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Manufacturing method of Fe-Ni-Cr alloy fuel cell bi-polar plate

A fe-ni-cr, 1.fe-ni-cr technology is applied in the field of making Fe-Ni-Cr alloy fuel cell bipolar plates, which can solve the problem that the iron-based surface cannot fully meet the requirements of fuel cell operation, and the coating The problems of immature layer technology and unfavorable processing can achieve the effect of reducing corrosion current density and surface contact resistance, enhancing surface conductivity and corrosion resistance, and improving conductivity and corrosion resistance.

Inactive Publication Date: 2010-10-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dalian Institute of Chemical Physics has also explored the deposition of carbon film on the surface of the iron base. Although the corrosion resistance has been improved to a certain extent, the carbon film is easy to fall off during the long-term operation of the battery.
(3) Preparation of multilayer film: Li Moucheng of Shanghai University and others invented a patent for preparing a three-layer film on the iron-based surface for surface modification. The inner and outer layers are SnO 2 , IrO 2 , the middle layer is Cr or Mo, and the coating thickness is 0.1-50μm, which has obtained a satisfactory corrosion resistance effect, but it is also expensive
[0006] So far, the coating technology on various substrates is immature, especially in terms of cost reduction, and coatings on iron-based surfaces cannot fully meet the requirements for fuel cell operation
This is mainly due to the fact that the prepared coatings are all deposited by means of PVD or CVD, and there are certain surface defects.
In addition, a certain amount of heating during the coating process is also unfavorable to subsequent processing. For example, whether the two-piece welded bipolar plate material is deformed or the weld seam cracks during the coating process, there are still problems

Method used

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  • Manufacturing method of Fe-Ni-Cr alloy fuel cell bi-polar plate
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  • Manufacturing method of Fe-Ni-Cr alloy fuel cell bi-polar plate

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Experimental program
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Embodiment 1

[0029] Such as figure 1 Shown, the manufacture method of Fe-Ni-Cr alloy fuel cell bipolar plate, it comprises the steps:

[0030] (1) Selection and smelting of alloy components: According to the ingredients of 38% Fe (atomic percentage), 33% Ni (atomic percentage), and 29% Cr (atomic percentage), Fe is obtained by vacuum induction melting 38 Ni 33 Cr 29 Alloy (vacuum induction melting is a conventional method);

[0031] (2) metal plate forming processing: the above alloy is processed into a metal plate with a flow field according to a conventional method;

[0032] (3) Surface chemical treatment: place the metal plate with a flow field in a HF solution with a volume concentration of 47%, soak it at 25°C for 8 minutes, take it out, wash it with water, dry it, and put it in H 2 SO 4 and HF mixed aqueous solution, H 2 SO 4The concentration of the substance is 0.5mol / L, the concentration of the substance of HF is 5ppm, with the metal plate as the working electrode, Pt as the...

Embodiment 2

[0038] Such as figure 1 Shown, the manufacture method of Fe-Ni-Cr alloy fuel cell bipolar plate, it comprises the steps:

[0039] (1) Selection and smelting of alloy components: According to the ingredients of 37% Fe (atomic percentage), 34% Ni (atomic percentage), and 29% Cr (atomic percentage), Fe is obtained by vacuum induction melting 37 Ni 34 Cr 29 alloy;

[0040] (2) metal plate forming processing: the above alloy is processed into a metal plate with a flow field according to a conventional method;

[0041] (3) Surface chemical treatment: place the metal plate with a flow field in an HF aqueous solution with a volume concentration of 45%, treat it at 30°C for (9) minutes, take it out, wash it with water, dry it, and put it in H 2 SO 4 and HF mixed aqueous solution, H 2 SO 4 The molar concentration of the substance is 0.52mol / L, the molar concentration of the HF substance is 4ppm, with the metal plate as the working electrode, Pt as the counter electrode, saturated...

Embodiment 3

[0044] Such as figure 1 Shown, the manufacture method of Fe-Ni-Cr alloy fuel cell bipolar plate, it comprises the steps:

[0045] (1) Selection and smelting of alloy components: according to the ingredients of 39% Fe (atomic percentage), 33% Ni (atomic percentage), and 28% Cr (atomic percentage), Fe is obtained by vacuum induction melting 39 Ni 33 Cr 28 alloy;

[0046] (2) metal plate forming processing: the above alloy is processed into a metal plate with a flow field according to a conventional method;

[0047] (3) Surface chemical treatment: place the metal plate in a 50% HF aqueous solution, treat it at 20°C for 7 minutes, take it out, wash it with water, dry it, and put it in H 2 SO 4 and HF mixed aqueous solution, H 2 SO 4 The amount concentration of the substance is 0.48mol / L, and the concentration of the substance of HF is 6ppm, with the metal plate as the working electrode, with Pt as the counter electrode, saturated calomel electrode (SCE) as the reference ele...

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Abstract

The invention belongs to the technical field of fuel cells, and relates to a manufacturing method of a Fe-Ni-Cr alloy fuel cell bi-polar plate. The method comprises the following steps of: mixing materials, wherein the materials comprise Fe with the content of x (atomic percentage), Ni with the content of y (atomic percentage) and Cr with the content of z (atomic percentage), x is equal to 37-39 percent, y is equal to 32-34 percent, z is equal to 28-30 percent, and the sum of x, y and z is 100 percent; smelting FexNiyCrz alloy by utilizing vacuum induction; molding and machining a metal plate; carrying out surface chemical treatment; placing the metal plate with a flow field in an HF water solution with the volume concentration of 45-50 percent under 20-30 DEG C and soaking for 7-9 min, taking out, cleaning and drying. The fuel cell bi-polar plate prepared by the method has the advantages of excellent corrosion resistance and conductivity, simple manufacturing process, low operation temperature, no easy deformation of the plate, suitability for assembly of a fuel cell pile and low cost.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a method for manufacturing a Fe-Ni-Cr alloy fuel cell bipolar plate. Background technique [0002] Proton membrane fuel cells have the characteristics of cleanness, high efficiency, mobility, and mild operating conditions, and have important application values ​​in the fields of transportation, aerospace, and electronic communications. A bipolar plate is a plate material that connects single cells in series. It needs to meet various performance requirements, including good electrical conductivity, excellent corrosion resistance (including acid corrosion, oxidative moisture corrosion, and electrode potential corrosion), good gas Tightness, sufficient mechanical strength, low density and relatively low cost. [0003] The currently used bipolar plate material is graphite, which is mainly based on graphite's good electrical conductivity, corrosion resistance, and oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 张东明郭路段良涛王再义
Owner WUHAN UNIV OF TECH
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