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Fuel cell metal bipolar plate with conductive and anti-corrosion plating and preparation method thereof

A metal bipolar plate, fuel cell technology, applied in fuel cells, fuel cell parts, metal material coating processes, etc. problem, to achieve the effect of reducing corrosion resistance, improving the bonding force of film base, and improving performance

Active Publication Date: 2013-02-13
苏州治臻新能源装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese Patent Publication No. CN101710621A uses ion implantation to form a corrosion-resistant CrN coating on the surface of the stainless steel bipolar plate. This method has low equipment requirements, simple process, and low modification cost, but the corrosion current is still relatively high.
However, the durability of the carbon-containing film layer prepared by the prior art needs to be improved due to the low bonding force of the film base.

Method used

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  • Fuel cell metal bipolar plate with conductive and anti-corrosion plating and preparation method thereof
  • Fuel cell metal bipolar plate with conductive and anti-corrosion plating and preparation method thereof
  • Fuel cell metal bipolar plate with conductive and anti-corrosion plating and preparation method thereof

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Embodiment 1

[0032] This embodiment is implemented under the following conditions of implementation and technical requirements:

[0033]UDP850 unbalanced magnetron sputtering ion plating coating equipment is used to prepare chromium-nitrogen-carbon ternary composite ladder coating. The equipment is equipped with 4 magnetron targets evenly distributed on the side wall of the coating chamber, two chromium targets and two carbon The targets are arranged opposite to each other. The 304 stainless steel sample was ultrasonically cleaned with weak base, weak acid, deionized water and absolute ethanol, then dried in an oven at 60°C and installed on the rotating sample holder in the furnace cavity. Vacuum to 3.0×10 -5 torr, flow Ar gas, apply bias voltage to -500V, and ion-clean the surface of the sample for 30 minutes to remove the passivation film on the surface of the stainless steel. Adjust substrate bias to -80V, chromium target current 3A, deposit Cr bottom layer for 5 minutes; then deposit...

Embodiment 2

[0036] The cleaning process of the first step in embodiment 2 is exactly the same as embodiment 1. The difference is that in the second step, the chromium target current is 10A, and the Cr bottom layer is deposited for 20 minutes; then the chromium nitride transition layer is deposited, nitrogen gas is introduced, the OEM value is 40%, the Cr target current is 10A, and the deposition time is 60 minutes; then the carbon target is turned on, and the current 10A, keep the OEM value and chromium target current unchanged, deposit chromium, nitrogen and carbon coexistence layer for 120min; finally deposit the working layer, stop filling nitrogen, turn off chromium target current and OEM system, carbon target current 10A, deposition time 600min. Tests show that the total thickness of the chromium-nitrogen-carbon ternary composite step coating prepared by this embodiment is 5.0 μm, and the binding force is 62N; Figure 4 As shown in the curve of Example 2, when the pressure is 1.5MPa,...

Embodiment 3

[0038] The cleaning process of the first step in embodiment 3 is exactly the same as that of embodiments 1 and 2. The difference is that in the second step, the chromium target current is 8A, and the Cr bottom layer is deposited for 15 minutes; then the chromium nitride transition layer is deposited, nitrogen gas is introduced, the OEM value is 50%, the Cr target current is 8A, and the deposition time is 45 minutes; then the carbon target is turned on, and the current 8A, keep the OEM value and chromium target current unchanged, deposit chromium, nitrogen and carbon coexistence layer for 45 minutes; finally deposit the working layer, stop filling nitrogen, turn off chromium target current and OEM system, carbon target current 4A, deposition time 60min. Tests show that the total thickness of the chromium-nitrogen-carbon ternary composite step coating prepared by this embodiment is 3.2 μm, and the binding force is 83.5N; Figure 4 The curve of Example 3 shown, when the pressure ...

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Abstract

The invention relates to a fuel cell metal bipolar plate with the conductive and anti-corrosion plating and a preparation method thereof. Chromium-nitrogen-carbon ternary composite step plating is formed on the surface of the metal bipolar plate by using a closed field unbalanced magnetron sputtering technology, and a pure chromium base layer, a chromium nitride transition layer, a chromium-carbon-nitrogen coexistence layer and an amorphous carbon layer are arranged upwards successively on the surface of the metal bipolar plate. Compared with the prior art, the fuel cell metal bipolar plate with the conductive and anti-corrosion plating and the preparation method thereof combine toughness of the chromium nitride, the corrosion resistance of the chromium carbide and the conductivity of amorphous carbon film fully, and the chromium nitride, the chromium carbide and the amorphous carbon film are composited through a step transition method. The modified metal bipolar plate film base binding force is improved apparently, the corrosion resistance and the conductivity are enhanced apparently, and high-performance and long-time use requirements of the fuel cell metal bipolar plate can be met.

Description

technical field [0001] The invention relates to a preparation method in the technical field of fuel cells, in particular to a chromium-nitrogen-carbon ternary composite gradient coating for metal bipolar plates of proton exchange membrane fuel cells and a preparation method thereof. Background technique [0002] The bipolar plate is one of the key components of the proton exchange membrane fuel cell, accounting for about 80% of the stack volume, 70% of the mass and 29% of the cost. Its main function is to support the membrane electrode assembly, distribute reaction gas, collect current, conduct heat and discharge product water, etc. Bipolar plates made of thin metal sheets (such as stainless steel 304, 316, etc.) have good electrical conductivity and strong resistance to vibration failure. They are suitable for mass production methods such as stamping and forming, and are the main development direction of proton exchange membrane fuel cells. However, the metal bipolar plate...

Claims

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Application Information

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IPC IPC(8): H01M8/02C23C14/35C23C14/06H01M8/0228
CPCY02E60/50Y02P70/50
Inventor 周滔易培云彭林法吴昊来新民
Owner 苏州治臻新能源装备有限公司
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