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A method for surface treatment of magnesium lithium aluminum copper sacrificial anode material

A sacrificial anode and surface treatment technology, applied in the field of metal surface treatment, can solve problems such as inefficiency, parasitic corrosion, instability, etc., and achieve the effects of improving utilization, high current efficiency, and uniform surface dissolution

Active Publication Date: 2021-09-21
中国电建集团江西省电力设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in terms of application, there are still problems such as insufficient efficiency, durability, and unstable electrochemical quality. In order to meet the use requirements of magnesium alloy sacrificial anode materials under different conditions, it is necessary to develop new anode materials with excellent performance and mature and reliable anode manufacturing processes.
[0003] Ordinary magnesium alloys contain a certain amount of impurity elements such as Si, Fe, Cu and Ni, and these elements have high potentials, which are easy to cause parasitic corrosion and reduce the corrosion efficiency of magnesium alloy anodes. These elements react with magnesium and distribute in the crystal form in a network form. It is easy to form a micro-battery with the magnesium matrix, accelerate the consumption of sacrificial anode materials, and make the anode consumption uneven, affecting the service life and utilization of sacrificial anode materials

Method used

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  • A method for surface treatment of magnesium lithium aluminum copper sacrificial anode material
  • A method for surface treatment of magnesium lithium aluminum copper sacrificial anode material

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Embodiment 1

[0021] The alloy surface treatment described in this embodiment includes the following process steps: (1) Polishing: use SiC sandpaper to grind and polish the magnesium-lithium-aluminum-copper alloy; (2) Sample cleaning: put the polished samples into 10mL of acetone, 30mL of absolute ethanol, and 30mL of deionized water were soaked and washed for 5 minutes; (3) Solution preparation: Take 10g of sodium chloride and add it to 400ml of distilled water and stir to dissolve, and prepare a salt solution; (4) Electrochemical corrosion treatment: put Magnesium-lithium-aluminum-copper alloy was fixed on the working electrode, the initial potential was set to -1 V, and the end point was set to 0.25 V; the step height was 3 mV, and the step time was 1 s, and then corrosion was started. Take it off; (5) Wash the sample: Put the corroded magnesium-lithium-aluminum-copper alloy in distilled water for 3 minutes and then take it out and blow dry; (6) Remove corrosion products: soak the washed ...

Embodiment 2

[0023] The alloy surface treatment described in this embodiment includes the following process steps: (1) Polishing: use SiC sandpaper to grind and polish the magnesium-lithium-aluminum-copper alloy; (2) Sample cleaning: put the polished samples into 10mL of acetone, 30mL of absolute ethanol, and 30mL of deionized water were soaked and cleaned for 5 minutes; (3) Solution preparation: Take 10g-16g of sodium chloride and add 400ml of distilled water to dissolve and stir to form a salt solution; (4) Electrochemical corrosion treatment : Fix the magnesium-lithium-aluminum-copper alloy on the working electrode, set the initial potential to -0.25 V, and set the end point to 0.25 V; the step height is 3 mV, the step time is 1 s, and then the corrosion starts. Remove the sample; (5) Wash the sample: put the corroded magnesium-lithium-aluminum-copper alloy in distilled water for 3 minutes, take it out and dry it; (6) remove corrosion products: take the washed magnesium-lithium-aluminum-...

Embodiment 3

[0025] The alloy surface treatment described in this embodiment includes the following process steps: (1) Polishing: use SiC sandpaper to grind and polish the magnesium-lithium-aluminum-copper alloy; (2) Sample cleaning: put the polished samples into 10mL of acetone, 30mL of absolute ethanol, and 30mL of deionized water were soaked and washed for 5 minutes; (3) Solution preparation: Take 16g of sodium chloride and add it to 400ml of distilled water and stir to dissolve, and prepare a salt solution; (4) Electrochemical corrosion treatment: put Magnesium-lithium-aluminum-copper alloy was fixed on the working electrode, the initial potential was set to -0.25 V, and the end point was set to 0.25 V; the step height was 3 mV, and the step time was 1 s, and then the corrosion began. Take it off; (5) Wash the sample: put the corroded magnesium-lithium-aluminum-copper alloy in distilled water for 5 minutes, and then take it out and dry it; (6) Remove corrosion products: soak the washed ...

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Abstract

A method for surface treatment of a magnesium-lithium-aluminum-copper sacrificial anode material, wherein the mass fraction content of the magnesium-lithium-aluminum-copper sacrificial anode material composition is Li: 6%-10%, Al: 3%-5%, Cu: 0.6%- 1.8%, the balance is Mg. Including the following process steps: 1) Sample polishing; 2) Sample cleaning: 3) Electrolytic solution preparation; 4) Electrochemical corrosion treatment; 5) Sample washing; 6) Corrosion product removal: 7) Ultrasonic cleaning; 8) Boiling water Processing and other eight steps. The magnesium-lithium-aluminum-copper sacrificial anode material prepared from the present invention has good porosity, the pore diameter reaches 150um, and the pore depth reaches 80-120um. The porous layer on the surface of the material is filled with aluminum alloy and formed between A gradient corrosion current has high current efficiency, uniform surface dissolution, and effectively improves the utilization rate of sacrificial anodes, and can be used for cathodic protection of metal structures in power plant grounding devices.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a method for preparing a micro-nano structure on the surface of a magnesium-lithium-aluminum-copper sacrificial anode material. Background technique [0002] The sacrificial anode method is the main method to achieve cathodic protection. The principle is that the sacrificial anode is preferentially dissolved because it is more active, and the current is released to polarize the protected metal cathode to achieve protection. At present, there are three types of sacrificial anode materials that have been successfully developed and widely used in the cathodic protection of iron and steel facilities: magnesium and magnesium alloy anodes, zinc and zinc alloy anodes, and aluminum alloy anodes. Among them, the magnesium alloy sacrificial anode has high chemical characteristics, very negative potential and low polarizability, and is suitable for fresh water wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/04C23F13/16
CPCC23F13/16C25F3/04
Inventor 尹雪梅徐思佳徐龙
Owner 中国电建集团江西省电力设计院有限公司