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A treatment liquid, preparation method and process for improving magnesium alloy surface anticorrosion

A technology of anti-corrosion treatment and treatment liquid, which is applied in anti-corrosion coatings, coatings, etc., can solve problems such as corrosion between magnesium alloy processing procedures, and achieve strong operability

Inactive Publication Date: 2011-11-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of corrosion between magnesium alloy processing procedures in machining workshops, and through the invented antirust liquid and operation method, the process technology that can conveniently carry out anticorrosion treatment on the surface of magnesium alloy online

Method used

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  • A treatment liquid, preparation method and process for improving magnesium alloy surface anticorrosion
  • A treatment liquid, preparation method and process for improving magnesium alloy surface anticorrosion
  • A treatment liquid, preparation method and process for improving magnesium alloy surface anticorrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Select a deformed AZ31 magnesium alloy with a size of 70 mm×35mm×1mm.

[0034] The specific steps are:

[0035] (1) Anticorrosive solution configuration: KH550: Deionized water: Ce(NO3) 3 10: 89.9: 0.1, change

[0036] The above-mentioned three-component substances are configured and stirred in proportions, and then stand still and prevent them from being hydrolyzed.

[0037] (2) Sample pretreatment: alkaline washing and degreasing → deionized water washing.

[0038] (3) Anti-corrosion treatment: Put the cleaned test piece into the anti-corrosion solution for 1 minute, take it out and bake it in an oven at 120°C for 30 minutes, and then leave it at room temperature.

[0039] The sample after the above treatment and the untreated sample are tested by electrode polarization, and the self-corrosion current density of the former is 1.28e -6 A / cm 2 , The latter is 6.772e -5 A / cm 2 , The polarization resistance of the anti-corrosion treatment and untreated parts are: 8.83e 4 Ω·cm 2 , 9....

Embodiment example 2

[0041] Select a deformed AZ31 magnesium alloy with a size of 70 mm×35mm×1mm

[0042] The specific steps are:

[0043] (1) Anti-corrosion solution configuration: KH460: deionized water volume ratio is 8:92. Put KH460 silane into deionized water in proportion to stir evenly and place to hydrolyze.

[0044] (2) Anti-corrosion treatment: polish the processed test piece with sandpaper to remove the oil, wipe it clean and put it in an anti-corrosion solution for 30 seconds, take it out, and bake it in an oven at 100°C for 30 minutes, and leave it at room temperature after taking it out.

[0045] (3) The samples after the above treatment and the untreated samples have undergone accelerated damp heat experiment, at a temperature of 60℃, humidity> After 17 days of continuous experiments in 80% of the constant temperature water bath, it was found that the surface of the treated sample did not have any corrosion spots, while the untreated sample had many corrosion spots on the surface after the s...

Embodiment example 3

[0047] Select a deformed AZ31 magnesium alloy with a size of 70 mm×35mm×1mm

[0048] The specific steps are:

[0049] (1) Anticorrosive liquid configuration: KH69:H 2 O:CH 3 CH 2 OH=2:2:96, put KH69 silane into deionized water and ethanol solution according to the proportion, stir evenly, and place to hydrolyze.

[0050] (2) Anti-corrosion treatment: polish the processed test piece with sandpaper to remove oil, wipe it clean, soak it in anti-corrosion solution for 1 minute, take it out and dry it.

[0051] Put the bare magnesium alloy and the anticorrosive magnesium alloy sample into a 5% NaCl solution to accelerate the immersion for 5 hours. It can be found that the bare magnesium sample has a large area of ​​corrosion, while the treated sample has only a small amount of corrosion (see image 3 ).

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Abstract

A treatment solution, preparation method and process for improving surface corrosion resistance of magnesium alloys, used for surface protection of various magnesium alloys during short machining intervals, the treatment solution contains silane coupling agent, rare earth salt, corrosion inhibitor, ethanol , Combination of two or more components in deionized water, the main ratio is: silane 2%-15%, deionized water or ethanol 85%-98%; or silane 4%-12%, ethanol 4%-10% %, 80%-90% of deionized water; the total amount of other additives <1%. The treatment solution is simple and easy to operate. The thickness of the treated film is less than 2 microns, and it can resist the environment with a temperature higher than 50°C and a humidity higher than 80% for no less than 15 days, that is, the treated magnesium alloy has no corrosion marks on the surface for 15 days in a high-heat and high-humidity environment. The anti-corrosion film layer of the present invention has the following characteristics: 1) excellent bonding force with the alloy substrate; 2) good resistance to high temperature and high humidity; 3) does not affect the subsequent processing and surface coating of the workpiece.

Description

technical field [0001] The invention relates to a surface anticorrosion protection treatment technology between magnesium alloy processing procedures, which is used to prevent corrosion in high-temperature and high-humidity environments between magnesium alloy processing procedures, can replace antirust oil treatment, and avoid affecting subsequent processing or reducing the bonding force of coatings. Background technique [0002] 1) Corrosion of magnesium alloys [0003] Magnesium alloy is a metal material with extremely low electrode potential (often used as sacrificial anode material), non-dense oxide film on the surface (PB value is less than 1), and negative difference effect, so its corrosion resistance is extremely low compared to other metal structural materials. Difference. Usually, the surface of magnesium alloy workpieces must be protected before they leave the factory and sold. The most commonly used ones are surface passivation, phosphating or anodic oxidation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D183/00
Inventor 张津朱阮利吴超云郑国梁
Owner UNIV OF SCI & TECH BEIJING
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