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Method for modifying surface of polar plate sealing groove by utilizing screen electrostatic powder spraying

An electrostatic powder and surface modification technology, which is applied in printing plate preparation, climate sustainability, final product manufacturing, etc., can solve problems such as ineffective sealing, and achieve improved upper limit of tolerance, good control performance and adaptability, electrical Effect of stack seal durability aid

Pending Publication Date: 2022-08-05
SHANGHAI SHENLI TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

However, this method can only prevent the coating from falling off, suppress the generation of penetrating pinholes, prevent the corrosive medium from penetrating into the metal substrate, and improve the corrosion resistance of the metal plate. solve the problem on

Method used

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  • Method for modifying surface of polar plate sealing groove by utilizing screen electrostatic powder spraying
  • Method for modifying surface of polar plate sealing groove by utilizing screen electrostatic powder spraying
  • Method for modifying surface of polar plate sealing groove by utilizing screen electrostatic powder spraying

Examples

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Embodiment

[0032] A process method for surface modification of the sealing groove of a fuel cell bipolar plate by electrostatic powder spraying of a screen printing plate, such as Figure 1-3 As shown, by making a 30-mesh non-conductive nylon wire mesh 2 consistent with the bipolar plate sealing groove pattern, a screen frame 1 with structural support strength, and a screen printing screen for the photosensitive adhesive layer 3 that shields the non-sealing groove area of ​​the bipolar plate The photosensitive adhesive layer 3 shields the area of ​​the bipolar plate 6 except for the sealing groove 7, and the electrostatic spray gun 4 is used to electrostatically spray powder The material 5 (epoxy resin powder) is sprayed on the surface of the sealing groove 7 of the bipolar plate 6 through the screen 2 of the screen printing screen, and then the sprayed bipolar plate 6 is put into a hot oven at 130 ° C for 30min to melt the electrostatic spray powder 5 The leveling curing forms a layer o...

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Abstract

The invention relates to a modification method of a bipolar plate sealing groove, in particular to a method for modifying the surface of the bipolar plate sealing groove by utilizing screen electrostatic powder spraying, which comprises the following steps: S1, attaching a silk screen to a bipolar plate to cover the area outside the bipolar plate sealing groove; s2, electrostatic spraying powder materials are sprayed to the surfaces of the sealing grooves through electrostatic spraying; and S3, leveling and curing the bipolar plate sprayed in the step S2 to obtain the surface-modified bipolar plate sealing groove. Compared with the prior art, the modified bipolar plate sealing groove disclosed by the invention can form a high polymer material coating which is compact and low in roughness, and has better bonding durability compared with a polar plate body material and most adhesives; and great help is provided for bipolar plate sealant type selection, sealing process simplification, repair economy, electric pile sealing durability and the like.

Description

technical field [0001] The invention relates to a method for modifying a sealing groove of a bipolar plate, in particular to a method for modifying the surface of a sealing groove of a polar plate by using screen electrostatic powder spraying. Background technique [0002] Fuel cell is a clean and efficient way of energy utilization. Usually, hydrogen is used as the best fuel to convert the chemical energy in hydrogen fuel and oxidant into electrical energy directly without going through the combustion process. It is of great significance to improve the environment and implement sustainable energy development. Fuel cells usually need to connect multiple single cells in series to form a stack. The main components are bipolar plates and membrane electrodes. The air tightness between the bipolar plates and the membrane electrodes directly determines the performance and life of the fuel cell stack. and safety and reliability. The traditional sealing method is that the elastomer...

Claims

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Application Information

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IPC IPC(8): B41C1/14
CPCB41C1/14Y02P70/50
Inventor 陈汇豪甘全全戴威
Owner SHANGHAI SHENLI TECH CO LTD
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