Preparation method of organosilicon sol-gel coating for magnesium alloy substrate surface corrosion resistance

An organosilicon sol, magnesium alloy technology, applied in anti-corrosion coatings, metal material coating processes, coatings, etc., can solve problems affecting the corrosion resistance of organosilicon sol-gel coatings, and achieve high catalytic hydrolysis capacity, Good anti-corrosion effect and improved anti-corrosion performance

Inactive Publication Date: 2013-08-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the magnesium alloy substrate, due to the high reactivity of the magnesium alloy in an acidic environment, hydrogen evolution reaction is prone to occur, thus affecting the corrosion resistance of the silicone sol-gel coating on its surface

Method used

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  • Preparation method of organosilicon sol-gel coating for magnesium alloy substrate surface corrosion resistance
  • Preparation method of organosilicon sol-gel coating for magnesium alloy substrate surface corrosion resistance
  • Preparation method of organosilicon sol-gel coating for magnesium alloy substrate surface corrosion resistance

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In this embodiment, the magnesium alloy substrate is exactly the same as the above-mentioned Comparative Example 1, and an anti-corrosion organic silicon sol-gel coating is prepared on the surface of the magnesium alloy substrate. base silane as precursor, using Ce(NO 3 ) 3 It is obtained by carrying out a hydrolysis-condensation reaction with a catalyst, and the specific steps are as follows:

[0034] (1) Mix 3.75g of mercaptopropyltrimethoxysilane, 1.25g of tetraethoxysilane, 20g of ethanol, and 5g of 0.1% Ce (NO 3 ) 3The solution was mixed evenly, and stirred at room temperature for 12 hours to obtain an alkoxysilane hydrolyzate;

[0035] (2) After the magnesium alloy AZ91 is mechanically polished and ultrasonically cleaned, it is soaked in the above-mentioned alkoxysilane hydrolyzate for 1 minute. After taking it out, it is heat-treated at 120°C for 30 minutes. After drying, the surface is covered with organic silicon sol-gel Coating implemented on AZ91 samples....

Embodiment 2

[0053] In this embodiment, the magnesium alloy substrate is exactly the same as the above-mentioned comparative example 2, and an anti-corrosion organic silicon sol-gel coating is prepared on the surface of the magnesium alloy substrate, and the coating is made of methyltrimethoxysilane and tetraethoxysilane Silane as the precursor, using La(NO 3 ) 3 It is obtained as a hydrolysis reaction catalyst for hydrolysis-condensation reaction, and the specific steps are as follows:

[0054] (1) Mix 8.16g methyltrimethoxysilane, 4.16g tetraethoxysilane, 7.02g ethanol, and 7.02g0.1%La (NO 3 ) 3 The solution was mixed evenly, and stirred at 40° C. for 6 hours to obtain an alkoxysilane hydrolyzate;

[0055] (2) After the AZ31 magnesium alloy is mechanically polished and ultrasonically cleaned, it is soaked in alkoxysilane hydrolyzate for 1 minute, and after taking it out, it is heat treated at 100 ° C for 1 hour. After drying, the surface is covered with organic silicon sol-gel coating...

Embodiment 3

[0072] In this embodiment, the magnesium alloy substrate is exactly the same as the above-mentioned comparative example 3, and an anti-corrosion organic silicon sol-gel coating is prepared on the surface of the magnesium alloy substrate. The coating uses methyltrimethoxysilane as a precursor, and adopts Ce (NO 3 ) 3 It is obtained as a hydrolysis reaction catalyst for hydrolysis-condensation reaction, and the specific steps are as follows:

[0073] (1) Add 6g of methyltrimethoxysilane, 21g of ethanol, and 3g of 0.1% La (NO 3 ) 3 The solution was mixed evenly, and stirred at 60°C for 2 hours to obtain an alkoxysilane hydrolyzate;

[0074] (2) After the JDM2 magnesium alloy is mechanically polished and ultrasonically cleaned, it is soaked in alkoxysilane hydrolyzate for 1 minute. After taking it out, it is heat treated at 80°C for 90 minutes. After drying, the surface is covered with organic silicon sol-gel coating. Layer implementation of the JDM2 sample.

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Abstract

The present invention provides a preparation method of an organosilicon sol-gel coating for magnesium alloy substrate surface corrosion resistance. According to the preparation method, alkoxy silane is adopted as a precursor, a salt compound of a metal cerium and / or a salt compound of a metal lanthanum is adopted as a catalyst, and a hydrolysis-condensation reaction is performed to obtain an organosilicon sol-gel coating. Experiment results confirm that: compared with conventional acid catalysts, the catalyst of the present invention provides high catalytic hydrolysis capability on alkoxy silane, and has a metal corrosion slowing effect, such that the organosilicon sol-gel coating prepared by using the catalyst can provide a good corrosion resistance effect for magnesium alloys compared with the organosilicon sol-gel coating prepared by using the conventional acid catalyisi.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for preparing an organic silicon sol-gel coating for anticorrosion on the surface of a magnesium alloy substrate. Background technique [0002] Magnesium alloy tools are known for their low density and are considered to be excellent substitutes for aluminum alloys and non-ferrous metals in the automotive industry and other fields. However, the chemical properties of magnesium alloys are active, unlike aluminum alloys, which can form a dense passivation layer on the surface, so their corrosion resistance is very poor, which greatly limits their practical applications. [0003] In order to improve the service life of magnesium alloys, methods such as preparing coatings on the surface of magnesium alloy substrates and performing micro-arc oxidation on magnesium alloy substrates are often used for protection. In recent years, organosilica sol-gel coatings ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D5/08C08G77/08C23C26/00
Inventor 彭叔森乌学东曾志翔彭立明曹慧军吴斌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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