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A kind of high anti-corrosion composite coating and preparation method thereof

A composite coating, high corrosion resistance technology, applied in the direction of coating, metal material coating process, pressure inorganic powder coating, etc., can solve the problems of particle shedding, coating pitting, etc., achieve low porosity, corrosion resistance, etc. Stable performance and easy operation

Active Publication Date: 2019-12-24
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Studies have shown that although adding ceramic particles to the metal phase can improve the compactness of the coating, it exists in the form of mechanical mosaic in the coating, and does not form an organic whole with the metal phase, and will still occur during the corrosion process. Particle shedding leads to spotting of the coating

Method used

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  • A kind of high anti-corrosion composite coating and preparation method thereof

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Embodiment 1

[0029] A method for preparing a high corrosion-resistant composite coating, comprising the following steps in sequence:

[0030] (1) Degrease and derust the Q235 steel substrate, and then use brown corundum or white corundum to roughen it by sandblasting;

[0031] (2) Put the Al powder, Zn powder, Ni powder, Ta powder and Inconel 625 alloy powder, which are respectively 40%, 10%, 20%, 15%, and 15% by mass percentage, in a mechanical mixer and mix evenly Spraying powder is obtained afterward; the particle diameters of Al powder, Zn powder and Ni powder are all 5-45 μm, and the particle diameters of Ta powder and Inconel 625 alloy powder are 15-75 μm;

[0032] (3) Low-pressure cold spraying is used to spray evenly mixed spray powder onto the surface of the substrate after sandblasting and roughening treatment to form a cold spray composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, and the spraying pressure is 0.8MPa , the temperature of ...

Embodiment 2

[0036]A method for preparing a high corrosion-resistant composite coating, comprising the following steps in sequence:

[0037] (1) Carry out degreasing and derusting treatment on the 35CrMo steel substrate, and then use brown corundum or white corundum for sandblasting and roughening treatment;

[0038] (2) Put Al powder, Zn powder, Ni powder, Ta powder and Inconel 625 alloy powder, which are respectively 30%, 20%, 20%, 10%, and 20% by mass percentage, in a mechanical mixer and mix evenly Spraying powder is obtained afterward; the particle diameters of Al powder, Zn powder and Ni powder are all 5-45 μm, and the particle diameters of Ta powder and Inconel 625 alloy powder are 15-75 μm;

[0039] (3) Low-pressure cold spraying is used to spray evenly mixed spray powder onto the surface of the substrate after sandblasting and roughening treatment to form a cold spray composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, and the spraying pres...

Embodiment 3

[0043] A method for preparing a high corrosion-resistant composite coating, comprising the following steps in sequence:

[0044] (1) Degrease and derust the 30CrMnSiA steel substrate, and then use brown corundum or white corundum to roughen it by sandblasting;

[0045] (2) Put Al powder, Zn powder, Ni powder, Ta powder and Inconel 718 alloy powder, which are 50%, 20%, 10%, 5%, and 15% by mass percentage, in a mechanical mixer and mix evenly Finally, the spray powder is obtained; the particle size of Al powder, Zn powder and Ni powder is 5-45 μm, and the particle size of Ta powder and Inconel 718 alloy powder is 15-75 μm;

[0046] (3) Low-pressure cold spraying is used to spray evenly mixed spray powder onto the surface of the substrate after sandblasting and roughening treatment to form a cold spray composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, and the spraying pressure is 0.8MPa , the temperature of the working gas is 300°C, the...

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Abstract

The invention relates to a high corrosion resistance composite coating. It is prepared from Al powder, Zn powder, Ni powder, Ta powder and Ni alloy powder according to the mass percentage of 30-50%, 10-30%, 10-20%, 5-15%, 15-20%. . Each component in the composite coating forms an organic whole, which has high bonding strength with the substrate (greater than 50MPa) and does not fall off. During the deposition process, the gradient hardness Ta particles and Ni alloy particles achieve in-situ densification of the deposited Al-Zn-Ni The chemical effect improves the compactness of the coating, and the porosity of the coating is extremely low. When used in an environment where corrosive substances exist for a long time, the corrosive substances are not easy to enter the substrate through the pores to corrode, and the corrosion resistance is stable.

Description

technical field [0001] The invention relates to the field of material surface treatment, in particular to a high corrosion-resistant composite coating and a preparation method thereof. Background technique [0002] Corrosion is one of the main reasons for the failure of steel materials, especially for steel material parts that have been working under harsh conditions for a long time. Erosion and corrosion are very serious. Surface modification and surface coating are the most common and effective methods for corrosion protection of steel materials. [0003] Cold spraying is a new type of surface coating preparation method. It has the advantages of low deposition temperature, high coating bonding strength, and no oxidation. It is an ideal technology for preparing coatings for soft temperature-sensitive materials such as aluminum, zinc, and nickel. It is widely used Applied to the preparation of Al, Zn, Ni and other corrosion-resistant coatings. Low-pressure cold spraying (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/06C23C24/04
CPCC22C21/10C22C30/06C23C24/045
Inventor 丛大龙李忠盛吴护林张敏何庆兵宋凯强陈海涛
Owner NO 59 RES INST OF CHINA ORDNANCE IND