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Preparation method of fuel cell metal pole plate coating

A metal plate and fuel cell technology, applied in fuel cells, metal material coating process, coating, etc., can solve the problem of reducing the corrosion resistance of fuel cell metal bipolar plates, shortening the service life of fuel cells, and reducing the combination of membrane bases To achieve the effect of improving the bonding force of the film base, increasing the bonding strength of the film base, and reducing the shedding of the film layer

Inactive Publication Date: 2021-08-03
NANJING VOCATIONAL UNIV OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for improving the bonding force of the film base include cleaning and activating the surface of the substrate, optimizing the coating process parameters, reasonably matching the film layer and the substrate material, and setting a transition layer with a gradual change in composition or structure between the substrate and the film layer, etc. Although the above method has effectively improved the membrane-base bonding strength to a certain extent, the membrane-base bonding strength still cannot meet the market-oriented requirements for the high durability of the fuel cell metal bipolar plate coating, and, due to the inherent Limitations, there will still be unavoidable defects such as pinholes in the film layer. In the fuel cell environment, long-term operation will cause pitting corrosion of the coating, which will reduce the bonding force of the film base, and eventually cause the coating to fall off and fail, reducing fuel cell performance. Corrosion resistance of metal bipolar plates, shortening fuel cell lifetime

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  • Preparation method of fuel cell metal pole plate coating
  • Preparation method of fuel cell metal pole plate coating
  • Preparation method of fuel cell metal pole plate coating

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preparation example Construction

[0047] Such as Figure 3-6 Shown, a kind of fuel cell metal plate coating preparation method of the present invention comprises the following steps:

[0048] Step 1. Surface pretreatment

[0049] Clean and dry the surface of the substrate 1, remove the fine dust and other inorganic attachments and oxides on the surface of the substrate 1, and use ethanol, acetone, ultrasonic cleaning, pickling, alkali cleaning, etc. to prevent defects in subsequent processing.

[0050] Step 2, surface fine structure processing

[0051] Micro-structure processing on the surface of the substrate 1 is carried out by means of micro-embossing, micro-rolling or laser processing, and chemical corrosion. Uniform distribution or non-uniform distribution, the fine structure is micro-nano scale in the direction perpendicular to the substrate surface, and micro-scale in the direction parallel to the substrate surface. Among them, the micro-imprinting is to form a microstructure on the surface of the su...

Embodiment 1

[0073] Coating structure such as figure 1 As shown in (a), the substrate 1 is a 316 stainless steel substrate with a thickness of 0.1 mm, the material of the coating 1 and 2 is amorphous carbon, and the thickness of the coating is 5 um.

[0074] First, the surface of the 316 stainless steel substrate is cleaned and dried with acetone ultrasonic wave, and then the surface of the 316 stainless steel substrate is processed with a micro-pit structure array by micro-imprinting, micro-rolling or laser processing, chemical corrosion and other methods. Before coating, the 316 stainless steel substrate with surface fine structure was ultrasonically treated with acetone and dried.

[0075] Then, the closed-field unbalanced magnetron sputtering equipment is used for coating. The coating equipment is equipped with 2 DC power supplies and 2 graphite targets are installed. Put the 316 stainless steel substrate sample into the vacuum chamber of the coating machine, and evacuate to 2.5×10 －...

Embodiment 2

[0079] Coating structure such as figure 1 As shown in (b), the substrate 1 is a 316 stainless steel substrate with a thickness of 0.1mm, the material of the coating layer 1 and 2 is amorphous carbon, and the thickness of the coating layer is 5um.

[0080] First, the surface of the 316 stainless steel substrate is cleaned and dried with acetone ultrasonic wave, and then the surface of the 316 stainless steel substrate is processed with a micro-pit structure array by micro-imprinting, micro-rolling or laser processing, chemical corrosion and other methods. Before coating, the 316 stainless steel substrate with surface fine structure was ultrasonically treated with acetone and dried.

[0081] Then, the closed-field unbalanced magnetron sputtering equipment is used for coating. The coating equipment is equipped with 2 DC power supplies and 2 graphite targets are installed. Put the 316 stainless steel substrate sample into the vacuum chamber of the coating machine, and evacuate to...

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Abstract

The invention discloses a preparation method of a fuel cell metal pole plate coating, and relates to the technical field of fuel cell manufacturing, and preparation method comprises the steps of surface pretreatment, surface fine structure processing, surface retreatment, film plating, polar plate forming and the like. On the premise of not changing the coating structure and components of the metal bipolar plate of the fuel cell, after a fine structure is processed on the surface of a base material, sputter coating and mask sputter coating are carried out, so that layer-by-layer mosaic structures are formed between plating layers and the base material and between the plating layers, the film-substrate binding force and the binding force between the plating layers can be effectively improved, the film-substrate binding strength can be improved, and the use durability of the plating layers is further improved; the falling of a film layer in use can be effectively reduced, the corrosion resistance of the metal bipolar plate is enhanced, and the requirements of high performance and long-time use of the metal bipolar plate of the fuel cell are met.

Description

technical field [0001] The invention relates to the technical field of fuel cell manufacturing, in particular to a method for preparing a fuel cell metal pole plate coating. Background technique [0002] Hydrogen energy is internationally recognized as a new type of energy with good prospects. It has the advantages of cleanness, high efficiency and renewable, and is expected to become one of the main alternative energy sources in this century. Among them, the hydrogen-oxygen proton exchange membrane fuel cell can directly convert the chemical energy in hydrogen into electrical energy without burning, and its energy conversion efficiency is not limited by the Carnot cycle, and the power generation efficiency of the battery pack can reach more than 50%. For water, very friendly to the environment. Hydrogen-oxygen proton exchange membrane fuel cells have the advantages of high energy density, low operating temperature, fast startup speed, and long working life. They are ideal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0228H01M8/0258C23C14/34C23C14/02C23C14/32C23C14/35C23C14/04C23C14/58
CPCC23C14/0036C23C14/021C23C14/028C23C14/042C23C14/325C23C14/34C23C14/35C23C14/5886H01M8/0228H01M8/0258Y02E60/50Y02P70/50
Inventor 高照阳张辉周滔温玉锋
Owner NANJING VOCATIONAL UNIV OF IND TECH