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Method for removing chromium nitride film on base material surface

A technology for chromium nitride film and substrate surface, which is applied in the field of removing chromium nitride film and can solve the problems of removing chromium nitride film and the like

Inactive Publication Date: 2011-01-26
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no method for effectively removing the chromium nitride film without damaging the surface of the substrate.

Method used

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  • Method for removing chromium nitride film on base material surface
  • Method for removing chromium nitride film on base material surface
  • Method for removing chromium nitride film on base material surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Chromium nitride film chemical stripping solution preparation: 20g sodium hydroxide and 63g potassium permanganate were dissolved in 1 liter of deionized water, stirred and mixed evenly to obtain a concentration of potassium permanganate of 0.4mol / L and a concentration of sodium hydroxide of 0.5mol / L alkaline mixed solution A.

[0022] Chromium nitride film chemical stripping method:

[0023] 1. Use vacuum ion plating technology (Shenzhen Zhenheng Industrial Co., Ltd., model ZHC-800) to coat a layer of chromium nitride film on the surface of stainless steel (40mm×80mm×1mm, Dongguan Rongjia Stainless Steel Raw Material Co., Ltd., 304 type), The thickness is 0.3 μm.

[0024] 2. Soak the stainless steel substrate coated with chromium nitride film in alkaline mixed solution A for 15 minutes, take out the substrate, clean it with water, and dry it with hot air.

[0025] According to the above operations, the 0.3μm chromium nitride film can be completely removed without cau...

Embodiment 2

[0027] Preparation of chemical stripping solution for chromium nitride film: Dissolve 20g of sodium hydroxide and 32g of potassium permanganate in 1 liter of deionized water, stir and mix evenly to obtain a concentration of potassium permanganate of 0.2mol / L and a concentration of sodium hydroxide 0.5mol / L alkaline mixed solution B; prepare a nitric acid solution with a concentration of 0.008mol / L.

[0028] Chromium nitride film chemical stripping method:

[0029] 1. Utilize the vacuum ion coating technology (same as embodiment 1) to coat one deck of chromium nitride film on the surface of stainless steel (same as embodiment 1), with a thickness of 0.8 μm.

[0030] 2. Soak the stainless steel substrate coated with chromium nitride film in alkaline mixed solution B for 30 minutes, take out the substrate, rinse it with water, and dry it with hot air.

[0031] 3. Transfer the above base material into the above hydrochloric acid solution and soak for 15 seconds. After removing th...

Embodiment 3

[0035] Preparation of chromium nitride film chemical stripping solution: Dissolve 8g of sodium hydroxide and 95g of potassium permanganate in 1 liter of deionized water, stir and mix evenly to obtain a concentration of potassium permanganate of 0.6mol / L and a concentration of sodium hydroxide 0.2mol / L alkaline mixed solution C; prepare a sulfuric acid solution with a concentration of 0.5mol / L.

[0036] Chromium nitride film chemical stripping method:

[0037] 1. Utilize the vacuum ion plating film technology (same as embodiment 1) to coat one deck of chromium nitride film on the surface of stainless steel (same as embodiment 1), with a thickness of 3 μm.

[0038] 2. Soak the stainless steel substrate coated with chromium nitride film in the alkaline mixed solution C for 10 minutes, take out the substrate, rinse it with water, and dry it with hot air.

[0039] 3. Transfer the above substrate into the above sulfuric acid and soak for 20 seconds, remove the light yellow precipit...

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Abstract

The invention provides a chemical stripping method for stripping a chromium nitride film. The stripping method comprises the following steps: causing a chemical solution to contact the chromium nitride film for a certain time, then cleaning a substrate with water and blowing dry; causing an acid solution to contact the chromium nitride film, cleaning the substrate with the water and blowing dry; and repeating the steps until the chromium nitride film is thoroughly stripped. The chemical stripping method for stripping the chromium nitride film can stably and effectively strip the chromium nitride film off the surface of the substrate without damaging the surface of an alkali-proof and acid-proof substrate.

Description

technical field [0001] The invention relates to a method for removing a chromium nitride film without damaging a base material. Background technique [0002] Hard film coating technology is an important means to strengthen the surface of materials and improve the performance of materials, so it has a wide range of applications in the industrial field. However, in some cases, such as after long-term use of the workpiece, the coating on the surface is seriously damaged and aged or in production, the coating does not meet the quality requirements, and the coating needs to be stripped, reworked and re-plated. Therefore, how to completely remove the coating from the surface of the substrate without damaging the substrate is a very important problem in the field of industrial production and application. [0003] There are usually three methods for deplating the coating on the surface of the substrate. One is the mechanical method. The mechanical method has a simple operation proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/02C23G5/00C23G1/14C23G1/00
Inventor 陈云薛文砚陈梁
Owner BYD CO LTD
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