Treatment method for modifying metal passivation film through dielectric barrier discharge

A technology of dielectric barrier discharge and metal passivation, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of waste of resources and energy, unenvironmental treatment liquid, poor adhesion of substrate, etc. The effect of increased rate, improved chemical stability of film, improved corrosion resistance and high temperature oxidation resistance

Inactive Publication Date: 2020-07-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solution is to prepare various protective layers on the metal surface, but these methods have disadvantages such as poor bonding with the substrate, unenvironmental treatment liquid, high cost, etc.
At the same time, for different types of metals, different treatment processes are often required, resulting in a great waste of resources and energy

Method used

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  • Treatment method for modifying metal passivation film through dielectric barrier discharge
  • Treatment method for modifying metal passivation film through dielectric barrier discharge
  • Treatment method for modifying metal passivation film through dielectric barrier discharge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Grind the zirconium metal to be treated to 2000# sandpaper, ultrasonically wash it in absolute ethanol and acetone for 1 min, and the ultrasonic power is 50W, and then dry it in a drying oven (temperature 30°C) for 1 h. After processing, it is stored in a vacuum tank (vacuum degree 1Pa). Before the treatment starts, preheat the double dielectric barrier discharge apparatus (that is, a kind of low-temperature plasma equipment), and set the device parameters, the discharge gap is 6mm, and the discharge voltage is 30V. Subsequently, the sample to be processed was placed between the dielectric plates, the frequency was adjusted to a stable current output, and the processing atmosphere was air (1 atm). After 0.5h of dielectric barrier discharge treatment, the power can be turned off and the treated samples can be taken out.

Embodiment 2

[0032] Grind the metal aluminum to be treated to 2000# sandpaper, ultrasonically wash in absolute ethanol and acetone for 1 min respectively, and the ultrasonic power is 50W, and then dry in a drying oven (temperature 40°C) for 1 h. After processing, it is stored in a vacuum tank (vacuum degree 10Pa). Before the treatment starts, preheat the double dielectric barrier discharge apparatus (that is, a kind of low-temperature plasma equipment), and set the device parameters, the discharge gap is 10mm, and the discharge voltage is 80V. Subsequently, the sample to be processed was placed between the dielectric plates, the frequency was adjusted to a stable current output, and the processing atmosphere was air (1 atm). After 5 hours of dielectric barrier discharge treatment, the power can be turned off and the treated samples can be taken out.

Embodiment 3

[0034] The metal 316L stainless steel to be treated was ground to 2000# sandpaper, ultrasonically washed in absolute ethanol and acetone for 5 min, and the ultrasonic power was 30W, and then dried in a drying oven (temperature 35°C) for 1 h. After processing, store it in a vacuum tank (vacuum degree below 5Pa). Before the treatment starts, preheat the double dielectric barrier discharge apparatus (that is, a kind of low-temperature plasma equipment), and set the device parameters, the discharge gap is 8mm, and the discharge voltage is 50V. Subsequently, the sample to be processed was placed between the dielectric plates, the frequency was adjusted to a stable current output, and the processing atmosphere was air (1 atm). After 3 hours of dielectric barrier discharge treatment, the power can be turned off and the treated samples can be taken out.

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Abstract

The invention discloses a treatment method for modifying a metal passivation film through dielectric barrier discharge. The method comprises the following steps of firstly, polishing metal to be treated, and carrying out ultrasonic vibration washing in absolute ethyl alcohol and acetone separately to obtain a vibration washing sample; secondly, drying the vibration washing sample, and storing thevibration washing sample in a vacuum environment for later use; and finally, preheating a double-dielectric barrier discharge instrument, setting device parameters, then placing a standby sample to betreated between dielectric plates, carrying out frequency modulation until stable current output is achieved, after dielectric barrier discharge treatment is completed, turning off a power supply, taking out the treated sample, and obtaining a thickened passivation film on the surface of the treated sample. The method is low in cost, easy to operate, efficient and suitable for various metals andalloys, the corrosion resistance and high-temperature oxidation resistance of the modified passivation film are greatly improved, a new thought and means can be provided for metal surface protection,and application and development of metal materials and ultrathin metal oxide film layers can be greatly promoted.

Description

technical field [0001] The invention belongs to the field of material corrosion and protection, and in particular relates to a treatment method for modifying a metal passivation film through dielectric barrier discharge. Background technique [0002] In nature, there is a layer of metal oxide film on the surface of all metals and alloys except gold, that is, passivation film. This thin film directly determines the physical and chemical properties of metal and alloy surfaces. For structural metal materials, this film determines the corrosion resistance and high temperature oxidation resistance of the metal, and is the key to the material's resistance to environmental and high temperature erosion and maintaining its mechanical properties. By adjusting the chemical composition of the metal matrix, the passivation film composition can be directly changed, but it is difficult to meet the mechanical performance requirements of bulk metal materials. The thickness of the passivati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38C23C8/36C23C8/14C23C8/12C23C8/02
CPCC23C8/02C23C8/12C23C8/14C23C8/36C23C8/38
Inventor 周根树任颖李禹辰康珍玮张潇珂单智伟
Owner XI AN JIAOTONG UNIV
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