 60g / L trisodium citrate, 30g / L sodium acetate, 10mL / L Surfactant Sodium Do...

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PUM

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Abstract

The invention relates to an improvement on a surface property of a proton exchange membrane fuel cell metal bipolar plate, which is characterized in that: a substrate surface is plated with a nickel layer and a Ni-Cu-P double-plating layer, wherein Ni-Cu-P adopts electroless deposition. The improvement not only greatly reduces contact resistance of the bipolar plate and a gas diffusion layer, but also improves corrosion resistant. Electrical conductivity and the corrosion resistance can basically reach the level of those of the stainless steel bipolar plate plated with precious metal. The improvement is simple in modification, low in cost and superior in performance after modification.

Description

technical field [0001] The invention improves the surface performance of metal bipolar plates of proton exchange membrane fuel cells, and in particular relates to a stainless steel bipolar plate with Ni-Cu-P coating on the surface obtained by an electroless plating method and a surface modification method. Background technique [0002] The bipolar plate is one of the key components of the proton exchange membrane fuel cell (PEMFC), and its cost accounts for more than 46% of the total cost of the fuel cell. The output power and service life of the battery stack. [0003] Stainless steel has the characteristics of high thermal conductivity, easy processing and low price, and can increase the output power of fuel cells, improve the thermal management of fuel cells, and reduce the cost of fuel cell stacks. It is a promising proton exchange membrane fuel cell bipolar board substrate. However, stainless steel not only has high resistance itself, but also has an additional resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/02C23C18/36C23C18/40H01M8/0297
CPCY02E60/50
Inventor 刘常福张振忠姚振虎孙佰文赵芳霞
Owner 江苏新源动力有限公司
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