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A kind of preparation method of double hydroxyl metal oxide sealing film layer on the surface of magnesium alloy

A technology of double hydroxyl metal and magnesium alloy, applied in anodizing and other directions, can solve the problems of complex preparation process of LDH film and insufficient research, and achieve the effects of compact and uniform size, convenient operation and environmental friendliness.

Active Publication Date: 2018-06-29
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of porous cracks on the surface of the magnesium alloy anodic oxidation film and the complex preparation process of the LDH film layer, the research is not deep enough, etc., the present invention directly uses anodic magnesium oxide as the magnesium source under the condition of safety and environmental protection to prepare the effective closed anode The Mg‐Al LDH protective film with pores in the oxide film can not only effectively seal the pores on the surface of the magnesium alloy anodic oxide film, but also avoid direct contact between the corrosive medium and the magnesium alloy substrate, so that the LDH film covered on the surface of the magnesium alloy can protect the magnesium alloy The porous layer of the alloy anodized film is effectively sealed, which effectively improves the corrosion resistance of the film layer, and has the characteristics of convenient operation, simple process and environmental friendliness

Method used

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  • A kind of preparation method of double hydroxyl metal oxide sealing film layer on the surface of magnesium alloy
  • A kind of preparation method of double hydroxyl metal oxide sealing film layer on the surface of magnesium alloy
  • A kind of preparation method of double hydroxyl metal oxide sealing film layer on the surface of magnesium alloy

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Embodiment 1

[0040] 1. Configure in situ growth solution

[0041] An in-situ growth solution of 0.05M aluminum nitrate and 0.3M ammonium nitrate was prepared, and then the pH value of the in-situ growth solution was adjusted to 10.72 with dilute ammonia water, and the temperature of the solution was adjusted to 20°C.

[0042] 2. In situ growth

[0043] The steps to carry out the AZ31 magnesium alloy substrate in sequence are: anodic oxidation step 1 of alkaline anodic oxidation solution system → flowing cold deionized water cleaning step 2 → in-situ growth solution preparation step 3 (preparing a certain pH value concentration of 0.05M, Use the PHS-3C experimental pH meter to adjust the pH value so that the pH value of the aluminum nitrate solution added with ammonium nitrate reaches 10.72) → sample cleaning step 4 (before the sample is placed in the JP-020 Jiemeng brand ultrasonic Cleaning in the cleaning machine for 5 minutes) → in-situ growth step 5 (put the high-pressure reaction kettle...

Embodiment 2

[0052] 1. Configure in situ growth solution

[0053] An in-situ growth solution of 0.05M aluminum nitrate and 0.3M ammonium nitrate was prepared, and then the pH value of the in-situ growth solution was adjusted to 12.04 with dilute ammonia water, and the temperature of the solution was adjusted to 10°C.

[0054] 2. In situ growth

[0055] The steps to carry out the AZ31 magnesium alloy substrate in sequence are: anodic oxidation step 1 of alkaline anodic oxidation solution system → flowing cold deionized water cleaning step 2 → in-situ growth solution preparation step 3 (preparing a certain pH value concentration of 0.05M, Use the PHS-3C experimental pH meter to adjust the pH value so that the pH value of the aluminum nitrate solution added with ammonium nitrate reaches 12.04) → sample cleaning step 4 (before the sample is placed in the JP-020 Jiemeng brand ultrasonic Cleaning in a washing machine for 5 minutes) → in-situ growth step 5 (put the high-pressure reaction kettle ...

Embodiment 3

[0059] 1. Configure in situ growth solution

[0060] An in-situ growth solution of 0.05M aluminum nitrate and 0.3M ammonium nitrate was prepared, and then the pH value of the in-situ growth solution was adjusted to 10.72 with dilute ammonia water, and the adjusted temperature was 30°C.

[0061] 2. In situ growth

[0062] The steps to carry out the AZ31 magnesium alloy substrate in sequence are: anodic oxidation step 1 of alkaline anodic oxidation solution system → flowing cold deionized water cleaning step 2 → in-situ growth solution preparation step 3 (preparing a certain pH value concentration of 0.05M, Use the PHS‐3C experimental pH meter to adjust the pH value so that the pH value of the aluminum nitrate solution added with ammonium nitrate reaches 10.72) → sample cleaning step 4 (before the sample is placed in the JP‐020 Jiemeng brand ultrasonic Cleaning in the cleaning machine for 5 minutes) → in-situ growth step 5 (put the high-pressure reaction kettle with the anodize...

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Abstract

The invention relates to a method for preparing a layered double hydroxide (LDH) closing film layer on the surface of magnesium alloy. According to the method, anodized magnesium is directly used as a magnesium source, and the LDH closing film layer is grown in situ on the surface of the anodized magnesium alloy through in-situ growth fluid. Holes in the surface of a magnesium alloy anodized film can be effectively closed, direct contact between corrosive media and a magnesium alloy substrate is avoided, the thickness of a protection layer is increased, and the corrosion resistance of the protection layer is obviously improved. An inorganic salt type reagent is adopted as the reagent of the method, environmental friendliness is achieved, and the reagent is sold in the market, so that the cost is low.

Description

technical field [0001] The invention belongs to the technical field of metal surface protection treatment, and relates to a surface treatment method, in particular to a method for preparing a double hydroxy metal oxide (LDH) film layer on the surface of a magnesium alloy. Background technique [0002] Magnesium alloys have low density, high alloy specific strength and specific stiffness, and good shock absorption, electrical and thermal conductivity, and damping properties. They are called "green engineering materials in the 21st century". In recent years, due to the application requirements in automotive automation, aerospace, mobile phones, and computer industries, magnesium alloys have attracted widespread attention. However, magnesium alloys are highly chemically and electrochemically active and are easily corroded, which limits the wide application of magnesium alloys. [0003] At this stage, there are two main means to improve the corrosion resistance of magnesium all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 吴量杨丹妮张根汤爱涛潘复生
Owner CHONGQING UNIV
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