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Chemical corrosion method for removing hard phases on surface of hard alloys

A cemented carbide and chemical corrosion technology, applied in the field of cemented carbide, can solve the problems of easy-to-corrosion WC corrosion binder phase, difficult control of electrolytic parameters, quantitative measurement errors, etc., to achieve convenient preparation, easy popularization and application, and high accuracy Effect

Active Publication Date: 2019-04-05
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It has been reported at home and abroad that the electrolytic corrosion method is used to selectively corrode the WC phase. This method can realize the removal of WC on the surface of the cemented carbide and avoid the interference of WC on the measurement. However, for technicians, this method requires additional electrolysis. The device is complicated to operate, and the parameters of electrolysis are not easy to control. If it is not properly controlled, it is easy to corrode WC and corrode the binder phase at the same time or the corrosion efficiency is low.
During the electrolysis process, a large amount of heat will be generated to oxidize the binder phase, resulting in errors in quantitative measurement

Method used

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  • Chemical corrosion method for removing hard phases on surface of hard alloys
  • Chemical corrosion method for removing hard phases on surface of hard alloys
  • Chemical corrosion method for removing hard phases on surface of hard alloys

Examples

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Effect test

Embodiment 1

[0036] A chemical corrosion method for removing the hard phase on the surface of the cemented carbide. In this embodiment, a WC-Fe-Ni cemented carbide with a binder phase content of 10 wt.% is selected, and the steps are as follows:

[0037] (1) Use 180#, 400#, 800#, 1000#, 2000# diamond grinding discs to polish on the polishing machine, and then use 0.5μm diamond polishing paste to polish the cemented carbide surface into a mirror surface, and then clean it with water , Blow dry;

[0038] (2) Dissolve 1.0 g potassium ferricyanide and 15.2 g sodium hydroxide per 100 mL of distilled water, mix and stir to prepare the corrosive solution, ready to use; put the polished cemented carbide into the corroded Immediately proceed to the next step in the liquid;

[0039] (3) Ultrasonic vibration treatment for 20 minutes;

[0040] (4) Turn off the ultrasound and let it stand for 130min at room temperature in a shading environment;

[0041] (5) Repeat steps (3) and (4) 4 times;

[0042] (6) Remove ...

Embodiment 2

[0045] A chemical corrosion method for removing the hard phase on the surface of cemented carbide. In this embodiment, a WC-Fe-Ni cemented carbide with a binder phase content of 20 wt.% is selected, and the steps are as follows:

[0046] (1) Use 180#, 400#, 800#, 1000#, 2000# diamond grinding discs to polish on the polishing machine, and then use 0.5μm diamond polishing paste to polish the cemented carbide surface into a mirror surface, and then clean it with water , Blow dry;

[0047] (2) Dissolve 0.8 g potassium ferricyanide and 10.2 g sodium hydroxide per 100 mL of distilled water, mix and stir to prepare the corrosive solution, ready to use; put the polished cemented carbide into the corroded Immediately proceed to the next step in the liquid;

[0048] (3) Ultrasonic vibration treatment for 15 minutes;

[0049] (4) Turn off the ultrasound and let it stand for 105min at room temperature in a shading environment;

[0050] (5) Repeat steps (3) and (4) 4 times;

[0051] (6) Remove the ...

Embodiment 3

[0054] A chemical corrosion method for removing the hard phase on the surface of the cemented carbide. In this embodiment, a WC-Fe-Ni cemented carbide with a binder phase content of 30wt.% is selected, and the steps are as follows:

[0055] (1) Use 180#, 400#, 800#, 1000#, 2000# diamond grinding discs to polish on the polishing machine, and then use 0.5μm diamond polishing paste to polish the cemented carbide surface into a mirror surface, and then clean it with water , Blow dry;

[0056] (2) Dissolve 0.4g potassium ferricyanide and 9.2g sodium hydroxide per 100 mL of distilled water, mix and stir to prepare the corrosive solution, ready to use; put the polished cemented carbide into the corrosion Immediately proceed to the next step in the liquid;

[0057] (3) Ultrasonic vibration treatment for 10 minutes;

[0058] (4) Turn off the ultrasound and let it stand for 90 minutes at room temperature in a shading environment;

[0059] (5) Repeat steps (3) and (4) 3 times;

[0060] (6) Remove...

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Abstract

The invention belongs to the technical field of hard alloys, and discloses a chemical corrosion method for removing hard phases on the surface of hard alloys. The method comprises the following steps:(1) the hard alloys are polished, and then, are cleaned and dried; (2) corrosion liquid is prepared according to a ratio of dissolving 0.2-1.1 g potassium ferricyanide and 5-19.8 g sodium hydroxide in every 100 mL water; and the polished hard alloys are fed in the corrosion liquid for next treatment; (3) the ultrasonic oscillation is performed by 5-30 min; (4) ultrasonic waves are turned off; andthe hard alloys are stood in a light shielding environment at a normal temperature for 30-180 min; (5) the steps (3) and (4) are repeated by 3-8 times; and (6) the hard alloys are taken out from thecorrosion liquid to put in water for ultrasonic cleaning by 1-8 min; and the surfaces of the hard alloys are dried after cleaning. The corrosion process of combining chemical corrosion with ultrasonicoscillation is adopted; WC phases on the surfaces of the alloys are thoroughly corroded; no WC is remained on the surfaces of the alloys; and bonding phases cannot be oxidized.

Description

Technical field [0001] The invention belongs to the technical field of hard alloys, and specifically relates to a chemical corrosion method for removing hard phases on the surface of hard alloys. Background technique [0002] The mechanical properties of cemented carbide are closely related to the structure of the binder phase and the solubility of W in the binder phase. Quantitative analysis of the phase structure of the binder phase and the solubility of W in the binder phase can provide a scientific explanation for the changes in the performance of cemented carbide products, and provide a theoretical basis for the adjustment of cemented carbide composition and sintering process, and the formulation of subsequent heat treatment processes. guide. [0003] Due to the unique structure of cemented carbide, the WC phase is uniformly covered by the binder phase, and the thickness of the binder phase is usually between 0.2-5μm. Due to the presence of the WC phase on the alloy surface,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/40G01N23/20091G01N23/20G01N1/32
CPCC23F1/40G01N1/32G01N23/20G01N23/20091
Inventor 高阳郭晓琴高卡张锐樊磊关莉
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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