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Preparation method of magnesium/magnesium alloy hydrotalcite-aluminum oxide composite coating

A composite coating and magnesium alloy technology, which is applied in the coating process of metal materials, coating, superimposed layer plating, etc., can solve the problems of poor corrosion resistance of hydrotalcite porous layer, short service life of magnesium/magnesium alloy, etc. Achieve excellent surface coverage, simple and easy-to-control preparation process, and strong adhesion

Inactive Publication Date: 2018-12-18
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of short service time of magnesium / magnesium alloys and poor corrosion resistance of the hydrotalcite porous layer, which cannot meet people's needs, the invention provides a method for preparing a hydrotalcite-alumina composite coating of magnesium / magnesium alloys

Method used

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  • Preparation method of magnesium/magnesium alloy hydrotalcite-aluminum oxide composite coating
  • Preparation method of magnesium/magnesium alloy hydrotalcite-aluminum oxide composite coating
  • Preparation method of magnesium/magnesium alloy hydrotalcite-aluminum oxide composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare LDH coating on magnesium alloy by hydrothermal method, the specific steps are:

[0048] (1) Mechanically polish the AZ31 substrate with 150#, 400#, 800#, 1200#, and 1500# water-grinding sandpaper in sequence, then wash it with 1mol / L sodium hydroxide solution and deionized water, and dry it with nitrogen to remove surface oxidation substances and impurities;

[0049] (2) Precursor preparation

[0050] According to the molar ratio of 3:1:8:2, weigh Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, NaOH and Na 2 CO 3 ,spare;

[0051] The taken Mg(NO 3 ) 2 ·6H 2 O was placed in a three-necked flask, dissolved in deionized water, and prepared into Mg(NO 3 ) 2 ·6H 2 O solution; then, add the Al(NO 3 ) 3 9H 2 O, stirring and dissolving, made into mixed solution A, and heated the mixed solution A in a water bath at 65°C until the temperature of the mixed solution A in the flask no longer changes;

[0052] Place the NaOH taken in a container, add deionized wat...

Embodiment 2

[0065] Prepare LDH coating on magnesium alloy by hydrothermal method, the specific steps are:

[0066] (1) Mechanically polish the AZ31 substrate with 150#, 400#, 800#, 1200#, and 1500# water-grinding sandpaper in sequence, then wash it with 1mol / L sodium hydroxide solution and deionized water, and dry it with nitrogen to remove surface oxidation substances and impurities;

[0067] (2) Precursor preparation

[0068] According to the molar ratio of 3:1:8:2, weigh Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, NaOH and Na 2 CO 3 ,spare;

[0069] The taken Mg(NO 3 ) 2 ·6H 2 O was placed in a three-necked flask, dissolved in deionized water, and prepared into Mg(NO 3 ) 2 ·6H 2 O solution; then, add the Al(NO 3 ) 3 9H 2 O, stirring and dissolving, made into mixed solution A, and heated the mixed solution A in a water bath at 65°C until the temperature of the mixed solution A in the flask no longer changes;

[0070] Place the NaOH taken in a container, add deionized wat...

Embodiment 3

[0084] Prepare LDH coating on magnesium alloy by hydrothermal method, the specific steps are:

[0085] (1) Mechanically polish the AZ31 substrate with 150#, 400#, 800#, 1200#, and 1500# water-grinding sandpaper in sequence, then wash it with 1mol / L sodium hydroxide solution and deionized water, and dry it with nitrogen to remove surface oxidation substances and impurities;

[0086] (2) Precursor preparation

[0087] According to the molar ratio of 3:1:8:2, weigh Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, NaOH and Na 2 CO 3 ,spare;

[0088] The taken Mg(NO 3 ) 2 ·6H 2 O was placed in a three-necked flask, dissolved in deionized water, and prepared into Mg(NO 3 ) 2 ·6H 2 O solution; then, add the Al(NO 3 ) 3 9H 2 O, stirring and dissolving, made into mixed solution A, and heated the mixed solution A in a water bath at 65°C until the temperature of the mixed solution A in the flask no longer changes;

[0089] Place the NaOH taken in a container, add deionized wat...

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Abstract

The invention provides a preparation method of a magnesium / magnesium alloy hydrotalcite-aluminum oxide composite coating. The preparation method comprises the four steps including pretreatment of a magnesium alloy, preparation of a hydrotalcite coating, pretreatment of the hydrotalcite coating and atomic layer deposition of an aluminum oxide layer. The main chemical raw materials include aluminumnitrate, magnesium nitrate, sodium carbonate, sodium hydroxide, trimethyl aluminum and ultrapure water. The technical route is characterized in that a hydrothermal method is adopted to synthesize a carbonate hydrotalcite film on the surface of a magnesium / magnesium alloy matrix; and then the aluminum oxide coating is deposited on the surface of the hydrotalcite by using an atomic layer depositiontechnique after surface activation. The invention has the advantages that simple preparation and easy control are achieved, and the obtained composite coating has the compact structure, strong adhesion and good corrosion resistance; and the composite material prepared is suitable for the protection of magnesium alloy materials for engineering equipment.

Description

technical field [0001] The invention relates to the technical field of coating preparation, in particular to a preparation method of a magnesium / magnesium alloy hydrotalcite-alumina composite coating. Background technique [0002] Magnesium and its alloys have the characteristics of light weight, high specific strength, and good shock resistance. They are a new generation of light metal structural materials and have broad application prospects in the fields of 3C products, automobiles, high-speed rail, and aerospace. However, the excessive corrosion rate of magnesium alloy is still the main factor limiting its application. The high activity of magnesium makes magnesium alloy structural parts prone to corrosion during use. If magnesium alloy components are connected with dissimilar metals, they are prone to galvanic corrosion. Therefore, developing an effective anti-corrosion coating and technology is an urgent problem to be solved in promoting the large-scale application o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/40C23C16/455C23C18/12C23C28/04
CPCC23C16/403C23C16/45525C23C18/1204C23C18/1241C23C18/1254C23C28/04
Inventor 曾荣昌于池张柏诚崔蓝月郭莲万军夏洋
Owner SHANDONG UNIV OF SCI & TECH
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