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Method for enhancing bonding strength of aluminum coating

A technology combining strength and aluminum coating, which is applied in the field of metal surface treatment, can solve problems such as unsuitability for cold spraying and thermal influence of base metal, and achieve the effects of improved deposition efficiency, increased coating thickness, and high density

Inactive Publication Date: 2012-10-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is worth noting that high-temperature heat treatment is required in this prior art. Although the bonding strength of the coating can be improved to a certain extent, high-temperature diffusion treatment will inevitably have a thermal impact on the base metal.
In addition, the aluminum-magnesium intermediate compound coating cannot be prepared by this technology, because the nature of the magnesium powder is extremely active, and it is not suitable as a raw material for cold spraying

Method used

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  • Method for enhancing bonding strength of aluminum coating
  • Method for enhancing bonding strength of aluminum coating
  • Method for enhancing bonding strength of aluminum coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The selected aluminum powder is high-purity aluminum powder, the purity (mass fraction) is greater than 99%, and the shape is irregular. After sieving, the particles with a particle diameter of less than 45 μm are obtained; the selected aluminum-magnesium intermetallic compound powder is Mg 17 al 12 Spherical powder with an average particle diameter of 58 μm. The original morphology of the two powders is as follows figure 1 shown. The matrix used is Al6061 aluminum alloy in T6 state. High-purity aluminum powder and Mg 17 al 12 The spherical powders are mixed according to the atomic ratio of 75:25, and then mechanically mixed for 10-30 minutes to obtain the mixed powder. The surface of the aluminum substrate was cleaned with acetone, dried, and then cold sprayed with the above-mentioned mixed powder. The working gas and particle carrier gas in cold spraying are both helium, the pressure and temperature of the working gas at the inlet of the spray gun are 0.98MPa an...

Embodiment 2

[0028] Select the same aluminum powder, aluminum-magnesium intermetallic compound powder and matrix as in Example 1. High-purity aluminum powder and Mg 17 al 12 The spherical powders are mixed according to the atomic ratio of 50:50, and then mechanically mixed for 10-30 minutes to obtain the mixed powder. The surface of the aluminum substrate was cleaned with acetone and dried. This is followed by cold spraying with the above mixed powder. The working gas and particle carrier gas in cold spraying are both helium, the pressure and temperature of the working gas at the inlet of the spray gun are 0.98MPa and 300°C respectively, the pressure of the carrier gas is 1.04MPa, and the temperature is room temperature. The powder feeding rate is controlled at about 15g / min, the distance from the outlet of the spray gun to the surface of the substrate is 10mm, the moving speed of the substrate relative to the spray gun is 1mm / s, and a single pass is deposited. The resulting coating is...

Embodiment 3

[0030] Select the same aluminum powder and aluminum-magnesium intermetallic compound powder as in Example 1. The matrix used is cast AZ91D magnesium alloy. High-purity aluminum powder and Mg 17 al 12 The spherical powders are mixed according to the atomic ratio of 25:75, and then mechanically mixed for 10-30 minutes to obtain the mixed powder. The surface of the magnesium substrate was cleaned with acetone and dried. This is followed by cold spraying with the above mixed powder. The working gas and particle carrier gas in cold spraying are both helium, the pressure and temperature of the working gas are 0.98MPa and 300°C, the pressure of the carrier gas is 1.04MPa, and the temperature is room temperature. The powder feeding rate is about 15g / min, the distance from the outlet of the spray gun to the surface of the substrate is 10mm, the moving speed of the substrate relative to the spray gun is 2mm / s, and the deposition is performed in two passes. The resulting coating is ...

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Abstract

The invention provides a method for enhancing bonding strength of an aluminum coating, which belongs to the technical field of metal surface treatment; the method comprises the following steps of: aluminium powder and Mg17Al12 spherical powder are mechanically mixed, and the mixed powder is sprayed on the surface of a substrate. In the method, a cold-spraying method is used for depositing the mixed powder of intermetallic compound powder and aluminium powder, and does not worsen other mechanical performances and chemical performances of the aluminum layer while increasing the bonding strengthof the aluminium layer.

Description

technical field [0001] The invention relates to a method in the technical field of metal surface treatment, in particular to a method for improving the bonding strength of an aluminum coating. Background technique [0002] Aluminum and aluminum alloy materials have excellent mechanical properties and corrosion resistance, so they are widely used in transportation, aerospace, 3°C and military fields. In addition to being a structural material, an important application of aluminum and aluminum alloy materials is as a coating to protect the base material, expand the application field of the base material and improve the service life of the base material. At present, the main preparation methods of aluminum coatings include thermal spraying (plasma spraying and flame spraying, etc.), laser cladding, vapor deposition and electroplating. However, aluminum is one of the most active metals in chemical properties. Traditional deposition methods inevitably cause defects such as grain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/04
Inventor 卜恒勇卢晨陈彬李晓玲
Owner SHANGHAI JIAO TONG UNIV
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