CN103911624A - Method for removing chromium nitride coating on surface of mould - Google Patents
Method for removing chromium nitride coating on surface of mould Download PDFInfo
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- CN103911624A CN103911624A CN201410176240.7A CN201410176240A CN103911624A CN 103911624 A CN103911624 A CN 103911624A CN 201410176240 A CN201410176240 A CN 201410176240A CN 103911624 A CN103911624 A CN 103911624A
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- Prior art keywords
- chromium nitride
- mould
- nitride coating
- potassium permanganate
- sodium hydroxide
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a method for removing a chromium nitride coating on the surface of a mould. The method comprises the following steps: contacting the mould with a chemical solution, and reacting at constant temperature of 70 DEG C until the chromium nitride coating is removed completely, wherein the surface of the mould is swept every 30 minutes to get rid of the removed chromium nitride coating; a preparation method of the chemical solution comprises the following steps: heating water to 70 DEG C, adding potassium permanganate and sodium hydroxide, and stirring evenly; the weight ratio of sodium hydroxide to potassium permanganate to water is 1:5:200. By utilizing strong oxidizing property of potassium permanganate and strong corrosivity of sodium hydroxide, the method can completely remove the CrN coating on the surface of the mould, and the removal time is short and only 4-6 hours, so that the efficiency is greatly improved. In addition, the removal cost is also greatly reduced to only about 500 Yuan, so that large-scale production becomes possible.
Description
Technical field
The present invention relates to a kind of method of removing die surface chromium nitride coating.
Background technology
Because physical vapor deposition can deposit and obtain finer and close coating compared with chemical vapour deposition, more and more paid attention in recent years, be used for improving chemistry and the mechanical property of material.This technology is widely used in various coatings, thereby and nitride and carbide are widely used in cutter and forming mould owing to having high wear resistance and chemical stability.In these coatings, have CrN coating only owing to thering is good thermostability, lower depositing temperature, good wear resisting property and bonding strength, thus obtain too special application in field of machining; Such as, in injection molding part, use after CrN coating, significantly improve the work-ing life of this part.But, in the time that this type of expensive utensil needs repairing (such as, when the cutting edge of apparatus need to be polished again) just need to peel off all coatings, and then new hard coat is applied up; Similarly, when found defect in this coating after, also need this hard coat to peel off again and apply, to reach the requirement without any defect.In this case, in cutting and shaping industrial production, just require to find a kind of good technology in order to peel off this kind of hard coat, have significant economic benefit because peel off again coating processes for repairing old part.For industrial practical, hard coat stripping technology must be simple, efficient, cheap, can not destroy body material simultaneously.
Potassium permanganate, molecular formula is KMnO
4, due to its stronger oxidisability, potassium permanganate heating can be decomposed, and generates potassium manganate, Manganse Dioxide and oxygen: 2KMnO
4→ K2MnO
4+ MnO
2+ O
2↑, if temperature is higher when heating, the potassium manganate of generation can continue to decompose.
Sodium hydroxide is a kind of alkaline matter with severe corrosive, very easily water-soluble, and the rising of solubility with temperature and increasing can be emitted a large amount of when dissolving; Sodium hydroxide has water-absorbent and strong basicity.
At present, for CrN coating, there are electrochemical stripping technology and electrolytic separation technology; Electrochemical stripping technology and electrolytic separation technology major defect are that cost is high, and speed of response is slow, and the coating of thoroughly removing die surface need to approximately 12 ~ 18 hours, and a professional lift-off technology equipment cost approximately needs nearly 8 ~ 100,000.
Summary of the invention
The object of this invention is to provide a kind of method of removing die surface chromium nitride coating, solve in prior art long, the high difficult problem of removing that causes of cost of mould coating removal time.
One embodiment of the present of invention are to provide a kind of method of removing die surface chromium nitride coating.The method comprises: mould is contacted with chemical solution, and constant temperature reacts until the chromium nitride coating of die surface completely takes off and removes at 70 ℃; Wherein, every 30 minutes cleaning mold surfaces to remove the chromium nitride coating of having removed;
The preparation method of this chemical solution is: water is warming up to 70 ℃, adds potassium permanganate and sodium hydroxide, stir; The weight ratio of sodium hydroxide, potassium permanganate and water is 1:5:200.
Preferably, the method also comprises: in the time that pressure is 3.0MPa, purge the mould of removal chromium nitride coating with sandblast machine employing 180# glass sand, remove the residual potassium permanganate of die surface.
The present invention is owing to having utilized the strong oxidizing property of potassium permanganate and the severe corrosive of sodium hydroxide thoroughly to remove die surface CrN coating; and the removal time is short; only need 4 ~ 6 hours; greatly improve efficiency; in addition; remove cost and also greatly reduced, only need 500 yuan of left and right, make large-scale production become possibility.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail, but they are not to further restriction of the present invention.
According to the application embodiment, a kind of method of removing die surface chromium nitride coating is provided, comprising: according to the suitable container of the size Selection of mould, be ready to well heater, constant temperature table; The mould that needs is taken off to painting is put into container, take mould vertex as benchmark; Add the tap water higher than 10 centimeters of vertexs, calculate the capacity of water in container; Set water temperature is 70 degree, starts the water heating in container; Water temperature reaches after 70 ℃, proportionally adds potassium permanganate and sodium hydroxide, stirs, and wherein, the additional proportion of water, sodium hydroxide and potassium permanganate is in 1 premium on currency, to add 25 grams of potassium permanganate and 5 grams of sodium hydroxide; Constant temperature 70 is spent, and removes the chromium nitride coating of die surface, removes with the speed of 1um/ hour; Be stripped from the chromium nitride coating getting off and can continue to cover die surface, every 30 minutes with hairbrush cleaning mold surface, removes and has been stripped from the chromium nitride coating getting off; Due to potassium permanganate water-soluble after, the aqueous solution is rose, after the complete removal of surfaces nitrided chromiumcoating, die surface can present sorrel, adopts sandblast machine 180# glass sand, the pressure of 3.0MPa purges die surface, the residual potassium permanganate of removal die surface.
Although in conjunction with specific embodiments the specific embodiment of the present invention is described in detail, it is not the restriction to this patent protection domain.In claims limited range, the various modifications that those skilled in the art can make without creative work or adjustment are still subject to the protection of this patent.
Claims (2)
1. a method of removing die surface chromium nitride coating, is characterized in that, comprising:
Mould is contacted with chemical solution, and constant temperature reacts until the chromium nitride coating of die surface completely takes off and removes at 70 ℃; Wherein, every 30 minutes cleaning mold surfaces to remove the chromium nitride coating of having removed;
The preparation method of this chemical solution is: water is warming up to 70 ℃, adds potassium permanganate and sodium hydroxide, stir; The weight ratio of sodium hydroxide, potassium permanganate and water is 1:5:200.
2. method according to claim 1, is characterized in that, also comprises:
Adopting 180# glass sand with sandblast machine is that 3.0MPa blowing down sweeps off the mould except chromium nitride coating at pressure, removes the residual potassium permanganate of die surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176240.7A CN103911624A (en) | 2014-04-29 | 2014-04-29 | Method for removing chromium nitride coating on surface of mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176240.7A CN103911624A (en) | 2014-04-29 | 2014-04-29 | Method for removing chromium nitride coating on surface of mould |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103911624A true CN103911624A (en) | 2014-07-09 |
Family
ID=51037619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410176240.7A Pending CN103911624A (en) | 2014-04-29 | 2014-04-29 | Method for removing chromium nitride coating on surface of mould |
Country Status (1)
| Country | Link |
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| CN (1) | CN103911624A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109594088A (en) * | 2018-12-29 | 2019-04-09 | 陕西宝成航空仪表有限责任公司 | The stripping liquid and preparation method and obstacles in quit of titanium nitride or TiAlN film layer |
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2014
- 2014-04-29 CN CN201410176240.7A patent/CN103911624A/en active Pending
Patent Citations (7)
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| JP4471066B2 (en) * | 2001-11-26 | 2010-06-02 | ゼネラル・エレクトリック・カンパニイ | Chemical removal of chromium oxide coating layer from parts |
| CN1781348A (en) * | 2003-12-05 | 2006-05-31 | 三井金属矿业株式会社 | Printed wiring board, its manufacturing method, and circuit device |
| US20050241679A1 (en) * | 2004-01-29 | 2005-11-03 | Rauch Udo M | Stripping apparatus and method for removal of coating on metal surfaces |
| CN101443128A (en) * | 2006-03-22 | 2009-05-27 | 瓦卢瓦有限合伙公司 | Fluid product dispensing pump |
| CN101413128A (en) * | 2007-10-19 | 2009-04-22 | 比亚迪股份有限公司 | Solution and method for removing chromium carbide film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109594088A (en) * | 2018-12-29 | 2019-04-09 | 陕西宝成航空仪表有限责任公司 | The stripping liquid and preparation method and obstacles in quit of titanium nitride or TiAlN film layer |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 610000, No. 998, herb Road, hi tech Zone (west end, Chengdu, Sichuan) Applicant after: CHENGDU BANGPU CUTTING TOOLS CO., LTD. Address before: 610000, No. 16, herb Road, Chengdu hi tech West District, Sichuan, Chengdu, 1 Applicant before: Chengdu?Bangpu Alloy Materials Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140709 |
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| RJ01 | Rejection of invention patent application after publication |