Method for cleaning cadmium coating on surface of workpiece through laser and laser cleaning device

A technology for laser cleaning and workpiece surface application in the field of laser cleaning of cadmium coating on the surface of workpieces and laser cleaning devices can solve the problems of unusable and undisclosed laser cleaning of cadmium coating workpieces, high-strength steel cannot be in contact with acidic solutions, etc., to achieve Simple operation and improved cleaning efficiency

Inactive Publication Date: 2022-01-04
XIAN AIRCRAFT IND GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned cadmium coating removal method has the following defects: (1) the chemical method and the electrolytic method need to put the whole part into the deplating tank, which is only applicable to detachable parts and cannot be implemented for large-scale products or structural parts; (2) ) in cadmium is a highly toxic substance, cadmium-containing waste water is strictly controlled by environmental protection policies, and the cadmium-containing deplating solution needs to be treated in sewage to be discharged when the cadmium content is lower than the monitoring index; (3) the high-strength steel commonly used in structural parts cannot be used with Contact with acidic solution and cannot use acidic chemical stripping solution to prevent the mechanical impact of hydrogen embrittlement on structural strength
[0004] Also do not disclose the scheme of laser cleaning the workpiece with cadmium coating in the prior art at present

Method used

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  • Method for cleaning cadmium coating on surface of workpiece through laser and laser cleaning device
  • Method for cleaning cadmium coating on surface of workpiece through laser and laser cleaning device
  • Method for cleaning cadmium coating on surface of workpiece through laser and laser cleaning device

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Embodiment 1

[0025] This embodiment provides a method for laser cleaning the cadmium coating on the surface of a workpiece. Specifically, it adopts a laser output power of 50W, a laser output repetition frequency of 100kHz, a laser pulse width of 12ns, and a laser spot overlap rate of 10%. The single pulse energy is 0.5mJ, the laser scanning speed is 3500mm / s, and the filling spacing (that is, the distance between the centers of two adjacent laser spots in the same laser scanning direction) is 0.05mm. The cadmium coating on the surface of the workpiece is laser cleaned, and the cadmium There is a layer of yellow-green passivation layer on the surface of the coating, and the main element is chromium. At the same time, the number of times of laser scanning, that is, laser cleaning is 9 times.

[0026] In this embodiment, the workpiece is a steel workpiece, which includes a substrate, a cadmium coating, and a passivation layer on the surface of the cadmium coating, wherein the thickness of the...

Embodiment 2

[0028] The difference between this embodiment and Embodiment 1 is that the laser parameters are: laser output power of 100W, laser output repetition frequency of 1000kHz, laser pulse width of 500ns, laser spot overlapping rate of 30%, laser single pulse energy 0.1mJ, the laser scanning speed is 2500mm / s, the laser cleaning workpiece surface cadmium coating is 0.01mm, and the surface of the cadmium coating has a layer of yellow-green passivation layer, the main element is chromium. At the same time, the laser scanning is The number of times of laser cleaning is 10 times.

Embodiment 3

[0030] The difference between this embodiment and Embodiment 1 is that the laser parameters are: laser output power of 30W, laser output repetition frequency of 100kHz, laser pulse width of 100ns, laser spot overlapping rate of 50%, laser single pulse energy The laser scanning speed is 0.3mJ, the laser scanning speed is 2500mm / s, the filling pitch is 0.045mm, and the laser cleaning times are 8 times.

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Abstract

The invention discloses a method for cleaning a cadmium coating on the surface of a workpiece through laser and a laser cleaning device. The cadmium coating on the surface of the workpiece is cleaned through the laser with the laser output power smaller than or equal to 100 W, the laser output repetition frequency ranging from 100 kHz to 1000 kHz, the laser pulse width ranging from 12 ns to 500 ns, the laser spot overlap rate smaller than or equal to 50% and the laser single pulse energy smaller than or equal to 0.5 mJ, and the number of laser cleaning times is larger than or equal to 8. The method can be used for fully cleaning the cadmium coating on the surface layer of the workpiece without causing an overburning phenomenon on the workpiece.

Description

technical field [0001] The invention relates to the field of laser cleaning, in particular to a method for laser cleaning a cadmium coating on the surface of a workpiece and a laser cleaning device. Background technique [0002] Cadmium plating is a commonly used protective coating, which plays a role in corrosion protection for metal substrates. Cadmium plating is also the main process for corrosion protection of aircraft and ships in marine environments, and is widely used in key structural parts. However, under extreme conditions, the cadmium coating will be damaged or fail, such as mechanical damage, potential corrosion of dissimilar metals, and cadmium plating is used as an anodic coating to corrode and consume in order to protect the metal base material from damage in harsh environments. [0003] When the cadmium coating is damaged, its corrosion protection performance decreases or fails, and it is necessary to maintain the cadmium coating regularly to restore its corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B7/00
CPCB08B7/0042
Inventor 赵安安王浩军王叶成书民孟保利张海宝
Owner XIAN AIRCRAFT IND GROUP
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