Stripping solution and method for stripping nitride film layer on cobalt-based hard alloy surface

A technology of cobalt-based hard alloy and nitride film, which is applied in the field of metal surface treatment, can solve the problems of easy decomposition, difficult to accurately control the concentration, and danger in the storage and transportation process, and achieve the effect of effective removal and reduction of damage

Active Publication Date: 2020-08-28
SUZHOU CHAMPION COATING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unstable chemical properties of hydrogen peroxide itself, it is easy to decompose after being heated or shaken. It is difficult to accurately control the concentration when using hydrogen peroxide to prepare the film removal solution, and there are dangers in the storage and transportation process.
[0006] The chemical film removal process generally involves immersing the entire mold in the film removal solution. However, most of the film layer only exists on the surface of the inner cavity of the mold, so the area of ​​the mold surface that is not covered with the film layer is also exposed to the film removal solution during the film removal process. , while causing the waste of film-removing liquid, it will damage the surface of the mold that is not covered with the film layer, and increase the cost of mold cleaning after film-removing

Method used

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  • Stripping solution and method for stripping nitride film layer on cobalt-based hard alloy surface
  • Stripping solution and method for stripping nitride film layer on cobalt-based hard alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepare the membrane-removing solution, the membrane-removing solution is composed of: 100 parts of sodium hydroxide, 1000 parts of sodium percarbonate, 10 parts of tetrasodium iminodisuccinate, 6 parts of sodium lignosulfonate, 0.015 parts of graphene oxide powder, iso 36 parts of propanol, 147 parts of ethanol, and 815 parts of deionized water. The stripping solution was prepared at a temperature of 15°C, and after the preparation was completed, it was stirred rapidly at a temperature of 15°C for 18 hours.

[0035] Put bucky paper in 1mol·L -1 The constant potential cathodic polarization treatment is carried out in the sodium hydroxide solution, the bucky paper is the cathode, the carbon rod is the anode, the distance between the cathode and the anode is 3cm, the voltage between the cathode and the anode is 1.8V, and the temperature is 25°C , and the treatment time was 20s. After cathodic polarization, the bucky paper was washed in deionized water and ethanol respect...

Embodiment 2

[0041] Prepare the film-removing solution, which consists of 128 parts of sodium hydroxide, 1382 parts of sodium percarbonate, 16 parts of tetrasodium iminodisuccinate, 8 parts of sodium lignosulfonate, 0.015 parts of graphene oxide powder, iso 60 parts of propanol, 165 parts of ethanol, and 715 parts of deionized water. The stripping solution was prepared at a temperature of 15°C, and after the preparation was completed, it was stirred rapidly at a temperature of 15°C for 18 hours.

[0042] According to the method of Example 1, the bucky paper was subjected to constant potential cathodic polarization treatment, washed and dried.

[0043] According to the method of Example 1, the bucky paper after the constant potential cathodic polarization treatment was soaked in the film-removing solution.

[0044] According to the method of Example 1, the cobalt-based cemented carbide samples with CrN, TiN, (Ti, Cr)N and (Ti, Al, Cr)N film layers formed on the surface are contacted with t...

Embodiment 3

[0048] According to the method of Example 1, the membrane-removing solution was prepared.

[0049] Put bucky paper in 1mol·L -1 The constant potential cathodic polarization treatment was carried out in the sodium hydroxide solution, the bucky paper was the cathode, the carbon rod was the anode, the distance between the cathode and the anode was 2cm, the voltage between the cathode and the anode was 2V, and the temperature was 35°C. The treatment time is 15s. After the cathodic polarization is completed, the bucky paper is washed in deionized water and ethanol respectively, and then dried in a vacuum drying oven.

[0050] According to the method of Example 1, the bucky paper after the constant potential cathodic polarization treatment was soaked in the film-removing solution.

[0051] According to the method of Example 1, the cobalt-based cemented carbide samples with CrN, TiN, (Ti, Cr)N and (Ti, Al, Cr)N film layers formed on the surface are contacted with the ultrasonic vibr...

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PUM

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Abstract

The invention discloses a film removing liquid and method for removing a nitride film layer on the surface of a cobalt-based hard alloy. The film removing liquid does not contain substances such as permanganate, chlorate or hydrogen peroxide, and is composed of sodium hydroxide, sodium percarbonate, tetrasodium iminodisuccinate, sodium lignin sulfonate, graphene oxide powder, isopropanol, ethanol,and deionized water, wherein the deionized water is used as a solvent. According to the film removing liquid, a buckypaper subjected to constant potential cathode polarization treatment is used as aflexible carrier of the film removing liquid, in the film removing process, only the buckypaper absorbing the film removing liquid needs to be used for covering the surface of the nitride film layer,ultrasonic vibration is combined, effective removal of the nitride film layer can be realized, and the damage on the base body cobalt-based hard alloy is extremely weak in the film removing process.

Description

technical field [0001] The invention relates to a film-removing solution and a method for removing a nitride film layer on the surface of a cobalt-based hard alloy, and belongs to the technical field of metal surface treatment. Background technique [0002] Cobalt-based cemented carbide is an alloy material composed of cobalt as the main component, containing a considerable amount of nickel, chromium, tungsten, and a small amount of alloying elements such as molybdenum, niobium, tantalum, titanium, and lanthanum. This material is resistant to wear and corrosion. And high-temperature oxidized cemented carbide, so cobalt-based cemented carbide is often used in the manufacture of various molds. During the use of the mold, in order to protect the mold base and effectively prolong the working life of the mold, it is necessary to improve the mechanical properties, friction and wear properties, and high temperature oxidation resistance of the inner cavity surface of the mold. Usin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/20B08B7/02
CPCB08B7/028C23G1/20
Inventor 陈君乐务时
Owner SUZHOU CHAMPION COATING TECH
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