Surface modification process for magnesium alloy

A surface modification, magnesium alloy technology, applied in the field of magnesium alloy surface strengthening, magnesium alloy surface modification technology, can solve the problem of increasing the galvanic corrosion tendency of the film layer, etc., to achieve the reduction of friction coefficient, increase of specific surface area, high The effect of emissivity

Active Publication Date: 2019-08-09
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing technology improves the hardness and compactness of the film layer by doping the electrolyte with sodium tungstate, rare earth elements, EDTA, EDTA-2Na, triethanolamine, etc., but the doping will increase the galvanic corrosion tendency of the film layer
The existing electrolyte and supporting voltage technology cannot solve this problem

Method used

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  • Surface modification process for magnesium alloy
  • Surface modification process for magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Step 1. Degreasing the surface of the VW93 magnesium alloy: the degreasing solution is: sodium hydroxide 50g / L, sodium phosphate 4g / L, sodium carbonate 6g / L, sodium lauryl sulfate 2mg / L. The degreasing temperature is 60°C and the time is 4min. After the treatment, the water droplets on the surface of the workpiece continue for 10S without interruption.

[0049] Step 2, pickling: pickling solution is: trisodium phosphate 8g / L, ammonium sulfate 3g / L, sodium nitrate 6g / L, tartaric acid 15g / L, oxalic acid 8g / L. The temperature is 45°C, and the time is 1 min. After the pickling is completed, there is no pitting on the surface of the workpiece.

[0050] Step 3, surface adjustment: surface adjustment solution is: sodium tripolyphosphate 10g / L, sodium hydroxide 20g / L, triethanolamine 5ml / L, triton 6ml / L. The temperature is 80°C, and the time is 5 minutes. After the surface adjustment is completed, the surface of the workpiece is shiny and free of residual loose oxides.

[...

Embodiment 2

[0054] Step 1, degreasing the surface of the VW93 magnesium alloy, the degreasing solution is: sodium hydroxide 50g / L, sodium phosphate 4g / L, sodium carbonate 6g / L, sodium lauryl sulfate 2mg / L. The degreasing temperature is 60°C and the time is 4min. After the treatment, the water droplets on the surface of the workpiece continue for 10S without interruption.

[0055] Step 2, pickling, the pickling solution is: trisodium phosphate 8g / L, ammonium sulfate 3g / L, sodium nitrate 6g / L, tartaric acid 15g / L, oxalic acid 8g / L. The temperature is 45°C, and the time is 1 min. After the pickling is completed, there is no pitting on the surface of the workpiece.

[0056] Step 3, surface adjustment, the surface adjustment solution is: sodium tripolyphosphate 10g / L, sodium hydroxide 20g / L, triethanolamine 5ml / L, triton 6ml / L. The temperature is 80°C, and the time is 5 minutes. After the surface adjustment is completed, the surface of the workpiece is shiny and free of residual loose oxid...

Embodiment 3

[0063] Step 1, degreasing the surface of the VW93 magnesium alloy, the degreasing solution is: sodium hydroxide 50g / L, sodium phosphate 4g / L, sodium carbonate 6g / L, sodium lauryl sulfate 2mg / L. The degreasing temperature is 60°C and the time is 4min. After the treatment, the water droplets on the surface of the workpiece continue for 10S without interruption.

[0064] Step 2, pickling, the pickling solution is: trisodium phosphate 8g / L, ammonium sulfate 3g / L, sodium nitrate 6g / L, tartaric acid 15g / L, oxalic acid 8g / L. The temperature is 45°C, and the time is 1 min. After the pickling is completed, there is no pitting on the surface of the workpiece.

[0065] Step 3, surface adjustment, the surface adjustment solution is: sodium tripolyphosphate 10g / L, sodium hydroxide 20g / L, triethanolamine 5ml / L, triton 6ml / L. The temperature is 80°C, and the time is 5 minutes. After the surface adjustment is completed, the surface of the workpiece is shiny and free of residual loose oxid...

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Abstract

The invention discloses a surface modification technique for magnesium alloy used for parts such as engine cases of aerospace systems. The surface modification technique specifically comprises the step of degreasing, pickling, surface conditioning, plasma surface ceramization and secondary organic spraying are sequentially conducted on the magnesium alloy; and the emissivity of a finally-obtainedplasma oxidized ceramic layer/organic coating composite treatment film reaches 0.88 and is reduced by six levels under the corrosion current density, the weight loss ratio caused by abrasion is reduced by one level, and the friction coefficient is reduced by one time. According to the surface modification technique for the magnesium alloy, the plasma oxidization technique is adopted for basic treatment of a matrix, so that the corrosion-resistant ceramic cylinder with good binding force is formed to support an organic coating; and the surface of the ceramic layer is of a porous structure, so that the specific surface area of a whole workpiece is enlarged, and the binding force of the organic coating is improved. Through the black coating formed through organic spraying, the corrosion resistance of the workpiece is further improved, the friction coefficient is decreased, and the using requirement for high emissivity is met.

Description

technical field [0001] The invention aims at the magnesium alloy used in parts such as the engine box of the aerospace system, relates to a magnesium alloy surface modification process, achieves the integration of high emissivity and high corrosion resistance functions, and belongs to the field of magnesium alloy surface strengthening. Background technique [0002] Lightweight is one of the important development directions of aerospace component materials. Magnesium alloy is currently the lightest metal structure material in practical application, and the density of pure magnesium is 1.74g / cm 3 , about 2 / 3 of aluminum alloy, 2 / 5 of titanium alloy, and 1 / 4 of steel, which is equivalent to most engineering plastics. Magnesium alloy overcomes the application bottleneck of low high-temperature strength of common magnesium alloy. The tensile strength of forgings at room temperature is ≥400MPa, and the tensile strength at 200°C is ≥320MPa. However, the corrosion resistance of ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D7/24B05D1/06C25D11/30
CPCB05D7/14B05D7/24B05D1/06C25D11/30C25D11/024B05D2202/20B05D2504/00
Inventor 刘永青熊雯瑛张振宇肖宏超刘海平
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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