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Chromium carbide modified iron-based metal bipolar plate and preparation method thereof

A metal bipolar plate and chromium carbide technology, which is applied in metal material coating technology, battery electrodes, electrochemical generators, etc., can solve the problems of high cost of noble metal coating, reduced service life of polymer electrolyte membrane fuel cells, and discomfort Focusing on low-cost production and other issues, to achieve low material and processing costs, realize mass industrial production and large-scale market applications, and achieve low cost effects

Active Publication Date: 2012-08-15
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Precious metal coatings are unsuitable for low-cost battery packs due to their high cost
Nitride and oxide coatings prepared by different methods such as physical vapor deposition, chemical vapor deposition and electroplating will generate unavoidable defects such as micropores and microcracks due to the limitation of the preparation process, which will peel off due to local corrosion, thus Causes a reduction in the service life of polymer electrolyte membrane fuel cells

Method used

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  • Chromium carbide modified iron-based metal bipolar plate and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] Plasma carburizing and thermal reaction deposition and diffusion composite surface modification technology are used to treat iron-based alloys (0.42-0.50% C, 0.17-0.37% Si, 0.35-0.80% Mn, Cr≤0.25%, Ni≤0.30%, Cu≤ 0.25%, P2 , the vacuum degree is 100Pa, the carburizing time is 2h, and the reaction gas is methane. The temperature of thermal reaction deposition and diffusion is 500℃, and the diffusion time is 0.5h, the generated Cr 7 C 3 The layer thickness is 1 μm. The interfacial contact resistance of the iron-based alloy metal bipolar plate after plasma carburizing and thermal reaction deposition and diffusion compound surface modification is significantly reduced, slightly higher than that of graphite, such as figure 1 shown. The current density is less than 10μA / cm under the working conditions of simulated polymer electrolyte membrane fuel cells 2 .

Embodiment 2

[0020] Plasma carburizing and thermal reaction deposition and diffusion compound surface modification technology are used to treat iron-based alloys (0.17~0.23%C, 0.17~0.37%Si, 0.35~0.80%Mn, Cr≤0.25%, Ni≤0.30%, Cu≤ 0.25%, P2 , the vacuum degree is 880Pa, the carburizing time is 5h, and the reaction gas is acetylene. The temperature of thermal reaction deposition and diffusion is 750℃, the diffusion time is 20h, the generated Cr 3 C 2 +Cr 7 C 3 The layer thickness was 20 μm. The interfacial contact resistance of the iron-based alloy metal bipolar plate after plasma carburizing and thermal reaction deposition and diffusion compound surface modification is significantly reduced, slightly higher than that of graphite, such as figure 1 shown. The current density is less than 10μA / cm under the working conditions of simulated polymer electrolyte membrane fuel cells 2 .

Embodiment 3

[0022] Plasma carburizing and thermal reaction deposition and diffusion composite surface modification technology are used to treat iron-based alloys (0.07-0.14% C, 0.17-0.37% Si, 0.35-0.80% Mn, Cr≤0.25%, Ni≤0.30%, Cu≤ 0.25%, P2 , the vacuum degree is 1330Pa, the carburizing time is 8h, and the reaction gas is propane. The temperature of thermal reaction deposition and diffusion is 1000℃, and the diffusion time is 45h. The generated Cr 3 C 2 +Cr 23 C 6 The layer thickness was 30 μm. The interfacial contact resistance of the iron-based alloy metal bipolar plate after plasma carburizing and thermal reaction deposition and diffusion compound surface modification is significantly reduced, slightly higher than that of graphite, such as figure 1 shown. The current density is less than 10μA / cm under the working conditions of simulated polymer electrolyte membrane fuel cells 2 .

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Abstract

The invention provides a chromium carbide modified iron-based metal bipolar plate for a fuel battery and a preparation method thereof. An iron-based alloy metal plate is subjected to surface modification by using plasma carburization and a combined thermal reactive deposition and diffusion surface modification process. The modified surface of the metal plate is a chromium carbide diffusion layer with high conductivity and corrosion resistance, the thickness is 1-30 microns, and the corrosion speed is lower than 10 microamperes / square centimeter. When the pressure is 150-200 N / square centimeter, the contact resistance is 10-20 micro-ohms*square centimeter, and a chromium carbide diffusion layer is made of Cr3C2 and / or Cr7C3 and / or Cr23C6. According to the method provided by the invention, the corrosion resistance of the metal bipolar plate can be obviously improved in a condition of ensuring the intensity of the bipolar plate and not influencing battery properties of the bipolar plate. The chromium carbide diffusion layer with the modified surface and a base body are in metallurgical combination. Furthermore, components of the chromium carbide diffusion layer can be controlled by adjusting isothermal diffusion temperature and time.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrodes. In particular, it relates to a metal bipolar plate of a polymer electrolyte membrane fuel cell and a preparation method thereof. Background technique [0002] In addition to the characteristics of high energy conversion efficiency, long life, and environmental friendliness, polymer electrolyte fuel cells have become a power source for transportation and construction of decentralized power stations due to their low operating temperature and fast start-up. power supply. However, factors such as high cost, weight, and volume largely hinder the large-scale commercial application of polymer electrolyte fuel cells. Therefore, cost reduction has become the focus of governments and researchers. [0003] As one of the important multifunctional components in polymer electrolyte fuel cells, the bipolar plate not only has the functions of separating the reactant gas, collecting electricity, s...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/02C22C38/04C23C12/00H01M8/021H01M8/0228
CPCY02E60/50
Inventor 田如锦
Owner DALIAN JIAOTONG UNIVERSITY
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