Rapid evaluation method for electrochemical corrosion resistance of metal bipolar plate coatings for fuel cells

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: 2022-07-12
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 resistance of metal bipolar plate coatings for fuel cells
  • Rapid evaluation method for electrochemical corrosion resistance of metal bipolar plate coatings for fuel cells
  • Rapid evaluation method for electrochemical corrosion resistance of metal bipolar plate coatings for fuel cells

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Experimental program
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Effect test

Embodiment 1

[0055] In this embodiment,

[0056] A rapid evaluation method for electrochemical corrosion resistance of metal bipolar plate coatings of fuel cells Corrosion polarization tests for 3h, 6h, 9h, 12h and 24h were carried out under potential conditions, and five parallel samples were repeated for each condition, including the following steps:

[0057] Step 1, measure the contact resistance:

[0058] Using an electronic micro-ohmmeter, test the contact resistance of the coating after different corrosion times under the condition of constant potential polarization, and obtain a series of contact resistance data;

[0059] Step 2, regression analysis:

[0060] Do an exponential regression of the contact resistance obtained in step 1 to the corrosion time, or do a linear regression of the logarithm of the contact resistance to the time to obtain the corresponding growth coefficient a under the corrosion potential, that is, the expression a = F(V) , the result is figure 1 ~ As show...

Embodiment 2

[0070] This embodiment is basically the same as the first embodiment, and the special features are:

[0071] In this embodiment, the service conditions of the metal bipolar plate coating are decomposed into several intervals, and the contact resistance growth coefficients of different intervals are different, and the service time of the corresponding interval is used to accurately evaluate the tolerance of the metal bipolar plate coating. . Specifically, based on the principle that the contact resistance of the bipolar plate coating increases exponentially with the corrosion time under constant potential conditions, the service conditions of the fuel cell metal bipolar plate coating 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 in for...

Embodiment 3

[0084] This embodiment is basically the same as the previous embodiment, and the special features are:

[0085] In this embodiment, the metal bipolar plates of two different coating products G and H are alternately installed into a fuel cell stack, each with five cells, and the stack is disassembled and taken out after every 1000h of operation. The bipolar plate was used to measure the contact resistance, and the results are shown in Table 3:

[0086] Table 3. Contact resistance data for coatings H and J running in short stack (unit: mΩcm 2 )

[0087]

[0088] It can be seen that during the operation of the stack, the contact resistance of each bipolar plate coating is less than 10mΩcm 2 , and the increase is less than 3mΩcm 2 , the change is not obvious, and theoretically obtaining the tolerance results of these two coatings requires follow-up operation verification. In short, although the method of on-line measurement of the stack can directly prove the life of the co...

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Abstract

The invention discloses a rapid evaluation method for the electrochemical corrosion resistance of a metal bipolar plate coating of a fuel cell, comprising the following steps: firstly, obtaining the contact resistance data of the coating after different corrosion times under a constant potential; then comparing the obtained contact resistance value to Perform exponential regression on the corrosion time, or perform linear regression on the logarithmic value of the contact resistance against time to obtain the corresponding growth coefficient of the potential; then introduce the contact resistance measurement error function; then combine steps 1, 2 and 3 to obtain the contact resistance and corrosion potential , corrosion time, to achieve the purpose of off-line test to quickly evaluate the electrochemical corrosion resistance of the metal bipolar plate coating of the fuel cell. The method of the invention can quickly evaluate the method and improve the performance evaluation accuracy; the method of the invention evaluates the tolerance of the coating to different corrosion potentials; the equipment adopted in the invention is simple and easy to control, and reduces the time and cost of online service testing.

Description

technical field [0001] The invention belongs to the research field of electrochemical corrosion of metal materials, and particularly relates to a rapid evaluation method for the electrochemical corrosion resistance of a metal bipolar plate coating in a fuel cell. Background technique [0002] The bipolar plate is one of the key components of the fuel cell, which has the function of structural support and is also the place where the oxidant and the reductant are separated, the current is collected and the gas reacts. The bipolar plate is in an acidic, high-humidity working environment, and contains hydrogen and oxygen, and 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 carry out coating modification treatment on the surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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