Preparation method of silane-cerium oxide-hydrotalcite composite coating on surface of magnesium/magnesium alloy matrix

A composite coating, magnesium alloy technology, applied in the direction of metal material coating process, coating, superimposed layer plating, etc. Insufficient grinding and other problems, to achieve the effect of simple and easy-to-control process, inhibiting anode reaction, and reducing the degree of defects

Active Publication Date: 2017-08-18
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, on the one hand, the existence of cracks restricts the full play of the corrosion resistance of organosilicon sol-gel coatings to a certain extent; Thin, and due to the inherent lack of wear resistance (scratch resistance) of the silicone coating, it cannot be compared with the inorganic coating, and the thickness is too thin and it is easy to be physically damaged
Therefore, this has caused the complexity of the control of the silicone sol-gel coating preparation process
[0010] It is not difficult to see that the common disadvantage of the hydrotalcite coating and organosilicon sol-gel coating technology in the prior art is that the corrosion resistance cannot reach a relatively ideal level, and the service life of the coating is average. short

Method used

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  • Preparation method of silane-cerium oxide-hydrotalcite composite coating on surface of magnesium/magnesium alloy matrix
  • Preparation method of silane-cerium oxide-hydrotalcite composite coating on surface of magnesium/magnesium alloy matrix
  • Preparation method of silane-cerium oxide-hydrotalcite composite coating on surface of magnesium/magnesium alloy matrix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The base material is magnesium alloy AZ31, and the preparation method is as follows:

[0074] The first step, preparation of hydrotalcite precursor

[0075] 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;

[0076] 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, stirred and dissolved, made into a mixed solution A, and heated the mixed solution A in a water bath at 50-80°C until the temperature of the mixed solution A in the three-necked flask no longer changes;

[0077] Place the NaOH taken in a container, add deionized water to dissolve, and prepare a NaOH solution with a molar concentration of 0.8M; then, add the NaOH taken 2 CO 3 , stir and dissolve, and prepare mixed solution B;

[0078] Add the above-mentioned mixed solution B to the above-mentioned thr...

Embodiment 2

[0095] The base material is magnesium alloy AZ91D, and the rest are the same as in Example 1.

Embodiment 3

[0097] The base material is pure magnesium, and the rest are the same as in Example 1.

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Abstract

The invention discloses a preparation method of a silane-cerium oxide-hydrotalcite composite coating on the surface of a magnesium/magnesium alloy matrix. The preparation method comprises four steps, including preparation of a hydrotalcite precursor, pretreatment of magnesium alloy, preparation of a hydrotalcite coating and preparation of a composite coating; and main chemical raw materials adopted in the preparation method include absolute ethyl alcohol, a silane coupling agent, ultrapure water and cerium salt, wherein the cerium salt is water-soluble salt. The technical route of the preparation method comprises the following steps: firstly depositing a layer of a hydrotalcite film (the chemical ingredient is Mg6Al2(OH)16CO3.4H2O) on the surface of the magnesium or magnesium alloy matrix by adopting a hydro-thermal synthesis method; and subsequently soaking a sample into a mixed solution of the silane coupling agent and the cerium salt so as to accomplish the preparation of the composite coating. The preparation method disclosed by the invention has the technical characteristics that the process is environmentally friendly and controlled simply and easily; the prepared composite coating is compact in structure, high in adhesive force, good in corrosion resistance and long in service life, and the like; and the composite coating is especially applicable to preservative treatment of a material applied to a magnesium alloy structure of maritime machinery equipment.

Description

technical field [0001] The invention relates to a preparation method of a magnesium / magnesium alloy substrate surface coating, in particular to a preparation method of a silane-cerium oxide-hydrotalcite composite coating on the magnesium / magnesium alloy substrate surface. Background technique [0002] Magnesium alloy is a good lightweight structural material, which has excellent physical and mechanical properties such as light weight, high specific strength, and impact resistance. It can be widely used in aerospace, energy industry, chemical industry, automobile, medical and health and other fields. However, metal magnesium is chemically active (strong reducing agent), and cannot form a passivation layer on the surface after oxidation like aluminum. Therefore, its poor corrosion resistance greatly limits its practical application. Therefore, it must undergo effective anti-corrosion treatment before use. [0003] In the prior art, surface coating treatment is one of the mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/04C23C18/12
CPCC23C18/1216C23C18/1254C23C28/04
Inventor 张芬姚青松曾荣昌张昌磊郭莲宋亮
Owner SHANDONG UNIV OF SCI & TECH
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