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A method for preparing dense electrophoretic coating on the surface of magnesium alloy

A technology of electrophoretic coating and magnesium alloy, applied in the direction of coating, electrolytic coating, electrophoretic plating, etc., can solve the problems of easy corrosion of magnesium alloy, uneven surface potential of magnesium alloy, etc., and achieve simple production process and uniform electrophoretic coating , undemanding effects

Active Publication Date: 2021-10-26
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention proposes that before the electrophoretic coating is applied, an aluminum coating is deposited on the surface of the magnesium alloy by means of ionic liquid electroplating, and electrophoretic coating is performed on the prepared aluminum coating. The aluminum coating can effectively solve the uneven surface potential of the magnesium alloy And the problem that the magnesium alloy is easy to corrode in the electrophoretic liquid, so that the prepared electrophoretic coating is uniform and dense, and protects the magnesium alloy from the harm of corrosion

Method used

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  • A method for preparing dense electrophoretic coating on the surface of magnesium alloy
  • A method for preparing dense electrophoretic coating on the surface of magnesium alloy

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Polish the magnesium alloy with 150-mesh, 400-mesh, 800-mesh and 1200-mesh sandpaper, rinse with deionized water, and put it into acetone for 10 minutes of ultrasonication. Weigh 25g of sodium hydroxide, 7.5g of anhydrous sodium carbonate and 1g of sodium dodecylbenzenesulfonate and dissolve them in 500mL of water to make a lye, then put the magnesium alloy into the prepared lye, and place it in a water bath environment at 60°C Alkaline wash in.

[0044] (2) Take AlCl3 and 1-butyl-3-methylimidazole (BMIC) according to the ratio of molar ratio 2:1 and mix and prepare solution, take magnesium alloy as cathode, and the aluminum flake that purity is 99.99% is anode, cathode The distance from the anode is 1 cm. Constant current electrodeposition is adopted, the current density is 10mA / cm2, and the deposition time is 30 minutes for electroplating aluminum.

[0045] (3) Stir the FY-0216 electrophoresis raw material continuously at room temperature for 48 hours to complet...

Embodiment 2

[0048](1) Polish the magnesium alloy with 150-mesh, 400-mesh, 800-mesh and 1200-mesh sandpaper, rinse with deionized water, and put it into acetone for 10 minutes of ultrasonication. Weigh 25g of sodium hydroxide, 7.5g of anhydrous sodium carbonate and 1g of sodium dodecylbenzenesulfonate and dissolve them in 500mL of water to make a lye, then put the magnesium alloy into the prepared lye, and place it in a water bath environment at 60°C Alkaline wash in.

[0049] (2) Take AlCl3 and 1-butyl-3-methylimidazole (BMIC) according to the ratio of molar ratio 2:1 and mix and prepare solution, take magnesium alloy as cathode, and the aluminum flake that purity is 99.99% is anode, cathode The distance from the anode is 2 cm. The constant current electrodeposition is adopted, the current density is 15mA / cm2, and the deposition time is 30 minutes for electroplating aluminum.

[0050] (3) Stir the FY-0216 electrophoresis raw material continuously at room temperature for 48 hours to comp...

Embodiment 3

[0053] (1) Polish the magnesium alloy with 150-mesh, 400-mesh, 800-mesh and 1200-mesh sandpaper, rinse with deionized water, and put it into acetone for 10 minutes of ultrasonication. Weigh 25g of sodium hydroxide, 7.5g of anhydrous sodium carbonate and 1g of sodium dodecylbenzenesulfonate and dissolve them in 500mL of water to make a lye, then put the magnesium alloy into the prepared lye, and place it in a water bath environment at 60°C Alkaline wash in.

[0054] (2) Take AlCl3 and 1-butyl-3-methylimidazole (BMIC) according to the ratio of molar ratio 2:1 and mix and prepare solution, take magnesium alloy as cathode, and the aluminum flake that purity is 99.99% is anode, cathode The distance from the anode is 1 cm. The constant current electrodeposition is adopted, the current density is 10mA / cm2, and the deposition time is 35 minutes for electroplating aluminum.

[0055] (3) Stir the FY-0216 electrophoresis raw material continuously at room temperature for 48 hours to com...

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Abstract

The invention discloses a method for preparing a dense electrophoretic coating on the surface of a magnesium alloy, which belongs to the field of surface treatment of metal materials. Specifically, the method comprises the following steps: pre-treating the magnesium alloy; electroplating aluminum on the surface of the magnesium alloy with an ionic liquid; preparing an electrophoretic paint; and coating the electrophoretic paint. Before the electrophoretic coating is applied, a layer of aluminum coating is deposited on the surface of the magnesium alloy by ionic liquid electroplating, and electrophoretic coating is performed on the prepared aluminum coating. The aluminum coating can effectively solve the uneven surface potential of the magnesium alloy and the The problem of easy corrosion in the electrophoretic liquid makes the prepared electrophoretic coating denser. The manufacturing process of the invention is simple and efficient, and the requirements for the whole experimental process are not high, and the electrophoretic coating on the surface of the prepared magnesium alloy is uniform, compact and smooth, which can effectively protect the magnesium alloy from the harm of corrosion. The results of the neutral salt spray test show that after 500 hours in the neutral salt spray environment, there is no corrosion on the surface of the magnesium alloy, and the electrophoretic coating is intact without damage.

Description

technical field [0001] The invention belongs to the field of surface treatment of metal materials, and in particular relates to a method for preparing a dense electrophoretic coating on the surface of a magnesium alloy. Background technique [0002] Due to its low density, high strength and specific stiffness, and excellent electrical and thermal conductivity, magnesium alloys have been widely used in aerospace, weaponry, engineering materials, and biological materials. However, the chemical properties of magnesium are relatively active, and the low standard electrode potential makes magnesium alloys very easy to be corroded. Therefore, how to improve the corrosion resistance of magnesium alloy products has become a research hotspot in recent years. [0003] Electrophoretic coating is an effective means to prevent metal corrosion. It uses the electric field force to deposit charged paint particles on the surface of metal workpieces to form a uniform protective film and achi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/44C25D5/42C25D13/20
CPCC25D3/44C25D5/42C25D13/20
Inventor 张萌闫大帅王艳力陈俐蔓王迪刘一博
Owner HARBIN ENG UNIV
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