In-situ preparation method of composite modified layer on surface of stainless steel bipolar plate of proton exchange membrane fuel cell

A technology of proton exchange membrane and fuel cell, which is applied in the direction of fuel cell, fuel cell parts, metal material coating technology, etc., can solve the problems affecting the service life of stainless steel bipolar plate materials, and achieve excellent membrane base bonding strength, Enhanced bonding strength and reduced differences in physical properties

Active Publication Date: 2020-06-02
UNIV OF SCI & TECH LIAONING
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Problems solved by technology

However, stainless steel is prone to pitting corrosion in the environment containing aggressive anions (such as Cl-), which seriously affects the service life of stainless steel bipolar plate materials

Method used

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  • In-situ preparation method of composite modified layer on surface of stainless steel bipolar plate of proton exchange membrane fuel cell
  • In-situ preparation method of composite modified layer on surface of stainless steel bipolar plate of proton exchange membrane fuel cell
  • In-situ preparation method of composite modified layer on surface of stainless steel bipolar plate of proton exchange membrane fuel cell

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preparation example Construction

[0041] A method for in-situ preparation of a composite modified layer on the surface of a stainless steel bipolar plate of a proton exchange membrane fuel cell, specifically comprising the following steps:

[0042] 1) Pre-processing of the workpiece:

[0043] Immerse the stainless steel bipolar plate in acetone and clean it with ultrasonic waves for 20 to 45 minutes, dry the surface with compressed air and place it in a drying oven. On the workpiece holder of the plasma-enhanced magnetron sputtering system;

[0044] 2) Vacuum and preheat:

[0045] Turn on the vacuum pumping system, when the pressure of the vacuum chamber is lower than 3×10 -3 At Pa, start the heating system, gradually increase the temperature, and gradually heat it to 300-400 ℃. At the same time, set the rotation speed of the workpiece holder to 30-100 r / min to remove the residual gas adsorbed on the vacuum wall until the vacuum degree drops to 3×10 again. -3 Below Pa;

[0046] 3) Degassing and filament preh...

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Abstract

The invention relates to an in-situ preparation method of a composite modified layer on the surface of a stainless steel bipolar plate of a proton exchange membrane fuel cell. The in-situ preparationmethod comprises the steps of pre-treating at an earlier stage, vacuumizing and preheating, conducting plasma cleaning, preparing a pure metal Cr layer by non-equilibrium magnetron sputtering, performing plasma in-situ nitriding treatment, cooling and then taking out. The prepared composite modified layer on the surface of the stainless steel bipolar plate is a nitriding / CrNx composite modified layer, the inner layer is a nitriding layer, and the surface layer is a CrNx layer. According to the invention, a plasma enhanced magnetron sputtering system is adopted, in-situ nitriding is carried outon a pure metal Cr layer and a base body at the same time, and nitrogen atoms are diffused into the base body from the Cr layer, so that the pure metal Cr layer and the base body are enabled to havecontinuous gradient distribution. Compared with a traditional nitriding-coating composite treatment process, the composite modified layer has more excellent electrical conductivity, wear resistance and film-substrate bonding strength, so that the service life of the bipolar plate is prolonged.

Description

technical field [0001] The invention relates to the technical field of surface modification treatment of metal materials, in particular to an in-situ preparation method of a composite modified layer on the surface of a stainless steel bipolar plate of a proton exchange membrane fuel cell. Background technique [0002] Stainless steel is an important metal structural material. Its main feature is good corrosion resistance, and it is widely used in ships, pipelines, chemical equipment, aerospace and other fields. Especially in the field of proton exchange membrane fuel cells, stainless steel has become the most potential bipolar plate material for commercialization due to its high strength, strong machinability, and gas impermeability. However, stainless steel containing aggressive anions (such as Cl - ) is prone to pitting corrosion, which seriously affects the service life of the stainless steel bipolar plate material. [0003] The non-equilibrium magnetron sputtering depo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0228H01M8/0206H01M8/021C23C8/38C23C14/02C23C14/16C23C14/35
CPCH01M8/0228H01M8/021H01M8/0206C23C14/35C23C14/165C23C14/022C23C8/38Y02E60/50Y02P70/50
Inventor 郭媛媛张泽陈军刘磊李露周艳文梁英爽李书鑫于来洋
Owner UNIV OF SCI & TECH LIAONING
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