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Modified magnesium-rich coating used for protection of magnesium alloy or aluminium alloy and preparation method of coating

A technology of magnesium-rich coatings and magnesium alloys, applied in anti-corrosion coatings, polyamide coatings, epoxy resin coatings, etc. Cost increase and other issues, to achieve the effect of improving protection performance, slowing down aging and degradation, and improving compactness

Inactive Publication Date: 2014-07-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The protective effect of magnesium-rich coatings on magnesium alloys has been confirmed (a magnesium alloy anti-corrosion coating and its preparation method, application number: CN200910084217.4), but there are still some shortcomings in magnesium-rich coatings: The activity of magnesium powder is very high. In the process of cathodic protection, magnesium powder has a strong sacrificial anode effect, which will generate a strong current effect, resulting in the degradation of organic matter in the coating and accelerated aging; the adhesion between the coating and the surface of the magnesium alloy is relatively weak. Poor; the price of magnesium powder is high, resulting in an increase in the cost of magnesium-rich coatings

Method used

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  • Modified magnesium-rich coating used for protection of magnesium alloy or aluminium alloy and preparation method of coating
  • Modified magnesium-rich coating used for protection of magnesium alloy or aluminium alloy and preparation method of coating
  • Modified magnesium-rich coating used for protection of magnesium alloy or aluminium alloy and preparation method of coating

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Experimental program
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Effect test

Embodiment 1

[0027] 1) Back up epoxy resin, polyamide, pure magnesium powder, zinc oxide, defoamer and silane coupling agent according to the following mass percentages respectively: 30%, 14%, 50%, 5%, 0.5% and 0.5%, the average particle size of the magnesium powder is 10-20 microns, and the particle size of zinc oxide is about 1 micron;

[0028] 2) epoxy resin is dissolved in the solvent that xylene and n-butanol are mixed in a certain proportion, and the mass fraction that is mixed with epoxy resin is the solution of 55%; Polyamide is dissolved in xylene and n-butanol in certain proportion In the mixed solvent, the mass fraction of polyamide is prepared into a solution of 55%;

[0029] 3) Add magnesium powder and zinc oxide to the epoxy resin solution prepared in step 2), mix evenly, add silane coupling agent, stir at a high speed of 1000r / min for 30 minutes, and then add in step 2) to prepare The polyamide solution and defoamer were stirred at a speed of 500r / min for 10 minutes to obta...

Embodiment 2

[0032] 1) Backup epoxy resin, polyamide, pure magnesium powder, zinc oxide, defoamer and silane coupling agent according to the following mass percentages respectively: 38%, 6%, 45%, 10%, 0.5% and 0.5%, the average particle size of the magnesium powder is 10-20 microns, and the particle size of zinc oxide is about 1 micron;

[0033] 2) epoxy resin is dissolved in the solvent that xylene and n-butanol are mixed in a certain proportion, and the mass fraction that is mixed with epoxy resin is the solution of 65%; Polyamide is dissolved in xylene and n-butanol in certain proportion In the mixed solvent, the mass fraction of polyamide is prepared into a solution of 65%;

[0034] 3) Add magnesium powder and zinc oxide to the epoxy resin solution prepared in step 2), mix evenly, add silane coupling agent, stir at a high speed of 1500r / min for 15 minutes, and then add in step 2) to prepare The polyamide solution and the defoamer were stirred at a speed of 800r / min for 8 minutes to ob...

Embodiment 3

[0037] 1) Backup epoxy resin, polyamide, pure magnesium powder, zinc oxide, defoamer and silane coupling agent according to the following mass percentages respectively: 30%, 9%, 40%, 20%, 0.5% and 0.5%, the average particle size of the magnesium powder is 10-20 microns, and the particle size of zinc oxide is about 1 micron;

[0038] 2) epoxy resin is dissolved in xylene and n-butanol in a solvent mixed in a certain proportion, and the mass fraction of epoxy resin is mixed with a solution of 75%; polyamide is dissolved in xylene and n-butanol in a certain proportion In the mixed solvent, the mass fraction of polyamide is prepared into a solution of 75%;

[0039]3) Add magnesium powder and zinc oxide to the epoxy resin solution prepared in step 2), mix evenly, add silane coupling agent, stir at a high speed of 3000r / min for 10 minutes, and then add in step 2) to prepare The polyamide solution and the defoamer were stirred at a speed of 1000r / min for 2 minutes to obtain a zinc o...

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Abstract

The invention relates to a modified magnesium-rich coating used for protection of a magnesium alloy or aluminium alloy and a preparation method of the coating and belongs to the field of metal corrosion and protection. A dry film of the modified magnesium-rich coating used for the protection of the magnesium alloy or aluminium alloy comprises the following components in percentage by mass: 30-40% of epoxy resin, 5-15% of polyamide, 40-50% of pure magnesium powder, 5-20% of zinc oxide, 0.5% of defoaming agent BYK-A530 and 0.5% of silane coupling agent. The preparation method of the modified magnesium-rich coating used for the protection of the magnesium alloy or aluminium alloy comprises the steps of respectively dissolving epoxy resin and polyamide in a mixed solvent formed by mixing dimethylbenzene with n-butyl alcohol in mass ratio of 7:3 to respectively prepare solutions with the mass fraction of 55-75%; adding magnesium powder and zinc oxide into an epoxy resin solution, uniformly mixing, then adding the silane coupling agent, and adding a polyamide solution and the defoaming agent while stirring, so that the zinc oxide modified magnesium-rich coating is obtained. Adhesive strength and protective effect of the modified magnesium-rich coating provided by the invention to the magnesium alloy are obviously higher than those of general magnesium-rich coating, and a preparation technology is simple.

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. technical background [0002] As magnesium alloys are widely used in transportation, information and other fields, they are known as "green engineering materials in the 21st century". But magnesium alloys are extremely electrochemically active, making them unsuitable for most corrosive environments. Therefore, proper surface treatment to improve its corrosion resistance is of great practical significance to give full play to the performance advantages of magnesium alloys. Therefore, proper surface treatment to improve its corrosion resistance is of great practical significance to give full play to the performance advantages of magnesium alloys. [0003] Applying a coating is one of the most widely used corrosion protection methods on metals. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D177/00C09D5/10
Inventor 左禹沈上圯赵旭辉唐聿明
Owner BEIJING UNIV OF CHEM TECH