Fuel cell metal pole plate multiphase coating for suppressing columnar crystals and preparation method thereof

A metal plate and fuel cell technology, which is applied to fuel cell components, battery electrodes, circuits, etc., can solve the problems of low bonding ability between the coating and the substrate, large internal stress, etc., and achieve excellent substrate bonding performance and prolong Life expectancy, effect of growth improvement

Active Publication Date: 2019-07-12
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently disclosed technologies still have a lot of room for improvement in terms of corrosion resistance and contact resistance of metal plates.
At the same time, there is a large internal stress in the coating prepared by the prior art, the bottom coating can form columnar crystals, the coating has a small bonding ability with the substrate, and the outermost coating is not dense enough to cause corrosion such as pitting

Method used

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  • Fuel cell metal pole plate multiphase coating for suppressing columnar crystals and preparation method thereof
  • Fuel cell metal pole plate multiphase coating for suppressing columnar crystals and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation method of Ti and Al multiphase coating for metal electrode plate of proton exchange membrane fuel cell:

[0040] (1) Surface pretreatment: After cleaning the stainless steel metal electrode plates with alkali solution and acid solution respectively, they are cleaned with deionized water, and then placed in absolute ethanol, acetone, and absolute ethanol for ultrasonic vibration treatment. Remove the oil stains on the surface of the metal plate to obtain a clean metal plate;

[0041] (2) Put the cleaned metal plates into the chamber of the unbalanced magnetron sputtering ion plating furnace and vacuumize to less than 3×10 -5 torr, filled with argon gas, working pressure maintained at 4×10 -4 Torr, the substrate bias voltage of the metal plate is -600V, the ion source is turned on for ion bombardment to remove the passivation layer of the substrate, the ion plating sputtering cleaning process time is 30min, the plate is hung on the rotating support, and the support ...

Embodiment 2

[0047] A Ti and Si multiphase coating used for the metal electrode plate of proton exchange membrane fuel cell and its preparation method:

[0048] (1) Surface pretreatment: After cleaning the stainless steel metal electrode plates with alkali solution and acid solution respectively, they are cleaned with deionized water, and then placed in absolute ethanol, acetone, and absolute ethanol for ultrasonic vibration treatment. Remove the oil stains on the surface of the metal plate to obtain a clean metal plate;

[0049] (2) Put the cleaned metal plates into the closed-field unbalanced magnetron sputtering furnace cavity and vacuumize to less than 3×10 -5 torr, filled with argon gas, working pressure maintained at 4×10 -4 Torr, the substrate bias voltage of the metal plate is -600V, the ion source is turned on for ion bombardment to remove the passivation layer of the substrate, the sputtering cleaning process time is 30 minutes, the plate is hung on the rotating support, and the suppor...

Embodiment 3

[0055] A Ti and Nb multiphase coating used for the metal electrode plate of a proton exchange membrane fuel cell and a preparation method thereof:

[0056] (1) Surface pretreatment: After cleaning the stainless steel metal electrode plates with alkali solution and acid solution respectively, they are cleaned with deionized water, and then placed in absolute ethanol, acetone, and absolute ethanol for ultrasonic vibration treatment. Remove the oil stains on the surface of the metal plate to obtain a clean metal plate;

[0057] (2) Put the cleaned metal plates into the cavity of the radio frequency sputtering furnace and vacuumize to less than 3×10 -5 torr, filled with argon gas, working pressure maintained at 4×10 -4 Torr, the substrate bias voltage of the metal electrode plate is -600V, the ion source is turned on for ion bombardment to remove the passivation layer of the substrate, the cleaning process time is 30 minutes, the electrode plate is hung on the rotating support, and the ...

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Abstract

The invention relates to a multi-phase coating of a metal pole plate of a fuel cell for inhibiting columnar crystal and a preparation method of the multi-phase coating. The multi-phase coating coats the metal pole plate and comprises at least one group of coating units which are sequentially arranged outwards from the upper surface of the metal pole plate; each coating unit comprises a metal two-phase layer, a metal compound three-phase layer and an anti-corrosion compact single-phase layer; and the multi-phase coating is prepared by the steps of substrate surface pretreatment of the metal pole plate, metal two-phase layer deposition, metal compound three-phase layer deposition, single-phase layer deposition and the like. Interfacial tension can be changed by a second element in an interface phase according to a Gibbs adsorption equation; the wettability on a substrate during thin film nucleation is improved; and the roughness of the thin film surface is significantly reduced. Compared with the prior art, the multi-phase coating has the advantages that two-phase metals affect each other in growth and deposition processes, in summary, avoidance of a columnar crystal structure which is easily generated by a single-phase coating is facilitated, formation of an equiaxial crystal structure with more excellent properties of the compactness and the like is facilitated, and the lifetime of the metal pole plate of the fuel cell under the working condition of the fuel cell is finally prolonged.

Description

Technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell metal electrode plate multiphase coating that inhibits columnar crystals and a preparation method thereof. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of the fuel into electrical energy. It has the advantages of high energy conversion efficiency and environmental friendliness. Compared with traditional thermal power generators, because fuel cells do not have a series of energy conversion and energy transfer processes, but directly convert chemical energy into electrical energy, it achieves a high electrical energy conversion rate of approximately 45% to 60%. Therefore, fuel cell research has received more and more attention in recent years, and is expected to be widely used in various industries such as drones, automobiles, and national defense in the near future. [0003] Proton exchange m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M4/88
CPCH01M4/88H01M4/8867H01M8/02Y02E60/50
Inventor 彭林法张伟鑫毕飞飞易培云来新民
Owner SHANGHAI JIAOTONG UNIV
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