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Normal atmosphere plasma strip steel film coating process

A technology of atmospheric pressure plasma and strip steel, applied in the direction of plasma, metal material coating process, gaseous chemical plating, etc., can solve the problems of complex equipment, expensive production and maintenance costs, high one-time investment costs, etc., and achieve low operating costs Effect

Inactive Publication Date: 2009-03-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these processes all need to be carried out in a certain vacuum coating
In order to achieve the required vacuum degree, especially for the air-to-air method used in large-scale production of steel coils, a multi-stage sealing device of 7-8 levels is required, the equipment is complex, the one-time investment cost is high, and the production and maintenance costs are expensive.

Method used

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  • Normal atmosphere plasma strip steel film coating process
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Examples

Experimental program
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Effect test

Embodiment 1

[0042] Using Nitrogen as Carrier Gas and HMDSO as Precursor to Generate Townsend Discharge to Plating Steel Strip with SiO 2 .

[0043] In this embodiment, nitrogen is selected as the carrier gas, DBD produces Townsend discharge, and SiO is plated on cold-rolled steel coils. 2 film.

[0044] In the DBD section, under normal pressure, 20sccm nitrogen gas is introduced, and the content of HMDSO is at 20ppm, ensuring that [N 2 O] / [HMDSO] ratio around 24 to achieve SiO 2 film.

[0045] The frequency of the voltage is 6kHz, and the discharge density is 0.1~2W / cm 2 between.

[0046] The cold-rolled sheet passes through at 20m / min, which can achieve 50-100nm SiO 2 coating products.

[0047] When the width of the cold-rolled sheet is in the range of 300mm, the fluctuation of the film thickness is within 3%. Its film structure is as figure 1 As shown, it can be seen that what is deposited is SiO 2 film.

Embodiment 2

[0049] Nitrogen as carrier gas, SiH 4 Thomson discharge used as precursor to realize SiO plating on steel strip 2 .

[0050] In this embodiment, nitrogen is selected as the carrier gas, DBD produces Townsend discharge, and SiO is plated on cold-rolled steel coils. 2 film.

[0051] In the DBD section, under normal pressure, nitrogen gas is passed at a rate of 5 sccm, SiH 4 The content is kept at 5ppm, O 2 The content is kept at 15ppm.

[0052] The frequency of the voltage is selected within the range of 1 ~ 10kHz, and the discharge density is 3.4W / cm 2 between. The range from the steel plate is adjustable within 1-2mm.

[0053] The cold-rolled sheet passes through at 10m / min, which can achieve 50-100nm SiO 2 coating products.

[0054] When the width of the cold-rolled sheet is in the range of 300mm, the thickness fluctuation of the film is within 5%. XPS analysis results show that the surface is SiO 2 structure, the refractive index is in the range of 1.15 to 1.4. A...

Embodiment 3

[0056] Using nitrogen as carrier gas, TiO[CH 3 COCH=C(O-)CH 3 ] 2 Thomson discharge as a precursor for stainless steel coil plating with TiO 2 .

[0057] In this example, nitrogen is selected as the carrier gas, and TiO[CH 3 COCH=C(O-)CH 3 ] 2 As a precursor to generate Townsend discharge, TiO plating on stainless steel coils 2 film.

[0058] In the DBD section, under normal pressure, nitrogen gas is introduced at a rate of 5 sccm, the content of oxygen is 20%, and TiO[CH 3 COCH=C(O-)CH 3 ] 2 The flow rate is kept between 0.02 and 1mol / l.

[0059] The frequency of the voltage is selected as 100kHz, and the distance from the steel plate is 1mm.

[0060] If the stainless steel plate is preheated to 200-300 degrees and passes through it at 10 m / min, 20-50nm TiO can be achieved. 2 coating products. The content of oxygen element in the coating is directly proportional to the content of oxygen in the incoming gas. As the preheating temperature increases, the content of...

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Abstract

The invention discloses a normal pressure plasma strip steel film coating process; a base plate coil is decoiled and enters into a normal pressure plasma film coating unit; two electrodes are adopted, wherein, a high-voltage electrode is arranged above a steel sheet and covered by a barrier layer; a running base plate is arranged below the high-voltage electrode, grounded or arranged above a grounding electrode, and separated by an insulating substance; AC or DC with the frequency between 200Hz to 20KHz is fed between the two electrodes by feeding an organic precursor and carrier gas thereof with the flow more than 0.01sccm as well as reactant gas with the flow more than 1sccm; a dielectric layer or an insulating layer obstructs the current and produces dielectric discharge; medium obstructs the discharge and generates plasma; the steel sheet is coated with film when passing the plasma area. The whole process is environment protective, can realize a plurality of film coated products, and has simpler process and low investment compared with strip steel vacuum film coating.

Description

technical field [0001] The invention relates to strip steel surface treatment technology, in particular to an atmospheric pressure plasma strip steel coating process. Background technique [0002] Steel sheets with good surface properties are key materials in the automotive, construction and appliance industries. [0003] Existing strip steel coating technologies mainly include hot-dip galvanizing, electro-galvanizing, electro-tinning, color coating and other coating processes. It usually also includes chemical pretreatment and phosphating, passivation, anti-fingerprint coating and other pre- and post-treatment processes. [0004] In recent years, the market's demand for steel plates with better surface properties has been increasing. At the same time, users have higher and higher performance requirements for coated products. Users hope that coated products can not only meet corrosion resistance, environmental compatibility, excellent processability and surface optical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/50C23C16/52H05H1/24
Inventor 杨立红傅建钦张健杨晓萍
Owner BAOSHAN IRON & STEEL CO LTD
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