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Process for preparing Ni-Cr corrosion-resistant alloy coating on surface of sintered NdFeB magnet

A corrosion-resistant alloy and alloy coating technology, which is applied in the field of corrosion-resistant coatings and magnetic material surface protection, can solve the problems of poor corrosion resistance of sintered NdFeB magnets, and achieve good corrosion resistance, high bonding strength, and long-term corrosion protection. Effect

Active Publication Date: 2021-01-29
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of poor corrosion resistance of sintered NdFeB magnets, the present invention provides a preparation process for Ni-Cr corrosion-resistant alloy coating on the surface of sintered NdFeB magnets, using double-glow plasma Surface metallurgy technology develops Ni-Cr corrosion-resistant alloy coating on the surface of sintered NdFeB magnets, so that it has high adhesion and corrosion resistance, and achieves greater economic and social benefits

Method used

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  • Process for preparing Ni-Cr corrosion-resistant alloy coating on surface of sintered NdFeB magnet
  • Process for preparing Ni-Cr corrosion-resistant alloy coating on surface of sintered NdFeB magnet
  • Process for preparing Ni-Cr corrosion-resistant alloy coating on surface of sintered NdFeB magnet

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Embodiment 1

[0026] A preferred preparation method of the present invention is as follows:

[0027] (1) Four Ni-Cr alloy plates are used to form a grid-shaped target. The size of the Ni-Cr alloy plates is 80 mm × 20 mm × 5 mm, and the distance between each Ni-Cr alloy plate is 10 mm. The composition ratio of the Ni-Cr alloy target is: the atomic percentage of Ni in the Ni-Cr alloy target is 80 at.%, and the atomic ratio of Cr in the Ni-Cr alloy target is 20 at.%.

[0028] (2) The base material is a sintered NdFeB magnet with a size of 15 mm × 15 mm × 5 mm. Before surface treatment, first use 0#, 1#, 3#, 4#, 5# metallographic sandpaper to polish, then polish with 2.5 μm diamond abrasive paste, then ultrasonically clean with acetone solution, and dry for later use .

[0029] (3) The surface of the sintered NdFeB magnet was cleaned by plasma etching. The process parameters were: voltage 600V, current 1 A, argon pressure 50 Pa, and time 0.5 h.

[0030] (4) Using the double-glow plasma surfa...

Embodiment 2

[0038] Another preferred preparation method of the present invention is as follows:

[0039] (1) A Ni-Cr alloy target with a diameter of 100 mm is used. The composition ratio of the Ni-Cr alloy target used is: the atomic percentage of Ni in the Ni-Cr alloy target is 80 at.%, Cr in Ni The atomic ratio of the -Cr alloy target is 20 at.%.

[0040] (2) The base material is a sintered NdFeB magnet with a size of 15 mm × 15 mm × 5 mm. Before surface treatment, first use 0#, 1#, 3#, 4#, 5# metallographic sandpaper to polish, then polish with 2.5 μm diamond abrasive paste, then ultrasonically clean with acetone solution, and dry for later use .

[0041] (3) The surface of the sintered NdFeB magnet was cleaned by plasma etching. The process parameters were: voltage 600V, current 1 A, argon pressure 50 Pa, and time 0.5 h.

[0042] (4) Using the double-glow plasma surface metallurgy technology, using the Ni-Cr alloy target as the source, and the sintered NdFeB magnet as the workpiece po...

Embodiment 3

[0045] The present invention also has a preferred preparation method as follows:

[0046] (1) Four Ni-Cr alloy plates are used to form a grid-shaped target. The size of the Ni-Cr alloy plates is 80 mm × 20 mm × 5 mm, and the distance between each Ni-Cr alloy plate is 10 mm. The composition ratio of the Ni-Cr alloy target: the atomic percentage of Ni in the Ni-Cr alloy target is 80 at.%, and the atomic ratio of Cr in the Ni-Cr alloy target is 20 at.%.

[0047] (2) The base material is a sintered NdFeB magnet with a size of 15 mm × 15 mm × 5 mm. Before surface treatment, first use 0#, 1#, 3#, 4#, 5# metallographic sandpaper to polish, then polish with 2.5 μm diamond abrasive paste, then ultrasonically clean with acetone solution, and dry for later use .

[0048] (3) The surface of the sintered NdFeB magnet was cleaned by plasma etching. The process parameters were: voltage 600V, current 1 A, argon pressure 50 Pa, and time 0.5 h.

[0049] (4) Using the double-glow plasma surfa...

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Abstract

The invention discloses a process for preparing a Ni-Cr corrosion-resistant alloy coating on the surface of a sintered NdFeB magnet. The process comprises the following steps of: carrying out surfacepretreatment on the surface of the sintered NdFeB magnet by adopting a plasma etching technology; carrying out double-glow plasma Ni-Cr alloying treatment on the surface of the sintered NdFeB magnet to prepare a Ni-Cr alloy coating; and carrying out surface micro-nano structure construction on the prepared Ni-Cr alloy coating by using the plasma etching technology. According to the Ni-Cr corrosion-resistant alloy coating on the surface of the sintered NdFeB magnet prepared by the method, the internal structure components are in gradient distribution, the contents of Ni and Cr are gradually reduced from outside to inside, a mutual diffusion phenomenon exists in the interface of the Ni-Cr corrosion-resistant alloy coating and a substrate, and the coating and the substrate are metallurgicallybonded, so that the bonding strength is high; and the coating is compact in structure and the main component is nickel-based alloy, so that the corrosion resistance is good, and longer corrosion protection can be provided for the sintered NdFeB magnet.

Description

technical field [0001] The invention belongs to the field of magnetic material surface protection and corrosion-resistant coatings, and in particular relates to a preparation process of a Ni-Cr corrosion-resistant alloy coating on the surface of a sintered NdFeB magnet. Background technique [0002] As the third-generation rare earth permanent magnet material, sintered NdFeB magnet has the characteristics of excellent coercive force, high remanence and high magnetic energy product, etc. It has been widely used in the field and has become an important basic functional material for the development of industrial science and technology. Sintered NdFeB magnets mainly contain Nd 2 Fe 14 B main crystal phase and grain boundary Nd-rich phase, but the chemical activity of Nd element is very high, and it is easy to react in corrosive medium, which seriously affects its oxidation resistance and corrosion resistance, which greatly limits the application of sintered NdFeB magnets. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/38C23C14/02C23C14/16C23C14/58C22C19/05
CPCC23C14/3478C23C14/022C23C14/165C22C19/058C23C14/5826
Inventor 黄俊徐吉林崔世宇张剑平罗军明杨思雨孙宇航
Owner NANCHANG HANGKONG UNIVERSITY