Magnesium alloy surface gradient laser cladding layer and preparation technology thereof

A preparation process, laser cladding technology, applied in metal material coating process, coating, etc., can solve the problem of reducing the enhancement effect of magnesium alloy surface corrosion resistance, excessive dilution rate of substrate to cladding layer, physical properties Large differences and other problems, to achieve the effect of reducing dilution, enhancing corrosion resistance, and improving corrosion resistance

Active Publication Date: 2017-07-21
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors of the present invention found that the Ni-Cr-B-Si series nickel-based self-fluxing alloy can effectively improve the corrosion resistance of the magnesium alloy surface as a laser cladding material, but the Ni-Cr-B-Si series nickel-based self-fluxing alloy can effectively improve the corrosion resistance of the magnesium alloy surface. The physical properties of the self-fluxing alloy and the magnesium alloy base material are quite different, which easily leads to the problem that the dilution rate of the base material to the cladding layer is too large or too small, which is not conducive to the full play of the properties of the cladding material and reduces the surface of the magnesium alloy. Enhancement effect of corrosion resistance

Method used

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  • Magnesium alloy surface gradient laser cladding layer and preparation technology thereof
  • Magnesium alloy surface gradient laser cladding layer and preparation technology thereof
  • Magnesium alloy surface gradient laser cladding layer and preparation technology thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0072] 1. Use volume ratio water glass: H 2 The solution of O=1:3 is used as a binder, and the binder is mixed with Ni35 powder to make a paste or paste, and at the same time, the binder is mixed with Al-Si eutectic alloy powder to make a paste or paste shape.

[0073] 2. First cut the AZ91D magnesium alloy sheet into blocks with a DK77-40 electric discharge CNC wire cutting machine, and then use a milling machine to mill out grooves on the surface of the block AZ91D magnesium alloy. Use 180# sandpaper to polish the surface of the groove to remove the oxide skin on the surface of the groove. First coat the Al-Si eutectic alloy powder prepared into a paste or paste in the groove, control the thickness of the coating to 0.5mm, place it in a cool place to dry naturally, and then apply the prepared paste or paste Ni35 The powder is coated in the groove, and the thickness of the coating is controlled to 0.8mm, and then placed in a cool place to dry naturally.

[0074] 3. Adopt T...

Embodiment 2

[0076] This embodiment is the same as Embodiment 1, except that the parameters of the laser cladding treatment are as shown in Table 1, and sample B2 is obtained.

Embodiment 3

[0078] This embodiment is the same as Embodiment 1, except that the parameters of the laser cladding treatment are as shown in Table 1, and sample B3 is obtained.

[0079] Table 1 Laser cladding pre-coating powder ratio and process parameters

[0080]

[0081] Metallographic sample preparation is carried out to the sample prepared by comparative examples 1~3, embodiment 1~3

[0082] The clad samples were cut along the direction perpendicular to the scanning speed, ground and polished for follow-up observation. After mounting the cut sample with XQ-2B mounting machine, use 180#, 360#, 720# water sandpaper and 400#, 600#, 1000# metallographic sandpaper to polish, until the cross section only shows Tiny scratches distributed in the same direction.

[0083] The polished sample was polished with a polishing machine, and a 2.5 μm diamond polishing agent was used in the polishing process to obtain a sample with a shiny surface and almost no scratches. Clean the sample with alco...

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Abstract

The invention discloses a magnesium alloy surface gradient laser cladding layer and a preparation technology thereof. The preparation technology includes the steps that a mixture of Al-Si eutectic alloy powder and a binder is coated on the surface of a magnesium alloy base material at first; then a mixture of Ni-Cr-B-Si series nickel-base self-fusing alloy and a binder is coated after drying is completed; and a gradient preset coating can be formed after drying is completed. The gradient preset coating is treated by the adoption of a laser cladding technology, the prepared cladding layer and the base material achieve metallurgical bonding, the Ni-Cr-B-Si series nickel-base self-fusing alloy and the magnesium alloy base material can be well combined together, the effect that the property of the base material is improved can be guaranteed, and meanwhile the impact on the property of the cladding layer due to excessive dilution of the base material can be avoided. The magnesium alloy surface gradient laser cladding layer can be used for surface strengthening and modification of magnesium alloy parts in the industrial field, the application range of magnesium alloy at anti-corrosion places is widened, and the application prospects are broad.

Description

technical field [0001] The invention relates to a gradient laser cladding layer on the surface of a magnesium alloy and a preparation process thereof. Background technique [0002] Magnesium alloy has low density, high damping strength, easy processing and forming, good thermal and electrical conductivity and electromagnetic shielding performance, and can be recycled and reused. It is known as the most promising green engineering structural material in the 21st century. Magnesium is abundant on the earth, with a content of about 2.5% on the earth's surface and about 0.14% in seawater. It can be obtained by thermal reduction of magnesium oxide or electrolysis of seawater. It is widely used in automobiles, aerospace, sports, rail transit, and household electronics applications have developed rapidly. At present, magnesium alloy has become the third metal structural material after steel and aluminum alloy, and the research on its performance has attracted the attention of many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 陈传忠刘建利于慧君
Owner SHANDONG UNIV
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