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Metal bipolar plate high-electric-conductivity and corrosion-resistance protective coating layer and preparation method and application thereof

A metal bipolar plate, protective coating technology, applied in the direction of metal material coating process, coating, circuit, etc., can solve the problems of application limitation, poor corrosion resistance, poor corrosion resistance and electrical conductivity, etc., to improve the film The effect of base bond strength, excellent corrosion resistance and protection performance, and excellent electrical conductivity

Active Publication Date: 2020-01-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the amorphous carbon coating is sp 3 When the content is dominated, its corrosion resistance is excellent but its electrical conductivity is poor. When the coating is sp 2 When the structure is dominant, its electrical conductivity is excellent but its corrosion resistance is poor. Therefore, the comprehensive performance of amorphous carbon coatings in terms of electrical conductivity and corrosion resistance is still not ideal, which limits its application on the surface of metal bipolar plates.

Method used

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  • Metal bipolar plate high-electric-conductivity and corrosion-resistance protective coating layer and preparation method and application thereof
  • Metal bipolar plate high-electric-conductivity and corrosion-resistance protective coating layer and preparation method and application thereof
  • Metal bipolar plate high-electric-conductivity and corrosion-resistance protective coating layer and preparation method and application thereof

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preparation example Construction

[0025] One aspect of the embodiments of the present invention provides a method for preparing a highly conductive and corrosion-resistant protective coating of a metal bipolar plate, which is characterized in that it includes:

[0026] Provide metal bipolar plates;

[0027] Using a chromium target as a target material, using high-power pulsed magnetron sputtering technology to deposit a chromium transition layer on the surface of the metal bipolar plate;

[0028] And, using a graphite target as a target material, using DC magnetron sputtering technology to deposit an amorphous carbon layer on the surface of the chromium transition layer to obtain a metal bipolar plate highly conductive and corrosion-resistant protective coating;

[0029] Wherein, the process conditions adopted by the DC magnetron sputtering technology include: the central magnetic field intensity of the sputtering source is 40-60 mT, the fringe magnetic field intensity is 10-20 mT, and the power supply power is 0.8-1.0...

Embodiment 1

[0045] In this embodiment, the preparation method of the highly conductive and corrosion-resistant protective coating of the metal bipolar plate is as follows:

[0046] S1. The base material is made of 316L stainless steel, the stainless steel bipolar plate is ultrasonically cleaned, and it is dried and placed in the vacuum chamber, fixed on the workpiece holder, and vacuumed to 2.0×10 -5 Below Torr, then under the condition of argon flow rate of 100sccm and bias voltage of -450V, turn on the ion source, adjust the output voltage to 1200V, and use argon plasma to etch the surface of the stainless steel bipolar plate for 60min;

[0047] S2. Pour Ar gas into the cavity, maintain the cavity pressure at 1.7mTorr, turn on the high-power pulse power supply connected to the chromium sputtering target, set the power supply frequency to 500Hz, pulse width to 100μs, pulse voltage to 1000V, and power to 3KW, substrate bias voltage is -50V, chromium transition layer is deposited, thickness is 1...

Embodiment 2

[0050] In this embodiment, the preparation method of the highly conductive and corrosion-resistant protective coating of the metal bipolar plate is as follows:

[0051] S1. The base material is made of 316L stainless steel, the stainless steel bipolar plate is ultrasonically cleaned, and it is dried and placed in the vacuum chamber, fixed on the workpiece holder, and vacuumed to 2.0×10 -5 Below Torr, then under the condition of argon flow rate of 40sccm and bias voltage of -150V, turn on the ion source, adjust the output voltage to 1200V, and use argon plasma to etch the surface of the stainless steel bipolar plate for 30min;

[0052] S2. Pour Ar gas into the cavity, maintain the cavity pressure at 2mTorr, turn on the high-power pulse power supply connected to the chromium sputtering target, set the power supply frequency to 600Hz, pulse width to 100μs, pulse voltage to 800V, and power to 4KW , The substrate bias voltage is -80V, and the chromium transition layer is deposited with a...

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Abstract

The invention discloses a metal bipolar plate high-electric-conductivity and corrosion-resistance protective coating layer and a preparation method and application thereof. The preparation method of the metal bipolar plate high-electric-conductivity and corrosion-resistance protective coating layer comprises the following steps: with a chromium target as the target, a high-power pulse magnetron sputtering technology is adopted to deposit a chromium transition layer on the surface of a metal bipolar plate; with a graphite target as the target, a direct-current magnetron sputtering technology isadopted to deposit an amorphous carbon layer on the surface of the chromium transition layer to obtain the metal bipolar plate high-electric-conductivity and corrosion-resistance protective coating layer; and process conditions adopted by the direct-current magnetron sputtering technology comprises the sputtering source center magnetic field intensity of 40-60 mT, the edge magnetic field intensity of 10-20 mT and the power of 0.8-1.0 kW. The provided chromium transition layer is smooth in surface and compact in internal structure, and can effectively improve the film base bonding strength; and meanwhile, through optimization of an amorphous carbon layer preparation process, the amorphous carbon layer achieves excellent electric conductivity and corrosion resistance, and can permanently and effectively protect the metal bipolar plate.

Description

Technical field [0001] The invention belongs to the technical field of surface engineering protection, and specifically relates to a metal bipolar plate high-conductivity and corrosion-resistant protective coating, and a preparation method and application thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are a new type of energy that can directly convert hydrogen energy into electricity. Because of its fast start-up, relatively low operating temperature, rapid response to various environments, no pollution, and high energy efficiency, it has a good application prospect in new energy vehicles, fixed and portable power supplies. A battery cell of a proton exchange membrane fuel cell is usually composed of a bipolar plate (BPP), a membrane electrode (MEA), a gasket and an end plate. Among the many components, the bipolar plate occupies 80% of the total mass of the fuel cell, almost the entire volume, and about 18%-28% of the manufacturing cost. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/35C23C14/06C23C14/02H01M8/0228
CPCC23C14/165C23C14/352C23C14/0605C23C14/3485C23C14/022H01M8/0228Y02E60/50
Inventor 李昊汪爱英张栋柯培玲刘林林
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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