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Corrosion-resistant fully dense thermal spraying metal alloy coating and preparation method thereof

A metal alloy, thermal spraying technology, applied in the direction of metal material coating process, coating, melting spraying, etc., can solve the problem of unsuitable shape and structure, and achieve the effect of increasing the heating temperature

Active Publication Date: 2018-03-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, this method is only applicable to self-fluxing alloy material coatings, such as nickel-based self-fluxing alloys, or iron-based self-fluxing alloys, or cobalt-based self-fluxing alloys, etc., on the other hand, it is usually applicable to coatings with a thickness greater than 500 microns Coating with a thickness of less than 1 mm, and at the same time not suitable for on-site implementation of structural parts with complex shapes or large structural parts

Method used

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  • Corrosion-resistant fully dense thermal spraying metal alloy coating and preparation method thereof
  • Corrosion-resistant fully dense thermal spraying metal alloy coating and preparation method thereof
  • Corrosion-resistant fully dense thermal spraying metal alloy coating and preparation method thereof

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Effect test

Embodiment 1

[0036] A method for preparing a corrosion-resistant fully dense thermal sprayed metal alloy coating, comprising the steps of:

[0037] Step 1: Using Mo and Ni20Cr as typical coating shell materials and core materials as initial materials, the Mo-coated NiCr core-shell structure NiCr-20Mo composite powder prepared by ball milling mechanical alloying and subsequent heat treatment is used for coating preparation. See structure figure 1 , figure 1 Among them, (a) is the cross-sectional structure of NiCr-20Mo powder (low magnification); (b) is the cross-sectional structure of NiCr-20Mo powder (high magnification); (c) is the surface morphology of NiCr-20Mo powder; figure 1 It can be seen that the dense Mo shell is completely and uniformly coated on the surface of the NiCr core powder particles, and the Mo and NiCr core particles are metallurgically bonded together through a thin intermediate diffusion layer, thus ensuring that the particles are heated in the plasma jet. In the p...

Embodiment 2

[0045] Using Mo-coated stainless steel powder as the spraying material, a 300-micron thick high-molybdenum stainless steel coating is prepared by plasma spraying on the surface of ordinary carbon steel substrates, and the coating is shot-peened with a hand-held shot-peening gun, of which 100-mesh steel is used for shot-peening Ball, the compressed air pressure for accelerating the steel ball is 0.3MPa. The corrosion resistance of ordinary low-carbon steel sprayed with coatings by electrochemical methods shows that its electrochemical potential and corrosion current are not affected by the substrate, and are completely equivalent to the coating itself, that is, the coating has achieved a good effect on the low-carbon steel substrate. Complete corrosion protection.

Embodiment 3

[0047] Use Mo-coated FeAl powder as the spraying powder, and use plasma spraying to prepare a 150-micron thick coating on the surface of heat-resistant steel, and use a hand-held sandblasting gun to carry out shot peening treatment on the coating, wherein the shot peening uses 60-mesh steel balls, compressed The air pressure is 0.4MPa. The corrosion resistance test for 50 hours under the simulated corrosive atmosphere of a garbage incinerator at 400°C to 650°C shows that the coating prepared by the present invention has basically no sulfidation corrosion, chloride corrosion, hydrochloric acid corrosion, etc., and has excellent high temperature corrosion resistance performance.

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Abstract

The invention discloses a corrosion-resistant fully dense thermal spraying metal alloy coating and a preparation method thereof and belongs to the technical field of preparation of spraying materials.According to the technical scheme, the preparation method comprises the following steps: spraying composite metal powder of a high-melting-point metal coating structure with a self-adhesive effect byutilizing a thermal spraying method so as to prepare a metal alloy coating which is highly dense, excellent in bonding with a matrix and excellent in bonding with a deposited particle interface; andperforming cold spraying or traditional shot blasting on the dense metal alloy coating to produce a high-speed steel shot particle beam with directivity, spraying the particle beam to the coating surface at a certain relative movement speed, and densifying the metal coating based on a plastic distortion effect produced by high-speed particle collision, thereby obtaining the cast-block-like fully dense metal alloy coating with excellent corrosion resistance. The method is simple in operation, wide in raw material source and high in preparation efficiency. According to the method, the metal alloy coating with excellent corrosion resistance of which the density is close to that of the block can be prepared.

Description

technical field [0001] The invention belongs to the technical field of spraying material preparation, and relates to the fields of material surface engineering technology and machine manufacturing, material protection, petrochemical industry and energy, and in particular to a corrosion-resistant fully dense thermal sprayed metal alloy coating and a preparation method thereof. Background technique [0002] Corrosion of metal alloy components is an important factor limiting their service life. Therefore, many studies have been devoted to improving the corrosion resistance of metal parts. It is generally considered that depositing a protective coating on the surface of the base metal that meets the structural load-bearing performance is an effective way to improve the corrosion resistance of the base metal. For cathodic protection coatings, the coating can act as an effective barrier to isolate the base metal from the corrosive environment and hinder or slow down the corrosion...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/12C23C4/18C23C4/08C23C4/134C23C4/129
CPCC23C4/06C23C4/08C23C4/12C23C4/129C23C4/134C23C4/18
Inventor 李长久田佳佳雒晓涛李成新杨冠军
Owner XI AN JIAOTONG UNIV
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