Method for carrying out surface activating treatment on surface of titanium alloy

A surface activation treatment, titanium alloy technology, applied in liquid chemical plating, gaseous chemical plating, metal material coating process, etc., can solve the problem of affecting the corrosion resistance of the final coating, unsuitable for manufacturing status, poor coating adhesion, etc. problems, to achieve the effect of eliminating the risk of corrosion, low production cost, and low environmental pollution

Active Publication Date: 2010-07-07
JIANGSU LINLONG NEW MATERIALS
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  • Abstract
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Problems solved by technology

[0004] However, although some achievements have been made in preventing contact corrosion of titanium alloys at home and abroad, there are still some problems in the above-mentioned means at present.
The common problem is that the coating layer obtained by the above-mentioned technical means is easy to peel off and lose the protective effect under the synergistic effect of environment and stress. For this reason, the pre-treatment of the titanium alloy, especially the activation treatment, is to improve the coating and the substrate. An important means of bonding strength and an important step in improving the contact corrosion resistance of coatings
However, because the activation solution used in the activation treatment in the prior art has a certain corrosive effect on the parts, it will cause disadvantages such as poor bonding force of the coating, thereby affecting the corrosion resistance of the final coating. Or hydrofluoric acid activation solution to activate the parts, which has a great impact on the environment
Therefore, the current activation treatment technology has great limitations, and a large number of titanium alloy fasteners in aircraft urgently need to solve the failure problem caused by contact corrosion, so the ordinary activation treatment method is not suitable for the current manufacturing status in our country

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  • Method for carrying out surface activating treatment on surface of titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047](1) After degreasing the parts, carry out rust removal treatment by liquid sandblasting, the abrasive particle size is 0.10mm, and the sandblasting time is 20 minutes. After blasting, a fine polish is achieved by mechanical grinding followed by ultrasonic cleaning in acetone solution followed by a deionized water rinse.

[0048] (2) Etch the parts after degreasing and derusting in the mixed solution of hydrochloric acid HCl 94% (volume fraction) + hydrofluoric acid HF 6% (volume fraction) at room temperature for 1 minute, and then rinse with deionized water.

[0049] (3) Activation treatment in a mixed solution of ethylene glycol, acidic ammonium fluoride, nickel chloride, boric acid, lactic acid, and acetic acid at a temperature of 40°C for 40 minutes, rinse with deionized water, and dry.

[0050] (4) Hot-dip coating.

Embodiment 2

[0052] (1) After degreasing the parts, carry out rust removal treatment by liquid sandblasting, the abrasive particle size is 0.12mm, and the sandblasting time is 15 minutes. After blasting, a fine polish is achieved by mechanical grinding followed by ultrasonic cleaning in acetone solution followed by a deionized water rinse.

[0053] (2) Etch the parts after degreasing and derusting in the mixed solution of hydrochloric acid HCl 95% (volume fraction) + hydrofluoric acid HF5% (volume fraction) at room temperature for 2 minutes, and then rinse with deionized water.

[0054] (3) Activation treatment in a mixed solution of ethylene glycol, acidic ammonium fluoride, nickel chloride, boric acid, lactic acid, and acetic acid at a temperature of 50°C for 35 minutes, rinse with deionized water, and dry.

[0055] (4) thermal spray coating.

Embodiment 3

[0057] (1) After degreasing the parts, carry out rust removal treatment by liquid sandblasting, the abrasive particle size is 0.15mm, and the sandblasting time is 10 minutes. After blasting, a fine polish is achieved by mechanical grinding followed by ultrasonic cleaning in acetone solution followed by a deionized water rinse.

[0058] (2) The parts after degreasing and derusting are etched in the mixed solution of hydrochloric acid HCl 96% (volume fraction) + hydrofluoric acid HF4% (volume fraction) at room temperature for 3 minutes, and then rinsed with deionized water.

[0059] (3) Thermal spraying, temperature 60°C, time 30min, rinse with deionized water, and dry.

[0060] (4) Electroplating coating.

[0061] Wherein, the composition and content of the activating solution of surface activation treatment in embodiment 1-3 are as shown in Table 1 below, and it should be noted that some preferred implementations of the composition and content of the activating solution of th...

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Abstract

The invention relates to a method for carrying out surface activating treatment on the surface of titanium alloy. The method includes the following steps: 1. oil and rust removing is first carried out on a titanium alloy base material part; 2. etching treatment is carried out on the part; 3. surface activating treatment is carried out on the part, wherein activating solution of the surface activating treatment is a mixture of glycol, acidic ammonium fluoride, nickel chloride, boric acid, lactic acid and acetic acid, the temperature of the surface activating treatment is within 40 to 60 DEG C, and the time of the surface activating treatment is within 30 to 40min; 4. drying and after-treatment procedures are carried out. Compared with the prior art, the method has the following characteristics: the activating time is short, the activating effect is good, no corrosion is incurred on the part, the risk of corrosion on the part is basically eliminated, and the environmental pollution is mild; with high stability and quick deposition, the activating solution that the method adopts can form a coating with good corrosion/wear resisting properties and good metallurgical combination with a matrix on the surface of the titanium alloy, thereby preventing contact corrosion between the titanium alloy part and aeronautical materials such as aluminum alloy, high-temperature alloy and the like.

Description

technical field [0001] The invention relates to a method for performing surface activation treatment on the surface of titanium alloy. Background technique [0002] With the rapid development of science and technology, titanium alloy has the advantages of high strength and strong corrosion resistance and has become an important aerospace material. The use of titanium alloy is of great significance to reduce the weight of the aircraft and improve the performance of the aircraft. However, titanium alloy itself has good corrosion resistance. However, when it is in contact with aluminum alloy and alloy steel, under the synergistic effect of stress and environment, it is prone to contact corrosion and lead to failure. [0003] Contact corrosion is a kind of galvanic corrosion, that is, dissimilar metals are in contact in the same medium. Due to the different metal potentials, the metal with a lower potential dissolves faster, resulting in localized corrosion at the contact. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10C25D5/38C23C18/18C23C2/02C23C14/02C23C16/02
Inventor 冯立新张敏燕张平则
Owner JIANGSU LINLONG NEW MATERIALS
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