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Rapid evaluation method for electrochemical corrosion tolerance of metal bipolar plate coating of fuel cell

A metal bipolar plate, fuel cell technology, applied in the direction of weather resistance/light resistance/corrosion resistance, scientific instruments, analytical materials, etc. Cost, broad application prospects, rapid and accurate evaluation of the effect

Active Publication Date: 2021-11-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this technology is that it is necessary to first obtain the impedance based on the impedance frequency characteristics of the fuel cell, extract the reaction resistance of the electrode, and measure the change of the current value. The process is very cumbersome, so it is also limited in practical application.
But there are also obvious problems, because the electrochemical reactions of different fuel cells are very different, making it very difficult to establish an ex-situ accelerated test model, and the applicability of the metal bipolar plate coating of different fuel cells remains to be discussed

Method used

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  • Rapid evaluation method for electrochemical corrosion tolerance of metal bipolar plate coating of fuel cell
  • Rapid evaluation method for electrochemical corrosion tolerance of metal bipolar plate coating of fuel cell
  • Rapid evaluation method for electrochemical corrosion tolerance of metal bipolar plate coating of fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0056] In this example,

[0057] A rapid evaluation method for the electrochemical corrosion resistance of metal bipolar plate coatings in fuel cells. The carbon coating A processed on a certain stainless steel substrate was used as the research object, and the corrosion resistance was measured at 0.6, 0.85, 1.1, 1.35 and 1.6V vs SHE, respectively. Carry out the corrosion polarization test for 3h, 6h, 9h, 12h and 24h under potential conditions, and repeat five parallel samples for each condition, including the following steps:

[0058] Step 1, measure the contact resistance:

[0059] Using an electronic micro-ohmmeter, test the contact resistance of the coating of the sample after different corrosion times under constant potential polarization conditions, and obtain a series of contact resistance data;

[0060] Step 2, regression analysis:

[0061] Perform an exponential regression on the contact resistance obtained in step 1 against the corrosion time, or perform a linear r...

Embodiment 2

[0071] This embodiment is basically the same as Embodiment 1, especially in that:

[0072] In this embodiment, the service conditions of the metal bipolar plate coating are decomposed into several intervals, and the contact resistance growth coefficients in different intervals are not the same, and the tolerance of the metal bipolar plate coating is accurately evaluated in combination with the service time of the corresponding intervals . Specifically, based on the principle that the contact resistance of bipolar plate coatings increases exponentially with the extension of corrosion time under constant potential conditions, the service conditions of fuel cell metal bipolar plate coatings are decomposed into several intervals, so that each constant potential The contact resistance growth coefficient under the condition is combined with the corresponding unit service time ratio, so as to comprehensively judge the tolerance of the coating under this working condition. As shown i...

Embodiment 3

[0085] This embodiment is basically the same as the previous embodiment, and the special features are:

[0086] In this embodiment, the metal bipolar plates of two different coating products G and H are alternately loaded into a fuel cell stack, each of which is put into five sections, and the stack is disassembled and taken out after every 1000 hours of operation. The contact resistance was measured with a bipolar plate, and the results are shown in Table 3:

[0087] Table 3. Contact resistance data of coatings H and J running in a short stack (unit: mΩcm 2 )

[0088]

[0089] It can be seen that during the operation of the stack, the contact resistance of the plating layer of each bipolar plate is less than 10mΩcm 2 , and the increase is less than 3mΩcm 2 , the change is not obvious, and the theoretical results of the tolerance of these two coatings still need subsequent operational verification. In short, although the method of online actual measurement of the stack ...

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Abstract

The invention discloses a rapid evaluation method for electrochemical corrosion tolerance of a metal bipolar plate coating of a fuel cell. The rapid evaluation method comprises the steps that coating contact resistance data are acquired after different corrosion times under constant potential; then exponential regression is carried out on the corrosion time according to the obtained contact resistance value, or linear regression is carried out on the time according to the logarithm value of the contact resistance, and a growth coefficient corresponding to the potential is obtained; a contact resistance measurement error function is introduced; and then the relationship among the contact resistance, the corrosion potential and the corrosion time is obtained by combining the steps 1, 2 and 3, so that the aim of rapidly evaluating the electrochemical corrosion tolerance of the metal bipolar plate coating of the fuel cell through off-line testing is fulfilled. The method can quickly evaluate the method and improve the performance evaluation accuracy; according to the method, the tolerance degree of the coating to different corrosion potentials is evaluated; equipment adopted by the method is simple and easy to control, and the time and cost of online service testing are reduced.

Description

technical field [0001] The invention belongs to the research field of electrochemical corrosion of metal materials, and in particular relates to a rapid evaluation method for the electrochemical corrosion resistance of metal bipolar plate coatings in fuel cells. Background technique [0002] The bipolar plate is one of the key components of the fuel cell. It has a structural support function and is also a place for the separation of the oxidizing agent and the reducing agent, collecting current and gas reaction. The bipolar plate is in an acidic, high-humidity working environment and contains hydrogen and oxygen, so it needs to have excellent corrosion resistance. Metal materials represented by 316L stainless steel are widely used as raw materials for bipolar plate processing due to their advantages of easy processing, good electrical and thermal conductivity, and low cost. corrosion. Therefore, it is necessary to modify the surface of the metal bipolar plate to enhance it...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N17/02
CPCG01N17/006G01N17/02Y02E60/50
Inventor 李谦范洪强吴元民范晨尧张捷宇
Owner SHANGHAI UNIV
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