Corrosion-resistant conductive coating on surface of magnesium alloy and preparation method of corrosion-resistant conductive coating

A conductive coating and magnesium alloy technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problem that the protective coating cannot meet the requirements of corrosion resistance and conductivity at the same time

Active Publication Date: 2021-11-02
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem that the traditional magnesium alloy protective coating cannot meet the requirements of corrosion resistance and electrical conductivity at the same time, the invention provides a corrosion-resistant conductive coating and a preparation method thereof

Method used

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  • Corrosion-resistant conductive coating on surface of magnesium alloy and preparation method of corrosion-resistant conductive coating
  • Corrosion-resistant conductive coating on surface of magnesium alloy and preparation method of corrosion-resistant conductive coating
  • Corrosion-resistant conductive coating on surface of magnesium alloy and preparation method of corrosion-resistant conductive coating

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preparation example Construction

[0034] A kind of magnesium alloy surface corrosion-resistant conductive coating and preparation method thereof of the present invention, concrete implementation of this preparation method has the following steps:

[0035] The first step: Mechanical grinding to prepare the pre-treated surface

[0036] In order to facilitate the test, the magnesium alloy block, plate or bar was cut into 120mm×120mm×3mm square pieces or Φ100×3mm discs with a wire cutting machine, and mechanically ground with water sandpaper to remove surface scale and impurities. Ultrasonic cleaning in acetone and absolute ethanol for 10 min, and drying with cold air.

[0037] Step 2: Preparation of pre-treated surface by friction stir processing

[0038] Use a gantry-type friction stir welding machine to perform friction stir processing on the pretreated surface of the magnesium alloy obtained in the first step, select a cylindrical needle-free stirring head, and the shoulder is a double-ring structure, and the...

Embodiment 1

[0048] The first step: Mechanical grinding to prepare the pre-treated surface

[0049] For the convenience of the test, the AZ31 magnesium alloy block was cut into square pieces of 120mm×120mm×3mm by a wire cutting machine, mechanically ground with water sandpaper to remove surface scale and impurities, and ultrasonically cleaned in acetone and absolute ethanol for 10 minutes respectively. Air dry.

[0050] Step 2: Preparation of pre-treated surface by friction stir processing

[0051] The gantry friction stir welding machine is used to perform friction stir processing on the pretreated surface of AZ31 magnesium alloy obtained in the first step. The cylindrical needleless stirring head is selected, and the shoulder is a double ring structure. The diameter of the shoulder is 8mm, and the shoulder is pressed down. The volume is 0.1 mm, the rotation speed of the stirring head is 1400 rpm, the translational speed of the stirring head is 250 mm / min, and the distance between passes...

Embodiment 2

[0068] The first step: Mechanical grinding to prepare the pre-treated surface

[0069] For the convenience of the test, the ZK60 magnesium alloy plate was cut into square pieces of 120mm×120mm×3mm with a wire cutting machine, mechanically ground with water sandpaper to remove surface scale and impurities, ultrasonically cleaned in acetone and absolute ethanol for 10 minutes, and cold air blow dry.

[0070] Step 2: Preparation of pre-treated surface by friction stir processing

[0071] The gantry friction stir welding machine is used to perform friction stir processing on the pretreated surface of the ZK60 magnesium alloy obtained in the first step. The cylindrical needleless stirring head is selected, and the shoulder is a double ring structure. The diameter of the shoulder is 9mm, and the shoulder is pressed down. The volume is 0.1 mm, the rotation speed of the stirring head is 1600 rpm, the translational speed of the stirring head is 270 mm / min, and the distance between pas...

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Abstract

The invention provides a corrosion-resistant conductive coating on the surface of a magnesium alloy and a preparation method of the corrosion-resistant conductive coating. The magnesium alloy is a common commercial AZ-series, ZK-series, WE-series and other as-cast, rolled and extruded magnesium alloy. The corrosion-resistant conductive coating is a double-layer-structure composite coating containing ATO, PANI and Graphene at the same time, the inner layer is an ATO-doped silicate-based micro-arc oxidation layer, the outer layer is an electrochemical deposition layer which is prepared through a cyclic voltammetry method and contains PANI and Graphene, and the thickness of the coating ranges from 8.5 micrometers to 20.6 micrometers. The preparation method comprises the steps of mechanical grinding, friction stir processing, micro-arc oxidation, cyclic voltammetry and annealing treatment. The magnesium alloy with the outer surface coated with the corrosion-resistant conductive coating prepared through the method provided by the invention can be used in the field of military electronic equipment.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal materials, and in particular relates to a corrosion-resistant conductive coating on the surface of a magnesium alloy and a preparation method thereof. Background technique [0002] As the lightest metal structural material, magnesium alloy has the advantages of low density, high specific strength and specific stiffness, easy cutting, good electrical and thermal conductivity, excellent damping and shock absorption, electromagnetic shielding, and easy recycling. It is widely used in national defense and military industries. The field has broad application prospects. However, the chemical properties of magnesium alloy are very active, and the spontaneously formed magnesium oxide film on its surface is loose and porous, which is easily dissolved in the atmospheric environment or in corrosive media and loses structural integrity, resulting in failure due to the decline in mechanic...

Claims

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Application Information

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IPC IPC(8): C25D9/02C25D5/18C25D5/50C25D11/30B23K20/12
CPCC25D9/02C25D5/50C25D5/18C25D11/026C25D11/024C25D11/30C25D5/623B23K20/1215
Inventor 郑洋张璇于镇洋
Owner TIANJIN POLYTECHNIC UNIV
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