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Method capable of improving corrosion resistance of low carbon WC/12Co coating in molten zinc

A technology of corrosion performance and coating, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of unstable ternary alloy phase, affect the corrosion resistance of molten zinc, etc., and achieve the effect of improving performance

Inactive Publication Date: 2014-01-01
WUXI FULAIDA PETROLEUM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, when producing low-carbon WC / 12Co powder, it is easier to obtain CoxWyC (h-phase) ternary alloy phase in low-carbon WC / 12Co composite spray powder by reducing the carbon content in WC, but , this ternary alloy phase is unstable at high temperature, and it is easy to decompose to form W2C phase or even W phase in the later HVOF process, which affects the resistance of this low-carbon WC / 12Co coating. Corrosion properties of molten zinc

Method used

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  • Method capable of improving corrosion resistance of low carbon WC/12Co coating in molten zinc
  • Method capable of improving corrosion resistance of low carbon WC/12Co coating in molten zinc
  • Method capable of improving corrosion resistance of low carbon WC/12Co coating in molten zinc

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Effect test

Embodiment 1

[0016] A method that can improve the corrosion resistance of low-carbon WC / 12Co coatings comprises the following steps:

[0017] a, being sprayed with the sinking roller of the low-carbon WC / 12Co coating that is sprayed with a thickness of 100 microns is placed in the vacuum furnace;

[0018] b. Extract the air in the vacuum furnace so that the air pressure in the furnace is 5pa;

[0019] c. Heat the vacuum furnace at a speed of 5°C / min, heat the vacuum furnace to 950°C and keep it warm for 2 hours;

[0020] d. After the heat preservation is over, turn off the power of the vacuum furnace and let the sinking roller cool down with the furnace. When the temperature of the vacuum furnace cools down to 100°C, turn on the vacuum furnace and take out the sinking roller.

[0021] The average coating thickness is about 100 microns, and the WC / 12Co coating with a carbon content of 4.3%, after the above-mentioned vacuum heat treatment, its resistance to molten zinc corrosion increases f...

Embodiment 2

[0023] A method that can improve the corrosion resistance of low-carbon WC / 12Co coatings comprises the following steps:

[0024] a, being sprayed with the sinking roller of the low-carbon WC / 12Co coating that thickness is 50 microns is placed in the vacuum furnace;

[0025] b. Take out the air in the vacuum furnace, so that the air pressure in the furnace is at 0.1pa;

[0026] c. Heat the vacuum furnace at a speed of 2°C / min, heat the vacuum furnace to 860°C and keep it warm for 1 hour;

[0027] d. After the heat preservation is over, turn off the power of the vacuum furnace and let the sinking roller cool down with the furnace. When the temperature of the vacuum furnace cools down to 20°C, turn on the vacuum furnace and take out the sinking roller.

[0028] The average coating thickness is about 50 microns, and the WC / 12Co coating with 4.3% carbon content, after the above-mentioned vacuum heat treatment, its anti-melting zinc corrosion time is increased from 7 days to about ...

Embodiment 3

[0030] A method that can improve the corrosion resistance of low-carbon WC / 12Co coatings comprises the following steps:

[0031] a, being sprayed with the sinking roller of the low-carbon WC / 12Co coating that is sprayed with a thickness of 150 microns is placed in the vacuum furnace;

[0032] b. Take out the air in the vacuum furnace so that the air pressure in the furnace is at 10pa;

[0033] c. Heat the vacuum furnace at a speed of 2~12°C / min, heat the vacuum furnace to 1000°C and keep it warm for 3 hours;

[0034] d. After the heat preservation is over, turn off the power of the vacuum furnace and let the sinking roller cool down with the furnace. When the temperature of the vacuum furnace cools down to 200°C, turn on the vacuum furnace and take out the sinking roller.

[0035] The average coating thickness is about 150 microns, and the WC / 12Co coating with a carbon content of 4.3%, after the above-mentioned vacuum heat treatment, its anti-melting zinc corrosion time is in...

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Abstract

The invention discloses a method capable of improving the corrosion resistance of a low carbon WC / 12Co coating in molten zinc. The method comprises the following steps: placing a sink roll coated with the low carbon WC / 12Co coating of 50 to 150 micrometers in thickness in a vacuum furnace; pumping out air in the vacuum furnace to ensure that the internal air pressure of the furnace is within 0.1 pa to 10 pa; heating the vacuum furnace at the speed of 2 to 12 DEG C / min to 860 to 1000 DEG C and preserving heat for 1 to 3 hours; after heat preservation, turning off the power supply of the vacuum furnace and cooling the sink roll together with the furnace, afterwards, opening the vacuum furnace and taking out the sink roll until cooling the vacuum furnace to 20 to 200 DEG C. According to the invention, a CoxWyC (h phase) ternary alloy phase transformed during the supersonic flame spray coating process is reformed in the coating, so that the corrosion resistance of the low carbon WC / 12Co coating in molten zinc can be improved.

Description

technical field [0001] The invention discloses a method capable of improving the corrosion resistance of low-carbon WC / 12Co coatings against molten zinc, and belongs to the technical field of steel heat treatment technology. Background technique [0002] In order to improve the corrosion resistance of the steel plate, it is often necessary to plate a layer of zinc on the surface of the steel plate. The current common method of galvanizing is to pass the steel plate through a zinc pot filled with molten zinc solution through a sinking roll. In order to improve the anti-melting zinc corrosion performance of the sinking roller, a layer of low-carbon WC / 12Co coating is often sprayed on the surface of the sinking roller by supersonic flame spraying. The Co phase in low-carbon WC / 12Co mainly exists in the form of CoxWyC (h-phase) ternary alloy phase. This ternary alloy can play a very good role in resisting molten zinc corrosion. Generally speaking, when producing low-carbon WC / 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/18C23C4/04
Inventor 章诗岐
Owner WUXI FULAIDA PETROLEUM MACHINERY