Method for effectively inhibiting corrosion of aluminum antenna oscillator and improving passive intermodulation performance

Abstract

The invention discloses a method for effectively inhibiting corrosion of an aluminum antenna oscillator and improving passive intermodulation performance, and relates to the field of material technology application. The surface of the aluminum antenna oscillator is subjected to laser etching, the surface roughness of the aluminum antenna oscillator is regulated, the surface static contact angle of the aluminum antenna oscillator is increased, the surface hydrophobic state of the aluminum antenna oscillator is improved, and therefore the anti-corrosion performance of the aluminum antenna oscillator is enhanced. Regulation and control of the surface appearance of the aluminum antenna oscillator are beneficial to reduction of electric contact nonlinearity of a contact interface, so that the passive intermodulation performance of the aluminum antenna oscillator is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material technology, and particularly relates to a method for effectively inhibiting corrosion of an aluminum antenna element and improving passive intermodulation performance. BACKGROUND

[0002] Passive intermodulation (PIM) refers to a phenomenon that when two or more signals pass through a passive component, intermodulation signals are generated. The passive intermodulation phenomenon exists widely in many passive devices, including coaxial connectors, power dividers, couplers, filters, duplexers / multiplexers and antennas and other communication devices. Unlike active intermodulation, the passive intermodulation generation mechanism is complex, and is easily affected by temperature, pressure, vibration and other factors, and is highly sensitive to the environment, and is difficult to inhibit by conventional technical means. The working environment of the antenna element is difficult to completely isolate from the natural environment, and is easily eroded by wind, rain, sunlight and salt mist, causing material corrosion and structural damage, reducing the service life of the antenna. At the same time, these erosions will affect the conductivity of the antenna element surface and the connecting part, increase the contact nonlinearity, and cause the deterioration of the PIM performance. Once the generated PIM products fall into the receiving passband, the communication quality will be affected, and in severe cases, the communication channel may be directly blocked, causing communication interruption. Therefore, how to effectively inhibit the corrosion of the antenna element and improve its passive intermodulation performance has become a difficult problem that needs to be solved in the development of modern communication technology. SUMMARY

[0003] In order to improve the communication quality and service life of the aluminum antenna element, improve its passive intermodulation and corrosion resistance, the present application reconstructs the surface morphology of the antenna element by laser etching method, obtains a hydrophobic surface with small roughness, effectively inhibits the corrosion of the antenna element and improves its passive intermodulation performance, and provides material support and technical foundation for the practical application of the antenna element in microwave communication electrical contact and structural fixing parts.

[0004] In a first aspect, the present application provides a method for effectively inhibiting corrosion of an aluminum antenna element and improving passive intermodulation performance, which reconstructs the surface morphology of the aluminum antenna element by laser etching method. The surface roughness of the aluminum antenna element after laser etching ranges from 0 to 15 microns, 0 to 50 microns, and the third-order passive intermodulation value is less than or equal to -92.5 dBm. Wherein Ra is the arithmetic mean of the absolute value of the profile offset within the laser etching length; Rz is the difference between the highest peak and the lowest valley of the profile; the surface roughness, hydrophobic state, corrosion performance and passive intermodulation characteristics of the aluminum antenna element are improved.

[0005] Preferably, the aluminum antenna element adopts cast aluminum alloy or deformed aluminum alloy.

[0006] Preferably, the aluminum antenna element adopts 6-series aluminum alloy.

[0007] Preferably, the laser-etched texture is a dot pattern, and the laser line spacing of the texture is 20 μm.

[0008] Preferably, the laser pulse frequency of the laser etching method is 30 kHz.

[0009] Preferably, the laser power of the laser etching method is 4-20W.

[0010] Preferably, the scanning speed of the laser etching method is 500-1500 mm / s.

[0011] In a second aspect, the present invention provides an aluminum antenna vibrator prepared by the method described in the first aspect for effectively suppressing antenna vibrator corrosion and improving passive intermodulation performance.

[0012] In another aspect, the present invention also provides the application of aluminum antenna vibrators as described in the second aspect in high-power communication technology.

[0013] The present invention has the following beneficial effects: This invention uses laser etching to reconstruct the morphology of aluminum antenna elements, thereby obtaining a low-roughness hydrophobic surface. This improves the corrosion resistance of aluminum antenna elements, reduces their electrical contact nonlinearity, extends their service life, and enhances their passive intermodulation performance. Attached Figure Description

[0014] Figure 1 The diagram shows the third-order PIM values ​​of the aluminum antenna vibrator in Embodiments 1-5 and Comparative Example 1 of the present invention. Figure 2 The diagram shows the third-order PIM values ​​of the aluminum antenna vibrator in Embodiments 1 and 6-9 of this invention. Figure 3 This is a comparison diagram showing the potential polarization curves of the aluminum antenna vibrator in Embodiment 1 and Comparative Example 1 of the present invention; Figure 4 This is a comparison chart showing the changes in the third-order PIM value of the aluminum antenna vibrator of Embodiment 1 and Comparative Example 1 after salt spray corrosion. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] Example 1

[0017] An aluminum antenna vibrator made of 6-series aluminum alloy was selected. Its surface was laser-etched to control the surface roughness and increase the static contact angle, resulting in a superhydrophobic surface. This enhanced the corrosion resistance of the aluminum antenna vibrator, improved its surface morphology, reduced contact nonlinearity, and improved its passive intermodulation performance.

[0018] The laser wavelength was 1064nm, the laser etching pattern was dotted, the laser line spacing was 20μm, the laser pulse frequency was 30kHz, the laser etching power was 8W, and the scanning speed was 1000mm / s. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0019] Example 2

[0020] The difference between Example 2 and Example 1 is that the laser power used is 4W, while all other conditions are the same. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0021] Example 3

[0022] The difference between Example 3 and Example 1 is that the laser power used is 12W, while all other conditions are the same. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0023] Example 4

[0024] The difference between Example 4 and Example 1 is that the laser power used is 16W, while all other conditions are the same. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0025] Example 5

[0026] The difference between Example 5 and Example 1 is that the laser power used is 20W, while all other conditions are the same. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0027] Example 6

[0028] The difference between Example 6 and Example 1 is that the scanning speed used is 500 mm / s, while all other conditions are the same. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0029] Example 7

[0030] The difference between Example 7 and Example 1 is that the scanning speed used is 750 mm / s, while all other conditions are the same. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0031] Example 8

[0032] The difference between Example 8 and Example 1 is that the scanning speed used is 1250 mm / s, while all other conditions are the same. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0033] Example 9

[0034] The difference between Example 9 and Example 1 is that the scanning speed used is 1500 mm / s, while all other conditions are the same. The various parameters of the aluminum antenna vibrator obtained are shown in Table 1 below.

[0035] Comparative Example 1 Comparative Example 1 uses an aluminum antenna vibrator made of 6-series aluminum alloy, which is not laser etched.

[0036] The third-order PIM values ​​of the aluminum antenna elements in Examples 1-5 and Comparative Example 1 were tested using a passive intermodulation tester. The test results are as follows: Figure 1 As shown, the third-order PIM value of Comparative Example 1 is -98 dBm, while the third-order PIM values ​​of Examples 1-5 are -120 dBm, -107 dBm, -114 dBm, -105 dBm, and -93 dBm, respectively. This indicates that the optimal laser power is 8 W, and a laser etching power range of 4-16 W can improve the passive intermodulation performance of the aluminum antenna vibrator. However, excessively high laser power will degrade the passive intermodulation performance of the aluminum antenna vibrator.

[0037] The third-order PIM values ​​of the aluminum antenna elements in Examples 1 and 6-9 were tested using a passive intermodulation tester, and the test results are as follows: Figure 2 As shown, the third-order PIM values ​​of Examples 6-9 are -109dBm, -116.7dBm, -114.7dBm, and -112.4dBm, respectively. This indicates that the optimal scanning speed is 1000mm / s, and the passive intermodulation performance of the aluminum antenna vibrator can be improved within a laser scanning speed range of 500-1500mm / s.

[0038]

[0039] As shown in Table 1, the static contact angles of the aluminum antenna vibrators after laser etching are all greater than 100°. Among them, the aluminum antenna vibrator of Example 1 has the largest static contact angle, while the static contact angle of the aluminum antenna vibrators that have not undergone laser etching is smaller. They do not have a superhydrophobic surface, making it difficult to completely isolate them from the natural environment, and they are easily corroded.

[0040] The potentiodynamic polarization curves of the aluminum antenna elements in Comparative Example 1 and Example 1 were tested to compare the corrosion potential and corrosion current density of the two types of aluminum antenna elements. The self-corrosion potential and self-corrosion current density were calculated using the Tafel extrapolation method, and the results are as follows: Figure 3As shown, after laser etching, the self-corrosion potential of the aluminum antenna vibrator significantly increased from -713mV vs. AgCl to -16mV vs. AgCl, indicating a significant reduction in the corrosion tendency of the antenna vibrator. The self-corrosion current density decreased from 10^(-2.93) = 4.95 × 10^24. -3 A*cm -2 Reduced to 10^(-5.30) = 4.99 × 10 -6 A*cm -2 This indicates that the corrosion rate of the antenna vibrator has been significantly reduced.

[0041] Then, using a salt spray corrosion machine, under conditions of 5% NaCl solution, temperature 35℃, and humidity greater than 95%, the aluminum antenna vibrators of Comparative Example 1 and Example 1 were subjected to salt spray corrosion experiments for 1, 3, and 5 days, respectively. Their third-order PIM values ​​were measured using a passive intermodulation tester. The results are as follows: Figure 4 As shown, with increasing corrosion time, the third-order PIM value of the aluminum antenna vibrator without laser etching gradually deteriorates to -70 dBm, while the third-order PIM value of the aluminum antenna vibrator after laser etching can be maintained below -100 dBm. This demonstrates that morphological reconstruction of the aluminum antenna vibrator using laser etching can enhance its corrosion resistance and effectively alleviate the problem of passive intermodulation deterioration caused by corrosion.

[0042] The above description describes specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for effectively suppressing corrosion of aluminum antenna elements and improving passive intermodulation performance, characterized in that: The surface morphology of the aluminum antenna vibrator was reconstructed using laser etching. After laser etching, the static contact angle of the aluminum antenna vibrator was >100°, the surface roughness range was 0 < Ra < 15 μm, 0 < Rz < 50 μm, and the third-order passive intermodulation value was ≤ -92.5 dBm. Ra is the arithmetic mean of the absolute values ​​of the profile offset within the laser etching length, and Rz is the difference between the highest and lowest peaks of the profile.

2. The method for effectively suppressing corrosion of aluminum antenna elements and improving passive intermodulation performance as described in claim 1, characterized in that: The aluminum antenna vibrator is made of cast aluminum alloy or wrought aluminum alloy.

3. The method for effectively suppressing corrosion of aluminum antenna elements and improving passive intermodulation performance as described in claim 2, characterized in that: The aluminum antenna vibrator is made of 6-series aluminum alloy.

4. The method for effectively suppressing corrosion of aluminum antenna elements and improving passive intermodulation performance as described in claim 1, characterized in that: The laser-etched texture is a dot pattern, and the laser line spacing of the texture is 20 μm.

5. The method for effectively suppressing corrosion of aluminum antenna elements and improving passive intermodulation performance as described in claim 1, characterized in that: The laser pulse frequency of the laser etching method is 30kHz.

6. The method for effectively suppressing corrosion of aluminum antenna elements and improving passive intermodulation performance as described in claim 1, characterized in that: The laser power of the laser etching method is 4-20W.

7. The method for effectively suppressing corrosion of aluminum antenna elements and improving passive intermodulation performance as described in claim 1, characterized in that: The scanning speed of the laser etching method is 500-1500 mm / s.

8. An aluminum antenna vibrator, characterized in that: The aluminum antenna vibrator is prepared using the method described in any one of claims 1-6 for effectively suppressing corrosion of the aluminum antenna vibrator and improving passive intermodulation performance.

9. The application of the aluminum antenna vibrator as described in claim 7 in high-power communication technology.

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