Method for removing diamond-like carbon film on steel surface

A steel surface and diamond technology, which is applied in the field of removing the coating on the surface of the workpiece, can solve the problems of low precision of the mechanical grinding removal method, unfavorable large-scale promotion and use, and easy damage to the workpiece substrate, etc., to achieve good conductivity and good corrosion inhibition The effect of slowing down the dissolution rate

Inactive Publication Date: 2010-01-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The mechanical grinding method has low accuracy, easily damages the workpiece substrate, and is not suitable for parts with complex shapes; the plasma bombardment removal method has high accuracy, but it takes a long time and high cost, which is not conducive to large-scale promotion and use

Method used

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  • Method for removing diamond-like carbon film on steel surface
  • Method for removing diamond-like carbon film on steel surface

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The workpiece to be processed is a high-speed steel twist drill, the surface is a multi-layer film structure, and the order from bottom to top is chromium / chromium carbide / a-C:H (including similar Ti / TiC / a-C:H, W / WC / a-C: H), the structure of the film on the surface of the workpiece is shown in figure 1 shown. Removing the multilayer film on its surface includes the following steps:

[0021] ① Place the workpiece in a vacuum chamber, use a linear ion beam source to provide an oxygen plasma beam, and accelerate the ion beam to attack the workpiece under a certain bias voltage, causing the diamond-like film on the surface of the workpiece to be modified and partially peeled off.

[0022] ②The volume concentration of phosphoric acid is 5%-10%, the volume concentration of sulfuric acid is 1%-5%, and the volume concentration of glycerol is 0.1%-2%. Preferably, the volume concentration of phosphoric acid is 8%, and the volume concentration of sulfuric acid is Concentration o...

Embodiment 2

[0026] The workpiece to be processed is a carbon steel sewing machine needle bar part, the surface is a multi-layer film structure, and it is Cr / CrC / a-C:H from bottom to top (including similar Ti / TiC / a-C:H, W / WC / a-C:H). Removing the multilayer film on its surface includes the following steps:

[0027] ① Place the workpiece in a vacuum chamber, use a linear ion beam source to provide an oxygen plasma beam, and accelerate the ion beam to attack the workpiece under a certain bias voltage, causing the diamond-like film on the surface of the workpiece to be modified and partially peeled off.

[0028] ②The volume concentration of phosphoric acid is 7%-12%, the volume concentration of sulfuric acid is 0.5%-3%, and the volume concentration of glycerol is 0.1%-3%. Preferably, the volume concentration of phosphoric acid is 9%, and the volume concentration of sulfuric acid is 9%. Concentration of 2%, glycerol volume concentration of 1% composite acidic electrolyte, with the workpiece a...

Embodiment 3

[0032] The workpiece to be treated is a stainless steel mobile phone shell, the surface of which is coated with a-C:H single-layer film. Removing its surface diamond-like carbon film comprises the following steps:

[0033] ① Place the workpiece in a vacuum chamber, use a linear ion beam source to provide an oxygen plasma beam, and accelerate the ion beam to attack the workpiece under a certain bias voltage, causing the diamond-like film on the surface of the workpiece to be modified and partially peeled off.

[0034] ② Use a composite acidic electrolyte with a phosphoric acid volume concentration of 15-30%, a sulfuric acid volume concentration of 0.1%-2%, and a glycerol volume concentration of 1%-5%. The preferred phosphoric acid volume concentration is 20%, and the sulfuric acid volume concentration is 1%, composite acidic electrolyte with glycerol volume concentration of 3%, with the workpiece as the anode, at room temperature, at 10-20A / dm 2 Electrolyze for 5-10min at a cu...

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Abstract

The invention provides a method for removing a diamond-like carbon film on a steel surface. The method comprises the step of adopting an iron and steel workpiece as an anode to electrolyze in acid electrolyte formed by mixing phosphoric acid, sulfuric acid, glycerine and deionized water till the diamond-like carbon film is completely removed. The method can rapidly remove the diamond-like carbon film on the steel surface, does not generate destructive corrosion on the surface of a matrix and less changes the size and the shape of the workpiece; and the the workpiece can be re-plated with film and used after the film is removed.

Description

technical field [0001] The invention relates to a method for removing a coating film on the surface of a workpiece, in particular to a method for removing a diamond-like carbon film on a steel surface. Background technique [0002] Diamond-like carbon film (DLC) is a general term for a class of amorphous carbon film materials, and the four electrons of its carbon atoms have sp 2 and sp 3 Two bonding methods, the structure is between crystalline diamond and graphite, and can be subdivided into hydrogenated diamond-like carbon film (a-C:H) and hydrogen-free tetrahedral amorphous carbon film (ta -C). DLC carbon film has many excellent properties similar to diamond, including extremely high hardness, resistivity, electrical insulation strength, excellent wear resistance, extremely low friction coefficient, and high transmittance in the visible and near-infrared regions. rate, and at the same time, it exhibits extremely high chemical inertness in corrosive media. Therefore, D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F1/06C25F5/00
Inventor 汪爱英张栋孙丽丽
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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