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Anti-corrosion composite coating on surface of magnesium alloy and preparation method and application thereof

A composite coating and magnesium alloy technology, applied in the field of metal surface treatment, can solve the problems of unsustainable corrosion resistance, unstable composite coating structure, short service life, etc., and achieve low cost, excellent corrosion resistance and low cost. Effect

Active Publication Date: 2021-07-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are deficiencies in the method of coating a layer of protective film (such as organic coating, (double-layer hydroxide) etc.) on the surface of the cold sprayed metal coating, and the coated composite coating has unstable structure, short service life, and corrosion resistance. Disadvantages such as poor performance

Method used

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  • Anti-corrosion composite coating on surface of magnesium alloy and preparation method and application thereof
  • Anti-corrosion composite coating on surface of magnesium alloy and preparation method and application thereof
  • Anti-corrosion composite coating on surface of magnesium alloy and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. The pretreatment step of magnesium alloy surface: comprise sandblasting and cleaning surface; Described sandblasting adopts the carborundum of 0.2mm, and the working air pressure of sandblasting machine is 0.6MPa, after sandblasting, ultrasonically cleans 10min through acetone solution again, Rinse the surface with deionized water and air-dry it, then weigh 4g NaOH and dissolve it in 100ml deionized water, place the sandblasted magnesium alloy in NaOH solution for 60 seconds, wash the surface with deionized water, and air-dry the surface to obtain pretreated magnesium alloy. alloy. Sandblasting and cleaning the surface to remove dust and oxide film impurities attached to the surface of the magnesium alloy; at the same time, the surface of the magnesium alloy after sandblasting has a certain roughness, which is conducive to providing chemical reaction active sites for subsequent in-situ growth. A square with a working area of ​​1x1cm is reserved on the surface of the ...

Embodiment 2

[0048] 1. The pretreatment step of magnesium alloy surface comprises sandblasting and cleaning surface; Described sandblasting adopts the corundum of 2.5mm, and the working air pressure of sandblasting machine is 0.55MPa, and after sandblasting, ultrasonically cleans 5min through acetone solution again, removes Rinse the surface with ionized water and air-dry, then weigh 6g NaOH and dissolve it in 100ml deionized water, then place the sandblasted magnesium alloy in NaOH solution for etching for 120s, wash the surface with deionized water, and air-dry the surface to obtain a pretreated magnesium alloy . Sandblasting and cleaning the surface to remove dust and oxide film impurities attached to the surface of the magnesium alloy; at the same time, the surface of the magnesium alloy after sandblasting has a certain roughness, which is conducive to providing chemical reaction active sites for subsequent in-situ growth. A square with a working area of ​​1x1cm reserved on the surface...

Embodiment 3

[0055] 1. The pretreatment step of magnesium alloy surface comprises sandblasting and cleaning surface; Described sandblasting adopts the carborundum of 0.22mm, and the working air pressure of sandblasting machine is 0.85MPa, and after sandblasting, ultrasonically cleans 10min through acetone solution again, removes Rinse the surface with ionized water and air-dry, then weigh 6g NaOH and dissolve it in 100ml deionized water, place the magnesium alloy after sandblasting in NaOH solution for etching for 80s, wash the surface with deionized water, and air-dry the surface to obtain a pretreated magnesium alloy. Sandblasting and cleaning the surface to remove dust and oxide film impurities attached to the surface of the magnesium alloy, while the surface of the magnesium alloy after sandblasting has a certain roughness is conducive to providing chemical reaction active sites for subsequent in-situ growth. The reserved working area on the surface of the magnesium alloy is 1x1cm squar...

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Abstract

The invention belongs to the technical field of metal surface treatment, and discloses an anti-corrosion composite coating on the surface of magnesium alloy and a preparation method and application thereof. The structure of the composite coating on the surface of the magnesium alloy is magnesium alloy / MgAl-LDH / Al2O3 / Ni / Zn-G / compact coating Zn5 (OH) 8Cl2-Zn4CO3 (OH) 6. According to the anti-corrosion composite coating on the surface of the magnesium alloy and the preparation method and application thereof, an LDH film is grown on a magnesium alloy matrix in situ in advance, then a Zn-G / Ni / Al2O3 coating is cold-sprayed, a Zn-G / Ni / Al2O3 / MgAl-LDH composite coating is prepared on the surface of the magnesium alloy, the composite coating is soaked in a sodium chloride solution, and a Zn5 (OH) 8Cl2 and Zn4CO3 (OH) 6 compact coating is generated on the surface of the Zn-G / Ni / Al2O3 coating. The MgAl-LDH coating of the composite coating has strong binding force with the magnesium alloy, and the corrosion resistance is excellent.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and more specifically relates to a corrosion-resistant composite coating on the surface of a magnesium alloy, a preparation method and application thereof. Background technique [0002] Among metal structural materials, magnesium alloy is one of the lightest alloys, with a density as low as 1.748g / cm3, good mechanical properties, and an elastic modulus as low as 45000MPa; high specific strength and specific stiffness; good dimensional stability , easy to process, recyclable; excellent thermal conductivity and other advantages. Therefore, it is widely used in various aspects of aerospace, automobile industry, electronic communication, and medical health industry. Although magnesium alloy materials are widely used, as structural materials, magnesium alloys have poor corrosion resistance and cannot meet the requirements of harsh environments, which severely limits the application an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04C23C26/00C23C28/00
CPCC23C26/00C23C24/04C23C28/34
Inventor 沈耿哲吴畏张留艳刘石刘钰雯揭晓华
Owner GUANGDONG UNIV OF TECH
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