A polishing method for titanium alloy surface

Abstract

The present invention relates to the field of marine pollution prevention and control, and in particular to a polishing treatment method for a titanium alloy surface. The method comprises surface polishing and chemical modification, wherein the chemical modification comprises: immersing the titanium alloy obtained by the surface polishing in a modifier for 1.5-3 hours, taking out and drying the titanium alloy, wherein the modifier comprises concentrated sulfuric acid, isopropyl alcohol and dimethoxymethyl (3,3,3-trifluoropropyl) silicon. The polishing treatment method for the titanium alloy surface provided by the present invention performs physical grinding and chemical etching on the material surface through surface polishing and chemical modification treatment. Compared with traditional antifouling coatings, the method has the advantages of simple construction, low cost and environmental friendliness, and does not cause the problem of deterioration of the antifouling effect caused by coating shedding during long-term use, thereby effectively preventing marine biopollution.

Description

Technical Field

[0001] The present invention relates to the field of marine pollution prevention and control, and in particular to a polishing treatment method for a titanium alloy surface. Background Art

[0002] Titanium alloys are widely used in ships because of their excellent anti-corrosion properties. However, because titanium alloys have good biocompatibility, marine organisms can easily attach to their surfaces, gradually corroding the interior of the titanium alloy and causing damage to the hull. Existing technologies often prevent and control marine biofouling by applying antifouling coatings on the surface of titanium alloys, such as self-polishing antifouling coatings. When marine organisms attach to the surface of the coating, the self-polishing antifouling coatings undergo a series of physical and chemical reactions, which allows the surface layer to self-shed and refresh. At the same time, the inner layer of the coating is exposed to continue to play a protective role, and the antifouling agent contained in the coating is also released in this process. After such a cycle, the coating achieves continuous antifouling and self-polishing effects.

[0003] However, existing antifouling coatings are difficult to bond tightly to titanium alloy surfaces and may fall off for various reasons, resulting in a short-lasting antifouling effect. In addition, the antifouling agent in the coating is generally cuprous oxide, which has toxicity that can affect the growth and reproduction of seaweed and various fish and shrimp in the ocean, damaging the ecological environment. Environmentally friendly natural antifouling agents are generally extracted from animals and plants. The extraction process is complex and the cost is high, so they are not widely used. Summary of the Invention

[0004] In order to solve the problem that the existing anti-fouling coating has a short-lasting anti-fouling effect and is not conducive to environmental protection, the present invention provides a polishing method for the surface of a titanium alloy, which is used to effectively prevent and control marine biological pollution of the titanium alloy in the marine environment. It has the advantages of not destroying the passivation layer on the surface of the titanium alloy, simple operation, and environmental friendliness.

[0005] The present invention provides a method for polishing the surface of a titanium alloy, which includes surface polishing and chemical modification. The chemical modification comprises: soaking the titanium alloy obtained by the surface polishing in a modifier for 1.5-3 hours, taking it out and drying it. The modifier comprises concentrated sulfuric acid, isopropyl alcohol and dimethoxymethyl (3,3,3-trifluoropropyl) silicon.

[0006] Furthermore, the surface polishing includes rough polishing and chemical mechanical polishing.

[0007] Furthermore, the rough polishing is divided into four stages. In the first stage, 500-800 grit sandpaper is used as the polishing pad, water is used as the lubricant, the polishing pad speed is 150-300 r / min, the clamping pressure is 160-180 N, and the polishing time is 80-120 s;

[0008] In the second stage, 1200-1500 grit sandpaper is used as a polishing pad, water is used as a lubricant, the polishing pad speed is 150-300 r / min, the clamping pressure is 130-150 N, and the polishing time is 80-120 s;

[0009] In the third stage, 2000-2500 grit sandpaper is used as a polishing pad, water is used as a lubricant, the polishing pad speed is 150-300 r / min, the clamping pressure is 120 N, and the polishing time is 80-120 s;

[0010] In the fourth stage, 3000-4000 grit sandpaper is used as a polishing pad, water is used as a lubricant, the polishing pad rotates at a speed of 150-300 r / min, the clamping pressure is 90 N, and the polishing time is 80-120 s.

[0011] Furthermore, the chemical mechanical polishing uses an MD-chem polishing pad, and a chemical mechanical polishing liquid is added dropwise. The chemical mechanical polishing liquid comprises, by mass fraction, 90% of a polishing liquid containing 0.25 μm SiO2 abrasive and 10% of 30% hydrogen peroxide. The polishing pad rotates at a speed of 150-300 r / min, the pressure applied by the fixture is 90-100 N, and the polishing time is 15-20 min.

[0012] Furthermore, the titanium alloy is subjected to surface polishing, cleaning, air-drying and hydroxylation before being subjected to the chemical modification.

[0013] Furthermore, the cleaning is as follows: immersing the titanium alloy in pure water and placing it in an ultrasonic cleaner for cleaning for 20-40 seconds, air-drying, then immersing the titanium alloy in anhydrous ethanol and placing it in an ultrasonic cleaner for cleaning for 20-40 seconds, and air-drying for later use.

[0014] Furthermore, the titanium alloy is placed in a plasma cleaning apparatus, the power is set to 100-120W, and the cleaning is carried out for 60-80s.

[0015] Furthermore, the modifier includes, by mass fraction, 1% concentrated sulfuric acid, 89% isopropyl alcohol, and 9% dimethoxymethyl (3,3,3-trifluoropropyl) silicon.

[0016] Furthermore, after the titanium alloy is chemically modified, it is air-dried for 30-40 minutes, and then the surface is cleaned with deionized water. After air-drying, a lubricant is sprayed on the surface.

[0017] The hydroxyl groups on the surface of the titanium alloy are activated by a low-temperature plasma cleaner, and then dimethoxymethyl (3,3,3-trifluoropropyl) silicon undergoes a condensation reaction in an end-to-end manner to form a molecular brush, which is then grafted onto the substrate by chemical bonds with the hydroxyl active sites on the surface of the modified titanium alloy. The sprayed lubricating oil can cause the molecular brush to stretch out, forming a slip layer on the surface of the titanium alloy, thereby exerting an anti-fouling effect.

[0018] Compared with the existing technology, the polishing method for the titanium alloy surface provided by the present invention performs physical grinding and chemical etching on the material surface through surface polishing and chemical modification treatment. Compared with traditional antifouling coatings, it has the advantages of simple construction, low cost, and environmental friendliness. In addition, there will be no problem of coating shedding causing the antifouling effect to deteriorate due to long-term use, thereby effectively avoiding marine biological pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a graph showing the characterization results of the titanium alloy surface obtained by the polishing method provided in an embodiment of the present invention and the untreated titanium alloy surface;

[0021] Figure 2 Result diagram of the embodiment, comparative example and untreated titanium alloy offshore cladding provided by the present invention;

[0022] Figure 3 These are contact angle test diagrams of the embodiments, comparative examples, and untreated titanium alloys provided by the present invention. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] The present invention provides a method for polishing a titanium alloy surface, comprising the following steps:

[0025] S1. Roughly polish the titanium alloy surface: use 500-4000 grit sandpaper as a polishing pad, use water as a lubricant, the polishing pad speed is 150-300 r / min, the clamp pressure is 90-180 N, and the polishing time is 120-480 s;

[0026] S2. Chemical mechanical polishing of the titanium alloy obtained in step S1: using an MD-chem polishing pad, adding a chemical mechanical polishing solution dropwise, wherein the chemical mechanical polishing solution comprises, by mass fraction, 90% of a polishing solution containing 0.25 μm SiO2 abrasive and 10% of 30% hydrogen peroxide solution, the polishing pad rotating speed being 150 r / min, the fixture applying pressure being 90 N, and the polishing time being 15-20 min;

[0027] S3, soaking the titanium alloy obtained in step S2 in pure water and placing it in an ultrasonic cleaner for cleaning for 20-40 seconds, air-drying, then soaking the titanium alloy in anhydrous ethanol and placing it in an ultrasonic cleaner for cleaning for 20-40 seconds, and air-drying for later use;

[0028] S4. Place the titanium alloy obtained in step S3 in a plasma cleaning apparatus, set the power to 100-120W, and after cleaning for 60-80s, quickly place the titanium alloy in a modifier and soak it for 1.5-3h. After taking it out, air-dry it for 30-40min, then use deionized water to clean the surface, and spray lubricant after air-drying.

[0029] Example 1

[0030] A method for polishing a titanium alloy surface comprises the following steps:

[0031] S1. Rough polishing of the titanium alloy surface: divided into four stages. In the first stage, 500-grit sandpaper is used as the polishing pad, water is used as the lubricant, the polishing pad speed is 300 r / min, the clamping pressure is 180 N, and the polishing time is 120 s.

[0032] In the second stage, 1200-grit sandpaper was used as the polishing pad, water was used as the lubricant, the polishing pad speed was 150 r / min, the clamping pressure was 150 N, and the polishing time was 120 s;

[0033] In the third stage, 2000-grit sandpaper was used as the polishing pad, water was used as the lubricant, the polishing pad speed was 150 r / min, the clamping pressure was 120 N, and the polishing time was 120 s;

[0034] In the fourth stage, 4000-grit sandpaper was used as the polishing pad, water was used as the lubricant, the polishing pad speed was 150 r / min, the clamping pressure was 90 N, and the polishing time was 120 s;

[0035] S2. Chemical mechanical polishing of the titanium alloy obtained in step S1: using an MD-chem polishing pad, adding a chemical mechanical polishing solution dropwise, wherein the chemical mechanical polishing solution comprises, by mass fraction, 90% of a polishing solution containing 0.25 μm SiO2 abrasive and 10% of 30% hydrogen peroxide solution, the polishing pad rotating speed being 150 r / min, the fixture applying pressure being 90 N, and the polishing time being 15 min;

[0036] S3, soaking the titanium alloy obtained in step S2 in pure water and placing it in an ultrasonic cleaner for cleaning for 20 seconds, air-drying, then soaking the titanium alloy in anhydrous ethanol and placing it in an ultrasonic cleaner for cleaning for 20 seconds, and air-drying for later use;

[0037] S4. Place the titanium alloy obtained in step S3 in a plasma cleaning apparatus, set the power to 100 W, and after cleaning for 60 seconds, quickly place the titanium alloy in a modifier and soak it for 1.5 hours. After taking it out, air-dry it for 30 minutes, then clean the surface with deionized water, and spray it with Krytox 103 after air-drying.

[0038] Example 2

[0039] A method for polishing a titanium alloy surface comprises the following steps:

[0040] S1. Rough polishing of the titanium alloy surface: divided into three stages. In the first stage, 500-grit sandpaper is used as a polishing pad, water is used as a lubricant, the polishing pad speed is 300 r / min, the clamping pressure is 180 N, and the polishing time is 120 s.

[0041] In the second stage, 2000-grit sandpaper was used as the polishing pad, water was used as the lubricant, the polishing pad speed was 150 r / min, the clamping pressure was 120 N, and the polishing time was 120 s;

[0042] In the third stage, 4000-grit sandpaper was used as the polishing pad, water was used as the lubricant, the polishing pad speed was 150 r / min, the clamping pressure was 90 N, and the polishing time was 120 s;

[0043] S2. Chemical mechanical polishing of the titanium alloy obtained in step S1: using an MD-chem polishing pad, adding a chemical mechanical polishing solution dropwise, wherein the chemical mechanical polishing solution comprises, by mass fraction, 90% of a polishing solution containing 0.25 μm SiO2 abrasive and 10% of 30% hydrogen peroxide, the polishing pad rotating speed being 150 r / min, the fixture applying pressure being 90 N, and the polishing time being 20 min;

[0044] S3, soaking the titanium alloy obtained in step S2 in pure water and placing it in an ultrasonic cleaner for cleaning for 30 seconds, air-drying, then soaking the titanium alloy in anhydrous ethanol and placing it in an ultrasonic cleaner for cleaning for 30 seconds, and air-drying for later use;

[0045] S4. Place the titanium alloy obtained in step S3 in a plasma cleaning apparatus, set the power to 120 W, and after cleaning for 70 seconds, quickly place the titanium alloy in a modifier and soak for 2 hours. After taking it out, air-dry it for 40 minutes, then clean the surface with deionized water, and spray Krytox 103 after air-drying.

[0046] Example 3

[0047] A method for polishing a titanium alloy surface comprises the following steps:

[0048] S1. Rough polishing of the titanium alloy surface: divided into two stages. In the first stage, 1000-grit sandpaper is used as a polishing pad, water is used as a lubricant, the polishing pad speed is 300 r / min, the clamping pressure is 180 N, and the polishing time is 240 s.

[0049] In the second stage, 4000-grit sandpaper was used as the polishing pad, water was used as the lubricant, the polishing pad speed was 150 r / min, the clamping pressure was 90 N, and the polishing time was 240 s;

[0050] S2. Chemical mechanical polishing of the titanium alloy obtained in step S1: using an MD-chem polishing pad, adding a chemical mechanical polishing solution dropwise, wherein the chemical mechanical polishing solution comprises, by mass fraction, 90% of a polishing solution containing 0.25 μm SiO2 abrasive and 10% of 30% hydrogen peroxide solution, the polishing pad rotating speed being 150 r / min, the fixture applying pressure being 90 N, and the polishing time being 18 min;

[0051] S3, soaking the titanium alloy obtained in step S2 in pure water and placing it in an ultrasonic cleaner for cleaning for 40 seconds, air-drying, then soaking the titanium alloy in anhydrous ethanol and placing it in an ultrasonic cleaner for cleaning for 40 seconds, and air-drying for later use;

[0052] S4. Place the titanium alloy obtained in step S3 in a plasma cleaning apparatus, set the power to 110 W, and after cleaning for 80 seconds, quickly place the titanium alloy in a modifier and soak for 3 hours. After taking it out, air-dry it for 35 minutes, then wash the surface with deionized water, and spray Krytox 103 after air-drying.

[0053] Comparative Example 1

[0054] A method for polishing a titanium alloy surface is provided. The method differs from Example 1 in that step S4 is not performed, and the remaining steps are the same as those of Example 1.

[0055] Comparative Example 2

[0056] A method for polishing the surface of a titanium alloy, which is different from Example 1 in that step S1-3 is not performed, that is, the titanium alloy is directly placed in a plasma cleaner, the power is set to 100W, and after cleaning for 80 seconds, the titanium alloy is quickly placed in a modifier and soaked for 3 hours. After taking it out, it is air-dried for 35 minutes, and then the surface is cleaned with deionized water and air-dried.

[0057] Comparative Example 3

[0058] A method for polishing the surface of a titanium alloy is different from that of Example 1 in that step S2 is not performed, and in step S3 the titanium alloy obtained in step S1 is processed, and the remaining steps are the same as those of Example 1.

[0059] The untreated titanium alloy and the titanium alloy obtained by the treatment in Example 1 were characterized by scanning electron microscopy (SEM) and elemental analysis was performed. Figure 1 . Figure 1 Among them, (a) is the SEM image of the untreated titanium alloy surface, (b) is the SEM image of the titanium alloy surface obtained by treatment in Example 1, and the rest are Mapping element analysis images of the titanium alloy surface obtained by treatment in Example 1.

[0060] from Figure 1 It can be seen from the figure that the surface of the titanium alloy modified with dimethoxymethyl (3,3,3-trifluoropropyl) silicon molecular brush is rougher, and it can be seen from the mapping diagram that Si, O and F elements appear on the surface, proving that after surface polishing and chemical modification, the titanium alloy surface has been successfully grafted with dimethoxymethyl (3,3,3-trifluoropropyl) silicon to obtain the expected titanium alloy surface morphology.

[0061] The titanium alloys obtained in Example 1 and Comparative Examples 1-3 and the titanium alloys without any treatment were cut into titanium plates of the same area and hung on the sea for hanging plate experiments. The hanging plate experiments were carried out with reference to the shallow sea immersion test method of antifouling paint sample GB / T 5370-2007. After 45 days, the plates were removed and photographed to obtain the Figure 2 .

[0062] Figure 2As shown in the figure, after 45 days of offshore hanging experiments, (e) is a titanium alloy without any treatment, and a large number of marine organisms such as algae and barnacles are attached to its surface, indicating serious biological pollution; (a) is the titanium alloy of Example 1, and the number of marine organisms on its surface is very small; (b) is the titanium alloy of Comparative Example 1, and the algae on its surface are more than those in Example 1, and there is slight marine biological pollution; (c) is the titanium alloy of Comparative Example 2, and the degree of marine biological pollution on its surface is significantly greater than that in Example 1, and some areas have already shown obvious corrosion; (d) is the titanium alloy of Comparative Example 3, and some marine organism larvae are present on its surface, with less algae attached, and the titanium alloy surface is obviously dirty. Therefore, the polishing treatment method for the titanium alloy surface provided by the present invention can effectively prevent marine biological pollution by combining surface polishing and chemical modification treatment. The lack of any of these treatments will affect the anti-fouling effect of the titanium alloy.

[0063] The contact angles of the titanium alloys obtained in Example 1 and Comparative Examples 1-3 and the titanium alloys without any treatment were tested. Figure 3 The contact angle was measured using the Biolin Theta Flex optical contact angle meter.

[0064] Figure 3 As shown, Example 1 ( Figure 3 a) The contact angle of the surface modified by molecular brush is significantly greater than that of the titanium alloy in comparative examples 1-3 and the untreated titanium alloy ( Figure 3 b-3e), it can be seen that the smooth surface modified by the molecular brush has better hydrophobicity. Figure 3 c) and Comparative Example 3 ( Figure 3 d) By comparison, it can be seen that polishing the surface of the titanium alloy material and then modifying it with a molecular brush can improve the degree of bonding between the molecular brush and the material surface, increase the contact angle of the material surface, and enhance the hydrophobicity of the material surface, thereby effectively preventing marine biological pollution.

[0065] In summary, the polishing method for the titanium alloy surface provided by the present invention can effectively prevent marine biological pollution, and has the advantages of not destroying the passivation layer on the titanium alloy surface, simple operation, and environmental friendliness. It is suitable for marine pollution prevention and control of various ships.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for polishing a titanium alloy surface, characterized in that: The method comprises surface polishing and chemical modification, wherein the chemical modification comprises: soaking the titanium alloy obtained by the surface polishing in a modifier for 1.5-3 hours, taking out and drying the titanium alloy; the modifier comprises concentrated sulfuric acid, isopropyl alcohol and dimethoxymethyl (3,3,3-trifluoropropyl) silicon; The surface polishing includes rough polishing and chemical mechanical polishing; The titanium alloy is subjected to surface polishing, cleaning, air drying and hydroxylation before being subjected to the chemical modification; After the titanium alloy is chemically modified, it is air-dried for 30-40 minutes, and then the surface is cleaned with deionized water. After air-drying, a lubricant is sprayed on the surface to obtain the titanium alloy.

2. The polishing method according to claim 1, wherein: The rough polishing uses 500-4000 mesh sandpaper as the polishing pad, uses water as the lubricating liquid, the polishing pad rotation speed is 150-300 r / min, the clamping pressure is 90-180N, and the polishing time is 120-480s.

3. The polishing method according to claim 2, wherein: The rough polishing is divided into four stages. In the first stage, 500-800 mesh sandpaper is used as the polishing pad, water is used as the lubricant, the polishing pad speed is 150-300 r / min, the clamping pressure is 160-180 N, and the polishing time is 80-120 s; In the second stage, 1200-1500 grit sandpaper is used as a polishing pad, water is used as a lubricant, the polishing pad speed is 150-300 r / min, the clamping pressure is 130-150 N, and the polishing time is 80-120 s; In the third stage, 2000-2500 grit sandpaper is used as a polishing pad, water is used as a lubricant, the polishing pad speed is 150-300 r / min, the clamping pressure is 120 N, and the polishing time is 80-120 s; In the fourth stage, 3000-4000 grit sandpaper is used as a polishing pad, water is used as a lubricant, the polishing pad rotates at a speed of 150-300 r / min, the clamping pressure is 90 N, and the polishing time is 80-120 s.

4. The polishing method according to claim 1, wherein: The chemical mechanical polishing uses an MD-chem polishing pad, and a chemical mechanical polishing liquid is added dropwise. The chemical mechanical polishing liquid comprises, by mass fraction, 90% of a polishing liquid containing 0.25 μm SiO2 abrasive and 10% of 30% hydrogen peroxide. The polishing pad rotates at a speed of 150-300 r / min, the fixture applies a pressure of 90-100 N, and the polishing time is 15-20 min.

5. The polishing method according to claim 1, wherein: The cleaning comprises the following steps: immersing the titanium alloy in pure water and placing the titanium alloy in an ultrasonic cleaning apparatus for cleaning for 20-40 seconds, air-drying the titanium alloy, then immersing the titanium alloy in anhydrous ethanol and placing the titanium alloy in an ultrasonic cleaning apparatus for cleaning for 20-40 seconds, and air-drying the titanium alloy for later use.

6. The polishing method according to claim 1, wherein: The hydroxylation treatment is as follows: placing the titanium alloy in a plasma cleaning apparatus, setting the power to 100-120W, and cleaning for 60-80s.

7. The polishing method according to claim 1, wherein: In terms of mass fraction, the modifying agent includes 1% concentrated sulfuric acid, 89% isopropyl alcohol and 9% dimethoxymethyl (3,3,3-trifluoropropyl) silicon.

Images