Thermal spraying processing method for carbon anode used for preparing fluorine

A processing method, carbon anode technology, applied in electrodes, coatings, melting spray plating, etc., can solve problems such as increased resistance, poor contact, and reduction of anodes, achieving reduced contact resistance, excellent electrical conductivity, and improved flatness Effect

Inactive Publication Date: 2012-02-01
HUAHE NEW TECH DEV COMPANY RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
3 Cites 5 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] Because the surface of the carbon anode material is uneven and there are pores inside, in the electrolytic production, the connection between the carbon anode and the copper part is poor, and the electrolyte penetrates, causing the local resistance to increase, the electrode to heat up, and...
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Abstract

The invention discloses a thermal spraying processing method for a carbon anode used for preparing fluorine, which comprises the following steps of: (i) carrying out flame baking and abrasive blasting for a carbon anode matrix by an oxygen-acetylene flamer, and purifying a carbon anode matrix surface; (ii) spraying a metal copper coating to the carbon anode matrix by the flamer; and (iii) grinding and polishing the sprayed carbon anode matrix to obtain a finished product. The thermal spraying processing method is convenient to operate, the evenness and the fineness of the carbon anode surface are improved by the coating, the carbon anode and a copper clamp plate have good contact, contact resistance is reduced, the carbon anode has excellent conductivity and can resist fluoride and hydrogen fluoride corrosion, and the service life of the carbon anode is prolonged.

Application Domain

Molten spray coatingElectrodes

Technology Topic

CorrosionThermal spraying +10

Examples

  • Experimental program(3)

Example Embodiment

[0029] Example 1
[0030] Oxygen-acetylene flame baking is used to purify the surface of the carbon anode substrate for fluorine production, and the surface temperature of the workpiece is 100℃.
[0031] Sandblasting the carbon anode substrate, compressed air pressure 0.5㎏/cm 2 , The surface roughness after sandblasting reaches Sa2.5 level.
[0032] The metal copper coating is sprayed on the carbon anode substrate, and the metal copper coating is sprayed on the carbon anode substrate with a flame spray gun. The material is sprayed copper wire. The flame center line of the spray gun intersects the workpiece axis perpendicularly, and the spray distance is 200mm; parameter control O 2 : 15SCFM, C 3 H 6 :200SCFH; The temperature of the workpiece is controlled at 150℃ during the spraying process, and the coating thickness is 0.5mm.
[0033] The sprayed carbon anode substrate is ground and polished, and the ground surface roughness reaches Ra0.5μm, which is the finished product.

Example Embodiment

[0034] Example 2
[0035] Oxygen-acetylene flame baking is used to purify the surface of the carbon anode substrate for fluorine production, and the surface temperature of the workpiece is 150℃.
[0036] Sandblasting the carbon anode substrate, the compressed air pressure is 0.6㎏/cm 2 , The surface roughness after sandblasting reaches Sa2.5 level.
[0037] The metal copper coating is sprayed on the carbon anode substrate, and the metal copper coating is sprayed on the carbon anode substrate with a flame spray gun. The material is sprayed copper wire. The flame center line of the spray gun intersects the workpiece axis perpendicularly, and the spray distance is 225mm; parameter control O 2 : 16SCFM, C 3 H 6 :220SCFH; The temperature of the workpiece is controlled at 180℃ during the spraying process, and the coating thickness is 0.7mm.
[0038] The sprayed carbon anode substrate is ground and polished, and the ground surface roughness reaches Ra0.8μm, which is the finished product.

Example Embodiment

[0039] Example 3
[0040] Use flame baking to purify the surface of the carbon anode substrate for fluorine production, and flame bake the carbon anode substrate with an oxygen-acetylene flame gun. The surface temperature of the workpiece is 200℃;
[0041] Sandblasting the carbon anode substrate, compressed air pressure 0.7㎏/cm 2 , The surface roughness after sandblasting reaches Sa2.5 level;
[0042] The metal copper coating is sprayed on the carbon anode substrate, and the metal copper coating is sprayed on the carbon anode substrate with a flame spray gun. The material is copper powder; the flame center line of the spray gun intersects the workpiece axis perpendicularly, and the spray distance is 250mm; parameter control O 2 : 18SCFM, C 3 H 6 :240SCFH; The temperature of the workpiece is controlled at 200℃ during the spraying process, and the coating thickness is 0.9mm.
[0043] The sprayed carbon anode substrate is ground and polished, and the ground surface roughness reaches Ra1.0μm, which is the finished product.
[0044] The invention is easy to operate, the coating improves the flatness and smoothness of the carbon anode surface, makes the contact between the carbon anode and the copper splint good, reduces the contact resistance, has excellent electrical conductivity and can resist fluorine and hydrogen fluoride corrosion. Increase the life of the carbon anode.
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Description & Claims & Application Information

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