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Coal-gas-corrosion-resistant gradient sealing coating structure and preparation method thereof

A technology of sealing coating and sealing layer, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problems of sealing layer damage and falling off, shortening the service life of sealing coating, etc., to increase the bonding strength and meet the requirements of Anti-corrosion of gas pollutants, effect of improving thickness and bonding performance

Inactive Publication Date: 2020-02-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the composite gradient sealing coating is mainly used in the field of military aviation, and its compression medium is mainly clean air, while the compression medium of CCPP gas compressors in iron and steel enterprises is mainly blast furnace and coke oven gas, which is a by-product of iron and steel enterprises. The gas contains a large amount of Corrosive pollutants such as hydrogen sulfide tar, naphthalene, benzene, sulfide, water vapor and solid particles, hydrogen sulfide and other pollutants enter the flow channel of the gas compressor and form a strong acid corrosive substance with the water precipitated during the cooling process of the compressor. Corrosion causes the seal layer to break and fall off, shortening the service life of the seal coat

Method used

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  • Coal-gas-corrosion-resistant gradient sealing coating structure and preparation method thereof
  • Coal-gas-corrosion-resistant gradient sealing coating structure and preparation method thereof
  • Coal-gas-corrosion-resistant gradient sealing coating structure and preparation method thereof

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preparation example Construction

[0046] The present invention also provides a preparation method of a gas corrosion-resistant gradient seal coating structure, comprising the following steps:

[0047] S1. Preparation of matrix: Manganese, chromium, silicon, nickel, copper, niobium and iron are mixed and smelted in proportion, and cooled to obtain Cr which is resistant to tar, naphthalene, benzene and sulfide corrosion 17 Ni 4 Cu 4 Nb corrosion-resistant steel, in terms of mass percentage, the corrosion-resistant steel is prepared from the following raw materials: manganese: 0-1%; chromium: 15.5-17.5%; silicon: 0-1%; nickel: 3-5% ; Copper: 3-5%; Niobium: 0.15-0.45%; the balance is iron;

[0048] S2. Prepare the bottom layer: wrap a layer of aluminum metal particles on the surface of the nickel to obtain a nickel-aluminum mixed powder with complete coating and good structure uniformity. In the nickel-aluminum mixed powder, the mass percentage of nickel and aluminum is: nickel The mass percentage is 75-85%, an...

Embodiment 1

[0059] The seal of a CCPP seven-stage gas compressor in a steel plant is taken as an example: the performance test of three types of sealing coatings with the substrate and transition layer material composition, the same spraying process as plasma spraying, and the surface layer material structure and composition.

[0060] Matrix The base material is corrosion-resistant steel; the bottom layer is nano-scale nickel-aluminum powder with complete coating and good uniformity. The percentage is 80%, and the aluminum mass percentage is 20%;

[0061] The material of the surface layer is a composite material of aluminum-silicon polyphenylene, the mass percentage of aluminum and silicon elements is 65%, the mass percentage of polyphenylene is 25%, and the mass percentage of Mo is 10%.

Embodiment 2

[0063] The seal of a CCPP seven-stage gas compressor in a steel plant is taken as an example: the performance test of three types of sealing coatings with the substrate and transition layer material composition, the same spraying process as plasma spraying, and the surface layer material structure and composition.

[0064] Matrix The base material is corrosion-resistant steel; the bottom layer is nano-scale nickel-aluminum powder with complete coating and good uniformity. The percentage is 3%, and the aluminum mass percentage is 3%;

[0065] The surface material is made of corrosion-resistant aluminum-silicon-graphite, the mass percentage of aluminum is 30%, the mass percentage of silicon is 35%, and the mass percentage of graphite is 35%.

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Abstract

The invention discloses a coal-gas-corrosion-resistant gradient sealing coating structure which comprises a substrate, a bottom layer and a surface layer, wherein the bottom layer is arranged above the substrate; the surface layer is arranged above the bottom layer; and the substrate adopts Cr17Ni4Cu4Nb corrosion-resistant steel capable of preventing tar, naphthalene, benzene and sulphide corrosion. A substrate material is chromium in the Cr17Ni4Cu4Nb corrosion-resistant steel, can perform an oxidation reaction with an oxidizing medium in coal gas to form a chromium-rich oxidation film to prevent the oxidizing medium from infiltration by a metal surface, and can be automatically recovered to realize corrosion protection and corrosion resistance; ions such as chromium and molybdenum in thesubstrate material can automatically supplement a space formed by spot corrosion of sulfur ions to alloy steel; a dense protection layer is formed; development of the spot corrosion to a depth direction is prevented; corrosion protection and corrosion resistance functions are exerted; coal gas pollutant corrosion protection of a coal gas compressor substrate is met; and the compressing efficiencyof a compressor and the generating efficiency of a CCPP generator set are improved.

Description

technical field [0001] The invention belongs to the technical field of sealing coatings in the iron and steel industry, and in particular relates to a gas corrosion-resistant gradient sealing coating structure and a preparation method thereof. Background technique [0002] With the increasing development of aviation technology and the increasing shortage of energy sources, higher and higher requirements are placed on the efficiency of engines. According to information, in a high-pressure turbine, every time the gap between the blade and the casing is reduced by 0.13-0.25mm, the fuel consumption can be reduced by 0.5% to 1.0%, and the engine efficiency can be increased by about 2%. However, during the manufacture and operation of the engine, due to: thermal expansion of engine components and thermal deformation of the shaft; blade elongation caused by centrifugal force due to high-speed rotation of the rotor; tolerance of parts processing and deviation of engine assembly; eng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/04C23C4/08C23C4/18
CPCC23C4/04C23C4/08C23C4/18C23C4/134
Inventor 刘刚锋欧阳德刚粟伟明冯乾鸿田维汉杜娜
Owner 武汉钢铁有限公司
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