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Fuel cell metal bipolar plate carbon chromium gradient coating and preparation method

A metal bipolar plate, fuel cell technology, applied in battery electrodes, metal material coating process, coating and other directions, can solve problems such as corrosion current and contact resistance reduction, reduce contact resistance, improve corrosion resistance, improve Effect of battery output performance

Active Publication Date: 2012-11-28
SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion current and contact resistance of the above methods need to be further reduced, and the hydrophobicity and membrane-base binding force need to be further improved.

Method used

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  • Fuel cell metal bipolar plate carbon chromium gradient coating and preparation method
  • Fuel cell metal bipolar plate carbon chromium gradient coating and preparation method
  • Fuel cell metal bipolar plate carbon chromium gradient coating and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment is implemented under the following conditions of implementation and technical requirements:

[0030] UDP850 unbalanced magnetron sputtering ion plating coating equipment is used to prepare carbon-chromium step coating. The equipment is equipped with 4 magnetron targets evenly distributed on the side wall of the coating chamber, and two chromium targets and two carbon targets are arranged opposite to each other. Put the 304 stainless steel and 316 stainless steel samples into the vacuum chamber after cleaning and drying, and install them on the rotating sample holder. Vacuum to 3.0×10 -5 torr, enter argon gas, apply bias to -300V, perform ion cleaning on the surface of the sample to remove the passivation film on the stainless steel surface; then adjust the substrate bias to -80V, chromium target current 4A, deposit Cr bottom layer for 5min; For the transition layer, turn on the carbon target, the current gradually increases to 4A, the chromium target cu...

Embodiment 2

[0032]UDP850 unbalanced magnetron sputtering ion plating coating equipment is used to prepare carbon-chromium step coating. The equipment is equipped with 4 magnetron targets evenly distributed on the side wall of the coating chamber, and two chromium targets and two carbon targets are arranged opposite to each other. Put the 304 stainless steel and 316 stainless steel samples into the vacuum chamber after cleaning and drying, and install them on the rotating sample holder. Vacuum to 3.0×10 -5 torr, enter argon gas, apply bias voltage to -500V, perform ion cleaning on the surface of the sample to remove the passivation film on the stainless steel surface; then adjust the substrate bias voltage to -60V, chromium target current 6A, deposit Cr bottom layer for 10min; redeposition For the transition layer, turn on the carbon target, the current gradually increases to 6A, the chromium target current gradually decreases to 1A, and the time is 45 minutes; then keep the carbon target ...

Embodiment 3

[0034] UDP850 unbalanced magnetron sputtering ion plating coating equipment is used to prepare carbon-chromium step coating. The equipment is equipped with 4 magnetron targets evenly distributed on the side wall of the coating chamber, and two chromium targets and two carbon targets are arranged opposite to each other. Put the 304 stainless steel and 316 stainless steel samples into the vacuum chamber after cleaning and drying, and install them on the rotating sample holder. Vacuum to 3.0×10 -5 torr, enter argon gas, apply bias voltage to -700V, perform ion cleaning on the surface of the sample to remove the passivation film on the stainless steel surface; then adjust the substrate bias voltage to -70V, chromium target current 8A, deposit Cr bottom layer for 15min; redeposition For the transition layer, turn on the carbon target, the current gradually increases to 8A, the chromium target current gradually decreases to 1A, and the time is 60 minutes; then keep the carbon target...

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Abstract

The invention relates to a fuel cell metal bipolar plate carbon chromium gradient coating and a preparation method, which is characterized in that a closed field unbalanced magnetron sputtering technology is used for depositing the chromium and carbon elements with different proportions on the surface of a stainless steel thin plate to form the carbon chromium gradient coating. The preparation method comprises the following steps: 1) cleaning ion sputtering; 2) depositing a pure chromium base layer; 3) depositing a chromium and carbon transition layer; 4) depositing a chromium and carbon coexistence layer; and 5) depositing a pure carbon work layer. Compared with the prior art, the modified bipolar plate has high membrane-based combination force, corrosion resisting performance and conductive performance, and can satisfy the usage requirement of the fuel cell bipolar plate.

Description

technical field [0001] The invention relates to a preparation method in the technical field of fuel cells, in particular to a corrosion-resistant conductive coating of a metal bipolar plate for a fuel cell and a preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) can directly convert the chemical energy in hydrogen into electrical energy without combustion, and its energy conversion efficiency is not limited by the Carnot cycle, and the power generation efficiency of the battery pack can reach 50 More than %, the only product is water, which is very friendly to the environment. PEMFC has low operating temperature, fast start-up speed, and long working life. It is an ideal mobile power supply and independent power supply device. It has broad application prospects in the fields of transportation, electronic products, national defense and military, and fixed power stations. [0003] The bipolar plate is one of the key components...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88C23C14/06C23C14/35
CPCY02E60/50
Inventor 周滔易培云吴昊彭林法来新民
Owner SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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