Method for preparing dense electrophoretic coating on magnesium alloy surface

An electrophoretic coating, magnesium alloy technology, applied in the direction of coating, electrolytic coating, electrophoretic plating, etc., can solve the problem of uneven surface potential of magnesium alloy, easy corrosion of magnesium alloy, etc., to solve the problem of uneven potential, electrophoretic coating Uniform, corrosion-protecting effect

Active Publication Date: 2020-01-17
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 coati

Method used

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  • Method for preparing dense electrophoretic coating on magnesium alloy surface
  • Method for preparing dense electrophoretic coating on magnesium alloy surface

Examples

Experimental program
Comparison scheme
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. The constant current electrodeposition is adopted, the current density is 10mA / cm2, and the deposition time is 30 minutes for electroplating aluminum.

[0045] (3) The FY-0216 electrophoresis raw material was continuously stirred at room temperature for 48 hours...

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 a magnesium alloy surface, and belongs to the field of metal material surface treatment. The method specifically includes the following steps that pretreatment is performed on a magnesium alloy; the magnesium alloy surface is subjected to ionic liquid electroplating with aluminum; electrophoretic paint is prepared; and the magnesium alloy surface is coated with the electrophoretic paint. Before coating with the electrophoretic coating, aluminum plating is deposited on the magnesium alloy surface through ionic liquid electroplating, electrophoretic coating is performed on the prepared aluminum plating, the aluminum plating can effectively solve the problems that the magnesium alloy surface is non-uniform in potential and the magnesium alloy is prone to corrosion in an electrophoretic liquid, and thus the prepared electrophoretic coating is denser. According to the method, the production process is simple and efficient, the requirements for the whole experimental process are not high, the prepared magnesium alloy surface is uniform, dense and flat in electrophoretic coating, and the magnesium alloy canbe effectively protected against the harm caused by corrosion. The result of a neutral salt spray test indicates that the magnesium alloy surface is not corroded after being located in the neutral salt spray environment for 500 h, and the electrophoretic coating is complete and free of 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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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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