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Nickel-base protection coating of boiler heat exchange pipe, and preparation method thereof

A technology of protective coating and heat exchange tube, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problem of unsatisfactory cost relationship between coating performance components, poor corrosion resistance, shortened life, etc. problem, to achieve the effect of superior corrosion resistance, strong practicability and improved service life

Inactive Publication Date: 2018-08-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, although the coating technology has many advantages, there are still a series of problems to be solved in the application process, such as poor corrosion resistance of the coating in the complex smoke environment, and the phenomenon of peeling off after a short period of application. Short service life, the unsatisfactory relationship between the performance of the applied coating and its component cost makes many power plants unacceptable, etc.

Method used

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  • Nickel-base protection coating of boiler heat exchange pipe, and preparation method thereof
  • Nickel-base protection coating of boiler heat exchange pipe, and preparation method thereof
  • Nickel-base protection coating of boiler heat exchange pipe, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] A preparation method of a nickel-based protective coating for boiler heat exchange tubes, comprising the following steps:

[0042] (1) In terms of mass percentage, the composition of the nickel-based protective coating is: Ni: 56%, Cr: 20%, Mo: 2.1%, Fe: 5%, Nb: 1%, Mn: 0.7%, Ti : 1.2%, Co: 1.2%, B: 0.7%, Si: 1%, Al: 4%, C: 0.1%, W: 7%, melt and blend the above components in proportion, and the melting temperature is 1600°C , and then the obtained alloy block is crushed and ball-milled into particles with a particle size of 50-55 μm;

[0043] (2) Clean and dry the surface of the heat exchange tube substrate to be coated, and then perform sandblasting (No. 22 brown corundum, with a sandblasting angle of 90°);

[0044] (3) Spray the micron-sized particles in the step (1) on the surface of the SUS304H stainless steel substrate with plasma spraying technology, and the average thickness of the coating is 300 μm, to obtain final product; the plasma spraying parameters are: v...

Embodiment 2

[0047] A preparation method of a nickel-based protective coating for boiler heat exchange tubes, comprising the following steps:

[0048] (1) In terms of mass percentage, the composition of the nickel-based protective coating is: Ni: 58%, Cr: 24%, Mo: 2%, Fe: 3%, Nb: 3%, Mn: 0.3%, Ti : 0.8%, Co: 1%, B: 0.9%, Si: 0.9%, Al: 2%, C: 0.1%, W: 4%, the above components are melted and blended in proportion, and the melting temperature is 1400 ℃, and then the obtained alloy block is crushed and ball-milled into particles with a particle size of 50-55 μm;

[0049] (2) Clean and dry the surface of the heat exchange tube substrate to be coated, and then perform sandblasting (No. 22 brown corundum, with a sandblasting angle of 90°);

[0050] (3) Spray the micron-sized particles in the step (2) on the surface of the SUS304H stainless steel substrate by plasma spraying technology, and the average coating thickness is 300 μm to obtain final product; the plasma spraying parameters are: voltag...

Embodiment 3

[0053] A preparation method of a nickel-based protective coating for boiler heat exchange tubes, comprising the following steps:

[0054] (1) In terms of mass percentage, the composition of the nickel-based protective coating is: Ni: 57.4%, Cr: 21%, Mo: 3%, Fe: 4%, Nb: 2%, Mn: 0.5%, Ti : 1%, Co: 1%, B: 1%, Si: 1%, Al: 3%, C: 0.1%, W: 5%, the above components are melted and blended in proportion, and the melting temperature is 1450 ℃, and then the obtained alloy block is crushed and ball-milled into particles with a particle size of 50-55 μm;

[0055] (2) Clean and dry the surface of the heat exchange tube substrate to be coated, and then perform sandblasting (No. 22 brown corundum, with a sandblasting angle of 90°);

[0056] (3) Spray the micron-sized particles in the step (2) on the surface of the SUS304H stainless steel substrate with plasma spraying technology, and the average coating thickness is 300 μm, to obtain final product; the plasma spraying parameters are: voltage...

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Abstract

The invention relates to a nickel-base protection coating of a boiler heat exchange pipe, and a preparation method thereof which belong to the technical field of corrosion prevention of heat exchangepipes. The nickel-base protection coating of the boiler heat exchange pipe is prepared from the following components in percentage by mass: 50 percent to 58 percent of Ni, 19 percent to 24 percent ofCr, 2 percent to 6 percent of Mo, 3 percent to 6 percent of Fe, 1 percent to 4 percent of Nb, 0.3 percent to 0.7 percent of Mn, 0.8 percent to 1.2 percent of Ti, 0.9 percent to 1.2 percent of Co, 0.7percent to 1.1 percent of B, 0.8 percent to 1.2 percent of Si, 2 percent to 5 percent of Al, 0.09 percent to 0.11 percent of C, and 3 percent to 7 percent of W. The coating provided by the invention has a small influence on heat exchange of a base body, high bonding strength, and good corrosion resistance, so that the boiler heat exchange pipe has excellent corrosion resistance, the service life of the boiler heat exchange pipe can be effectively prolonged, and the use cost of a boiler is reduced; and meanwhile, the coating provided by the invention is simple in preparation process, high in practicability and high in high performance cost ratio.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion of heat exchange tubes, and in particular relates to a nickel-based protective coating for boiler heat exchange tubes and a spraying preparation method thereof. Background technique [0002] my country's power plant boilers are mainly coal-fired, and the quality of the coal used is relatively inferior, with high ash and sulfur content, which brings great damage to the heat exchange tubes of the boiler during operation, such as Dust accumulation, wear, erosion, corrosion and other serious problems. At present, the water-cooled wall tubes, superheater tubes, reheater tubes, and economizer tubes in coal-fired power plant boilers at home and abroad have a very high frequency of corrosion and tube bursts, which are collectively referred to as "four-pipe" corrosion. They will reduce the equipment life of the power plant and increase the shutdown frequency of the unit, which poses a great threat to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C23C4/06C23C4/134
CPCC22C19/055C23C4/06C23C4/134
Inventor 陈娟汪亚军董勇马春元
Owner SHANDONG UNIV
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