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A kind of electrolytic solution and the method for preparing the black film layer on the surface of magnesium alloy by using the electrolytic solution

An electrolyte preparation and electrolyte technology, which is applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of vanadium salt heavy metal pollution, poor solution stability, poor film consistency, etc., to reduce processing costs, High blackness value, the effect of avoiding scrapping

Active Publication Date: 2021-03-23
西安强微电气设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese patent "Magnesium Alloy Micro-arc Oxidation Electrolyte and the Process of Using the Electrolyte to Treat Black Ceramic on the Surface of Magnesium Alloy" (Application No. 201310439874.2), and the Chinese Patent "Treatment of Black Hard Micro-arc Oxidation Ceramic Film on the Surface of Magnesium Alloy" Method "" (application number 201010530357.2), the above-mentioned patents all use copper salts because of their coloring salts. During mass production, copper salts are precipitated on the cathode, which leads to the reduction of coloring ions in the solution, resulting in poor stability of the solution. The obtained film layer consistency is poor
"Electrolyte and method for preparing black ceramic film by micro-arc oxidation of magnesium alloy" (application number 201510510427.0), "A process for preparing black ceramic film with high light absorption rate by micro-arc oxidation on the surface of magnesium alloy" (application number 201310649416.1), " Magnesium alloy micro-arc oxidation low energy consumption black ceramic film and its preparation method" (application number 201210476200.5) and other patents, the coloring salts are all made of vanadium salt, which has the problem of heavy metal pollution
In addition, magnesium alloy gold is active and has flammable properties. When using existing technologies to process products with complex and precise structures, local ablation such as threaded holes, blind cavities and corners is very easy to occur, resulting in product scrapping.

Method used

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  • A kind of electrolytic solution and the method for preparing the black film layer on the surface of magnesium alloy by using the electrolytic solution
  • A kind of electrolytic solution and the method for preparing the black film layer on the surface of magnesium alloy by using the electrolytic solution
  • A kind of electrolytic solution and the method for preparing the black film layer on the surface of magnesium alloy by using the electrolytic solution

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Experimental program
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Effect test

Embodiment 1

[0052] Step 1, add 10g / L sodium hydroxide, 5g / L potassium ferrate, 5g / L potassium fluorotitanate, 9g / L potassium fluoride, 30g / L sodium hexametaphosphate, 10g / L B Glycol, 150g / L hexamethylenetetramine, obtain electrolyte; Electrolyte is fully stirred 30min at room temperature, stand-by;

[0053] Step 2. Put the AZ91D magnesium alloy computer keyboard (with an area of ​​6dm 2 ) placed in HF with a volume fraction of 15%, H with a volume fraction of 5% 2 SO 4 The cleaning time in the pretreatment solution for pickling is 0.5min, and then washed with water;

[0054] Step 3. Place the AZ91D magnesium alloy computer keyboard treated in step 2 in the pre-treatment solution for alkali washing with a concentration of 30g / L trisodium phosphate and 30g / L sodium carbonate. The temperature is controlled at 80°C, and the cleaning time is 5min, and then wash;

[0055] Step 4. Place the AZ91D magnesium alloy computer keyboard processed in step 3 in the prepared electrolyte, connect the m...

Embodiment 2

[0058] Step 1. Add 10g / L sodium hydroxide, 10g / L sodium ferrate, 1g / L potassium fluotitanate, 10g / L sodium fluoride, 20g / L ammonium dihydrogen phosphate, 20g / L Propanol, 200g / L aminotriethanol, obtain electrolyte; Electrolyte is fully stirred 30min at room temperature, stand-by;

[0059] Step 2. Place the AZ31D magnesium alloy computer case (with an area of ​​12dm 2 ) into 8% (volume fraction) HF, 6% (volume fraction) HNO 3 The cleaning time in the pretreatment solution for pickling is 0.2min, and then washed with water;

[0060] Step 3. Put the AZ31D magnesium alloy computer case treated in step 2 into 60g / L sodium hydroxide, control the temperature at 60°C, and wash it for 3 minutes, then wash it with water;

[0061] Step 4. Put the AZ31D magnesium alloy computer case processed in step 3 into the prepared electrolyte, connect the AZ31D magnesium alloy computer case to the anode of the equipment, and use stainless steel as the cathode. After connecting the power supply, per...

Embodiment 3

[0064] Step 1. Add 12g / L potassium hydroxide, 20g / L potassium ferrate, 2g / L sodium fluorotitanate, 10g / L potassium fluoride, 12g / L trisodium phosphate, 15g / L trisodium phosphate to deionized water in sequence Alcohol, 300g / L hexylidene diamine, obtain electrolyte; Electrolyte is fully stirred 30min at room temperature, stand-by;

[0065] Step 2, AZ31B magnesium alloy (area is 5dm 2 ) into 10% (volume fraction) HF, 5% (volume fraction) HNO 3 The cleaning time in the pre-pickling treatment solution is 1min, and then washed with water;

[0066] Step 3, put the AZ31B magnesium alloy treated in step 2 into the cleaning solution of 40g / L sodium carbonate and 10g / L sodium hydroxide, control the temperature at 85°C, wash for 4min, and then wash with water;

[0067] Step 4. Place the AZ31B magnesium alloy treated in step 3 in the prepared electrolyte, connect the AZ31B magnesium alloy to the anode of the equipment, and use stainless steel as the cathode. After connecting to the power...

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Abstract

The invention discloses an electrolyte and a method for preparing a black membrane on an aluminum alloy surface by using same. The electrolyte comprises 8-15 g / L of hydroxide, 10-15 g / L of fluoride, 20-30 g / L of phosphate, 4-14 g / L of ferrate, 1-5 g / L of fluorotitanate, 10-20 g / L of organic alcohol and 80-300 g / L of an ablation inhibitor, and the solvent is deionized water. The method has the advantages that higher black level can be achieved on a thinner membrane to effectively avoid the problem of the discarding of a complicated precision product caused by local ablation when the complicatedprecision product is processed.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy treatment methods, and relates to an electrolytic solution and a method for preparing a black film on the surface of a magnesium alloy with the electrolytic solution. Background technique [0002] Magnesium alloy has a series of unique advantages such as low density, high specific strength / rigidity, high damping, good thermal conductivity and electromagnetic shielding, and magnesium alloy products are easy to recycle and reuse, and have no pollution to the environment. It is called "21 "Century Green Engineering Materials" have been widely used in aerospace, national defense, automobile, 3C products and other fields. [0003] Magnesium alloy micro-arc oxidation technology is a new surface treatment technology that interacts between the magnesium alloy substrate and the solution under the action of an electric field, thereby growing a ceramic film mainly composed of magnesium oxide on the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30
CPCC25D11/024C25D11/026C25D11/30
Inventor 陈鼎李均明
Owner 西安强微电气设备有限公司
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