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Preparation method of anti-corrosion wear-resistant iron-based amorphous coating for boiler tube bundle

A technology of iron-based amorphous and boiler tube bundles, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems that cannot be applied to large-scale structural materials, and achieve good bonding, excellent corrosion resistance, The effect of compact structure

Inactive Publication Date: 2015-01-28
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practice, amorphous materials have not been widely used. The main reason is that the shape of amorphous materials (strip, wire and powder) limits its application as a large-scale structural material.

Method used

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  • Preparation method of anti-corrosion wear-resistant iron-based amorphous coating for boiler tube bundle
  • Preparation method of anti-corrosion wear-resistant iron-based amorphous coating for boiler tube bundle
  • Preparation method of anti-corrosion wear-resistant iron-based amorphous coating for boiler tube bundle

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Experimental program
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Effect test

Embodiment 1

[0028] The method for preparing the corrosion-resistant and wear-resistant iron-based amorphous coating for the boiler tube bundle in this embodiment comprises the following steps:

[0029] Step 1, using the aerosol method to prepare iron-based amorphous alloy powder, the iron-based amorphous alloy powder is made by mixing the following raw materials in weight percentage: Mo0.5%, Cr11.0%, Ni12.5%, Si8. 0%, Al1.0%, C6.5%, the balance is Fe and unavoidable impurities; the particle size of the iron-based amorphous alloy powder is 50 μm;

[0030] Step 2. Prepare a corrosion-resistant and wear-resistant iron-based amorphous coating on the surface of the boiler tube bundle by using a plasma spraying process. The process parameters of the plasma spraying process are: arc voltage 65V, arc current 500A, argon gas flow rate 20L / min, the hydrogen flow rate is 7L / min, the spray gun moving speed is 50mm / s, and the spraying distance is 100mm; the thickness of the iron-based amorphous coatin...

Embodiment 2

[0037] The method for preparing the corrosion-resistant and wear-resistant iron-based amorphous coating for the boiler tube bundle in this embodiment comprises the following steps:

[0038] Step 1, using the aerosol method to prepare iron-based amorphous alloy powder, the iron-based amorphous alloy powder is made by mixing the following raw materials in weight percentage: Mo1.5%, Cr15.0%, Ni16.0%, Si6. 5%, Al3.0%, C8.5%, the balance is Fe and unavoidable impurities; the particle size of the iron-based amorphous alloy powder is 60 μm;

[0039] Step 2. Prepare a corrosion-resistant and wear-resistant iron-based amorphous coating on the surface of the boiler tube bundle by using a plasma spraying process. The process parameters of the plasma spraying process are: the arc voltage is 70V, the arc current is 550A, and the flow rate of argon gas The hydrogen flow rate is 25L / min, the hydrogen flow rate is 8L / min, the spray gun moving speed is 60mm / s, and the spraying distance is 110m...

Embodiment 3

[0042] The method for preparing the corrosion-resistant and wear-resistant iron-based amorphous coating for the boiler tube bundle in this embodiment comprises the following steps:

[0043] Step 1, using the aerosol method to prepare iron-based amorphous alloy powder, the iron-based amorphous alloy powder is made by mixing the following raw materials in weight percentage: Mo1.0%, Cr13.0%, Ni14.25%, Si7. 25%, Al2.0%, C7.5%, the balance is Fe and unavoidable impurities; the particle size of the iron-based amorphous alloy powder is 40 μm;

[0044] Step 2: Prepare a corrosion-resistant and wear-resistant iron-based amorphous coating on the surface of the boiler tube bundle by using a plasma spraying process. The flow rate is 15L / min, the hydrogen flow rate is 5L / min, the moving speed of the spray gun is 40mm / s, and the spraying distance is 90mm; the thickness of the iron-based amorphous coating is 200μm, and the material of the boiler tube bundle is 304H stainless steel.

[0045]...

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Abstract

The invention discloses a preparation method of anti-corrosion wear-resistant iron-based amorphous coating for a boiler tube bundle. The method comprises the following steps: 1, a fog method is adopted to prepared iron-based amorphous alloy powder, wherein the iron-based amorphous alloy powder is prepared by mixing the following raw materials in percentage by weight: 0.05-2.0% of Mo, 1.0-20.0% of Cr, 12.0-20.0% of Ni, 6.0-12.0% of Si, 0-4.0% of Al, 4.8-10.5% of C, and the balance of Fe and unavoidable impurities; 2, a plasma spraying technology is adopted to spray the surface of the boiler bundle to prepare the anti-corrosion wear-resistant iron-based amorphous coating. The iron-based amorphous coating prepared by the method disclosed by the invention is excellent in corrosion resistance, wear resistance and high-temperature stability, can protect the thermal erosion surface of the boiler tube bundle well in the hot corrosion and washout concurrent environment, so as to effectively prolong the service life of the boiler tube bundle.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying treatment, and in particular relates to a preparation method of a corrosion-resistant and wear-resistant iron-based amorphous coating for boiler tube bundles. Background technique [0002] Corrosion of the heating surface of boilers in coal-fired power plants is common. Water-cooled wall tubes, superheaters, reheaters and other high-temperature heating surfaces often fail due to high-temperature oxidation and corrosion. In recent years, with the development of boilers with large capacity and high parameters, the corrosion phenomenon has become more obvious, which has seriously affected the safe operation of power plants. With the continuous development and improvement of thermal spraying technology and the expansion of application fields, the superiority of anti-corrosion and wear resistance of thermal spraying coatings is more and more widely used in boiler pipe protection. Thermal spray...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/06C23C4/08C23C4/134
CPCC22C45/02
Inventor 陈永楠姜超平高振韩建军鲁元郝建民陈宏
Owner CHANGAN UNIV
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