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Anti-corrosion and erosion coating for heating surface of waste incineration boiler

A technology of waste incineration and heating surface, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of coating corrosion and general hardness

Active Publication Date: 2017-06-06
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional protection, the construction method of supersonic arc spraying is the main method, and the material is 625 alloy as the main protective material combined with the sealing process. In the actual use process, it is found that the alloy has better heat and corrosion resistance. , but due to the average hardness, the coating is quickly corroded under the action of erosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The surface cleaning of the heated protective surface is carried out by sandblasting to remove the dirt deposited on the protective surface by incineration in the early stage, and to achieve roughening of the protective surface and enhance the surface adhesion of the coating.

[0014] After sandblasting, use Ni-50Al alloy as the base layer with a thickness of 0.03mm to improve the surface adhesion of the titanium carbide-nickel-chromium alloy layer, and use supersonic flame spraying as the construction method.

[0015] When the surface after priming still has residual heat, carry out the construction of the surface core protective layer, adopt supersonic flame spraying, and the construction material is TiC-25NiCr, wherein the composition of nickel-chromium alloy is, and the weight fraction of Cr in nickel-chromium alloy is 50%, with a thickness of 0.3 mm, a coating with excellent protective properties is obtained.

Embodiment 2

[0017] The surface cleaning of the heated protective surface is carried out by sandblasting to remove the dirt deposited on the protective surface by incineration in the early stage, and to achieve roughening of the protective surface and enhance the surface adhesion of the coating.

[0018] After sandblasting, use Ni-40Al alloy as the base layer with a thickness of 0.04mm to improve the surface adhesion of the titanium carbide-nickel-chromium alloy layer, and use supersonic flame spraying as the construction method.

[0019] When the surface after priming still has residual heat, carry out the construction of the surface core protective layer, adopt supersonic flame spraying, and the construction material is TiC-10NiCr, wherein the composition of nickel-chromium alloy is, and the weight fraction of Cr in nickel-chromium alloy is 40%, with a thickness of 0.5mm, a coating with excellent protective properties is obtained.

Embodiment 3

[0021] The surface cleaning of the heated protective surface is carried out by sandblasting to remove the dirt deposited on the protective surface by incineration in the early stage, and to achieve roughening of the protective surface and enhance the surface adhesion of the coating.

[0022] After sandblasting, use Ni-55Al alloy as the base layer with a thickness of 0.05mm to improve the surface adhesion of the titanium carbide-nickel-chromium alloy layer, and use supersonic flame spraying as the construction method.

[0023] When the surface after priming still has residual heat, carry out the construction of the surface core protective layer, adopt supersonic flame spraying, and the construction material is TiC-30NiCr, wherein the composition of nickel-chromium alloy is, and the weight fraction of Cr in nickel-chromium alloy is 65%, with a thickness of 0.4 mm, a coating with excellent protective properties is obtained.

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Abstract

The invention provides a corrosion / erosion-resistant coating for a waste incineration boiler heating surface. The coating has excellent corrosion resistance on molten salt hot corrosion and solid micro-particle erosion and is excellent in protective performance. According to the core protection layer of the coating, a titanium carbide-nickel-chromium alloy serves as a protection material, construction is performed by adopting a high velocity oxy-fuel mode, the nickel-chromium alloy layer is combined for bottoming, excellent protective performance is guaranteed, and the coating has excellent thermal shock resistance and adhesive force.

Description

technical field [0001] The invention relates to a protective coating which can be applied in corrosive and erosive environments, especially the protection of the heating surface of the water cooling wall of thermal power plants and garbage incinerators. Background technique [0002] In the process of thermal power generation and waste incineration power generation, while incineration generates high temperature, it also produces corrosive salts containing sulfur and chlorine elements, such as sodium sulfate, potassium chloride, and sodium chloride. They generally have a low melting point and can be attached to the heated surface in liquid form. Under the action of high temperature, thermal corrosion of molten salt occurs. At the same time, the ash produced by incineration often contains hard particles such as silicon dioxide, which hit the heating surface at a high speed, resulting in erosion. Under the joint action of hot corrosion and erosion, they cooperate with each othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/08
CPCC23C4/06
Inventor 杨波徐刚李茂东熊斌孙耀明
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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