A conductive anti-corrosion coating process for aluminum flow field plate

A conductive anti-corrosion and flow field plate technology, which is applied in the direction of circuits, fuel cells, electrical components, etc., can solve the problems that cannot meet the commercial application of fuel cell aluminum flow field plates, the pollution of the environment by waste liquid containing heavy metal ions, and the physical gas phase. Complicated deposition operation and other issues, to achieve the effect of excellent electrical conductivity and corrosion resistance, excellent electrical conductivity, and cheap process raw materials

Active Publication Date: 2020-09-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coatings of electroplating and electroless plating are generally precious metals such as gold and silver, and the corrosion resistance and conductivity of the coated flow field plate are improved to a certain extent. [1-3] ; but the cost of electroplating precious metals is high [4] , and it is easy to produce waste liquid containing heavy metal ions to pollute the environment; the cost of electroless plating bath is also high, and the waste liquid after treatment is seriously polluted [5]
Coatings deposited by physical vapor deposition are generally chromium-carbon, chromium-nitrogen, titanium-nitrogen and other coatings. [6-8] , although it can meet the requirements of fuel cells to a certain extent, the operation of physical vapor deposition is complicated and the equipment cost is high [9]
Therefore, considering factors such as cost, operation and performance, none of the above surface coating technologies can well meet the commercial application of fuel cell aluminum flow field plates.

Method used

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  • A conductive anti-corrosion coating process for aluminum flow field plate
  • A conductive anti-corrosion coating process for aluminum flow field plate
  • A conductive anti-corrosion coating process for aluminum flow field plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First, use 1200# sandpaper to mechanically polish the aluminum flow field plate, and then use diamond abrasive paste to perform fine polishing on the polished aluminum flow field plate; use acetone solution and ethanol solution to polish the finely polished aluminum flow field Ultrasonic cleaning of the plate; immerse the aluminum flow field plate after ultrasonic cleaning in 1mol / L NaOH solution for 30s; wash the aluminum flow field plate after alkali cleaning with deionized water for 3 times and seal it in deionized water; Immerse the pretreated aluminum flow field plate in a 3 mg / mL graphene oxide aqueous solution containing tetrahydroxyaluminate ions at a concentration of 1 mmol / L for 24 hours at a temperature of 20°C; take out the impregnated aluminum plate The flow field plate is cleaned with deionized water three times and then dried at normal temperature to obtain an aluminum flow field plate coated with a graphene oxide layer; the aluminum flow field plate coate...

Embodiment 2

[0045] First, use 1200# sandpaper to mechanically polish the aluminum flow field plate, and then use diamond abrasive paste to perform fine polishing on the polished aluminum flow field plate; use acetone solution and ethanol solution to polish the finely polished aluminum flow field Ultrasonic cleaning of the plate; immerse the aluminum flow field plate after ultrasonic cleaning in 1mol / L NaOH solution for 30s; wash the aluminum flow field plate after alkali cleaning with deionized water for 3 times and seal it in deionized water; Immerse the pretreated aluminum flow field plate in 2 mg / mL graphene oxide aqueous solution containing tetrahydroxyaluminate ions at a concentration of 80 mmol / L for 2 hours at a temperature of 60°C; take out the impregnated aluminum plate The flow field plate is cleaned with deionized water three times and dried at normal temperature to obtain an aluminum flow field plate coated with a graphene oxide layer; the aluminum flow field plate coated with ...

Embodiment 3

[0048] like Figure 1-Figure 6 As shown, firstly, the aluminum flow field plate is mechanically polished with 1200# sandpaper, and then the polished aluminum flow field plate is finely polished with diamond abrasive paste; Ultrasonic cleaning was performed on the flow field plate; the aluminum flow field plate after ultrasonic cleaning was immersed in 1mol / L NaOH solution for 30s; Ionized water; immerse the pretreated aluminum flow field plate in a 0.1 mg / mL graphene oxide aqueous solution containing tetrahydroxyaluminate ions at a concentration of 3 mmol / L for 3 hours, and the immersion temperature is 90 °C; take out The impregnated aluminum flow field plate was washed three times with deionized water and then dried at room temperature to obtain an aluminum flow field plate coated with a graphene oxide layer; the aluminum flow field plate coated with a graphene oxide layer was impregnated in 160g / L sodium hypophosphite solution for 2 hours at a temperature of 40°C; the treat...

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Abstract

The invention belongs to the technical field of a fuel cell, and discloses a conductive anti-corrosive coating process for an aluminium flow field plate. The conductive anti-corrosive coating process comprises the steps of firstly, carrying out preprocessing of polishing, precision polishing, ultrasonic cleaning, alkali cleaning, washing and the like on the aluminium flow field plate; then placing the preprocessed aluminium flow field plate into aqueous solution of graphene oxide, which contains tetrahydroxy aluminate ions, to impregnate, and after impregnation, cleaning with deionized water and carrying out normal temperature drying; and then impregnating in sodium hypophosphite solution to carry out processing, and after processing, cleaning with the deionized water and carrying out normal temperature drying. According to the invention, one compact graphene coating is coated on the surface of the aluminium flow field plate by adopting a chemical impregnation method which is simple to operate, low in cost, green and environmental-friendly. Conductivity and corrosion resistance testing results show that compared to an uncoated aluminium flow field plate, the coated aluminium flow field plate is obviously improved in corrosion resistance and is not reduced in conductivity, and thus, the requirements of the aluminium flow field plate for high corrosion resistance, high conductivity and low contact resistance in a fuel cell environment can be met.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a process method for conducting a conductive anti-corrosion coating on an aluminum flow field plate. Background technique [0002] As one of the key components in the fuel cell stack, the flow field plate's mass, volume, and cost determine the total mass, volume, and cost of the stack to a large extent. Among them, the aluminum flow field plate is favored for its low cost, small size, high strength, easy processing and excellent electrical and thermal conductivity. However, due to the relatively active nature of aluminum, the aluminum flow field plate is prone to passivation, which will increase the surface contact resistance and reduce the conductivity; it is also prone to corrosion, pollute the membrane and electrodes, and reduce the performance of the battery. At present, coating protective film on the surface of aluminum flow field plate is an effective way to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0202H01M8/0258
CPCH01M8/0202H01M8/0258Y02E60/50
Inventor 王宇新陈鹏王建宇
Owner TIANJIN UNIV
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