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Method and Application of Improving the Performance of Material Surface Modification Layer

A surface modification layer and performance technology, applied in the field of surface modification of materials, can solve the problems of weak weather resistance and wear resistance, poor bonding force, not yet suitable for practical use, etc., to achieve dense film layer and enhance bonding force , Improve the effect of binding force and wear resistance

Active Publication Date: 2017-12-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the single zinc-chromium film formed by zinc-chromium film coating technology has poor bonding force with the substrate, and its weather resistance and wear resistance are also weaker than traditional coatings.
In addition, there are few reports on the application of zinc-chromium film coating technology in the anti-corrosion application of NdFeB magnets, and it has not yet been adapted to practical application.

Method used

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  • Method and Application of Improving the Performance of Material Surface Modification Layer
  • Method and Application of Improving the Performance of Material Surface Modification Layer
  • Method and Application of Improving the Performance of Material Surface Modification Layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] (1) Nd, B, Co, Cu, Al, Zr, Fe raw materials according to mole percentage Nd 25.8%, B 0.98%, Co1%, Cu0.27%, Al 0.18%, Zr 0.4%, Febal ratio, alloy The total mass is 5kg, and put into the vacuum induction melting furnace at the same time, through the process of charging - vacuuming - preheating - argon filling - high power smelting - low power stirring - casting and other processes, the smelted alloy liquid (copper rollers are refrigerated Water cooling, the speed is about 35-50 rpm) to make thin slices with a thickness of about 0.3-0.4mm and good crystallization, and select alloy quick-setting sheets with smooth performance, uniform thickness, and bright white color to prepare powder for use.

[0095] (2) Put the selected quick-setting tablets into the special hydrogen crushing furnace, and carry out coarse crushing through positive and negative pressure detection-hydrogen absorption-heating-vacuum dehydrogenation-cooling-out of the furnace, etc. In nitrogen-protected glo...

Embodiment 2

[0109] Steps (1)~(5) are identical with steps (1)~(5) in embodiment 1;

[0110] The difference is as follows:

[0111] (6) Use gasoline and a NaOH solution with a concentration of 2mol / L to remove the oil stains on the surface of the small cylinder successively, and then place it in a sandblasting machine for surface derusting and descaling treatment (the diameter of the steel shot is: 0.1~ 0.3mm, sandblasting time: 20 minutes). Afterwards, the surface of the small cylinder is polished on a cylindrical grinder (polishing time: 30 minutes), and finally the polished small cylinder is placed in a mixture of absolute ethanol and acetone, and the surface of the magnet is further decontaminated under the action of ultrasonic waves Processing (ultrasonic frequency: 100 Hz, cleaning time: 10 minutes), take out the small cylinder and let it dry naturally at room temperature for later use.

[0112] (7) While cleaning the surface of the magnet, get sodium silicate and add zinc silicate...

Embodiment 3

[0118] Steps (1)~(5) are identical with steps (1)~(5) in embodiment 2;

[0119] (6) Use gasoline and NaOH solution with a concentration of 2% to remove the oil stains on the surface of the small cylinder after slicing, and then place it in the sandblasting machine for surface derusting and descaling treatment (the diameter of the steel shot is: 0.1 to 0.3 mm, sandblasting time: 30 minutes). Afterwards, the surface of the small cylinder is polished on a cylindrical grinder (polishing time: 40 minutes), and finally the polished small cylinder is placed in a mixture of absolute ethanol and acetone, and the surface of the magnet is further decontaminated under the action of ultrasonic waves Processing (ultrasonic frequency: 100 Hz, cleaning time: 20 minutes), take out the small cylinder and let it dry naturally at room temperature for later use.

[0120] (7) While cleaning the surface of the magnet, get sodium water glass and add zinc silicate to fully mix (zinc silicate accounts...

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Abstract

The invention discloses a method for improving the performance of a material surface modification layer and an application thereof. The method for improving the performance of the material surface modification layer comprises: coating an inorganic zinc-rich silica sol on the surface of the material to be treated to form a primer layer, and coating a zinc-chromium coating solution on the primer layer to form a zinc-chromium film; The inorganic zinc-rich silica sol contains soluble alkali metal silicate materials, inorganic gel and ultrafine zinc powder, and the zinc-chromium coating solution includes flake zinc powder, aluminum powder, chromic anhydride, boric acid, surfactant, etc. . The invention provides a method capable of effectively improving the performance of the material surface modification layer, which has simple process, easy regulation, low cost, no pollution, safety and environmental protection, and is especially suitable for neodymium obtained by various grades and various preparation methods The protection treatment of the iron-boron permanent magnet has broad application prospects in the protection of magnetic materials; and the surface modification coating formed by the method of the invention has excellent comprehensive performance.

Description

technical field [0001] The invention relates to a material surface treatment technology, in particular to a method for improving the comprehensive performance of a rare earth permanent magnet material, such as a surface protection layer of an NdFeB magnet, and belongs to the technical field of material surface modification. Background technique [0002] NdFeB permanent magnet materials have been widely used in voice coil motors, magnetic resonance imaging, general motors, generators, sensors, instruments and other fields due to their excellent magnetic properties. However, the poor corrosion resistance of NdFeB itself has seriously affected its application, so the research on the corrosion resistance of NdFeB is of great significance. Although many protection methods for NdFeB magnets have been developed at present, sintered NdFeB magnets have a large number of pores, and acid and plating solutions are easy to remain, resulting in long-term corrosion of magnets and coatings....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/76C23C22/82C09D1/00
CPCC09D1/00C09D5/10C23C24/00C23C28/00
Inventor 周巧英郭帅闫阿儒李东
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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