Preparation method of self-healing conversion film coated with rare earth elements on the surface of magnesium-aluminum alloy

A magnesium-aluminum alloy and rare earth element technology, which is applied in the field of self-repairing conversion coating preparation, can solve the problems of micropores in the coating, and achieve the effects of increasing the content of corrosion inhibitors, preventing micropores, and improving corrosion resistance

Active Publication Date: 2017-10-27
HARBIN ENG UNIV
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  • Summary
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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the conversion coating obtained by the existing method will be locally corroded in a corrosive environment, but the high content of rare earths will cause micropores in the coating, and provides a microcapsule on the surface of a magnesium-aluminum alloy Preparation method of self-repairing conversion film coated with rare earth elements

Method used

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  • Preparation method of self-healing conversion film coated with rare earth elements on the surface of magnesium-aluminum alloy
  • Preparation method of self-healing conversion film coated with rare earth elements on the surface of magnesium-aluminum alloy
  • Preparation method of self-healing conversion film coated with rare earth elements on the surface of magnesium-aluminum alloy

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specific Embodiment approach 1

[0025] Specific implementation mode 1: In this implementation mode, the preparation method of the rare earth element self-repairing conversion film coated with microcapsules on the surface of magnesium-aluminum alloy is as follows:

[0026] 1. Add gelatin to water and stir at 35-55°C for 10 minutes to obtain an aqueous gelatin solution with a concentration of 10-20 g / L;

[0027] Add gum arabic to water and stir at 40°C for 10 minutes to adjust the pH to 5-6.5 to obtain a 20-40 g / L aqueous solution of gum arabic;

[0028] 2. Add the gum arabic aqueous solution to the gelatin aqueous solution under stirring conditions, stir for 10-20min, the volume ratio of the gum arabic aqueous solution to the gelatin aqueous solution is 1:1, and then add the rare earth ion solution with a concentration of 5-10g / L, Stir at room temperature for 6 hours to obtain a microcapsule solution coated with a sustained-release agent;

[0029] 3. Add the microcapsule solution coated with slow-release age...

specific Embodiment approach 2

[0032] Embodiment 2: This embodiment differs from Embodiment 1 in that in step 1, HCl with a mass concentration of 36% is used to adjust the pH value. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the ions in the rare earth ion solution described in step 2 are cerium ions. Others are the same as those in the first or second embodiment.

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Abstract

The invention provides a preparation method for a micro-capsule-coated rare earth element self-repairing conversion coating on the surface of magnesium-aluminum alloy and belongs to the field of preparation methods of self-repairing conversion coatings. The self-repairing conversion coating aims to solve the technical problems that according to a conversion coating obtained through an existing method, local corrosion occurs in a corrosive environment, and micropores are formed in the coating due to high-content rare earth. The preparation method comprises the following steps that an Arabic gum aqueous solution is added into a gelatin aqueous solution, a rare earth ion solution is added, and a micro-capsule solution of coating slow-release preparations is obtained; the micro-capsule solution of the coating slow-release preparations is added into a conversion coating solution, a micro-capsule-coated rare earth conversion coating solution is obtained, magnesium alloy after being pretreated serves as a matrix, voltage as large as 12 V is applied between the matrix and a positive electrode, brushing plating is conducted at a constant speed in one direction for ten minutes, and the self-repairing conversion coating is obtained. By means of the preparation method, the content of corrosion inhibitors in the conversion coating can be increased, and micropores, caused by excessively high content of rare earth ions, of the coating can be prevented.

Description

technical field [0001] The invention belongs to a preparation method of a self-repairing conversion film. Background technique [0002] Magnesium-aluminum alloy has excellent properties such as light weight, high specific strength, good impact resistance, good thermal and electrical conductivity, and easy recycling, which makes it have broad application prospects in military, transportation, communication and other fields. However, due to its lively chemical properties and poor corrosion resistance, the wide application of magnesium alloys is seriously restricted. Chemical conversion treatment is the easiest way to improve the corrosion resistance of magnesium-aluminum alloys, but the ordinary rare-earth conversion coating will be subject to localized corrosion in a corrosive environment for a period of time, and further corrosion will damage the surface of the substrate and cause serious losses. The coating with 0.2-0.6% rare earth ions can obtain a good anti-corrosion eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/06C25D11/30
CPCC25D5/06C25D11/30
Inventor 崔秀芳宋佳慧金国刘喆孙越张丹
Owner HARBIN ENG UNIV
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