Preparation process of gradient coating on surface of automobile hub
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A surface gradient and automobile wheel technology, which is applied in the direction of pressure inorganic powder coating, rolling resistance optimization, road transportation emission reduction, etc., can solve the problem of low coating density, reduce pores in the coating, and improve adhesion , the effect of cost reduction
Pending Publication Date: 2022-08-02
JIANGSU POMLEAD CO LTD
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This process mainly applies AlxFeNiSiTi high-entropy alloy with good comprehensive performance to the coating of aluminum alloy hub, which can effectively improve the hardness and corrosion resistance of the hub surface, but the coating density is not high, and the coating formed by stainless steel shot blasting porosity defect
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[0037] A preparation process of a gradient coating on the surface of an automobile wheel hub, comprising the following steps:
[0038] 1) Three materials required for the preparation of gradient coatings: Al x FeNiSiTi high entropy alloy powder, Al x FeNiSiTi high entropy alloy powder + 5vol.% SiC mixed powder and Al x FeNiSiTi high-entropy alloy powder + 10vol.% SiC mixed powder; Al x The range of x in FeNiSiTi high entropy alloy powder is 0.2~1.0, Al x The diameter of FeNiSiTi high-entropy alloy powder particles is 300-1000 mesh, and the particle diameter of SiC is 300-1500 mesh; the volume fraction of SiC in the gradient coating mixed material is 1-10 vol.%, and the thickness of each material in the gradient coating 20~50μm;
[0039] 2) Using cold spray technology, the Al x FeNiSiTi high-entropy alloy powder is uniformly sprayed on the surface of the aluminum alloy wheel hub;
[0040] 3) The composite electrodeposition process is adopted, the hub is the cathode, and the...
Embodiment 1
[0046] A process method for preparing a high-hardness corrosion-resistant wheel hub coating, comprising the following steps:
[0047] 1) In a vacuum atmosphere, configure three coating materials: Al x FeNiSiTi high entropy alloy powder; Al x FeNiSiTi high-entropy alloy powder + 10vol.% SiC mixed powder; Al x FeNiSiTi high-entropy alloy powder + 10 vol.% SiC mixed powder (respectively denoted as material-1 / 2 / 3).
[0048] 2) as figure 1 As shown in the figure, the material-1 is uniformly sprayed on the surface of the aluminum alloy wheel hub by the cold spraying technology. The working gas of the cold spraying system is nitrogen, the air pressure is 1.2MPa, the spraying temperature is 300℃, the spraying distance is 12mm, and the moving speed is 10mm / s . After spraying, a coating with a thickness of 30 μm was obtained, which was loose and had many pores.
[0049] 3) as figure 2 As shown, the composite electrodeposition process is adopted, the hub sprayed with material-1 is...
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Abstract
The invention belongs to the technical field of automobile hubs, and particularly relates to a preparation process of an automobile hub surface gradient coating, which comprises the following steps of: spraying mixed powder of AlxFeNiSiTi high-entropy alloy powder and SiC powder on the surface of an aluminum alloy automobile hub by adopting a composite electrodeposition process and taking the automobile hub as a cathode and nickel as an anode; the spraying powder comprises three layers: Al < x > FeNiSiTi high-entropy alloy powder, Al < x > FeNiSiTi high-entropy alloy powder + 5vol.% SiC, and Al < x > FeNiSiTi high-entropy alloy powder + 10vol.% SiC. After powder is sprayed on the surface of the hub, Ni ions enter powder gaps and are reduced, deposited and filled in particle gaps through composite electrodeposition, the surface of the aluminum alloy hub is connected, pre-laid powder particles are connected, and a composite deposition layer well combined with the surface of the aluminum alloy hub is formed. Each layer is deposited, the surface of the hub is covered with stainless steel microspheres, the stainless steel microspheres are ultrasonically vibrated to impact the deposition surface at high frequency, deposition layer pores are eliminated, and the deposition layer is compact and well combined with the surface of the hub; and the gradient coating is formed on the surface of the aluminum alloy hub through layer-by-layer deposition.
Description
technical field [0001] The invention belongs to the technical field of automobile wheel hubs, and particularly relates to a preparation process of a gradient coating on the surface of automobile wheel hubs. Background technique [0002] With the rapid development of the automobile industry, aluminum alloy wheels have gradually entered the market instead of steel wheels. Aluminum alloy wheels have a very important application prospect and value in the current automotive industry, and have the characteristics of high strength, low density, and good heat dissipation. However, the wear resistance of the aluminum alloy wheel hub is relatively poor and the impact resistance is low. Therefore, whether it is in production or in actual use, various defects on the surface of the aluminum alloy wheel hub are inevitable. Surface treatment for wear resistance and impact resistance is very important to improve the performance and life of aluminum alloy wheels. [0003] At present, the m...
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