Multiple alloy co-carburized and enclosed coating and application therefor

A technology of multi-component alloy co-infiltration and sealing coating, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problems of strict process conditions, high cost, process control and operation difficulty, etc. achieve huge economic benefits

Active Publication Date: 2009-06-24
SHANGHAI DACROMET SURFACE TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has obvious weaknesses. 1) The combination process conditions of the first and second layers are very strict, which brings certain difficulties to process control and operation; 2) Its interference resistance to neutral salt spray mainly depends on Zinc-chromium coatings are closed, and the formation of zinc-chromium coatings accounts for a higher cost in SDD-1 coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 (multivariate gold-containing co-infiltration adds sealing coating and making)

[0038] The coating described in the summary of the invention is composed of two layers, the first layer is a multi-component alloy co-infiltration layer and a passivation layer, and the multi-component alloy co-infiltration layer is composed of 90% by mass of zinc and not less than 450ppm of lanthanum oxide, the balance is composed of aluminum, and the thickness of the permeated layer is about 50μm, where δ 1 The phase is controlled at 5-8μm; the process temperature is 440 ° C for 2 hours, after cooling out of the furnace, and then the passivation solution is applied to the workpiece by brush and dried to form a Cr-free layer on it. 6+ passivation layer, the thickness of the passivation layer is 2-3μm, and then a sealing layer consisting of 10% by mass percentage of aluminum, zinc flakes and 90% by mass percentage of epoxy resin is applied on the passivation layer, at 160°C , ...

Embodiment 2

[0039] Embodiment 2 (the application example of multi-element alloy co-infiltration plus sealing coating)

[0040] High-speed railways and many other key projects put forward new high requirements for heavy-duty anti-corrosion materials, and hope to achieve the standard of less maintenance or even maintenance-free. The components on the rails are exposed to the natural environment, exposed to the sun and rain, and also bear the effects of friction, wear and reciprocal stress. Traditional electroplating, single zinc-chromium coating and other processes are difficult to meet the service life of steel parts. Therefore, we adopted the SDD-2 type coating, and conducted four years of field and tunnel follow-up assessments on the Yuhuai line. The results proved that the SDD-2 coating has good wear resistance and corrosion resistance, and has been awarded by China Railway Science and Technology Co., Ltd. Recognized by the Institute, and approved for use on passenger dedicated lines w...

Embodiment 3

[0043] The Zhengxi Line of China Railway First Bureau also adopted multi-component alloy co-infiltration + sealing treatment in the technical processing of the pre-embedded steel plates, sleeves and other components on the top of the bridge support.

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Abstract

The invention relates to a multi-element alloy co-infiltrated and sealed coating, which is characterized in that the anti-corrosion coating is a multifunctional coating combined with an infiltrated coating and a coating. The first layer is multi-alloy co-infiltration layer and passivation layer. Co-infiltration alloys include alloys such as zinc, aluminum and rare earth lanthanum oxide, and the passivation layer is a film layer that does not contain Cr6+. The second layer of aluminum-zinc sheet and epoxy resin is used as the sealing layer. The first layer of permeation layer and passivation layer is 35-50 μm, and the second layer of coating is 10-12 μm. After combining, the neutral salt spray resistance time can reach more than 500h, the coating hardness reaches 9H, and the relative wear amount is less than 50%. The cost performance of the coating provided is much better than that of the previous SDD-1 coating, and it has been successfully applied to the commonly used span beams of the non-chamber track of the passenger dedicated line with a speed of 350 km / h and the embedded steel plate and sleeve on the top of the railway bridge support.

Description

technical field [0001] The invention relates to a multi-element alloy co-infiltrated and sealed coating (hereinafter referred to as SDD-2 coating) and its application. The coating provided by the invention not only maintains the original advantages of pollution-free, hydrogen-free embrittlement, and excellent neutral salt spray resistance, but also overcomes the shortcomings of the original single coating, and also improves the wear resistance of the original film layer , solves the possibility of being used under different acid and alkali conditions, and greatly improves the overall performance of the original coating. It belongs to the field of metal anticorrosion. Background technique [0002] On the basis of the production and application concept of the original multi-functional anti-corrosion composite coating, the applicant once developed a multi-functional anti-corrosion coating (hereinafter referred to as SDD-1 coating). The SDD-1 coating is formed by combining thr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C10/00C23C12/00C23C22/00B05D7/24C09D5/10E01B3/16E01D19/04
Inventor 黄华清汪庆年
Owner SHANGHAI DACROMET SURFACE TREATMENT
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