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A kind of magnesium alloy surface modification process

A surface modification, magnesium alloy technology, applied in the field of magnesium alloys, can solve problems such as increasing the galvanic corrosion tendency of the film layer

Active Publication Date: 2022-04-05
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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  • A kind of magnesium alloy surface modification process
  • A kind of magnesium alloy surface modification process

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 technology suitable for magnesium alloys used in components such as engine casings of aerospace systems, specifically: degreasing, pickling, surface conditioning, plasma surface ceramization, and two Sub-organic spraying, the emissivity of the finally obtained plasma oxidation ceramic layer / organic coating composite treatment film reaches 0.88, the corrosion current density decreases by 6 orders of magnitude, the wear weight loss rate decreases by 1 order of magnitude and the friction coefficient is doubled. In the present invention, the substrate is primed by using plasma oxidation technology to form a ceramic layer with good bonding force, corrosion resistance and wear resistance, which plays a supporting role for the organic coating; and the porous structure on the surface of the ceramic layer increases the size of the entire workpiece. The specific surface area improves the binding force of the organic coating. The black coating formed by organic spraying further improves the corrosion resistance of the workpiece, reduces the coefficient of friction, and meets the requirements of high emissivity.

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 Patents(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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