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Nano self-assembly penetrant for magnesium alloy service and preparation method and application thereof

A nano-self-assembly and penetrating agent technology, applied in anodic oxidation, phosphating, etc., can solve problems such as effective protection of difficult magnesium alloy substrates, peeling off of composite coatings, corrosion, etc., to improve overall protection performance and bonding performance, and prolong service life Lifespan, the effect of accelerating the hydrolysis reaction

Inactive Publication Date: 2013-05-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the structural defects of loose micropores in the two coatings, they cannot be used alone as a surface treatment technology for magnesium alloys. Even if they are combined with some simple coating processes to form a composite coating, it is difficult to form an effective coating for the magnesium alloy substrate. This is due to: First, the elastic modulus and linear expansion coefficient of general coating materials are quite different from those of the oxide film (or phosphating film), which cannot form a good match, which is easy to form a relatively small coating inside the coating. large microdefects
Once this magnesium alloy composite coating is used in the actual corrosive environment, the corrosive medium can easily reach the surface of the magnesium substrate through the micro-defects of these coatings and micro-arc oxidation (or phosphating film), causing corrosion to occur, resulting in composite coatings. layer bubbling and failure; second, the general coating and the micro-arc oxidation ceramic layer (or phosphating film) are only a simple physical combination, and the bonding force is very limited. If it is subjected to external forces during actual service, it is easy to Causes spalling and cracking of composite coatings

Method used

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  • Nano self-assembly penetrant for magnesium alloy service and preparation method and application thereof
  • Nano self-assembly penetrant for magnesium alloy service and preparation method and application thereof
  • Nano self-assembly penetrant for magnesium alloy service and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Configuration of silane mixture. Mix and stir the silane KH-560 and TEOS at a molar ratio of n(KH560):n(TEOS)=3:1 to obtain a silane mixture.

[0032] 2. Configuration of hydrolysis catalyst. Acetic acid and phytic acid are uniformly mixed in a molar ratio of n (acetic acid):n (phytic acid) to 2:1 to obtain a hydrolysis catalyst.

[0033] 3. Co-solvent configuration. The co-solvent is propanol.

[0034] 4. Configuration of hydrolysis reaction. At room temperature, mix the silane mixed solution, hydrolysis catalyst, co-solvent and deionized water according to the following parts by weight, continue to stir, and hydrolyze for 3 to 4 days until the mixed solution is clear, then age it for later use to obtain liquid A.

[0035]

[0036] 5. Configuration of curing agent. The curing agent is triethylenetetramine (TETA), and TETA is made into a 10mol / L aqueous solution to obtain liquid B.

[0037] 6. Configuration of cross-linking reaction. At room temperature, ad...

Embodiment 2

[0042] 1. Configuration of silane mixture. Silane KH-560, Si69 and TEOS were mixed and stirred at a molar ratio of n(KH560):n(Si69):n(TEOS)=1.5:1.1:1 to obtain a silane mixture.

[0043] 2. Configuration of hydrolysis catalyst. Acetic acid and phytic acid are uniformly mixed in a molar ratio of n(acetic acid):n(phytic acid)=1.5:0.4 to obtain a hydrolysis catalyst.

[0044] 3. Co-solvent configuration. Co-solvent is selected ethanol.

[0045] 4. Configuration of hydrolysis reaction. At room temperature, mix the silane mixed solution, hydrolysis catalyst, co-solvent and deionized water according to the following parts by weight, continue to stir, and hydrolyze for 3 to 4 days until the mixed solution is clear, then age it for later use to obtain liquid A.

[0046]

[0047] 5. Configuration of curing agent. Diethylenetriamine (DETA) was selected as the curing agent, and DETA was formulated into a 10mol / L aqueous solution to obtain liquid B.

[0048] 6. Configuration of c...

Embodiment 3

[0053] 1. Configuration of silane mixture. Mix and stir the silane KH-560 and TEOS at a molar ratio of n(KH560):n(TEOS)=2:0.8 to obtain a silane mixture.

[0054] 2. Configuration of hydrolysis catalyst. Acetic acid and phytic acid are uniformly mixed in a molar ratio of n(acetic acid):n(phytic acid)=2.4:1.2 to obtain a hydrolysis catalyst.

[0055] 3. Co-solvent configuration. Co-solvent is selected ethanol.

[0056] 4. Configuration of hydrolysis reaction. At room temperature, mix the silane mixed solution, hydrolysis catalyst, co-solvent and deionized water according to the following parts by weight, continue to stir, and hydrolyze for 3 to 4 days until the mixed solution is clear, then age it for later use to obtain liquid A.

[0057]

[0058] 5. Configuration of curing agent. The curing agent is triethylenetetramine (TETA), and TETA is made into a 10mol / L aqueous solution to obtain liquid B.

[0059] 6. Configuration of cross-linking reaction. At room temperatur...

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Abstract

The present invention discloses a nano self-assembly penetrant for magnesium alloy service and a preparation method and application thereof, and belongs to magnesium alloy surface treatment technology. The preparation of nano-assembly penetrant includes hydrolysis and crosslinking reactions. The hydrolysis process includes: mixing a silane mixture, a hydrolysis catalyst, a cosolvent and deionized water, hydrolyzing for 3-4 days until the mixture is clarified, and aging for standby; and the cross-linking process includes: preparing an aliphatic amine curing agent into a solution of 10 mol / L, and adding the solution to the hydrolyzate to make the pH of the mixture is of 5.5-6.5 to obtain a nano self-assembly penetrant. The penetrant can form a good chemical match on magnesium alloy micro-arc oxidation ceramic coating or phosphate coating surface pores and defects, also form a good chemical bond connection with subsequent paint coatings, and can effectively improve overall protection performance and combination performance of a magnesium alloy micro-arc oxidation ceramic coating or a phosphate composite coating.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and in particular relates to a nanometer self-assembled penetrant for magnesium alloy service and its preparation method and application. Background technique [0002] Magnesium alloy is one of the lightest metal structural materials at present. It has many advantages such as high specific strength and specific stiffness, good shock absorption, thermal conductivity, electromagnetic shielding, machining performance and reprocessing and recycling characteristics. However, so far, there is still a huge contrast between its application potential and reality. This is due to the fact that magnesium is an extremely active metal with a standard electrode potential of -2.36V (vs. SCE), and its potential in common media is also very low. . Therefore, when magnesium alloys are used in actual corrosive environments, their surfaces must be treated, which puts forward higher requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/81C25D11/02C25D11/36
Inventor 杜克勤郭兴华王艳秋邵亚薇
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI