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Method for preparing corrosion-resistant hydrophobic membrane on surface of magnesium alloy

A magnesium alloy, corrosion-resistant technology, applied in the field of metal material surface treatment and metal anti-corrosion, can solve problems such as harmful effects, many process steps, and difficulty in large-scale production, achieving low production cost, simplified process, easy The effect of large-scale industrial production

Inactive Publication Date: 2017-05-10
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many process steps, it is not easy to produce on a large scale, and expensive fluorine-containing silane is used as a modification substance to reduce surface energy, which will have harmful effects on equipment and human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] AZ91D magnesium alloy sample is used.

[0023] A method for preparing a corrosion-resistant hydrophobic film on the surface of a magnesium alloy, comprising the following steps:

[0024] 1. Preparation of corrosion-resistant coating of magnesium alloy: After chemical degreasing and activation by pickling, the magnesium alloy is washed 4 times with ultrapure water. This is a known technology, so it will not be repeated.

[0025] The magnesium alloy is immersed in the zirconium / vanadate solution to form a zirconium / vanadate corrosion-resistant film on the surface of the magnesium alloy.

[0026] Magnesium alloy soaking treatment conditions are soaking in zirconium / vanadate solution at 40°C for 30 minutes, cleaning with ultrapure water, and drying.

[0027] 2. Hydrophobic treatment of the magnesium alloy: at room temperature, the magnesium alloy prepared in step 1 is placed in a low surface energy modification solution for modification, and then dried after modification....

Embodiment 2

[0037] AZ91D magnesium alloy sample is used.

[0038] A method for preparing a corrosion-resistant hydrophobic film on the surface of a magnesium alloy, comprising the following steps:

[0039] 1. Preparation of the magnesium alloy corrosion-resistant film layer: the magnesium alloy is chemically degreased, after pickling and activation, it is washed 5 times with ultrapure water, and the magnesium alloy is soaked in zirconium / vanadate solution to make the surface of the magnesium alloy form A corrosion-resistant coating of zirconium / vanadate.

[0040] Magnesium alloy soaking treatment conditions are soaking in 70°C zirconium / vanadate solution for 60 minutes, cleaning with ultrapure water, and drying.

[0041] 2. Hydrophobic treatment of the magnesium alloy: at room temperature, the magnesium alloy prepared in step 1 is placed in a low surface energy modification solution for modification, and then dried after modification.

[0042] After the above treatment, a treated film w...

Embodiment 3

[0049] MD8 magnesium alloy samples are used.

[0050] A method for preparing a corrosion-resistant hydrophobic film on the surface of a magnesium alloy, comprising the following steps:

[0051] 1. Preparation of the magnesium alloy corrosion-resistant film layer: the magnesium alloy is chemically degreased, pickled and activated, washed 4 times with ultrapure water, and the magnesium alloy is soaked in a zirconium / vanadate solution to form a magnesium alloy surface A corrosion-resistant coating of zirconium / vanadate.

[0052] Magnesium alloy soaking treatment conditions are soaking in zirconium / vanadate solution at 60°C for 120 minutes, cleaning with ultrapure water, and drying.

[0053] 2. Hydrophobic treatment of the magnesium alloy: at room temperature, the magnesium alloy prepared in step 1 is placed in a low surface energy modification solution for modification, and then dried after modification.

[0054] After the above treatment, a treated film with good corrosion res...

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Abstract

A method for preparing a corrosion-resistant hydrophobic membrane on the surface of magnesium alloy comprises the following two steps: preparing a corrosion-resistant membrane layer in a zirconium / vanadate solution; and carrying out hydrophobization treatment on the membrane layer by using low-energy surface modification liquid. The zirconium / vanadate solution is prepared by preparing basic liquid from potassium fluozirconate, sodium metavanadate and ultra-pure water, and adding one or more of sodium molybdate, ammonium molybdate, tannic acid, phytic acid or diphosphonic acid as additives. The low-energy surface modification liquid is an ethanol solution of one or more of dodecanoic acid, tridecylic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid or a KH560 silane coupling agent. In the method, etching treatment of acid or alkali etching liquid is not required, steps are simplified, corrosion to equipment is reduced, the corrosion-resistant hydrophobic membrane can be prepared by soaking only, and complicated steps such as electrifying or lifting are not required. The process is simple, the price is low, and meanwhile, the prepared hydrophobic membrane has certain corrosion resistance and self-cleaning property, and can be produced on a large scale.

Description

technical field [0001] The invention belongs to the field of metal material surface treatment and the field of metal anticorrosion, and specifically relates to a method for preparing a corrosion-resistant hydrophobic film on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy has a low density of only 1.3-1.9g / cm 3 , is 30% to 50% lighter than aluminum alloy, and about 70% lighter than steel. At the same time, magnesium alloy also has excellent performance characteristics such as specific stiffness, high specific strength, and easy cutting processing, making it widely used. Therefore, magnesium alloy is also known as "the most promising green engineering material in the 21st century". However, magnesium alloys are chemically active and the standard potential is relatively negative, so magnesium alloys are prone to corrosion, especially in humid environments. Therefore, only by cutting off the corrosion conditions of magnesium alloys from the roo...

Claims

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Application Information

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IPC IPC(8): C23C22/44C23C22/34C23C22/78C23C22/73
CPCC23C22/44C23C22/34C23C22/73C23C22/78
Inventor 郝建军代肇一
Owner SHENYANG LIGONG UNIV
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