Ion liquid assisted magnesium lithium alloy anodic oxidation film forming method

A technology of anodic oxidation and magnesium-lithium alloy, applied in the direction of anodic oxidation, etc., to achieve good corrosion resistance, improved growth behavior, and simple preparation process

Active Publication Date: 2019-08-16
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by adding ionic liquids to the magnesium-lithium alloy electrolyte to improve the corrosion resistance and wear resistance of the anodized film layer, there is no such report.

Method used

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  • Ion liquid assisted magnesium lithium alloy anodic oxidation film forming method
  • Ion liquid assisted magnesium lithium alloy anodic oxidation film forming method
  • Ion liquid assisted magnesium lithium alloy anodic oxidation film forming method

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Experimental program
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Effect test

Embodiment 1

[0032] An ionic liquid-assisted magnesium-lithium alloy anodic oxidation film-forming method may comprise: the sodium hydroxide of 50g / L, the sodium silicate of 40g / L, the sodium tetraborate of 30g / L, the dihydrate citric acid of 40g / L Sodium is mixed together to make a sodium silicate electrolyte system; then add 1-butyl-3 methylimidazolium tetrafluoroborate to make silicon The volume concentration of 1-butyl-3 methylimidazolium tetrafluoroborate in the sodium chloride electrolyte system is 4%, and the mixture is evenly mixed to obtain the magnesium-lithium alloy anode oxidation electrolyte. The magnesium-lithium alloy workpiece is used as the anode, and the stainless steel or lead plate is used as the cathode, and the constant current mode is used for anodic oxidation, and the current density of the constant current mode is 1A / dm 2 , the distance between the anode and the cathode is controlled at 10cm, the anodic oxidation time is 30min, and the temperature is 15°C. After th...

Embodiment 2

[0035] An ionic liquid-assisted magnesium-lithium alloy anodic oxidation film-forming method may comprise: the sodium hydroxide of 50g / L, the sodium silicate of 40g / L, the sodium tetraborate of 30g / L, the dihydrate citric acid of 40g / L Sodium is mixed together to make a sodium silicate electrolyte system; then add 1-butyl-3 methylimidazolium tetrafluoroborate to make silicon The volume concentration of 1-butyl-3 methylimidazolium tetrafluoroborate in the sodium chloride electrolyte system is 2%, and the mixture is evenly mixed to obtain the magnesium-lithium alloy anode oxidation electrolyte. The magnesium-lithium alloy workpiece is used as the anode, and the stainless steel or lead plate is used as the cathode, and the constant voltage mode is used for anodizing. The voltage of the constant voltage mode is 125V, the distance between the anode and the cathode is controlled at 10cm, the anodizing time is 30min, and the temperature is 15℃ , after the anodic oxidation is finished...

Embodiment 3

[0038] An ionic liquid-assisted magnesium-lithium alloy anodic oxidation film-forming method may comprise: the sodium hydroxide of 50g / L, the sodium silicate of 40g / L, the sodium tetraborate of 30g / L, the dihydrate citric acid of 40g / L The sodium is mixed together to obtain a sodium silicate electrolyte system; the sodium silicate electrolyte system is divided into three parts, and then 1-butyl-3 methylimidazolium tetrafluoroborate is added to make the addition of 1-butyl- The volume concentration of 1-butyl-3 methylimidazolium tetrafluoroborate in the sodium silicate electrolyte system after 3-methylimidazolium tetrafluoroborate is 0, 1%, and 2%, respectively, thereby obtaining three kinds of magnesium Lithium alloy anodizing electrolyte. The three kinds of magnesium-lithium alloy anodic oxidation electrolytes are used for anodic oxidation, the magnesium-lithium alloy workpiece is used as the anode, and the stainless steel or lead plate is used as the cathode, and the constan...

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Abstract

The invention discloses an ion liquid assisted magnesium lithium alloy anodic oxidation film forming method. The method comprises the following steps: magnesium lithium alloy workpieces are used as anodes, and stainless steel or lead plates are used cathodes; ion liquid is fed in a sodium silicate electrolyte system; a constant-current mode or a constant-pressure mode is adopted for anodic oxidation; gaps between the anodes and the cathodes are controlled with 1-10 cm; the anodic oxidation time is within 10 min to 1 h, and the temperature is 5-25 DEG C; the cleaning and the drying are performed after the anodic oxidation to prepare the magnesium lithium alloys after the anodic oxidation; and the ion liquid is 1-butyl-3 methylimidazolium tetrafluoroborate, 1-caproyl-2, 3-dimethylimidazole fluophosphate or N-ethyl pyridine tetrafluoroborate. The method achieves excellent film forming performances, can prepare uniform and compact white oxide films, and is excellent in bonding force between film layers and basal bodies, excellent in corrosion resistance, excellent in wear resistance, simple in preparation process and low in energy consumption.

Description

technical field [0001] The invention relates to the technical field of surface treatment of magnesium-lithium alloys, in particular to an ionic liquid-assisted anodic oxidation film-forming method of magnesium-lithium alloys. Background technique [0002] Magnesium-lithium alloy is currently the lightest metal structure material, with high specific strength, specific stiffness, excellent electrical conductivity, thermal conductivity and damping properties, and has broad application prospects. However, since both magnesium and lithium are extremely active metal elements, magnesium-lithium alloys with high lithium content will undergo strong uniform corrosion in humid and corrosive environments, which limits the practical application of magnesium-lithium alloys. In order to improve the corrosion resistance of magnesium-lithium alloys, it is particularly important to carry out surface treatment. [0003] At present, the main surface treatment method of magnesium-lithium alloy ...

Claims

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Application Information

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IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 张优李浙锋张雪芹陈飞刘欣田昊阅
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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