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Stripping solution for sintered neodymium-iron-boron surface aluminum coating

A technology of aluminum coating and deplating solution, which is applied in the field of deplating solution, can solve the problems of sintered NdFeB substrate with large damage, defective or waste products, and non-recyclability, etc., to achieve low production cost, improve stability, and quickly Uniform fade effect

Inactive Publication Date: 2010-11-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of aluminum plating on the surface of sintered NdFeB by PVD method, defective products or waste products will inevitably appear. In order to recycle the produced defective products or waste products, it is necessary to remove the aluminum coating
At present, most of the stripping solutions for removing aluminum coatings are aimed at the aluminum coatings on non-metallic surfaces such as glass and plastic products. When this type of stripping solution is used for the aluminum coating on the surface of sintered NdFeB The damage of the substrate is relatively large. When the aluminum coating is removed, the magnetic properties of the sintered NdFeB substrate will be greatly reduced, which will affect its reuse, and even cannot be reused.

Method used

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  • Stripping solution for sintered neodymium-iron-boron surface aluminum coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the solvent of the aluminum coating on the surface of sintered NdFeB is deionized water, and the components and contents of the solute are as follows:

[0021] Sodium hydroxide 20g / L;

[0022] Sodium carbonate 150g / L;

[0023] Complexing agent: sodium tripolyphosphate 4g / L;

[0024] Corrosion inhibitor: triammonium citrate 1g / L;

[0025] Surfactant: sodium dodecylbenzenesulfonate 3g / L.

[0026] Select 20 samples from the magnetic steel and soak them in the deplating solution of this embodiment, the aluminum coating on the surface of the magnetic steel will be removed quickly and evenly, and the deplating will be completed within 1 to 3 minutes, and the samples will be taken out, ultrasonically cleaned and dried as an example Sample 1.

Embodiment 2

[0027] Embodiment 2: the solvent of the aluminum coating on the surface of sintered NdFeB is deionized water, and the components and contents of the solute are as follows:

[0028] Sodium hydroxide 50g / L;

[0029] Sodium carbonate 200g / L;

[0030] Complexing agent: sodium tripolyphosphate 4g / L;

[0031] Corrosion inhibitor: triammonium citrate 3g / L;

[0032] Surfactant: sodium dodecylbenzenesulfonate 4g / L.

[0033] Select 20 samples in the magnetic steel and soak them in the deplating solution of this embodiment, the aluminum coating on the surface of the magnetic steel will be removed quickly and evenly, and the deplating will be completed within 1 to 3 minutes. The samples will be taken out, cleaned with ultrasonic waves, and dried as an implementation. Example sample 2.

Embodiment 3

[0034] Embodiment 3: The solvent of the aluminum coating on the surface of sintered NdFeB is deionized water, and the components and contents of the solute are as follows:

[0035] Sodium hydroxide 30g / L;

[0036] Sodium carbonate 180g / L;

[0037] Complexing agent: sodium citrate 4g / L;

[0038] Corrosion inhibitor: hexamethylenetetramine 2g / L;

[0039] Surfactant: polyethylene glycol 4g / L.

[0040] Select 20 samples in the magnetic steel and soak them in the deplating solution of this embodiment, the aluminum coating on the surface of the magnetic steel will be removed quickly and evenly, and the deplating will be completed within 1 to 3 minutes. The samples will be taken out, cleaned with ultrasonic waves, and dried as an implementation. Example sample 3.

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Abstract

The invention discloses stripping solution for a sintered neodymium-iron-boron surface aluminum coating. The stripping solution comprises sodium hydroxide serving as a corroding agent, sodium carbonate serving as an auxiliary salt, a complexing agent capable of promoting the dissolution of metallic aluminum, a corrosion inhibitor for retarding the corrosion of a matrix, and a surfactant for uniformly dissolving an aluminum coating. Compared with the prior art, the stripping solution for the sintered neodymium-iron-boron surface aluminum coating has the advantages of quickly and uniformly stripping the sintered neodymium-iron-boron surface aluminum coating and simultaneously reducing the damage to the sintered neodymium-iron-boron matrix due to the reasonable design of components and content of the stripping solution; and besides, the stripping solution has the characteristics of low production cost, high stability and long service cycle.

Description

technical field [0001] The invention relates to a deplating solution, in particular to a deplating solution for an aluminum coating on the surface of sintered NdFeB. Background technique [0002] The poor corrosion resistance of NdFeB greatly limits its application. In order to improve the corrosion resistance of NdFeB, it needs to be treated with surface protection. Using physical vapor deposition (PVD) to deposit aluminum coating on the surface of sintered NdFeB is a relatively new surface protection technology. This technology has the advantages of green, pollution-free and good corrosion resistance, so it is more and more favored by people. However, in the process of aluminum-coating the surface of sintered NdFeB by PVD method, defective or waste products will inevitably appear. In order to recycle the generated defective or waste products, the aluminum coating needs to be removed. At present, most of the stripping solutions for removing aluminum coatings are aimed at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/36C23F1/44
Inventor 宋振纶胡依群王大亮冒守栋
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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