阅读说明：本技术 一种镁合金表面防腐处理工艺 (Magnesium alloy surface anticorrosion treatment process ) 是由 杨霞 刘吉梓 赵磊 于 2021-10-18 设计创作，主要内容包括：一种镁合金表面防腐处理工艺,包括如下步骤,打磨抛光、化学除油、水清洗、喷砂处理、水清洗、升温除去镁合金样体表面脏污及氧化膜、冷却后化学活化处理,最后烘烤后即可得到。本发明具有处理难度低,工艺条件温和,操作方便等优点,采用打磨抛光、化学除油和喷砂的方法对镁合金样体的表面进行预处理,能有有效出去镁合金样体表面的有机附着物,为后续的化学活性处理提供了条件。本发明能有效的控制镁合金表面的腐蚀,提高了镁合金的使用性能,延长其了使用寿命。(A magnesium alloy surface anticorrosion treatment process comprises the following steps of polishing, chemical oil removal, water cleaning, sand blasting, water cleaning, heating to remove stains and oxide films on the surface of a magnesium alloy sample body, cooling, chemical activation treatment, and baking. The method has the advantages of low treatment difficulty, mild process conditions, convenient operation and the like, and can effectively remove organic attachments on the surface of the magnesium alloy sample body by adopting the methods of polishing, chemical oil removal and sand blasting to pretreat the surface of the magnesium alloy sample body, thereby providing conditions for subsequent chemical activity treatment. The invention can effectively control the corrosion of the surface of the magnesium alloy, improve the service performance of the magnesium alloy and prolong the service life of the magnesium alloy.)

1. The magnesium alloy surface anticorrosion treatment process is characterized by comprising the following steps:

(1) grinding and polishing the surface of the magnesium alloy, and then soaking a magnesium alloy sample body in 60-80 ℃ alkali liquor for 5-10 minutes to carry out chemical oil removal treatment;

(2) washing the magnesium alloy sample obtained in the step (1) with water at room temperature;

(3) heating the magnesium alloy sample body obtained in the step (2) to 110 ℃ of 100-;

(4) putting the magnesium alloy sample obtained in the step (3) into hot water at the temperature of 70-80 ℃ for cleaning for 3-5 minutes;

(5) putting the magnesium alloy sample obtained in the step (4) into room temperature, and washing with water for 2-3 minutes;

(6) putting the magnesium alloy sample body subjected to the step (5) into a hydrochloric acid solution at room temperature, and etching for 10-30 s to remove surface dirt and an oxide film;

(7) putting the magnesium alloy sample obtained in the step (6) into a cold water tank, and washing for 3-5 minutes in a vibration mode;

(8) immersing the magnesium alloy sample body in hydrofluoric acid aqueous solution with the mass percentage concentration of 1-3% for 3-5s, and carrying out chemical activation treatment;

(9) and (4) putting the magnesium alloy sample obtained in the step (8) into an oven to bake for 2-3 hours to obtain the magnesium alloy material.

2. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: and (2) soaking the magnesium alloy sample body in alkali liquor at 70 ℃ for 5 minutes in the step (1).

3. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: the alkaline washing solution in the step (1) is an aqueous solution containing 40-50 g/LNaOH and 10-15 g/LNa3PO4 & 12H 2O.

4. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: and (3) heating the magnesium alloy sample body to 100 ℃, and then performing sand blasting treatment by using carborundum with the particle size of 100-150 meshes, wherein the sand blasting air pressure is controlled at 0.5 MPa.

5. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: and (4) cleaning the magnesium alloy sample body at 70 ℃ for 3 minutes.

6. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: and (5) flushing the magnesium alloy sample body for 2 minutes.

7. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: the etching time in the step (6) is 20 s.

8. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: the hydrochloric acid solution in the step (6) is phosphoric acid and phosphate solution with the concentration of 32-35%, and the prepared molar ratio is 1: 1-1.5.

9. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: and (5) in the step (7), the vibration cleaning time of the magnesium alloy sample body is 3 minutes.

10. The magnesium alloy surface anticorrosion treatment process according to claim 1, characterized in that: and (3) chemically activating the magnesium alloy sample in the step (8) for 3 s.

Technical Field

The invention relates to the technical field of metal material surface treatment, in particular to a magnesium alloy surface anticorrosion treatment process.

Background

Currently, magnesium alloys are mainly used in the aviation, aerospace, transportation, chemical, rocket and other industries, and are among the most lightweight metals in practical use, magnesium having a specific gravity of about 2/3 for aluminum and 1/4 for iron. Although the high-strength and high-rigidity magnesium alloy has a higher specific gravity than plastic, the magnesium alloy has a higher strength and a higher modulus of elasticity per unit weight than plastic, and therefore, the magnesium alloy can be made thinner and lighter than plastic for the same strength component. Further, since magnesium alloys also have higher specific strength than aluminum alloys and iron, parts made of aluminum or iron can be reduced in weight without reducing the strength of the parts. The magnesium alloy has the highest relative strength (strength to mass ratio). The specific rigidity (rigidity to mass ratio) is close to that of aluminum alloy and steel and is far higher than that of engineering plastics. In the elastic range, when the magnesium alloy is subjected to impact load, the absorbed energy is half more than that of an aluminum alloy part, so that the magnesium alloy has good shock resistance and noise reduction performance.

However, although magnesium alloy has many excellent properties, due to its extremely high chemical and electrochemical activity, a thin oxide film which is easily oxidized, loose and has poor protection capability is naturally generated on the surface of magnesium alloy in air or solution, which causes the magnesium alloy to be easily severely corroded in humid atmosphere, soil and seawater, shortens the service life of products made of magnesium alloy, and prevents the wide application of magnesium alloy.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a magnesium alloy surface anticorrosion treatment process which can effectively realize an anticorrosion effect and reduce environmental pollution, and the specific scheme is as follows:

the invention relates to a magnesium alloy surface anticorrosion treatment process which is characterized by comprising the following steps:

(1) grinding and polishing the surface of the magnesium alloy, and then soaking a magnesium alloy sample body in 60-80 ℃ alkali liquor for 5-10 minutes to carry out chemical oil removal treatment;

(2) washing the magnesium alloy sample obtained in the step (1) with water at room temperature;

(3) heating the magnesium alloy sample body obtained in the step (2) to 110 ℃ of 100-;

(4) putting the magnesium alloy sample obtained in the step (3) into hot water at the temperature of 70-80 ℃ for cleaning for 3-5 minutes;

(5) putting the magnesium alloy sample obtained in the step (4) into room temperature, and washing with water for 2-3 minutes;

(6) putting the magnesium alloy sample body subjected to the step (5) into a hydrochloric acid solution at room temperature, and etching for 10-30 s to remove surface dirt and an oxide film;

(7) putting the magnesium alloy sample obtained in the step (6) into a cold water tank, and washing for 3-5 minutes in a vibration mode;

(8) immersing the magnesium alloy sample body in hydrofluoric acid aqueous solution with the mass percentage concentration of 1-3% for 3-5s, and carrying out chemical activation treatment;

(9) and (4) putting the magnesium alloy sample obtained in the step (8) into an oven to bake for 2-3 hours to obtain the magnesium alloy material.

In the technical scheme of the magnesium alloy surface anticorrosion treatment process, the further preferable technical scheme is characterized in that:

1. soaking the magnesium alloy sample body in the step (1) in alkali liquor at 70 ℃ for 5 minutes;

2. treating the chemical oil removal treatment in the step (1) by using an alkaline solution, wherein the alkaline solution is an aqueous solution containing 40-50 g/LNaOH and 10-15 g/LNa3PO4 & 12H 2O;

3. heating the magnesium alloy sample body in the step (3) to 100 ℃, and then performing sand blasting treatment by using carborundum with the particle size of 100-;

4. in the step (4), the cleaning temperature of the magnesium alloy sample body is 70 ℃, and the cleaning time is 3 minutes;

5. the washing time of the magnesium alloy sample in the step (5) is 2 minutes;

6. the etching time in the step (6) is 20 s;

7. the hydrochloric acid solution in the step (6) is phosphoric acid and phosphate solution with the concentration of 32-35%, and the prepared molar ratio is 1: 1-1.5;

8. in the step (7), the vibration cleaning time of the magnesium alloy sample body is 3 minutes;

9. and (3) chemically activating the magnesium alloy sample in the step (8) for 3 s.

Compared with the prior art, the method has the advantages of low treatment difficulty, mild process conditions, convenient operation and the like, and the method adopts the methods of polishing, chemical oil removal and sand blasting to pretreat the surface of the magnesium alloy sample body, can effectively remove organic attachments on the surface of the magnesium alloy sample body, and provides conditions for subsequent chemical activity treatment. The invention can effectively control the corrosion of the surface of the magnesium alloy, improve the service performance of the magnesium alloy and prolong the service life of the magnesium alloy.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Embodiment 1, a magnesium alloy surface anticorrosion treatment process, includes the following steps: (1) grinding and polishing the surface of the magnesium alloy, and then soaking a magnesium alloy sample body in 60-80 ℃ alkali liquor for 5-10 minutes to carry out chemical oil removal treatment; (2) washing the magnesium alloy sample obtained in the step (1) with water at room temperature; (3) heating the magnesium alloy sample body obtained in the step (2) to 110 ℃ of 100-; the method of polishing, degreasing and sand blasting is used for pretreating the surface of the magnesium alloy, so that organic attachments on the surface of the magnesium alloy can be effectively removed, and conditions are provided for subsequent surface treatment and coating of a coating; (4) putting the magnesium alloy sample obtained in the step (3) into hot water at the temperature of 70-80 ℃ for cleaning for 3-5 minutes; (5) putting the magnesium alloy sample obtained in the step (4) into room temperature, and washing with water for 2-3 minutes; (6) putting the magnesium alloy sample body subjected to the step (5) into a hydrochloric acid solution at room temperature, and etching for 10-30 s to remove surface dirt and an oxide film; (7) putting the magnesium alloy sample obtained in the step (6) into a cold water tank, and washing for 3-5 minutes in a vibration mode; (8) immersing the magnesium alloy sample body in hydrofluoric acid aqueous solution with the mass percentage concentration of 1-3% for 3-5s, and carrying out chemical activation treatment; (9) and (4) putting the magnesium alloy sample obtained in the step (8) into an oven to bake for 2-3 hours to obtain the magnesium alloy material. The steps (1) - (3) are pretreatment processes, and the oxide film layer attached to the surface of the magnesium alloy is completely removed, so that the method lays a foundation for subsequent steps and the like and creates conditions for chemical activation. And (5) putting the magnesium alloy sample body in the step (9) into an oven to bake for 2 hours. After chemical activation, the magnesium alloy sample can be further processed by being placed into an anti-corrosion treatment liquid, wherein the anti-corrosion treatment liquid comprises the following raw materials, by weight, 1% -3% of silane, 7% -14% of ethanol and 85% -90% of deionized water, the ethanol and the deionized water are uniformly stirred, then the silane is added in the ethanol and the deionized water, the mixture is soaked for 5-10 minutes, and the magnesium alloy part is treated by the anti-corrosion liquid and then is sent into an oven to be baked.

The magnesium alloy surface corrosion prevention treatment process of embodiment 2 and embodiment 1, in the step (1), the magnesium alloy sample body is soaked in alkali liquor at 70 ℃ for 5 minutes.

In the magnesium alloy surface anticorrosion treatment process of embodiment 3, embodiment 1 or 2, the chemical degreasing treatment in step (1) uses an alkaline solution, and the alkaline solution is an aqueous solution containing 40-50 g/LNaOH and 10-15 g/LNa3PO 4.12H 2O.

Example 4, the magnesium alloy surface anticorrosion treatment process described in example 1, 2 or 3, wherein the magnesium alloy sample in (3) is heated to 100 ℃, and then sandblasted by using emery with a particle size of 100-.

The magnesium alloy surface corrosion prevention treatment process according to any one of embodiments 5 and 1 to 4, wherein the magnesium alloy sample body is cleaned at 70 ℃ for 3 minutes in the step (4).

Embodiment 6, the magnesium alloy surface corrosion prevention treatment process according to any one of embodiments 1 to 5, wherein the washing time of the magnesium alloy sample in the step (5) is 2 minutes.

The magnesium alloy surface corrosion prevention treatment process according to embodiment 7 or any one of embodiments 1 to 6, wherein the etching time in the step (6) is 20 s.

Embodiment 8, the magnesium alloy surface corrosion prevention treatment process described in any one of embodiments 1 to 7, wherein the hydrochloric acid solution in the step (6) is phosphoric acid and phosphate solution with a concentration of 32 to 35%, and a molar ratio is configured to be 1: 1 to 1.5. The molar ratio of the phosphoric acid to the phosphate solution is 1: 1.5.

Embodiment 9, the magnesium alloy surface anticorrosion treatment process of any one of embodiments 1 to 8, wherein the vibration cleaning time of the magnesium alloy sample in the step (7) is 3 minutes.

Embodiment 10, the magnesium alloy surface anticorrosion treatment process of any one of embodiments 1 to 9, wherein the chemical activation treatment time of the magnesium alloy sample in the step (8) is 3 s.

The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept thereof within the scope of the present invention.