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Proton exchange membrane fuel cell stainless steel bipolar plate and method for preparing same

A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of difficult precise control of implanted ion concentration and depth, unfavorable mass production, and many processes, etc., to achieve Improved corrosion resistance, easy control of coating composition and depth, and simple process

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, ion plating has high requirements on equipment, and special arc ion plating equipment is required. There are many and complicated processes, high energy required, high modification cost, and it is difficult to accurately control the concentration and depth of implanted ions, which is not conducive to mass production.

Method used

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  • Proton exchange membrane fuel cell stainless steel bipolar plate and method for preparing same
  • Proton exchange membrane fuel cell stainless steel bipolar plate and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The base material of the bipolar plate is austenitic stainless steel, and its chemical composition is C≤0.03, Si≤1.00, Mn≤2.00, P≤0.035, S≤0.03, Ni: 12.0-15.0, Cr: 16.0-18.0, Mo: 2.0 -3.0, the remaining content is Fe;

[0029] The formed stainless steel substrate is subjected to pre-treatment processes such as surface cleaning, ultrasonic organic degreasing, and activation. Implant Cr and N ions on the ion implanter, and the vacuum chamber pressure is 2×10 -3 The implantation energies of pa, Cr ion and N ion are 200KeV and 50KeV respectively; the beam intensity is 1.5μAcm -2 , 20μAcm -2 ;Injection volume is 6×10 16 Ionscm -2 , 2×10 17 Ions / cm 2 ; Injection time is 1h. The injection temperature was 120°C. Take it out after cooling in the vacuum furnace for 2 hours.

[0030] Performance test: when the pressure is 150Ncm -2 When measured, the contact resistance is 23mΩcm 2 . A saturated calomel electrode was used as a reference electrode, a platinum electrode w...

Embodiment 2

[0032]The base material of the bipolar plate is martensitic stainless steel, and its chemical composition is C≤0.08, Si≤1.00, Mn≤1.00, P≤0.04, S≤0.030, Ni: 12.0-15.0, Cr: 11.0-13.50, and the remaining content is Fe;

[0033] The cleaned and shaped stainless steel substrate was implanted with Cr and N ions on an ion implanter, and the pressure in the vacuum chamber was 1×10 -2 The implantation energies of pa, Cr ion and N ion are 250KeV and 60KeV respectively; the beam intensity is 1.8μAcm -2 , 23μAcm -2 ;Injection volume is 3×10 17 Ions / cm -2 , 3×10 17 Ions / cm 2 ; Injection time is 2h. The injection temperature is 240°C. Take it out after cooling in the vacuum furnace for 2 hours.

[0034] Performance test: when the pressure is 150Ncm -2 When measured, the contact resistance is 25mΩcm 2 . A saturated calomel electrode was used as a reference electrode, a platinum electrode was used as a counter electrode, and the obtained bipolar plate was used as a working electrod...

Embodiment 3

[0036] The base material of the bipolar plate is austenitic stainless steel, and its chemical composition is C≤0.03, Si≤1.00, Mn≤2.00, P≤0.035, S≤0.03, Ni: 12.0-15.0, Cr: 16.0-18.0, Mo: 2.0 -3.0, the remaining content is Fe;

[0037] The formed stainless steel substrate is subjected to pre-treatment processes such as surface cleaning, ultrasonic organic degreasing, and activation. Implant Cr and N ions on the ion implanter, and the vacuum chamber pressure is 2×10 -3 The implantation energies of pa, Cr ion and N ion are 240KeV and 60KeV respectively; the beam intensity is 2μAcm -2 , 25μAcm -2 ;Injection volume is 3×10 17 Ionscm -2 , 3×10 16 Ions / cm 2； The injection time is 2h. The injection temperature was 200°C. Take it out after cooling in the vacuum furnace for 2 hours.

[0038] Performance test: when the pressure is 150Ncm -2 , the measured contact resistance is 20mΩcm 2 . A saturated calomel electrode was used as a reference electrode, a platinum electrode was ...

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Abstract

The invention relates to an improvement on a proton exchange membrane fuel cell stainless steel bipolar plate and a preparation method thereof. The invention is characterized in that: a CrxN plating layer is formed on the surface of a stainless steel bipolar plate by adopting ion injection, wherein x is between 0.06 and 10. The obtained bipolar plate has lower contact resistance and higher corrosion resistance; the contact resistance is only between 20 and 30 ohm cm2 under a condition of 150N / cm2 pressure; corrosion current is between 2 and 3 muA / cm2 under a simulation PEMFC corrosive environment; the corrosion resistance is higher than that of a pure metal plating layer and a nitride plating layer; and the properties are similar to those of electric arc ion nickel plating, chromium nitride and the like. The improvement adopts Cr ion and N ion injection, has the advantages of lower equipment requirement, simple process and low modification cost, is easy to control components and depth of the plating layer, can accurately control surface CrxN type and is suitable for commercial production of the bipolar plate. The injection temperature is only between 100 and 250 DEG C, so low energy consumption is required, high-temperature thermal treatment is saved, and influence on the size of a flow channel formed by stamping stainless steel plates is less.

Description

technical field [0001] The invention is an improvement to the stainless steel bipolar plate and the preparation method of the proton exchange membrane fuel cell, and particularly relates to a simple, low-cost modification and a modification method whose performance can reach noble metal modification. 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 resistance g...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/02H01M8/0202H01M8/0223
CPCY02E60/50Y02P70/50
Inventor 刘常福张振忠赵芳霞孙佰文姚振虎
Owner 江苏新源动力有限公司
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