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A method for completely removing diamond-like carbon film on workpiece surface

A workpiece surface and diamond technology is applied in the field of completely removing the coating film on the workpiece surface, which can solve the problems of destructive ablation of the workpiece substrate, difficulty in obtaining a diamond carbon film, and incomplete stripping of the diamond-like carbon film, etc., so as to reduce damage. , reduce corrosion, avoid the effect of overload

Active Publication Date: 2016-03-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, when using this method to remove the diamond-like carbon film on the surface of the workpiece, the deplating of the diamond-like carbon film is often incomplete, or the substrate of the workpiece is destructively ablated, so it is difficult to obtain a diamond-like carbon film. Complete stripping, while the workpiece substrate remains undamaged deplating results

Method used

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  • A method for completely removing diamond-like carbon film on workpiece surface

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Embodiment 1

[0045] In this embodiment, the workpiece substrate is made of iron and steel, and the surface of the workpiece substrate is a diamond-like carbon film. Deplating the diamond-like carbon film comprises the following steps:

[0046] (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 bombard the workpiece under a certain bias, causing the diamond-like film on the surface of the workpiece to be modified and loose in structure. The time is 180min;

[0047] (2) Use the workpiece as an anode at room temperature, and perform electrolysis in a sulfuric acid electrolyte with a volume concentration of 1%. From 0V, the voltage is controlled to increase slowly and gradually at a step rate of 2V each time, and stay for 2min after each voltage increase. Observe whether the carbon film on the surface of the workpiece fades away. When the voltage rises to 8V and observe for 1 minute, the diamond-like carbo...

Embodiment 2

[0050] This example is a comparative example of Example 1.

[0051] In this embodiment, the workpiece is exactly the same as in Embodiment 1. Deplating the diamond-like carbon film on the surface of the workpiece substrate comprises the following steps:

[0052] (1) Same as step (1) of Example 1;

[0053] (2) Use the workpiece as an anode at room temperature, and perform electrolysis in a sulfuric acid electrolyte with a volume concentration of 1%. From 0V, the voltage is controlled to increase slowly and gradually at a step rate of 2V each time, and stay for 2min after each voltage increase. Observe whether the carbon film on the surface of the workpiece has faded. When the voltage is increased to 8V and observed for 1 minute, the diamond-like carbon film on the surface of the workpiece has faded. Slowly lower the voltage to 0V. It takes 1 minute. During the step-down process, the surface of the workpiece is ablated and emits Pungent smell.

Embodiment 3

[0055] This example is another comparative example of Example 1. Include the following steps:

[0056] In this embodiment, the workpiece is exactly the same as in Embodiment 1. Deplating the diamond-like carbon film on the surface of the workpiece substrate comprises the following steps:

[0057] (1) Same as step (1) of Example 1;

[0058] (2) Use the workpiece as an anode at room temperature, and perform electrolysis in a sulfuric acid electrolyte with a volume concentration of 1%. From 0V, the voltage is controlled to increase slowly and gradually at a step rate of 2V each time, and stay for 2min after each voltage increase. Observe whether the carbon film on the surface of the workpiece fades away. When the voltage rises to 22V, the surface of the workpiece is ablated and emits a pungent smell.

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Abstract

The invention provides a method for completely removing a diamond-like carbon film from the surface of a workpiece. The method comprises the steps of firstly bombarding the surface of the workpiece by oxygen plasmas, then, carrying out electrolytic deplating in an acidic electrolyte at room temperature in a manner of taking the workpiece as an anode, slowly increasing the electrolysis voltage at the rate of 0.5-2 volt per time once by once, maintaining for 0-15 minutes whenever the voltage is increased, then, observing whether the diamond-like carbon film on the surface of the workpiece is completely removed or not, continuously increasing the voltage until the voltage is increased to 10-20V if the diamond-like carbon film on the surface of the workpiece is not completely removed, rapidly decreasing the voltage to 0V in 0-5 seconds if the diamond-like carbon film on the surface of the workpiece is completely removed or the voltage is increased to 10-20V, then, taking out the workpiece, cleaning, then, observing, and repeating the processes of oxygen plasma bombarding and electrolytic deplating if the diamond-like carbon film on the surface of the workpiece is not completely removed yet. Confirmed by experiments, by using the method, the diamond-like carbon film on the surface of the workpiece can be completely removed, and corrosion and destruction to the workpiece are not caused, so that the method has a good application prospect.

Description

technical field [0001] The invention relates to a method for completely removing the coating film on the surface of a workpiece, in particular to a method for completely removing the diamond-like carbon film on the 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 co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/02
Inventor 张栋汪爱英孙丽丽柯培玲
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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