CN214271068U

CN214271068U - Electrolytic polar plate

Info

Publication number: CN214271068U
Application number: CN202022218809.5U
Authority: CN
Inventors: 谢敏; 雷同鑫; 鞠辉; 高雪燕
Original assignee: Hunan Changde Nafir New Material Technology Co ltd; Hunan Nanofilm New Material Technology Co ltd
Current assignee: Hunan Changde Nafir New Material Technology Co ltd; Hunan Nanofilm New Material Technology Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-09-24
Anticipated expiration: 2030-09-30

Abstract

The application discloses an electrolytic polar plate, which comprises a polar plate body, wherein a nickel-tungsten alloy coating is arranged on the surface of the polar plate body. The electrolytic pole plate has the advantages of simple structure, excellent corrosion resistance, good conductivity, long service life and easy processing.

Description

Electrolytic polar plate

Technical Field

The utility model relates to an electrolysis hydrogen manufacturing technical field especially relates to an electrolysis polar plate.

Background

Water electrolysis is the decomposition of water under the action of direct current to produce hydrogen or oxygen. The electrolytic cell in the whole water electrolysis equipment is one of the most central devices. The water electrolysers commonly used in industry are generally composed of tens to hundreds of cells laminated in a regular manner. Each small electrolysis chamber consists of an anode plate, an oxygen catalytic electrode, a gas barrier diaphragm, an insulating sealing gasket, a hydrogen catalytic electrode, a cathode plate and the like. The anode plate and the cathode plate are usually made of carbon steel plates.

Since the electrolyte composed of a strong acid electrolyte has strong corrosivity to metals, the electrolyte of the electrolytic cell generally adopts a potassium hydroxide or sodium hydroxide solution with the concentration of 25-30%; meanwhile, the working temperature of the electrolytic cell is generally 85 ℃ to 90 ℃. Under such alkali concentration and temperature conditions, carbon steel plates are extremely susceptible to corrosion. In order to improve the corrosion resistance of the carbon steel plate, in the prior art, the water electrolysis industry generally adopts the nickel-plated carbon steel plate as the anode and cathode plates of the water electrolysis bath.

However, according to the results of the investigation, it is not possible to completely cover the nickel-plated steel sheet with the nickel-plated layer, and the occurrence of the micro-pores is inevitable. The existence of the micropores enables chloride ions in the electrolyte to easily enter and be enriched in the micropores, and the chloride ions and iron ions are subjected to hydrolysis reaction to corrode the electrode plate. In addition, the galvanic corrosion in the electrolysis process also easily causes the carbon steel plate to lose electrons and be dissolved. Once the polar plate is seriously corroded, the problems of mutual connection of hydrogen and oxygen, electric leakage, alkali leakage and the like are caused, so that explosion is possibly caused, and the safety of personnel and equipment is threatened.

Therefore, how to provide an electrolytic plate with simple structure, corrosion resistance and long service life becomes a technical problem to be solved urgently by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an electrolytic polar plate, this electrolytic polar plate simple structure, corrosion resisting property are excellent, electric conductive property is good, long service life, and easy to process. The utility model provides a pair of electrolytic polar plate, which comprises a polar plate body, wherein a nickel-tungsten alloy coating is arranged on the surface of the polar plate body.

Preferably, the nickel-tungsten alloy coating is a nickel-tungsten-phosphorus ternary alloy.

Preferably, the thickness of the nickel-tungsten alloy plating layer is more than 15 μm.

Preferably, the thickness of the nickel-tungsten alloy plating layer is 15-25 μm.

Preferably, the hardness of the nickel-tungsten alloy plating layer is 650-900 Hv.

Preferably, a nickel coating is further arranged between the polar plate body and the nickel-tungsten alloy coating.

Preferably, the thickness of the nickel plating layer is 5-10 μm.

Preferably, the polar plate body is of a net structure.

Preferably, the inner wall of the mesh structure is sequentially provided with the nickel coating and the nickel-tungsten alloy coating, and the nickel-tungsten alloy coating is arranged outside the nickel coating.

Preferably, the pole plate body is a solid plate, the surface of the pole plate body is provided with an embossing groove, and the embossing groove forms a concave-convex pattern on the surface of the pole plate body.

The utility model provides a pair of electrolytic polar plate, which comprises a polar plate body and a nickel-tungsten alloy coating arranged on the surface of the polar plate body. Compared with the traditional nickel plating protection, the nickel-tungsten alloy plating layer has the advantages that the nickel and tungsten elements in the plating layer have high chemical stability and strong acid and alkali corrosion resistance; moreover, the nickel-tungsten alloy has obvious catalytic action (Ni-W is more than Ni-Fe is more than Ni-Cr is more than Ni) on hydrogen evolution reaction, and can effectively improve the hydrogen evolution catalytic performance of the polar plate; meanwhile, the nickel-tungsten alloy plating layer is uniform and compact, has good conductivity, can effectively reduce the cell pressure of the electrolytic cell in the using process, and saves electric energy.

Therefore, the electrolytic plate provided by the application not only has the advantages of bright appearance and high surface hardness, but also can show more excellent corrosion resistance particularly in an alkaline environment due to the small corrosion rate of the nickel-tungsten alloy coating, and has a better pitting corrosion resistance effect on chloride ions and the like, so that the corrosion resistance of the plate body can be greatly improved, and the service life of the plate body can be prolonged. On the other hand, the nickel-tungsten alloy plating layer is uniform and compact, the porosity is low, the conductivity is good, the cell pressure of the electrolytic cell can be effectively reduced in the using process, the stable operation of equipment is ensured, and the production cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a cross-sectional view of a single plated electrolytic plate;

FIG. 2 is a cross-sectional view of a double coated electrolytic plate;

in the figure, 1-pole plate body, 2-nickel coating and 3-nickel-tungsten alloy coating.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the utility model provides an adopt progressive mode to write.

As shown in fig. 1 to 2, the utility model provides an electrolytic pole plate, which comprises a pole plate body 1, wherein a nickel-tungsten alloy coating 3 is arranged on the surface of the pole plate body 1.

Compared with the traditional nickel plating protection, the nickel-tungsten alloy plating layer 3 is arranged on the surface of the polar plate body 1, and compared with the traditional nickel plating protection, nickel and tungsten elements in the plating layer have high chemical stability and strong corrosion resistance to acid and alkali; moreover, the nickel-tungsten alloy has obvious catalytic action (Ni-W is more than Ni-Fe is more than Ni-Cr is more than Ni) on hydrogen evolution reaction, and can effectively improve the hydrogen evolution catalytic performance of the polar plate; meanwhile, the nickel-tungsten alloy plating layer 3 is uniform and compact, has good conductivity, can effectively reduce the cell pressure of the electrolytic cell in the use process, and saves electric energy.

Therefore, the electrolytic plate provided by the application not only has the advantages of bright appearance and high surface hardness, but also can greatly improve the corrosion resistance of the plate body 1 and prolong the service life of the plate body because the nickel-tungsten alloy coating 3 has low corrosion rate, can particularly show more excellent corrosion resistance in an alkaline environment and has better pitting resistance effect on chloride ions and the like. On the other hand, the nickel-tungsten alloy plating layer 3 is uniform and compact, has low porosity and good conductivity, and can effectively reduce the cell pressure of the electrolytic cell in the use process, ensure the stable operation of equipment and reduce the production cost.

Preferably, in the present invention, the nickel-tungsten alloy plating layer 3 is plated on the surface of the plate body 1 by an electrodeposition method. The nickel-tungsten alloy plating layer 3 obtained by the electro-deposition method is of an amorphous structure, the plating layer is uniform and compact, the conductivity is good, the cell pressure of the electrolytic cell can be effectively reduced in the using process, the energy consumption is saved, and the cost is reduced.

Preferably, the nickel-tungsten alloy plating layer 3 is a nickel-tungsten-phosphorus ternary alloy. The addition of phosphorus can play an electrochemical role in the process of electroplating the alloy coating, and improve the fineness of the nickel-tungsten alloy coating.

Preferably, the thickness of the nickel tungsten alloy plating layer 3 is more than 15 μm.

Preferably, the thickness of the nickel tungsten alloy plating layer 3 is 15 to 25 μm.

The thickness of the nickel-tungsten alloy coating 3 is preferably 15-25 μm, and under the condition of the thickness, the corrosion resistance of the electrolytic pole plate in an alkaline environment is excellent, and the corrosion resistance of the pole plate cannot be obviously improved by increasing the thickness of the coating, but the surface treatment cost is greatly improved. If the thickness of the plating layer is too small, a good corrosion prevention effect cannot be achieved.

Preferably, the hardness of the nickel tungsten alloy plating layer 3 is 650-900 Hv.

The utility model discloses set up nickel tungsten alloy cladding material 3 on the surface of polar plate body 1, make the 3 hardness of nickel tungsten alloy cladding material after handling be 650 supplyes 900Hv, can effectively improve the surface hardness of electrolysis polar plate, reduce colliding with of electrolysis polar plate in the in-process such as transportation, installation, keep the bright and clean roughness on electrolysis polar plate surface.

Preferably, a nickel plating layer 2 is further provided between the electrode plate body 1 and the nickel-tungsten alloy plating layer 3.

The corrosion resistance of the polar plate body 1 is improved by arranging the nickel coating 2 and the nickel-tungsten alloy coating 3 outside the polar plate body 1 and utilizing the corrosion potential difference between different coatings. The nickel plating layer 2 with the positive potential is used as a cathode, the nickel tungsten alloy plating layer 3 with the negative potential is used as an anode, the cathode is protected by self-sacrifice of the anode according to an electrochemical principle, corrosion occurs on the nickel tungsten alloy plating layer 3, original longitudinal corrosion is changed into transverse corrosion, electrochemical corrosion and corrosion risk are further reduced, and corrosion resistance is improved.

Meanwhile, the nickel coating 2 is arranged, so that the binding force between the nickel-tungsten alloy coating 3 and the polar plate body 1 can be better improved, the corrosion resistance of the electrolytic polar plate is further improved, and the service life of the electrolytic polar plate is prolonged.

Preferably, the thickness of the nickel plating layer 2 is 5 to 10 μm.

As an embodiment of the present invention, the plate body 1 is a mesh structure.

The polar plate body 1 is arranged to be of a net structure, so that the contact area between the polar plate body 1 and electrolyte can be increased, and the hydrogen evolution catalytic performance of the polar plate is further improved.

Preferably, the inner wall of the mesh structure is sequentially provided with a nickel plating layer 2 and a nickel-tungsten alloy plating layer 3, and the nickel-tungsten alloy plating layer 3 is arranged outside the nickel plating layer 2.

As another embodiment of the present invention, the plate body 1 is a solid plate.

Preferably, when the plate body 1 is a solid plate, the surface of the plate body 1 is provided with embossed grooves, and the embossed grooves form a concave-convex pattern on the surface of the plate body 1.

The arrangement of the embossing groove is beneficial to enhancing the rigidity of the polar plate body 1, eliminating internal stress and improving the bending resistance of the polar plate.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrolytic polar plate is characterized by comprising a polar plate body, wherein a nickel-tungsten alloy coating is arranged on the surface of the polar plate body;

and a nickel coating is also arranged between the polar plate body and the nickel-tungsten alloy coating.

2. The electrolytic plate of claim 1, wherein the nickel tungsten alloy coating is a nickel tungsten phosphorous ternary alloy.

3. The electrolytic plate of claim 2, wherein the nickel tungsten alloy plating has a thickness greater than 15 μm.

4. The electrolytic plate of claim 3, wherein the nickel tungsten alloy plating has a thickness of 15 to 25 μm.

5. The electrolytic plate as claimed in claim 4, wherein the hardness of the Ni-W alloy plating layer is 650-900 Hv.

6. An electrolytic plate according to any one of claims 1 to 5, wherein the nickel plating layer has a thickness of 5 to 10 μm.

7. An electrolysis plate according to any of claims 1 to 5, wherein the plate body is a mesh structure.

8. The electrolysis pole plate according to claim 7, wherein the inner wall of the mesh structure is sequentially provided with the nickel plating layer and the nickel-tungsten alloy plating layer, and the nickel-tungsten alloy plating layer is arranged outside the nickel plating layer.

9. The electrolytic plate of claim 1, wherein the surface of the plate body is provided with an embossed groove, and the embossed groove forms a concavo-convex pattern on the surface of the plate body.