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Method for electrogalvanizing on surface of magnesium lithium alloy

A magnesium-lithium alloy and electro-galvanizing technology, which is applied in the field of electro-galvanizing and electro-galvanizing on the surface of magnesium-lithium alloys, can solve problems such as strong electronegativity and difficult electroplating, and achieve the effects of improving corrosion resistance, increasing speed, and reducing costs

Inactive Publication Date: 2018-12-18
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for electroplating zinc on the surface of magnesium-lithium alloy in order to solve the problem that it is difficult to electroplate on the surface of magnesium-lithium alloy due to its strong electronegativity

Method used

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  • Method for electrogalvanizing on surface of magnesium lithium alloy
  • Method for electrogalvanizing on surface of magnesium lithium alloy

Examples

Experimental program
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Effect test

example 1

[0036] Example 1: This scheme is the best scheme. The grade of magnesium-lithium alloy used in the experiment is MBLS10A-200, which is cut into 25mm×35mm×2mm thin slices. The following examples are all performed using workpieces of this specification.

[0037] (1) Grinding: use 400-mesh, 800-mesh, and 1500-mesh sandpaper to polish the surface of the magnesium-lithium alloy substrate workpiece until the oil layer and oxide layer are removed;

[0038] (2) Degreasing: In an alkali-resistant tank with a temperature of 60°C, soak the workpiece in lye for 10 minutes to remove the residual oil layer on the surface of the workpiece. The lye includes 60g / L sodium hydroxide and 10g / L sodium phosphate. Rinse with deionized water for 3 times and proceed to the next step;

[0039] (3) Etching: In a corrosion-resistant tank at 15°C, etch the workpiece with mixed acid solution for 15s to remove the oxide layer on the surface of the workpiece. The mixed acid solution includes phosphoric aci...

example 2

[0047] In this example, the steps of activation and galvanizing before the test electroplating were changed, and the concentration and temperature of the reaction were increased to speed up the processing speed. Compared with Example 1, the difference lies in the following steps:

[0048] (1) Activation: In a corrosion-resistant tank at 75°C, soak the workpiece in the activation solution for 1 min. In this example, the activation solution formula is potassium pyrophosphate 110 / L and sodium carbonate 40g / L, and the workpiece is rinsed with deionized water for 3 times before entering the next step;

[0049] (2) Zinc dipping: In a zinc dipping tank at 75°C, immerse the workpiece in a zinc dipping solution for 3 minutes, and deposit a fine layer of zinc on the surface of the workpiece. In this example, the formula of zinc dipping solution is 30g / L of zinc sulfate, 120g / L of sodium pyrophosphate, 4g / L of sodium fluoride and 5g / L of sodium carbonate, and the workpiece is rinsed wit...

example 3

[0053] In this example, the current density of the electroplating treatment is increased to speed up the electroplating treatment speed. Compared with Example 1, the difference lies in the following steps:

[0054] (1) The first pre-galvanizing: In the electroplating tank at 30°C, electroplate the workpiece in the pre-plating solution for 10 minutes, and the current density is 2.0A / dm 2 . Pre-plating solution formula is the same as in Example 1. After the workpiece is rinsed with deionized water for 3 times, it enters the next step;

[0055] (2) The second electrogalvanizing: In the electroplating tank at 30°C, electroplate the workpiece in the electroplating solution for 10 minutes, and the current density is 2.0A / dm 2 . Electroplating solution formula is identical with example 1. After the workpiece is rinsed with deionized water for 3 times, it enters the next step;

[0056] All the other processing steps and implementation method are consistent with example one.

[...

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Abstract

The invention provides a method for electrogalvanizing on the surface of magnesium lithium alloy. The method comprises the following steps: polishing, oil removal, etching, activating, zinc immersion,first-time pre-electrogalvanizing, second-time pre-electrogalvanizing and drying. The surface of the magnesium lithium alloy is subjected to electrogalvanizing by an electroplating method, a conventional magnesium alloy surface electroplating pretreatment process is adopted, priming is implemented by a zinc immersion process, then a process of two-time electrogalvanizing is carried out, the binding force of a coating is not affected on the premise of simplifying procedures, the preparation speed of the coating is increased, and the corrosion resistance of the magnesium lithium alloy is improved; and moreover, zinc oxide and zinc sulfate serve as main salts, experimental results are good, moreover, the zinc oxide and the zinc sulfate are non-toxic and tasteless, and are low in price and wide in operation range, and the method belongs to an environmentally friendly process. By the method, the corrosion resistance of the magnesium lithium alloy is improved effectively, the cost is reduced, the method is simple to operate, batch production can be implemented, and moreover, the method can further serve as a pretreatment technology for electroplating of other metals later.

Description

technical field [0001] The invention relates to a method for electrogalvanizing, in particular to a method for electrogalvanizing the surface of a magnesium-lithium alloy, and belongs to the field of corrosion and protection of magnesium alloy materials. Background technique [0002] Lithium is added to magnesium to form the world's lightest metal structure material - magnesium-lithium alloy, which generally contains 5wt% to 16wt% lithium, and a small amount of other alloying elements, such as aluminum and zinc. Magnesium-lithium alloys have a lower density than ordinary magnesium alloys, generally 1.3g / cm 3 ~1.6g / cm 3 , has better shock absorption and electromagnetic shielding performance, and at the same time, its strength is equivalent to that of magnesium alloy, and it has obvious advantages compared with steel, titanium alloy, aluminum alloy, engineering plastics, and carbon fiber composite materials. The specific performance is as follows: 1. Ultra-light density, ult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/10C25D5/42C25D3/22C23G1/22
CPCC23G1/22C25D3/22C25D5/10C25D5/42
Inventor 王桂香王昱贺严东马福秋赵英海何津萌薛云
Owner HARBIN ENG UNIV
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