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Preparation method of corrosion-resistant self-healing coating on magnesium alloy surface based on calcium salt

A magnesium alloy, self-repairing technology, applied in the direction of surface reaction electrolytic coating, metal material coating process, coating, etc., can solve the problems of limited corrosion protection and poor corrosion resistance, and achieve low equipment requirements, thickness and The effect of uniform structure and easy mass production

Active Publication Date: 2020-04-07
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a calcium salt-based corrosion-resistant self-repair coating on the surface of magnesium alloys and its preparation method, which solves the problem of poor corrosion resistance of magnesium alloys and their alloys in the prior art and the traditional surface treatment. Problems with limited corrosion protection provided by technology

Method used

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  • Preparation method of corrosion-resistant self-healing coating on magnesium alloy surface based on calcium salt
  • Preparation method of corrosion-resistant self-healing coating on magnesium alloy surface based on calcium salt
  • Preparation method of corrosion-resistant self-healing coating on magnesium alloy surface based on calcium salt

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preparation example Construction

[0026] A kind of preparation method of self-healing coating provided by the present invention, such as Figures 1 to 2 As shown, an oxide layer was prepared by micro-arc oxidation on the surface of the magnesium alloy using an electrolyte, and then a self-healing layer was prepared in an acidic solution containing calcium salts and corrosion inhibitors. Compared with the prior art, the self-healing layer provided by the present invention has a better protective effect in a corrosive environment, and has the following advantages as a workpiece: (a) a denser film layer and lower porosity; (b ) is loaded with corrosion inhibitor in the film layer, and the corrosion inhibitor can gather in the corrosion place in time when corrosion occurs, the self-repair method is sensitive, and the repair can be started in time; (c) multiple repairs in one area and simultaneous repairs in multiple areas can be realized, and automatic The repair method is sensitive, and the repair is started in t...

Embodiment 1

[0037] In this example, it is made by micro-arc oxidation and deposition in an acidic solution containing calcium salt and corrosion inhibitor on the surface of magnesium alloy using electrolyte solution. Follow the steps below to implement:

[0038] Step 1: Select AM50 magnesium alloy as the base material, and configure the micro-arc oxidation growth electrolyte composition: sodium silicate 20g / L, potassium fluoride 4g / L, and sodium hydroxide to adjust the pH value to 12;

[0039] Step 2: Use the metal substrate on which the oxide film needs to grow as the anode, and the graphite plate as the cathode, and adjust the distance between the cathode and anode to be 200mm;

[0040] Step 3: Select the constant current mode, the current density is 2A / dm 2 , the regulation pulse frequency is 300Hz, and the pulse duty cycle is 30%;

[0041] Step 4: Prepare the acidic calcium salt solution with the following components: calcium nitrate 30g / L, barbituric acid 0.01mol / L, nitric acid to ...

Embodiment 2

[0043]In this example, it is made by micro-arc oxidation and deposition in an acidic solution containing calcium salt and corrosion inhibitor on the surface of magnesium alloy using electrolyte solution. Follow the steps below to implement:

[0044] Step 1: Select AM50 magnesium alloy as the base material, and configure the micro-arc oxidation growth electrolyte composition: sodium silicate 20g / L, potassium fluoride 4g / L, and sodium hydroxide to adjust the pH value to 12;

[0045] Step 2: Use the metal substrate on which the oxide film needs to grow as the anode, and the graphite plate as the cathode, and adjust the distance between the cathode and anode to be 200mm;

[0046] Step 3: Select the constant voltage mode, the voltage value is 450V, the regulation pulse frequency is 300Hz, and the pulse duty cycle is 30%;

[0047] Step 4: Prepare the acidic calcium salt solution with the following components: calcium nitrate 30g / L, barbituric acid 0.01mol / L, nitric acid to adjust t...

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Abstract

The present invention relates to the technical field of self-repairing of materials. Disclosed is a preparation method for a calcium salt-based magnesium alloy surface corrosion-resistant self-repairing coating, capable of solving the problem in the prior art of a magnesium alloy surface coating being invalid and having poor self-repairing capability under a corrosion condition. The self-repairing coating is made of two parts and comprises an oxidation layer growing on the surface of a magnesium alloy substrate and a self-repairing layer depositing on the surface of the oxidation layer. A substrate layer is formed by performing micro-arc oxidation in an electrolyte, and the self-repairing layer is prepared by adding a corrosion inhibitor in a calcium salt solution under an acidic condition and performing deposition. The self-repairing coating prepared by the present invention has the advantages such as broad raw material sources, low costs and low processing difficulty, preparation and repeating are easy, a new protective capability can be formed in time when the coating is corroded and damaged, and accordingly, the technical problem of a conventional coating being low in protective performance under a corrosion environment is effectively solved.

Description

technical field [0001] The invention belongs to material surface treatment technology, and relates to a self-repair coating and a preparation method thereof. Background technique [0002] Magnesium alloys and their alloys are widely used due to their rich resources and recyclability. They are an important development direction of "lightweight" in the future manufacturing industry. Magnesium alloys have many advantages, such as low density, high specific strength and rigidity, good electromagnetic shielding, good castability and dimensional stability. However, the electrode potential of magnesium alloys and their alloys is relatively negative, and their corrosion resistance is poor. Therefore, only appropriate surface treatment methods are used to make them meet the corrosion protection performance requirements during use. Traditional surface treatment methods such as coating, deposited film or chemical conversion film are more complicated to deal with, have higher requireme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C23C28/04C23C22/57C23F11/02
CPCC23C22/57C23C28/04C23F11/02C25D11/026C25D11/30
Inventor 卢小鹏钱堃韩鑫鑫金勇张涛王福会
Owner NORTHEASTERN UNIV LIAONING
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