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High-temperature-corrosion-resistant alloy coating of boiler heating surface and preparation method thereof

A high-temperature corrosion-resistant, alloy coating technology, applied in the direction of metal material coating process, coating, melt spraying, etc., to enhance the density and hardness, improve the density and bonding force, good tissue stability and reliable use sexual effect

Active Publication Date: 2017-08-11
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of Inconel625 alloy coating density and sealing process needs to be improved

Method used

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  • High-temperature-corrosion-resistant alloy coating of boiler heating surface and preparation method thereof
  • High-temperature-corrosion-resistant alloy coating of boiler heating surface and preparation method thereof
  • High-temperature-corrosion-resistant alloy coating of boiler heating surface and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, the high-temperature corrosion-resistant alloy coating on the heating surface of the boiler in this embodiment is a base layer 2 and a surface layer 3 from the base 1 to the outside in turn, the base layer 2 is a NiCrAlY alloy coating, and the surface layer 3 is Incone1625 / NiCr alloy coating; the thickness of the primer layer 2 is 90-110 μm, and the thickness of the surface layer 3 is 350-500 μm.

[0039] The preparation method of the high temperature corrosion resistant alloy coating on the boiler heating surface of the present embodiment comprises the following steps:

[0040] (1) Mix Inconel625 alloy powder and NiCr alloy powder uniformly in proportion to obtain composite alloy powder, and dry it for use.

[0041] Specifically weigh 75% of Inconel625 alloy powder and 25% of NiCr alloy powder by mass percentage, mix uniformly, and make an average particle diameter of 25-55 μm spherical composite alloy powder, dry the moisture in an oven wi...

Embodiment 2

[0057] Such as figure 1 As shown, the high-temperature corrosion-resistant alloy coating on the heating surface of the boiler in this embodiment is a base layer 2 and a surface layer 3 from the base 1 to the outside in turn, the base layer 2 is a NiCrAlY alloy coating, and the surface layer 3 is Incone1625 / NiCr alloy coating; the thickness of the primer layer 2 is 90-110 μm, and the thickness of the surface layer 3 is 350-500 μm.

[0058] The preparation method of the high temperature corrosion resistant alloy coating on the boiler heating surface of the present embodiment comprises the following steps:

[0059] (1) Mix Inconel625 alloy powder and NiCr alloy powder uniformly in proportion to obtain composite alloy powder, and dry it for use.

[0060] Specifically, weigh 60% of Inconel625 alloy powder and 40% of NiCr alloy powder according to mass percentage, mix them evenly, and obtain a spherical composite powder with an average particle size of 25-55 μm, dry the water in a...

Embodiment 3

[0069] Such as figure 1 As shown, the high-temperature corrosion-resistant alloy coating on the heating surface of the boiler in this embodiment is a base layer 2 and a surface layer 3 from the base 1 to the outside in turn, the base layer 2 is a NiCrAlY alloy coating, and the surface layer 3 is Incone1625 / NiCr alloy coating; the thickness of the primer layer 2 is 90-110 μm, and the thickness of the surface layer 3 is 350-500 μm.

[0070] The preparation method of the high temperature corrosion resistant Incone1625 / NiCr-NiCrAlY alloy coating of the boiler heating surface of the present embodiment comprises the following steps:

[0071] (1) Mix Inconel625 alloy powder and NiCr alloy powder uniformly in proportion to obtain composite alloy powder, and dry it for use.

[0072] Specifically, weigh 90% of Inconel625 alloy powder and 10% of NiCr alloy powder by mass percentage, mix uniformly, and obtain an average particle diameter of 25-55 μm spherical composite alloy powder, dry...

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Abstract

The invention discloses a high-temperature-corrosion-resistant alloy coating of a boiler heating surface and a preparation method of the high-temperature-corrosion-resistant alloy coating of the boiler heating surface. The high-temperature-corrosion-resistant alloy coating comprises a NiCrAlY alloy priming coating and an Incone1625 / NiCr alloy finishing coating. The preparation method of the high-temperature-corrosion-resistant alloy coating comprises the steps that (1) Incone1625 alloy powder and NiCr alloy powder are evenly mixed according to a ratio, and spherical composite alloy powder is prepared and dried and stands for use; (2) the surface of a matrix is cleaned and roughened; (3) the surface of the matrix is coated with NiCrAlY alloy powder through a thermal spraying technology, so that the priming layer is formed; (4) the priming layer is coated with the spherical composite alloy powder through the thermal spraying technology, so that the finishing layer is formed; and (5) cooling is conducted, and then the high-temperature-corrosion-resistant alloy coating is obtained. The high-temperature-corrosion-resistant alloy coating prepared through the preparation method has the advantages of being low in porosity, uniform and dense in surface and good in high-temperature corrosion resistance, achieving that all the layers are tightly combined and the like, the service life of the boiler can be prolonged, and cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coatings, in particular to a high-temperature corrosion-resistant alloy coating on a heating surface of a boiler and a preparation method thereof. Background technique [0002] Garbage incineration is currently a major means of waste disposal, but the composition of the waste is very complex, with high organic content and a large amount of harmful substances such as Cl, S, and alkali metals. These components will generate HCl gas and NaCl, KCl, etc. after high-temperature incineration Salt deposits lead to serious corrosion of the metal heating surface of the boiler. High-temperature corrosion has greatly increased the incidence of accidents, which limits the promotion and development of waste incineration technology. Therefore, it is very important to solve the problem of high temperature chlorine corrosion in waste incineration boilers. [0003] Covering the metal surface with a protect...

Claims

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Application Information

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IPC IPC(8): C23C4/073C23C4/08C23C4/129
CPCC23C4/08
Inventor 张双红杨波李茂东倪进飞刘光明翟伟王志刚
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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