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Preparation method for 420 stainless steel composite coating cold-sprayed on magnesium alloy surface

A composite coating and stainless steel technology, applied in the direction of pressure inorganic powder coating, etc., to achieve the effect of optimized wear resistance, low porosity, and compact structure

Inactive Publication Date: 2017-06-13
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of 420 stainless steel and its composite coating on the surface of magnesium alloy by cold spraying technology

Method used

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  • Preparation method for 420 stainless steel composite coating cold-sprayed on magnesium alloy surface
  • Preparation method for 420 stainless steel composite coating cold-sprayed on magnesium alloy surface
  • Preparation method for 420 stainless steel composite coating cold-sprayed on magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A: Weigh 500g of 420 stainless steel powder with a particle size of 5-30μm and a spherical shape; weigh 500g of WC-12Co powder with a particle size of 5-30μm and a spherical shape. Spray powders are obtained after mixing in a mechanical mixer.

[0022] B: Perform acetone cleaning and sandblasting roughening treatment on the surface of the magnesium alloy substrate in sequence to obtain a treated substrate. The sandblasting pressure is 1.0 MPa, the sandblasting time is 30s, and the number of sand shot used for sandblasting is 200 mesh.

[0023] C: Put the spraying powder prepared in step A into the powder feeder, then fix the magnesium alloy substrate treated in step B on the spraying fixture, and prepare 420 stainless steel / WC-12Co composite coating by cold spraying process, The specific spraying parameters are: the working gas is helium, the spraying pressure is 3.0MPa, the temperature is 600°C, the spraying distance is 20mm, the moving speed of the spray gun is 200mm / ...

Embodiment 2

[0028] A: Weigh 400g of 420 stainless steel powder, with a particle size of 5-30μm, and the powder shape is spherical; weigh 100g of SiC powder, with a particle size of 5-30μm, and the powder shape is irregular. Spray powders are obtained after mixing in a mechanical mixer.

[0029] B: The surface of the magnesium alloy substrate is cleaned with acetone and roughened by sandblasting in sequence to obtain a treated substrate; the sandblasting pressure is 0.3MPa, the sandblasting time is 10s, and the mesh number of the sand shot used for sandblasting is 40 mesh.

[0030] C: Put the spraying powder prepared in step A into the powder feeder, fix the magnesium alloy substrate treated in step B on the spraying fixture, and prepare 420 stainless steel / SiC composite coating by cold spraying process, the specific Spraying parameters are: working gas is nitrogen, spraying pressure is 3.5MPa, temperature is 700°C, spraying distance is 30mm, spray gun moving speed is 400mm / s, powder feedi...

Embodiment 3

[0036] A: Weigh 1.5kg of 420 stainless steel powder, the particle size is 5-30μm, the powder shape is spherical; weigh Al 2 o 3 The powder is 500g, the particle size is 5-30 μm, and the powder appearance is irregular. The above two powders are mixed in a mechanical mixer to obtain a spray powder.

[0037] B: Perform acetone cleaning and sandblasting roughening treatment on the surface of the magnesium alloy substrate in sequence to obtain a treated substrate. The sandblasting pressure is 0.5MPa, the sandblasting time is 10s, and the number of sand shot used for sandblasting is 40 mesh.

[0038] C: Put the spraying powder prepared in step A into the powder feeder, fix the magnesium alloy substrate treated in step B on the spraying fixture, and prepare 420 stainless steel / Al by cold spraying process 2 o 3 Composite coating; its specific spraying parameters are: working gas is nitrogen, spraying pressure is 2.5MPa, temperature is 800°C, spraying distance is 20mm, spray gun movi...

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Abstract

The invention relates to a preparation method for a 429 stainless steel composite coating sprayed on a magnesium alloy surface. The preparation method comprises the steps that 95-40wt% of 420 stainless steel powder and 5-60wt% of hard reinforcement phase material powder according to a powder mixing ratio; the above two kinds of powder are placed in a mechanical material mixing machine to be mixed so that coating powder is prepared; the magnesium alloy base material surface is sequentially subjected to acetone cleaning and sand-blasting roughening treatment; the coating powder is arranged in a powder conveying device of cold-spraying equipment; then a magnesium alloy base material is fixed on a spraying clamp, and the 420 stainless steel composite coating is manufactured on the magnesium alloy base material surface with a cold-spraying technique; and the hard reinforcement phase material is one or more of SiC, Al2O3, TiC, WC-12Co, WC-17Co, WC-CoCr, WC-NiCr. The preparation method is simple in technique; thermal influence on the magnesium alloy base material is small by adopting the cold-spraying technique; the prepared composite coating is combined with the base body firmly; the structure is compact and uniform; the coating has good corrosion-resistance and abrasion-resistance, and is an ideal surface reinforcement coating for surfaces of the magnesium alloy and components of the magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of material surface coatings, and in particular relates to a preparation method for cold-spraying 420 stainless steel composite coatings on the surface of magnesium alloys. Background technique [0002] Magnesium alloys are the lightest metal structural materials in engineering applications. The extensive application of high-performance magnesium alloy materials is one of the important ways to realize the lightweight of military and civilian high-end equipment. However, the hardness of magnesium alloy is low, and its wear resistance, corrosion resistance and high temperature resistance are poor, which restricts the wide application of magnesium alloy materials to a certain extent. Therefore, surface treatment of magnesium alloy base materials and preparation of wear and corrosion protective coatings to improve the comprehensive properties of magnesium alloys such as wear resistance and corrosion resistance h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04
CPCC23C24/04
Inventor 马冰陈杰刘光舒文波崔烺冯胜强郑子云戴宇贾利赵健
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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