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Method for improving corrosion resistance of magnesium alloy surface through short-pulse laser

A short-pulse laser and corrosion-resistant technology, which is applied in the field of short-pulse laser to improve the corrosion resistance of magnesium alloy surfaces, can solve the problems of large thermal impact and affect the performance of metal substrates, achieve small thermal impact, improve production efficiency, and improve processing speed. quick effect

Inactive Publication Date: 2017-09-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing laser remelting treatment technology has a large thermal impact on the matrix material outside the remelted layer metal, which affects the performance of the metal matrix

Method used

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  • Method for improving corrosion resistance of magnesium alloy surface through short-pulse laser
  • Method for improving corrosion resistance of magnesium alloy surface through short-pulse laser
  • Method for improving corrosion resistance of magnesium alloy surface through short-pulse laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Take a Mg-Gd-Ca magnesium alloy block with a thickness of 5 mm, polish it with sandpaper to remove the oxide film on the processed surface, and place it in anhydrous acetone for cleaning.

[0036] (2) Put the sample in such as figure 2 The nanosecond laser processing system of SPI company shown (using 1060nm wavelength of CO 2 On the workbench of the laser), set the laser power to 70W, the frequency to 500kHz, the scanning speed to 200mm / s, set the scanning area size to 10mm×10mm, adjust the spot overlap rate to 20%, and start the laser processing system to start processing.

[0037] (3) Remove the processed magnesium alloy block from the workbench and wipe it with absolute alcohol.

[0038] Such as image 3 Shown is the metallography of the longitudinal section near the surface of the Mg-Gd-Ca magnesium alloy obtained after processing in Example 1. As shown in the figure, there is a remelted layer with a thickness of about 20 μm on the metal surface after short-...

Embodiment 2

[0040] (1) Take a Mg-Gd-Ca magnesium alloy block with a thickness of 5mm, sand it to remove the oxide film on the processed surface, and place it in anhydrous acetone for cleaning.

[0041] (2) Put the sample in such as figure 2 On the workbench of the nanosecond laser processing system of SPI Company shown (using a CO2 laser with a wavelength of 1060nm), the laser power is set to 80W, the frequency is 500kHz, the scanning speed is 50mm / s, and the scanning area is set to 10mm×10mm. The spot overlap rate is adjusted to 40%, and the laser processing system is started to start processing.

[0042] (3) Remove the processed magnesium alloy block from the workbench and wipe it with absolute alcohol.

[0043] Such as Figure 5 Shown is the electrode polarization curve of the Mg-Gd-Ca magnesium alloy obtained after processing in Example 2 and the untreated sample. As shown in the figure, the self-corrosion potential of the alloy after remelting is improved relative to the untreated...

Embodiment 3

[0045] (1) Take a ZK60 magnesium alloy block with a thickness of 5mm, sand it to remove the oxide film on the processed surface, and place it in anhydrous acetone for cleaning.

[0046] (2) Put the sample in such as figure 2On the workbench of the nanosecond laser processing system of SPI Company shown (using a CO2 laser with a wavelength of 1060nm), the laser power is set to 120W, the frequency is 20kHz, the scanning speed is 50mm / s, and the scanning area is set to 10mm×10mm. The spot overlap rate is adjusted to 50%, and the laser processing system is started to start processing.

[0047] (3) Remove the processed magnesium alloy block from the workbench and wipe it with absolute alcohol.

[0048] Such as Figure 6 Shown is the electrode polarization curve of the ZK60 magnesium alloy obtained after processing in Example 3 and the untreated sample. As shown in the figure, the self-corrosion potential of the alloy after remelting is improved compared with the untreated sample...

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Abstract

The invention relates to a method for improving corrosion resistance of the magnesium alloy surface through a short-pulse laser. The method comprises the steps that (1), a magnesium alloy material is subjected to sand papering to remove an oxidation layer and then subjected to acetone cleaning to remove oil; (2), the cleaned magnesium material is placed on a worktable of a nanosecond laser machining system, laser parameters are set, the laser machining system is started, the laser is made to scan on the surface of the magnesium alloy material in a certain speed through galvanometer scanning, and a remelting layer is obtained on the surface of the magnesium alloy material; and (3), the machined metal material is cleaned simply. According to the method for improving corrosion resistance of the magnesium alloy surface through the short-pulse laser, a laser direct writing system is utilized, and by changing the laser parameters such as the frequency, the scanning speed and the power, the fused depth, the area and the like of the metal surface can be controlled precisely; a chemical reagent does not need to be added additionally, so that environment protecting is achieved; arbitrary set of a machining area can be achieved; the machining speed is higher, and the production efficiency is improved; and the short-pulse laser with the low power is used, so that the situation that metal matrix performance remains unchanged is facilitated.

Description

technical field [0001] The invention relates to a method for improving the corrosion resistance of magnesium alloy surface by short pulse laser. This method can be widely applied to the surface treatment of magnesium alloy materials, and the metal surface with better corrosion resistance can be quickly obtained by laser remelting treatment. Background technique [0002] Magnesium alloys have the advantages of low density, high specific strength and specific stiffness, easy processing, and abundant resources. They have broad application prospects in the fields of automobiles, electronics, and aerospace. However, the electrode potential of magnesium alloy is low, easy to corrode, and poor corrosion resistance is one of the main bottlenecks hindering the popularization and application of magnesium alloy. At present, no effective alloying method has been found to improve the corrosion resistance of magnesium alloys. To improve its corrosion resistance, surface treatment technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 管迎春聂世琳
Owner BEIHANG UNIV
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