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

A fuel cell and bipolar plate technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of equipment with limited product size, difficult to guarantee the quality of the film layer, leakage of metal substrates, etc., to avoid contact with corrosive media, preparation The method is simple and efficient, and the effect of high conductivity

Active Publication Date: 2021-02-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these coating processes are often complicated, and the quality of the film layer is difficult to guarantee. In harsh environments, it is very likely that the metal substrate will leak out and cause the film layer to fail.
At the same time, these in-situ film-forming processes often make the product size limited by equipment, and the cost is high

Method used

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

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Embodiment 1

[0036] This embodiment provides a method for preparing a corrosion-resistant coating for a fuel cell bipolar plate, including:

[0037] 1) Pretreatment of the metal plate 1: cleaning the pure magnesium bipolar plate with ultrasonic vibration using acetone and absolute ethanol in sequence.

[0038] 2) Preparation of the conductive colloid layer 2: apply the conductive colloid layer 2 on the surface of the metal plate 1 with a scraper, and the coating thickness is 30 μm;

[0039] 3) Hydrophobic carbon fiber cloth layer: cut 40μm thick tantalum foil to 1cm 2 Attached to the surface of the conductive colloid layer 2 to form a tantalum foil layer 3 .

[0040] 4) Apply a pressure of 10-50N (20N in this embodiment) on the surface of the tantalum foil layer 3 to fully contact the conductive colloid layer 2 with the tantalum foil layer 3 .

[0041] 5) Put the metal pole plate 1 coated with anti-corrosion coating into a drying oven, set the temperature at 140-160°C (150°C in this embo...

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Abstract

The invention relates to a corrosion-resistant coating for a bipolar plate of a fuel cell and a preparation method of the corrosion-resistant coating. The corrosion-resistant coating comprises a conductive colloid layer coating the surface of a metal polar plate, and a tantalum foil layer arranged on the conductive colloid layer. Compared with the prior art, the tantalum foil is used for preventing the metal bipolar plate from being in contact with a corrosive medium in a battery environment, so the polar plate is effectively protected, and a corrosion speed in the battery environment can be reduced to 10<-8>-10<-7>A/cm<2>; and meanwhile, by utilizing the excellent conductivity of the conductive colloid and tantalum metal, the contact resistance is about 5-30 m omega cm<2> under 1.4 Mpa, and the performance of the bipolar plate of the fuel cell is ensured to be exerted. The preparation method is simple and efficient.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a corrosion-resistant coating for fuel cell bipolar plates and a preparation method thereof. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy through an electrochemical reaction. With the continuous development of new energy technologies, hydrogen-fueled proton exchange membrane fuel cells (Proton Exchange Membrane Fuel Cell, PEMFC) have attracted widespread attention in recent years, due to its high conversion efficiency, no pollution to the environment, low operating temperature, long working life Long and other characteristics, it has been widely used in the fields of national defense and transportation. [0003] The bipolar plate is one of the key components of the proton exchange membrane fuel cell, accounting for 80% of the cell stack volume, 70% of the mass and 30%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0228
CPCH01M8/0228Y02E60/50
Inventor 应韬闫鹏飞曾小勤李扬欣李德江王乐耘
Owner SHANGHAI JIAO TONG UNIV
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