Ferritic stainless steel for fuel cell bipolar plate, method for regulating and controlling surface roughness, method for forming passive film and application

A surface roughness, fuel cell technology, applied in fuel cell parts, fuel cells, anodizing and other directions, can solve the problems of poor corrosion resistance, uncontrollable growth and composition of passivation film, and difficulty in stamping. Effects of good elongation and deformability, dense and continuous, good corrosion resistance

Active Publication Date: 2022-06-03
山东产研先进材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With the rapid development of the industry in recent years, the requirements for product consistency have increased, and the main problem of the existing technical solutions for the preparation of ferritic stainless steel bipolar plates is that the deformation ability caused by the problem of composition design is poor, resulting in The forming process of the bipolar plate is difficult to form, and the deformation of the bipolar plate will also lead to problems such as poor sealing
At the same time, the cost problem caused by more alloying elements
On the other hand, the passivation film on the surface of stainless steel is an important corrosion-resistant functional layer, and its preparation process leads to the formation of a thin and discontinuous passivation film, resulting in poor corrosion resistance, uncontrollable growth and composition of the passivation film, resulting in conductive Unstable performance and corrosion resistance
In addition, besides stainless steel, titanium is currently the mainstream material for metal bipolar plates. As a material for bipolar plates, titanium has relatively poor deformation ability, is more difficult to punch, and is much more expensive than stainless steel. These all affect the consistency of the plates. Key issues such as corrosion resistance and economy need to be resolved urgently

Method used

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  • Ferritic stainless steel for fuel cell bipolar plate, method for regulating and controlling surface roughness, method for forming passive film and application
  • Ferritic stainless steel for fuel cell bipolar plate, method for regulating and controlling surface roughness, method for forming passive film and application
  • Ferritic stainless steel for fuel cell bipolar plate, method for regulating and controlling surface roughness, method for forming passive film and application

Examples

Experimental program
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Effect test

Embodiment 1-21

[0099] Ingots were prepared according to the ferritic stainless steels of different steel grades shown in the above table 1, wherein, the corresponding relationship between the ingots of each embodiment and the ferritic stainless steels of different steel grades is shown in Table 2, and the ingots are obtained by opening the ingot to 100mm The stainless steel plate is then hot rolled, the heating and holding temperature is 1200 °C, the holding time is 2h, the opening rolling temperature is controlled at 1100 °C, and the rolling is carried out to 3mm after 8 passes, and the final rolling temperature is controlled at 800 °C. After hot rolling, annealing treatment is carried out, the annealing temperature is 1050°C, and the holding time depends on the size of the hot rolled coil, and pickling treatment is carried out after hot rolling. After that, take out the air cooling, and then perform cold rolling to make a foil of the required thickness, and then perform an annealing treatme...

Embodiment 22-30

[0127] The difference from Example 1 is that electrochemical passivation treatment is performed with different parameters, and the analysis and evaluation are carried out according to the same method as Example 1. The electrochemical passivation conditions and test results of Example 1 and Examples 22-30 shown in Table 5.

[0128] table 5

[0129]

[0130]

[0131] Note: Example 30 in Table 5 is a bare sample, and on the basis of Example 1, no electrochemical passivation is performed.

[0132] It can be seen from Table 4 that by adjusting the parameter conditions of electrochemical passivation, such as nitric acid concentration, temperature, potential and passivation time within the specified range, the performance of the passivation film can be further improved. Among them, the test results of the stainless steel sample of Example 1 after serving in the fuel cell environment for a period of time show that the passivation film can not only reduce the contact resistance ...

Embodiment 31-37

[0141] The difference from Example 1 lies in the steel grade, whether the surface roughness treatment is carried out, and whether the electrochemical passivation treatment is carried out. The results are shown in Table 5. Specifically, the surface roughness treatment may be directly performed after step (1) without electrochemical passivation treatment; the electrochemical passivation treatment may also be directly performed after step (1) without surface roughness treatment; Surface roughness treatment and electrochemical passivation treatment can also be performed in sequence after step (1);

[0142] Among them, the conditions of roughness treatment are: room temperature (25 ° C), H at 3 mol / L 2 SO 4 The samples were polarized at 10 V for 50 s in solution.

[0143] The conditions of chemical passivation treatment are: 1.6mol / LHNO at 40°C for the steel sheet obtained after the above roughness treatment 3 In solution, electrochemical passivation was performed at an anode vo...

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Abstract

The invention discloses ferritic stainless steel for a bipolar plate of a fuel cell, a surface roughness regulation and control method, a method for forming a passive film and application of the ferritic stainless steel. The ferritic stainless steel comprises 0.03 wt% or less of C, 0.02 wt% or less of N, 0.4 wt% or less of Si, 0.5 wt% or less of Mn, 16-23 wt% of Cr, 0-2.0 wt% of Cu, 1.8-2.5 wt% of Mo, 0.2-2.0 wt% of Ni, 0.1-0.5 wt% of Ti, 0.005-0.5 wt% of Nb, 0.02 wt% or less of P, 0.02 wt% or less of S and the balance Fe and other unavoidable elements, and the grain size of the ferritic stainless steel is grade 4-9. The aluminum alloy has good corrosion resistance, conductivity, ductility and deformability, and has the advantages of economical efficiency and cost at the same time.

Description

technical field [0001] The invention relates to the technical field of stainless steel production, and relates to a ferritic stainless steel used in a fuel cell bipolar plate, a method for regulating surface roughness, a method for forming a passivation film and its application. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy, and a proton exchange membrane fuel cell (PEMFC) is a type of fuel cell. Because of its high power generation efficiency and non-polluting to the environment, PEMFC has attracted worldwide attention and developed rapidly. As the core component of the fuel cell, the bipolar plate serves as the membrane electrode structure support in the fuel cell, separates hydrogen and oxygen, collects electrons, conducts heat, provides hydrogen and oxygen channels, discharges the water generated by the reaction, and provides coolant flow channels important role. With the increasing requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/50C22C38/48C25D11/34C21D8/02C21D1/26H01M8/021H01M8/0228
CPCC22C38/02C22C38/04C22C38/42C22C38/44C22C38/50C22C38/48C25D11/34C21D8/0226C21D8/0236C21D8/0247C21D1/26H01M8/021H01M8/0228C21D2211/005Y02E60/50
Inventor 卢华兴席烨廷杨运民隗健
Owner 山东产研先进材料研究院有限公司
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