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Magnesium alloy anticorrosion coating and preparation method thereof

A technology for anti-corrosion coatings and magnesium alloys, applied in the directions of anti-corrosion coatings, polyamide coatings, epoxy resin coatings, etc., to achieve the effects of high corrosion resistance, high practicability and simple preparation process

Inactive Publication Date: 2010-11-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports of using cathodic protection coatings to protect magnesium alloy substrates at home and abroad.

Method used

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  • Magnesium alloy anticorrosion coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Backup epoxy resin, polyamide, magnesium powder (average particle size 10 microns, purity 99%), defoamer BYK-A530 and titanate coupling agent according to the following mass percentages: 24% , 24%, 50%, 0.5% and 1.5%;

[0024] 2) epoxy resin is dissolved in the solvent that xylene and n-butanol are mixed by mass ratio 7: 3, is mixed with the mass fraction of epoxy resin and is the solution of 62.5%; Polyamide is dissolved in xylene and n-butanol In the solvent mixed in a mass ratio of 7:3, the mass fraction of polyamide prepared into a solution is 62.5%;

[0025] 3) After mixing the magnesium powder with the epoxy resin solution prepared in step 2), add a titanate coupling agent, stir evenly, and then add the polyamide solution prepared in step 2) and the defoamer BYK-A530, After dispersing for 5 minutes, aging for 5 minutes to obtain the magnesium alloy anti-corrosion coating.

Embodiment 2

[0027] 1) Backup epoxy resin, polyamide, magnesium powder (average particle size 30 microns, purity 99%), defoamer BYK-A530 and titanate coupling agent according to the following mass percentages: 22% , 22%, 55%, 0.5% and 0.5%;

[0028] 2) with step 2) in embodiment 1;

[0029] 3) Same as step 3) in Example 1.

Embodiment 3

[0031] 1) Back up epoxy resin, polyamide, magnesium powder (average particle size 60 microns, purity 99%), defoamer BYK-A530 and titanate coupling agent according to the following mass percentages: 19.25% , 19.25%, 60%, 0.5% and 1%;

[0032] 2) with step 2) in embodiment 1;

[0033] 3) Same as step 3) in Example 1.

[0034] Table 1 shows the performance evaluation results of the magnesium alloy anti-corrosion coatings prepared in Examples 1-3. All tests are carried out according to national standards. The salt spray test adopts the scratch method (GB / T1771-1991), and the evaluation standard is scratch Pitting or bubbling begins to appear at the marks. As can be seen from the table, the adhesion and impact strength of the magnesium alloy anti-corrosion paint prepared by the present invention are similar to those of ordinary epoxy varnishes, while its salt spray resistance is greatly improved compared with ordinary epoxy varnishes. All the test pieces installed can pass the t...

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Abstract

The invention discloses a magnesium alloy anticorrosion coating and a preparation method thereof, and belongs to the field of metal corrosion and protection. The invention aims to solve the problem that magnesium alloy is easy to corrode in application. A dry film of the coating provided by the invention comprises the components in percentage by mass: 19 to 25 percent of epoxy resin, 19 to 25 percent of polyamide, 50 to 60 percent of pure magnesium powder, 0.5 percent of deformer BYK-A530 and 0.5 to 1.5 percent of titanate coupling agent. In the method, the epoxy resin and the polyamide are respectively dissolved in the mixture solution of xylene and n-butanol in a mass ratio of 7:3 to respectively prepare the solution with the mass fraction of 62.5 percent; the magnesium powder and epoxy resin solution are mixed uniformly, the titanate coupling agent is added, the mixture is stirred uniformly, polyamide solution and the deformer BYK-A530 are added, and the mixture is dispersed for 5 minutes and cured for 5 minutes to obtain the magnesium alloy anticorrosion coating. The coating has the advantages of high cathodic protection and corrosion resistance and simple preparation process.

Description

technical field [0001] The invention belongs to the field of metal corrosion and protection, and in particular relates to a coating suitable for anticorrosion of a magnesium alloy substrate and a preparation method thereof. Background technique [0002] Magnesium alloy is known as an ideal electronic product in the 21st century because of its excellent specific strength, specific stiffness, shock absorption performance, cutting performance, polishing performance, electromagnetic shielding characteristics and auxiliary heat dissipation function, low density, and large energy attenuation coefficient. Alternative material for housings and light vehicles. However, magnesium alloy has not been widely used like aluminum alloy so far, and the most important reason is its poor corrosion resistance. Magnesium is severely corroded in both acidic and neutral solutions, and magnesium will not be corroded only in alkaline solutions with a pH>11.5. In the atmospheric environment, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D177/00C09D5/10C23F13/14
Inventor 左禹李黎卢向雨赵旭辉唐鋆磊
Owner BEIJING UNIV OF CHEM TECH
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