Method for improving corrosion resistance of material based on laser shock peening technology

Abstract

The invention relates to the technical field of laser shock peening surface modification, and discloses a method for improving corrosion resistance of a material based on a laser shock peening technology. The method for improving the material corrosion resistance based on the laser shock peening technology comprises the following steps that an absorption layer material, a composite absorption layer material and a restraint layer material are sequentially and evenly sprayed to the surface of a to-be-peened material, and then the surface of the to-be-peened material is subjected to laser shock peening. According to the method for improving the corrosion resistance of the material based on the laser shock peening technology, the two absorbing layers are adopted, the material and the thickness of each absorbing layer are optimized, and the corrosion resistance of the material is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser shock peening surface modification, and in particular to a method for improving the corrosion resistance of a material based on the laser shock peening technology. Background Art

[0002] Corrosion resistance refers to the ability of a material to resist the corrosive damage of the surrounding medium. The corrosion resistance of a material is one of the important indicators to measure the quality of the material, and has a vital impact on the service life, performance and quality of various mechanical equipment and industrial products. Therefore, how to improve the corrosion resistance of materials has become a research hotspot for technicians in this field. Existing studies have found that appropriate surface treatment of the material surface can effectively improve the corrosion resistance of the material.

[0003] Laser shock peening technology is an emerging surface treatment technology that uses the plasma shock mechanics effect induced by a high-power density, low-pulse width laser beam to modify the material surface. Compared with traditional surface treatment technologies such as hardening and quenching, laser shock peening technology has almost no thermal effect on the material surface and has significant advantages such as cleanliness, environmental protection, high operating efficiency and strong controllability.

[0004] However, with the practical application of laser strengthening technology, when using laser strengthening technology to modify the material surface to improve the corrosion resistance of the material, a large amount of energy is required to generate the laser beam, and the energy of the laser beam has a certain spatial non-uniformity, which will cause excessive thermal damage and deformation on the material surface, which is not conducive to improving the corrosion resistance of the material.

[0005] Therefore, improving the laser strengthening technology and developing a laser strengthening technology solution that can effectively improve the corrosion resistance of materials by effectively avoiding excessive thermal damage and deformation has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to provide a method for improving the corrosion resistance of materials based on laser shock peening technology. The method for improving the corrosion resistance of materials based on laser shock peening technology can effectively improve the corrosion resistance of materials by effectively avoiding excessive thermal damage and deformation.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for improving the corrosion resistance of a material based on laser shock peening technology comprises the following steps:

[0009] The absorption layer material, the composite absorption layer material and the constraint layer material are sprayed uniformly on the surface of the material to be strengthened in sequence, and then the surface of the material to be strengthened is subjected to laser shock strengthening.

[0010] Furthermore, the absorption layer material is ferrosoferric oxide.

[0011] Furthermore, the spraying thickness of the absorption layer material is 1 μm to 5 μm.

[0012] Furthermore, the preparation method of the composite absorption layer material comprises the following steps: weighing each raw material according to the following mass ratio: 20 to 40 parts of modified carbon fiber, 10 to 15 parts of epoxy resin and 5 to 10 parts of ferrosoferric oxide, and then mixing the weighed raw materials to obtain the composite absorption layer material.

[0013] Furthermore, the preparation method of the modified carbon fiber comprises the following steps: preparing the modified carbon fiber and the carbon fiber with a concentration of 0.5 mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fiber is immersed in a NaOH solution at 50° C. for 20 minutes to obtain the modified carbon fiber.

[0014] Furthermore, the spraying thickness of the composite absorption layer material is 10 μm to 50 μm.

[0015] Furthermore, the constraining layer material is K9 glass.

[0016] Furthermore, the spraying thickness of the constraining layer material is 5 mm.

[0017] Furthermore, the parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a method for improving the corrosion resistance of materials based on laser shock peening technology, which adopts a double-layer absorption layer and optimizes the material and thickness of each absorption layer, thereby effectively improving the corrosion resistance of the material. DETAILED DESCRIPTION

[0020] Now, various exemplary embodiments of the present invention are described in detail, and this detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present invention. It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0021] In addition, for the numerical range in the present invention, it is understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0022] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0023] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0024] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0025] In the following embodiment, a method for improving the corrosion resistance of a material based on laser shock peening technology comprises the following steps:

[0026] 1) According to the carbon fiber and concentration of 0.5mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fibers were immersed in a NaOH solution at 50°C for 20 min to obtain modified carbon fibers;

[0027] 2) Weigh each raw material according to the following mass ratio:

[0028] 20-40 parts of modified carbon fiber, 10-15 parts of epoxy resin and 5-10 parts of ferrosoferric oxide;

[0029] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0030] 4) spraying ferroferric oxide with a thickness of 1 μm to 5 μm, the composite absorption layer material obtained in step 3) with a thickness of 10 μm to 50 μm, and K9 glass with a thickness of 5 mm uniformly on the surface of the material to be strengthened, and then performing laser shock strengthening on the surface of the material to be strengthened;

[0031] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0032] In the following embodiments, titanium alloy TC4 is used as an example for laser shock strengthening. Those skilled in the art can refer to the method described in the present invention to perform laser shock strengthening on any material to be strengthened.

[0033] Embodiments 1 to 5

[0034] A method for improving the corrosion resistance of materials based on laser shock peening technology

[0035] 1) According to the carbon fiber and concentration of 0.5 mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fibers were immersed in a NaOH solution at 50°C for 20 min to obtain modified carbon fibers;

[0036] 2) Weigh each raw material according to the mass ratio recorded in Table 1;

[0037] Table 1: Mass ratio of each raw material (part)

[0038]

[0039] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0040] 4) spraying ferroferric oxide with a thickness of 1 μm, the composite absorption layer material obtained in step 3) with a thickness of 10 μm, and K9 glass with a thickness of 5 mm uniformly onto the surface of the titanium alloy TC4, and then performing laser shock strengthening on the surface of the titanium alloy TC4;

[0041] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0042] The corrosion resistance of titanium alloy TC4 after laser shock strengthening in Examples 1 to 5 was tested, and the corrosion resistance test results are shown in Table 2;

[0043] Table 2 Corrosion resistance test results

[0044]

[0045] Note: Since titanium alloy TC4 has excellent corrosion resistance in environments containing acidic substances and alkaline substances, only the corrosion resistance in environments containing chlorides is tested;

[0046] It can be seen from the data in Table 2 that the content of modified carbon fiber in the composite absorption layer material will affect the corrosion resistance of titanium alloy TC4. In the test range of 20 to 40 parts, the corrosion rate of titanium alloy TC4 first decreases and then increases, that is, the corrosion resistance first increases and then decreases. The optimal corrosion resistance is achieved at 30 parts, so the content of modified carbon fiber is preferably 30 parts.

[0047] Embodiments 6 to 10

[0048] A method for improving the corrosion resistance of materials based on laser shock peening technology

[0049] 1) According to the carbon fiber and concentration of 0.5 mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fibers were immersed in a NaOH solution at 50°C for 20 min to obtain modified carbon fibers;

[0050] 2) Weigh each raw material according to the mass ratio recorded in Table 3;

[0051] Table 3 Mass ratio of each raw material (part)

[0052]

[0053]

[0054] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0055] 4) spraying ferroferric oxide with a thickness of 1 μm, the composite absorption layer material obtained in step 3) with a thickness of 10 μm, and K9 glass with a thickness of 5 mm uniformly onto the surface of the titanium alloy TC4, and then performing laser shock strengthening on the surface of the titanium alloy TC4;

[0056] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0057] The corrosion resistance of titanium alloy TC4 after laser shock strengthening in Examples 6 to 10 was tested, and the corrosion resistance test results are shown in Table 4;

[0058] Table 4 Corrosion resistance test results

[0059]

[0060] It can be seen from the data in Table 4 that the epoxy resin content in the composite absorption layer material will affect the corrosion resistance of titanium alloy TC4. Within the test range of 10 to 15 parts, the corrosion rate of titanium alloy TC4 first decreases and then increases, that is, the corrosion resistance first increases and then decreases. The optimal corrosion resistance is achieved at 12 parts, so the epoxy resin content is preferably 12 parts.

[0061] Examples 11 to 15

[0062] A method for improving the corrosion resistance of materials based on laser shock peening technology

[0063] 1) According to the carbon fiber and concentration of 0.5 mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fibers were immersed in a NaOH solution at 50°C for 20 min to obtain modified carbon fibers;

[0064] 2) Weigh each raw material according to the mass ratio recorded in Table 5;

[0065] Table 5: Mass ratio of each raw material (part)

[0066]

[0067] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0068] 4) spraying ferroferric oxide with a thickness of 1 μm, the composite absorption layer material obtained in step 3) with a thickness of 10 μm, and K9 glass with a thickness of 5 mm uniformly onto the surface of the titanium alloy TC4, and then performing laser shock strengthening on the surface of the titanium alloy TC4;

[0069] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0070] The corrosion resistance of titanium alloy TC4 after laser shock strengthening in Examples 11 to 15 was tested, and the corrosion resistance test results are shown in Table 6;

[0071] Table 6 Corrosion resistance test results

[0072]

[0073] It can be seen from the data in Table 6 that the content of ferrosoferric oxide in the composite absorption layer material will affect the corrosion resistance of titanium alloy TC4. Within the test range of 5 to 10 parts, the corrosion rate of titanium alloy TC4 first decreases and then increases, that is, the corrosion resistance first increases and then decreases. The optimal corrosion resistance is achieved at 8 parts, so the content of ferrosoferric oxide is preferably 8 parts.

[0074] Comparative Example 1

[0075] A method for improving the corrosion resistance of materials based on laser shock peening technology

[0076] 1) Weigh each raw material according to the following mass ratio:

[0077] 30 parts of carbon fiber, 12 parts of epoxy resin and 8 parts of ferrosoferric oxide;

[0078] 2) mixing the raw materials weighed in step 1) to obtain a composite absorption layer material;

[0079] 3) Spraying ferroferric oxide with a thickness of 1 μm, the composite absorption layer material obtained in step 2) with a thickness of 10 μm, and K9 glass with a thickness of 5 mm uniformly on the surface of the titanium alloy TC4, and then performing laser shock strengthening on the surface of the titanium alloy TC4;

[0080] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0081] The corrosion resistance of the titanium alloy TC4 after laser shock strengthening in comparative example 1 was tested. The corrosion rate (3.5% NaCl solution) of the titanium alloy TC4 after laser shock strengthening in comparative example 1 was 0.31 mm / year.

[0082] It can be seen from Comparative Example 1 that omitting the modification of carbon fiber will reduce the corrosion resistance of titanium alloy TC4.

[0083] Embodiments 16 to 19

[0084] 1) According to the carbon fiber and concentration of 0.5 mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fibers were immersed in a NaOH solution at 50°C for 20 min to obtain modified carbon fibers;

[0085] 2) Weigh each raw material according to the following mass ratio:

[0086] 30 parts of modified carbon fiber, 12 parts of epoxy resin and 8 parts of ferrosoferric oxide;

[0087] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0088] 4) Iron oxide (thickness as shown in Table 7), the composite absorption layer material obtained in step 3) with a thickness of 10 μm, and K9 glass with a thickness of 5 mm were uniformly sprayed on the surface of the titanium alloy TC4 in sequence, and then the surface of the titanium alloy TC4 was laser shock strengthened;

[0089] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0090] Table 7 Thickness of the absorption layer

[0091]

[0092]

[0093] The corrosion resistance of titanium alloy TC4 after laser shock strengthening in Examples 16 to 19 was tested, and the results of the corrosion resistance test are shown in Table 8;

[0094] Table 8 Corrosion resistance test results

[0095]

[0096] It can be seen from the data in Table 8 that the thickness of the absorption layer will affect the corrosion resistance of the titanium alloy TC4. Within the test range of 1μm to 5μm, the corrosion rate of the titanium alloy TC4 first decreases and then increases, that is, the corrosion resistance first increases and then decreases. The optimal corrosion resistance is achieved at 4μm, so the thickness of the absorption layer is preferably 4μm.

[0097] Embodiments 20 to 23

[0098] 1) According to the carbon fiber and concentration of 0.5 mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fibers were immersed in a NaOH solution at 50°C for 20 min to obtain modified carbon fibers;

[0099] 2) Weigh each raw material according to the following mass ratio:

[0100] 30 parts of modified carbon fiber, 12 parts of epoxy resin and 8 parts of ferrosoferric oxide;

[0101] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0102] 4) ferroferric oxide with a thickness of 4 μm, the composite absorption layer material obtained in step 3) (thickness as shown in Table 9) and K9 glass with a thickness of 5 mm were uniformly sprayed on the surface of the titanium alloy TC4 in sequence, and then the surface of the titanium alloy TC4 was laser shock strengthened;

[0103] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0104] Table 9 Thickness of composite absorption layer

[0105]

[0106] The corrosion resistance of titanium alloy TC4 after laser shock strengthening in Examples 20 to 23 was tested, and the results of the corrosion resistance test are shown in Table 10;

[0107] Table 10 Corrosion resistance test results

[0108]

[0109] It can be seen from the data in Table 10 that the thickness of the composite absorption layer will affect the corrosion resistance of the titanium alloy TC4. Within the test range of 10μm to 50μm, the corrosion rate of the titanium alloy TC4 first decreases and then increases, that is, the corrosion resistance first increases and then decreases, and the optimal corrosion resistance is achieved at 30μm, so the thickness of the composite absorption layer is preferably 30μm.

[0110] Comparative Example 2

[0111] A method for improving the corrosion resistance of materials based on laser shock peening technology

[0112] 1) According to the carbon fiber and concentration of 0.5 mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fibers were immersed in a NaOH solution at 50°C for 20 min to obtain modified carbon fibers;

[0113] 2) Weigh each raw material according to the following mass ratio:

[0114] 30 parts of modified carbon fiber, 12 parts of epoxy resin and 8 parts of ferrosoferric oxide;

[0115] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0116] 4) The composite absorption layer material obtained in step 3) and K9 glass with a thickness of 5 mm are uniformly sprayed onto the surface of the titanium alloy TC4 in sequence, and then the surface of the titanium alloy TC4 is laser shock strengthened;

[0117] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0118] The corrosion resistance of the titanium alloy TC4 after laser shock strengthening in comparative example 2 was tested. The corrosion rate (3.5% NaCl solution) of the titanium alloy TC4 after laser shock strengthening in comparative example 2 was 0.20 mm / year.

[0119] It can be seen from Comparative Example 2 that omitting the spraying of the absorption layer material will reduce the corrosion resistance of the titanium alloy TC4.

[0120] Comparative Example 3

[0121] A method for improving the corrosion resistance of materials based on laser shock peening technology

[0122] The surface of the titanium alloy TC4 is uniformly sprayed with ferroferric oxide with a thickness of 4 μm and K9 glass with a thickness of 5 mm in sequence, and then the surface of the titanium alloy TC4 is laser shock strengthened;

[0123] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0124] The corrosion resistance of the titanium alloy TC4 after laser shock strengthening in comparative example 3 was tested. The corrosion rate (3.5% NaCl solution) of the titanium alloy TC4 after laser shock strengthening in comparative example 3 was 0.27 mm / year.

[0125] It can be seen from Comparative Example 3 that omitting the spraying of the composite absorption layer material will reduce the corrosion resistance of the titanium alloy TC4.

[0126] In addition, the present invention also uses β-titanium alloy, austenitic stainless steel and other materials as materials to be strengthened for laser shock strengthening. It has been verified that no matter what kind of material is used, a composite absorption layer is prepared with 30 parts of modified carbon fiber, 12 parts of epoxy resin and 8 parts of ferroferric oxide as raw materials, and the thickness of the ferroferric oxide in the absorption layer is controlled to be 4μm, and the thickness of the composite absorption layer is 30μm, which can most effectively improve the corrosion resistance of the material.

[0127] 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, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for improving the corrosion resistance of materials based on laser shock peening technology, characterized in that: The following steps are involved: The absorption layer material, the composite absorption layer material and the constraint layer material are sprayed uniformly on the surface of the material to be strengthened in sequence, and then the surface of the material to be strengthened is subjected to laser shock strengthening.

2. The method for improving the corrosion resistance of materials based on laser shock peening technology according to claim 1, characterized in that: The absorption layer material is ferrosoferric oxide.

3. The method for improving the corrosion resistance of materials based on laser shock peening technology according to claim 1, characterized in that: The spraying thickness of the absorption layer material is 1 μm to 5 μm.

4. The method for improving the corrosion resistance of materials based on laser shock peening technology according to claim 1, characterized in that: The preparation method of the composite absorption layer material comprises the following steps: weighing each raw material according to the following mass ratio: 20 to 40 parts of modified carbon fiber, 10 to 15 parts of epoxy resin and 5 to 10 parts of ferrosoferric oxide, and then mixing the weighed raw materials to obtain the composite absorption layer material.

5. The method for improving the corrosion resistance of materials based on laser shock peening technology according to claim 4, characterized in that: The preparation method of the modified carbon fiber comprises the following steps: preparing the modified carbon fiber and the carbon fiber with a concentration of 0.5 mol·L -1 The mass volume ratio of the NaOH solution is 1g:10mL, and the carbon fiber is placed in a concentration of 0.5mol·L -1 The modified carbon fiber is immersed in a NaOH solution at 50° C. for 20 minutes to obtain the modified carbon fiber.

6. The method for improving the corrosion resistance of materials based on laser shock peening technology according to claim 1, characterized in that: The spraying thickness of the composite absorption layer material is 10 μm to 50 μm.

7. The method for improving the corrosion resistance of materials based on laser shock peening technology according to claim 1, characterized in that: The material of the constraining layer is K9 glass.

8. The method for improving the corrosion resistance of materials based on laser shock peening technology according to claim 1, characterized in that: The spraying thickness of the constraining layer material is 5 mm.

9. The method for improving the corrosion resistance of materials based on laser shock peening technology according to claim 1, characterized in that: The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

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