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Corrosion-resistant film layer for bipolar plate of fuel cell and preparation method of corrosion-resistant film layer

A fuel cell and bipolar plate technology, applied in fuel cell parts, metal material coating process, coating and other directions, can solve the problem of poor bonding force between the graphite layer and the metal bipolar plate, the cost of fuel cells is difficult to reduce, and it is difficult to Realize problems such as mass production, and achieve the effects of short preparation time, enhanced bonding force, and improved durability.

Inactive Publication Date: 2021-06-25
TRITREE METAL SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current bipolar plates are mainly divided into graphite plates and metal plates according to the material. Graphite bipolar plates have good electrical conductivity, corrosion resistance, and good thermal conductivity. However, graphite plates are relatively brittle and difficult to process. It is difficult to achieve large Mass production; metal bipolar plates are easy to form and low in cost, but have poor corrosion resistance. Usually, the surface of the metal bipolar plate needs to be processed to form a corrosion-resistant film with good conductivity on the surface of the metal bipolar plate
[0005] In view of the related technologies mentioned above, the inventor believes that the film materials that can meet the electrical conductivity and corrosion resistance requirements of the metal bipolar plate are mostly precious metals or rare metals, such as: Au, Ag, Pt, etc., so that the cost of the fuel cell It is always difficult to drop; and the bonding force between the graphite layer and the metal bipolar plate is poor, the compactness of the film layer is poor, and it is difficult to meet the requirements of corrosion resistance. Therefore, a low-cost and corrosion-resistant metal bipolar plate is proposed. The film layer with conductivity requirements is extremely important

Method used

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  • Corrosion-resistant film layer for bipolar plate of fuel cell and preparation method of corrosion-resistant film layer
  • Corrosion-resistant film layer for bipolar plate of fuel cell and preparation method of corrosion-resistant film layer
  • Corrosion-resistant film layer for bipolar plate of fuel cell and preparation method of corrosion-resistant film layer

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Embodiment 1

[0049] refer to figure 1 , this embodiment discloses a corrosion-resistant film layer for a fuel cell bipolar plate, including a Ti layer 2, a TiC layer 3, and a C layer 4 that are sequentially covered on the surface of a fuel cell bipolar plate 1, and the C layer 4 is a graphite C layer 4.

[0050] This embodiment also discloses a method for preparing a corrosion-resistant film for a fuel cell bipolar plate, comprising the following steps:

[0051] Step 1, ultrasonically clean the fuel cell bipolar plate to be coated with corrosion-resistant film, then place the cleaned fuel cell bipolar plate in a vacuum coating chamber and heat it to 230°C, vacuumize, and keep the temperature in the vacuum coating chamber The temperature is 230°C.

[0052] Step 2, wait for the background vacuum in the vacuum coating chamber to reach 5×10 -3 At Pa, argon gas was introduced, and the intake volume of argon gas was controlled to be 1400 sccm, the bias voltage was set to -1200 V, and the surf...

Embodiment 2

[0057] The difference with embodiment 1 only lies in:

[0058] In step 3, adjust the flow rate of argon gas to make the air pressure reach 0.28Pa, set the bias voltage to -120V, turn on the intermediate frequency coating power supply of the Ti target, and set the current of the Ti target close to the side wall of the vacuum coating chamber to 45A , set the current of the Ti target near the center of the vacuum coating chamber to 30A, deposit the Ti layer for 20min, and turn off the Ti target.

Embodiment 3

[0060] The difference with embodiment 1 only lies in:

[0061] In step 4, adjust the argon gas flow rate to make the air pressure reach 0.3Pa, set the bias voltage to -120V, turn on the intermediate frequency coating power supply of the Ti target and the C target at the same time, and set the Ti target close to the side wall of the vacuum coating chamber Set the current of the Ti target near the center of the vacuum coating chamber to 45A, set the current of the Ti target near the center of the vacuum coating chamber to 30A, set the current of the C target near the side wall of the vacuum coating chamber to 25A, and set the current of the C target near the center of the vacuum coating chamber For 14A, deposit the TiC layer for 8 minutes, and close the Ti target and C target at the same time.

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Abstract

The invention relates to the field of vacuum coating, and particularly discloses a corrosion-resistant film layer for a bipolar plate of a fuel cell and a preparation method of the corrosion-resistant film layer. The corrosion-resistant film layer for the bipolar plate of the fuel cell comprises a Ti layer, a TiC layer and a C layer which sequentially cover the surface of the bipolar plate of the fuel cell. The preparation method of the corrosion-resistant film layer comprises the following steps: step 1, cleaning the bipolar plate of the fuel cell, and placing the bipolar plate in a vacuum coating chamber for heating and vacuumizing; step 2, glow cleaning in the vacuum coating chamber; step 3, depositing a Ti layer; step 4, depositing a TiC layer; and step 5, depositing a C layer. The bipolar plate of the fuel cell is prepared by the preparation method. The product can be used in the fuel cell and has the advantage of low cost; and in addition, the preparation method has the advantages of easiness in batch production, short time and low cost.

Description

technical field [0001] The application relates to the field of vacuum coating, more specifically, it relates to a corrosion-resistant film layer for a bipolar plate of a fuel cell and a preparation method thereof. Background technique [0002] A hydrogen fuel cell is an energy conversion device that converts chemical energy in fuel and oxidant into electrical energy by electrochemical reaction. Compared with other large-scale energy storage methods, hydrogen energy has the advantages of high energy density, no pollution in production, storage, and utilization, and low operation and maintenance costs. It is an ideal green large-scale energy storage technology. Therefore, fuel cells, as a clean and efficient power generation technology, have attracted extensive attention from enterprises and scientific researchers in recent years. [0003] However, the key factor restricting the industrialization of fuel cells is high cost, and the fuel cell stack accounts for the highest cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/06C23C14/16H01M8/0202
CPCC23C14/0036C23C14/0605C23C14/0635C23C14/165C23C14/345C23C14/3485C23C14/352H01M8/0202Y02E60/50Y02P70/50
Inventor 赵明华汪达文汪经纬贺健武俊伟
Owner TRITREE METAL SHENZHEN