Method of adopting environment-friendly nickel-containing electrolyte to prepare microarc oxidation film layer on surface of magnesium alloy

A micro-arc oxidation and nickel electrolyte technology, applied in the field of metal surface treatment, can solve the problems of complex process operation, unsuitable for economical and environmentally friendly production needs, etc., and achieve the effects of simple process operation, elimination of pulverization, and improvement of growth performance.

Active Publication Date: 2014-04-16
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The electrolytic solution used in the micro-arc oxidation method of magnesium alloys in the prior art generally contains toxic and harmful substances such as fluorine and phosphorus, and the process procedure is complicated to operate, which is not suitable for economical and environmentally friendly production needs

Method used

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  • Method of adopting environment-friendly nickel-containing electrolyte to prepare microarc oxidation film layer on surface of magnesium alloy
  • Method of adopting environment-friendly nickel-containing electrolyte to prepare microarc oxidation film layer on surface of magnesium alloy
  • Method of adopting environment-friendly nickel-containing electrolyte to prepare microarc oxidation film layer on surface of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 steps are as follows:

[0031] (1) Prepared electrolyte: sodium silicate 15g / L, sodium borate 30g / L, sodium hydroxide 30g / L, triethanolamine 15mL / L, nickel acetate 0.5g / L and ethylenediamine 5mL / L, temperature 10 ~30°C.

[0032] (2) Process parameters: pulse constant voltage power supply, current density 3A / dm 2 , frequency 400Hz, duty cycle 40%, micro-arc oxidation time 5min.

[0033] (3) Use 200 # 、400 # , 800 # , 1200 # Grind the test piece with water abrasive paper, rinse with tap water, ultrasonically wash with acetone for 5 minutes, rinse with tap water and clean with distilled water, and dry with a hair dryer.

[0034] (4) Connect the magnesium alloy treated in step (3) to the positive electrode of the micro-arc oxidation power supply, connect the stainless steel cathode to the negative electrode of the power supply, place it in the electrolyte configured in step (1), turn on the circulating cooling system and stirring system, and turn on the p...

Embodiment 2

[0037] Embodiment 2 steps are as follows:

[0038](1) Prepared electrolyte: sodium silicate 15g / L, sodium borate 30g / L, sodium hydroxide 30g / L, triethanolamine 15mL / L, nickel acetate 1g / L and ethylenediamine 0.5mL / L, temperature 10 ~30°C.

[0039] (2) Process parameters: pulse constant voltage power supply, current density 3A / dm 2 , frequency 400Hz, duty cycle 40%, micro-arc oxidation time 5min.

[0040] (3) Use 200 # 、400 # , 800 # , 1200 # Grind the test piece with water abrasive paper, rinse with tap water, ultrasonically wash with acetone for 5 minutes, rinse with tap water and clean with distilled water, and dry with a hair dryer.

[0041] (4) Connect the magnesium alloy treated in step (3) to the positive electrode of the micro-arc oxidation power supply, connect the stainless steel cathode to the negative electrode of the power supply, place it in the electrolyte configured in step (1), turn on the circulating cooling system and stirring system, and turn on the po...

Embodiment 3

[0044] Embodiment 3 steps are as follows:

[0045] (1) Prepared electrolyte: sodium silicate 30g / L, sodium borate 40g / L, sodium hydroxide 30g / L, triethanolamine 15mL / L, nickel acetate 0.5g / L and ethylenediamine 5mL / L, temperature 10 ~30°C.

[0046] (2) Process parameters: pulse constant voltage power supply, current density 3A / dm 2 , frequency 400Hz, duty cycle 40%, micro-arc oxidation time 5min.

[0047] (3) Use 200 # 、400 # , 800 # , 1200 # Grind the test piece with water abrasive paper, rinse with tap water, ultrasonically wash with acetone for 5 minutes, rinse with tap water and clean with distilled water, and dry with a hair dryer.

[0048] (4) Connect the magnesium alloy treated in step (3) to the positive electrode of the micro-arc oxidation power supply, connect the stainless steel cathode to the negative electrode of the power supply, place it in the electrolyte configured in step (1), turn on the circulating cooling system and stirring system, and turn on the p...

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Abstract

The invention discloses a method of adopting an environment-friendly nickel-containing electrolyte to prepare a microarc oxidation film layer on surface of a magnesium alloy, and belongs to the technical field of metal finishing. The method comprises the following steps: taking the magnesium alloy as an anode, and a phosphorus and fluorine-free nickel salt-containing aqueous solution electrolyte; performing microarc oxidation processing under the process conditions so as to generate a ceramic microarc oxidation film layer on the surface of the magnesium alloy material; performing routine plugging processing on the ceramic microarc oxidation film layer so as to form a high erosion-resistant and wear-resistant microarc oxidation film layer on the surface of the magnesium alloy, wherein the aqueous solution electrolyte comprises the following components: 0.5-1.5 g / L nickelous acetate or nickel sulfate, 15-30 g / L sodium silicate, 20-40 g / L sodium borate, 10-30 g / L sodium hydroxide or potassium hydroxide, 10-20 mL / L triethavolamine, and 5-10 mL / L ethylene diamine. The electrolyte contains the nickel salt, but not the phosphorus and fluorine, and is environment-friendly. The microarc oxidation film layer on the surface of the magnesium alloy is a nickeliferous ceramic film with relatively small film hole size, and has relatively high wear resistance, corrosion resistance and binding force, and therefore is wide in application.

Description

technical field [0001] The invention discloses a method for preparing a micro-arc oxidation film on the surface of a magnesium alloy by adopting an environment-friendly nickel-containing electrolyte, belonging to the technical field of metal surface treatment. Background technique [0002] Compared with other metal materials, magnesium alloy has low density, high specific strength, strong shock resistance and impact resistance, excellent thermal conductivity and anti-electromagnetic wave interference, and its processing and forming performance is good, and the material is easy to recycle. It can be widely used in automobile manufacturing, electronic communication industry, Aerospace and other industries. However, the corrosion resistance of magnesium alloys is extremely poor, and its surface exhibits extremely high chemical and electrochemical activities, and its surface hardness and wear resistance are difficult to meet high requirements for use. [0003] In recent years, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30C25D3/12
Inventor 占稳欧阳贵
Owner WUHAN RES INST OF MATERIALS PROTECTION
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