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Fused salt oxygen, carbon and sulfur co-cementation type corrosion-resistant ceramic coating of magnesium alloy surface as well asand preparation and application

A technology of oxycarbon-sulfur co-infiltration and ceramic coating, applied in metal material coating process, coating, solid-state diffusion coating, etc. It is easy to control the product quality, and it is convenient for mass production.

Inactive Publication Date: 2013-12-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a molten salt oxygen carbon sulfur co-infiltration corrosion-resistant ceramic coating on the surface of magnesium alloy and its preparation and application, which is a composite surface treatment process that can improve the surface hardness, wear resistance and corrosion resistance of magnesium alloy Technology to solve the problem of corrosion resistance of workpieces made of magnesium alloys, and overcome the disadvantage that the special-shaped complex parts of magnesium alloys with deep hole inner walls cannot be protected by the corrosion-resistant layer in micro-arc oxidation

Method used

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  • Fused salt oxygen, carbon and sulfur co-cementation type corrosion-resistant ceramic coating of magnesium alloy surface as well asand preparation and application
  • Fused salt oxygen, carbon and sulfur co-cementation type corrosion-resistant ceramic coating of magnesium alloy surface as well asand preparation and application
  • Fused salt oxygen, carbon and sulfur co-cementation type corrosion-resistant ceramic coating of magnesium alloy surface as well asand preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The rare earth magnesium alloy (Mg-10Gd-4Y-0.4Zr) sample is subjected to surface mechanical polishing pretreatment, and immersed in an organic trichlorethylene solvent for scrubbing to remove oil on the surface of the magnesium alloy, and ultrasonically cleaned in an organic trichlorethylene solvent After 5 minutes, dry it in an oven at 80 degrees Celsius, and put it into a liquid oxycarbon-sulfur infiltration furnace chamber with a temperature of 295 degrees Celsius (the molten salt composition used in the oxycarbon-sulfur infiltration furnace is 30mol.% Li + , 30mol.% Na + , 50mol.% K + , 8wt.% CNO - , 0.2wt.% S 2- and 25wt.% CO 3 2- , 10wt% NO 2 - , 15wt% KNO 3 and the balance of OH - ), keep warm for 90 minutes, cool in 80 ℃ hot water, clean the workpiece and dry it. Mechanically polish the surface of the workpiece to remove the loose oxide layer on the surface, then place it in an organic trichlorethylene solvent for ultrasonic cleaning for 5 minutes, dry ...

Embodiment 2

[0042] The difference from Example 1 is:

[0043] The AM60 die-casting magnesium alloy is subjected to surface mechanical polishing pretreatment, and immersed in an acetone organic solvent for scrubbing to remove oil stains on the surface of the magnesium alloy. After ultrasonic cleaning in an acetone organic solvent for 8 minutes, it is dried in an oven at 90 degrees Celsius and placed Into the liquid oxycarbon-sulfur infiltration furnace cavity with a temperature of 280 degrees Celsius (the molten salt composition used in the oxycarbon-sulfur infiltration furnace is 35mol.% Li + , 30mol.% Na + , 35mol.% K + , 5wt.% CNO - , 0.1wt.% S 2- and 30wt.% CO 3 2- , 10wt% NO 2 - , 20wt% KNO 3 and the balance of OH - ), keep warm for 60 minutes, cool in hot water at 80 degrees Celsius, clean the workpiece and dry it. Mechanically polish the surface of the workpiece to remove the loose oxide layer on the surface, then place it in an acetone organic solvent for ultrasonic clean...

Embodiment 3

[0047] The difference from Example 1 is:

[0048] The rare earth magnesium alloy (Mg-12Gd-5Y) is subjected to surface mechanical polishing pretreatment, and immersed in trichlorethylene organic solvent for scrubbing to remove oil on the surface of the magnesium alloy. After ultrasonic cleaning in trichlorethylene organic solvent for 10 minutes, Dry it in an oven at 100 degrees Celsius, and put it into a liquid oxycarbon-sulfur infiltration furnace chamber with a temperature of 260 degrees Celsius (the molten salt composition used in the oxycarbon-sulfur infiltration furnace is 25mol.% Li + , 25mol.% Na + , 55mol.% K + , 8wt.% CNO - , 0.2wt.% S 2- and 25wt.% CO 3 2- , 15wt% NO 2 - , 20wt% KNO 3 and the balance of OH - ), keep warm for 20 minutes, cool in hot water at 80 degrees Celsius, clean the workpiece and dry it. Mechanically polish the surface of the workpiece to remove the loose oxide layer on the surface, then place it in an organic trichlorethylene solvent fo...

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Abstract

The invention relates to a processing technology of a magnesium alloy surface, and in particular relates to a fused salt oxygen, carbon and sulfur co-cementation type corrosion-resistant ceramic coating of the magnesium alloy surface and preparation and application thereof, aiming at solving the problem due to the corrosion resistance of a part manufactured from a magnesium alloy and overcoming the shortcoming that the inner hole of a deep hole in an irregular complex magnesium alloy part cannot be protected with a corrosion-resistant layer. The preparation comprises the following steps of: taking the magnesium alloy as a substrate material; and immersing a magnesium alloy part into a liquid oxygen, carbon and sulfur co-cementation solution to perform liquid oxygen, carbon and sulfur co-cementation treatment on the magnesium alloy surface, thus obtaining an oxidized ceramic coating with high corrosion resistance; the ceramic coating is uniform and dense in thickness, ranging from 10 to 60 microns. By adopting the fused salt oxygen, carbon and sulfur co-cementation type corrosion-resistant ceramic coating, the hardness as well as abrasion resistance of the magnetism alloy surface can be improved; the corrosion resistance of the magnesium alloy can be obviously improved; the fused salt oxygen, carbon and sulfur co-cementation type corrosion-resistant ceramic coating can be applied to functional treatment of the surfaces of a hub, a radiating fin and other parts manufactured from the magnesium alloy; in addition, the liquid oxygen, carbon and sulfur co-cementation solution isare simple in components, the raw materials are easy to getcarry out, and the industrial production can be performed.

Description

technical field [0001] The invention relates to material surface treatment technology, in particular to a molten salt oxygen-carbon-sulfur co-infiltration corrosion-resistant ceramic coating on the surface of a magnesium alloy and its preparation and application, and uses liquid oxygen-carbon-sulfur co-infiltration technology to prepare corrosion-resistant ceramics on the surface of a magnesium alloy coating. Background technique [0002] Magnesium alloy is the most widely used light alloy material in the aviation industry. If magnesium alloy castings are used instead of aluminum alloy castings, the weight of the workpiece can be reduced by about one-third under the same design strength requirements. Therefore, magnesium alloy has become an extremely important structural material. It is mainly used in structural parts that require high specific strength and good shock resistance, such as missile guidance systems, landing hubs, engine casings and other components. Coupled wi...

Claims

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Application Information

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IPC IPC(8): C23C8/52
Inventor 牛云松于志明杜丹丹
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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