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A surface treatment method for a stainless steel bipolar plate of a proton exchange membrane fuel cell

A proton exchange membrane, fuel cell technology, applied in special surfaces, pretreatment surfaces, devices for coating liquids on surfaces, etc., to achieve the effects of excellent corrosion resistance, low cost, and simple process

Active Publication Date: 2021-11-26
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These coatings can effectively improve the corrosion resistance and electrical conductivity of metal bipolar plates, but there is still a lot of work to be done for practical application

Method used

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  • A surface treatment method for a stainless steel bipolar plate of a proton exchange membrane fuel cell
  • A surface treatment method for a stainless steel bipolar plate of a proton exchange membrane fuel cell
  • A surface treatment method for a stainless steel bipolar plate of a proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 316L stainless steel is used as the base material. Before preparation, the surface of the stainless steel needs to be polished to 1000# with water abrasive paper, and then cleaned and dried with distilled water and acetone.

[0022] Using tetrabutyl titanate and niobium tetraethanolate as precursors, absolute ethanol as solvent, and glacial acetic acid as chelating agent, Ti 1- x Nb x o 2 Sol. The component distribution ratio of sol: tetrabutyl titanate: niobium tetraethanolate: distilled water: acetic acid: dehydrated alcohol is 1: x: 18.7: 2.34: 40.1 (molar ratio) wherein x is the atomic percent of Nb, and x=Nb / ( Nb+Ti) = 0.02. Use hydrochloric acid to adjust the pH value to pH<3. The obtained sol is a uniform transparent yellow sol, and the sol is aged at room temperature for one day for use.

[0023] Spin-coating method was used to spin-coat the above obtained sol on the surface of the substrate after the above-mentioned treatment, and spin-coat three times. A...

Embodiment 2

[0026] 316L stainless steel is used as the base material. Before preparation, the surface of the stainless steel needs to be polished to 1000# with water abrasive paper, and then cleaned and dried with distilled water and acetone. Using tetrabutyl titanate and niobium tetraethanolate as precursors, absolute ethanol as solvent, and glacial acetic acid as chelating agent, Ti1-x Nb x o 2 Sol. The component distribution ratio of sol: tetrabutyl titanate: niobium tetraethanolate: distilled water: acetic acid: dehydrated alcohol is 1: x: 18.7: 2.34: 40.1 (molar ratio) wherein x is the atomic percent of Nb, and x=Nb / ( Nb+Ti) = 0.04. Use hydrochloric acid to adjust the pH value to pH0.96 Nb 0.04 o 2 Corrosion resistant, conductive coating.

[0027] In a simulated PEMFC environment (0.1mol / L H at 80°C 2 SO 4 aqueous solution), using a three-electrode system: applying Ti 0.96 Nb 0.04 o 2 Coated and unapplied Ti 0.96 Nb 0.04 o 2 The coated 316L stainless steel is used as the...

Embodiment 3

[0029] 316L stainless steel is used as the base material. Before preparation, the surface of the stainless steel needs to be polished to 1000# with water abrasive paper, and then cleaned and dried with distilled water and acetone. Using tetrabutyl titanate and niobium tetraethanolate as precursors, absolute ethanol as solvent, and glacial acetic acid as chelating agent, Ti 1-x Nb x o 2 Sol. The component distribution ratio of sol: tetrabutyl titanate: niobium tetraethanolate: distilled water: acetic acid: dehydrated alcohol is 1: x: 18.7: 2.34: 40.1 (molar ratio) wherein x is the atomic percent of Nb, and x=Nb / ( Nb+Ti) = 0.02. Use hydrochloric acid to adjust the pH value to pH0.98 Nb 0.02 o 2 Corrosion resistant, conductive coating.

[0030] In a simulated PEMFC environment (0.1mol / L H at 80°C 2 SO 4 aqueous solution), using a three-electrode system: applying Ti 0.96 Nb 0.04 o 2 Coated and unapplied Ti 0.96 Nb 0.04 o 2 The coated 316L stainless steel is used as t...

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Abstract

A surface treatment method for a stainless steel bipolar plate of a proton exchange membrane fuel cell, in which a layer of Ti is synthesized on the surface of the bipolar plate 1‑ x Nb x o 2 The corrosion-resistant and conductive coating, where x represents the atomic percentage of Nb, is 2-6 at.%, and the thickness is 0.2-0.7 μm. The surface treatment method of the stainless steel bipolar plate of the proton exchange membrane fuel cell provided by the invention synthesizes a kind of Ti on the surface of the stainless steel bipolar plate of the proton exchange membrane fuel cell 1‑x Nb x o 2 Corrosion resistant, conductive coating. The process is simple and the cost is low, and it can be applied to the surface of various types of stainless steel (such as 316L, 304, 310 stainless steel). The coating has excellent corrosion resistance in acidic solutions. When the coating reaches about 0.7μm, it can protect the stainless steel substrate for a long time.

Description

technical field [0001] The invention relates to proton exchange membrane fuel cell technology, and in particular provides a surface treatment method for a stainless steel bipolar plate of a proton exchange membrane fuel cell. Background technique [0002] With the increasingly prominent problems of energy shortage and environmental pollution, it is undoubtedly of great significance to develop new energy technologies that are energy-saving, efficient, green and safe. A fuel cell is a device that directly converts chemical energy into electrical energy through electrode reactions. It has the advantages of high efficiency, low pollution, and fuel diversity. It is known as the fourth-generation power generation device after hydropower, thermal power and nuclear energy. strong support from all countries. Compared with other fuel cells, proton exchange membrane fuel cells (PEMFC) are widely used in aerospace, military, transportation and regional power stations due to their uniqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D1/28B05D3/00B05D3/02B05D7/24B05D5/00B05D5/12
Inventor 王艳丽李伟华曾潮流
Owner GUANGXI UNIV