Method for one-step in-situ electro-deposition of layered double hydroxide coating on magnesium alloy surface

A technology of double hydroxide and electrodeposition layer, which is applied in the direction of electrolytic inorganic material coating, etc., to achieve the effect of simple solution formula and steps, fast film formation speed, and reduced safety risks

Active Publication Date: 2019-11-22
CHINA WEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent 200910072431.8 once involved a method of electrodepositing a corrosion inhibitor anion intercalation hydrotalcite film on the surface of a magnesium alloy. Although this patent involves an electrodeposition method, it is pre-prepared to obtain an anion intercalation LDH powder containing a corrosion inhibitor. Electrodeposition is then performed, this method deposits ex situ

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  • Method for one-step in-situ electro-deposition of layered double hydroxide coating on magnesium alloy surface

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Effect test

Embodiment 1

[0023] The method for one-step in-situ electrodeposition layered double hydroxide coating on the surface of magnesium alloy comprises the following steps:

[0024] (1) Pretreatment

[0025] Including mechanical grinding and degreasing and degreasing;

[0026] Mechanical polishing uses 600# SiC water-based sandpaper to polish and level off on the polishing machine to remove macroscopic mud sand and oxide film, etc.;

[0027] Degreasing includes acetone ultrasonic degreasing and alkaline degreasing. Acetone Ultrasonic Degreasing Put the polished magnesium alloy in acetone at room temperature for 15 minutes; alkaline degreasing uses one or more of sodium hydroxide 60g / L, phosphate 7g / L and carbonate 22g / L For the compound alkaline solution, the washing and soaking time is 12 minutes, and the temperature is 65 degrees Celsius.

[0028] (2) Preparation of electrodeposition solution and electrodeposition

[0029] Preparation of electrodeposition solution: add a certain mass of d...

Embodiment 2

[0033] The method for one-step in-situ electrodeposition layered double hydroxide coating on the surface of magnesium alloy comprises the following steps:

[0034] (1) Pretreatment

[0035] Including mechanical grinding and degreasing and degreasing;

[0036] Mechanical polishing uses 800# SiC water-based sandpaper to polish and level off on the polishing machine to remove macroscopic mud sand and oxide film, etc.;

[0037] Degreasing includes acetone ultrasonic degreasing and alkaline degreasing. Acetone Ultrasonic Degreasing Put the polished magnesium alloy in acetone for 15 minutes at room temperature; for alkaline degreasing, use one or more of sodium hydroxide 17g / L, phosphate 8g / L and carbonate 28g / L For the compound alkaline solution, the washing and soaking time is 15 minutes, and the temperature is 55 degrees Celsius.

[0038] (2) Preparation of electrodeposition solution and electrodeposition

[0039] Preparation of electrodeposition solution: add a certain mass ...

Embodiment 3

[0043] The method for one-step in-situ electrodeposition layered double hydroxide coating on the surface of magnesium alloy comprises the following steps:

[0044] (1) Pretreatment

[0045] Including mechanical grinding and degreasing and degreasing;

[0046] Mechanical polishing uses 1000# SiC water-based sandpaper to polish and level off on the polishing machine to remove macroscopic mud sand and oxide film, etc.;

[0047] Degreasing includes acetone ultrasonic degreasing and alkaline degreasing. Acetone Ultrasonic Degreasing Put the polished magnesium alloy in acetone and ultrasonic at room temperature for 15 minutes; alkaline degreasing uses one or more of sodium hydroxide 50g / L, phosphate 15g / L and carbonate 20g / L For the compound alkaline solution, the washing and soaking time is 10 minutes, and the temperature is 65 degrees Celsius.

[0048] (2) Preparation of electrodeposition solution and electrodeposition

[0049]Preparation of electrodeposition solution: add a c...

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Abstract

The invention provides a method for one-step in-situ electro-deposition of a layered double hydroxide coating on a magnesium alloy surface. The method includes the following steps that firstly, pretreatment is conducted and includes mechanical polishing and oil removing and grease removing, wherein oil removing includes acetone ultrasonic oil removing and alkaline oil removing; secondly, electro-deposition solution preparing and electro-deposition are conducted, wherein an electro-deposition solution of nitrate is prepared through distilled water, and electro-deposition is conducted in the above electro-deposition solution with a magnesium alloy being the work electrode and a platinum sheet being the counter electrode; and thirdly, the distilled water is used for flushing a sample obtainedthrough electro-deposition, the sample is dried in an oven or directly subjected to cold air blowing, and a magnesium alloy sample with an LDH film layer deposited is obtained. The method is achievedat the normal temperature and normal pressure, safety risks of production are lowered, the film forming speed is high compared with tens of hours or several tens of hours of a hydrothermal method, and LDH powder does not need to be prepared in advance or a pulse power source does not need to be used for deposition in multiple steps with various solutions.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, in particular to a method for one-step in-situ electrodeposition layered double hydroxide coating on the surface of magnesium alloy. Background technique [0002] Magnesium alloy has many advantages such as low density, high specific strength and specific stiffness, and can be recycled, so it is called "the green engineering material of the 21st century" and is widely used in the fields of automobile, aerospace and electronic communication. However, magnesium alloys also have the disadvantages of low electrode potential, high chemical activity and easy corrosion. Magnesium alloys must be properly surface treated prior to application. [0003] There are some problems in many traditional magnesium alloy surface treatment methods, such as the difficult treatment of electroplating electroless plating waste liquid, and the chromium chemical conversion coating is extremely un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/04C25D5/42
CPCC25D5/42C25D9/04
Inventor 谢治辉胡婷王佳音
Owner CHINA WEST NORMAL UNIVERSITY
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