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Magnesium alloy anode oxidation method

A technology of anodizing and magnesium alloys, applied in the direction of anodizing, can solve the problems of unsatisfactory corrosion resistance, burning of the anodized film, different reaction severity, etc., to reduce chemical corrosion, reduce alkalinity, oxide film and so on uniform effect

Active Publication Date: 2014-07-09
JIANGSU ZHONGKE YAMEI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the applicant found that when using the magnesium alloy anodic oxidation method in the prior art: if a direct current is used in the anodic oxidation step, the direct current continuously flows through the oxide film during the reaction, generating a large amount of Joule heat, and with the increase of the oxide film If the heat is not dissipated in time, it will cause the anodic oxide film to be burned; if the DC square wave pulse can solve the problem of high DC oxidation heat generation, but due to the surface of the oxide film The intensity of the reaction in each part is different, making the surface of the oxide film rough and uneven, forming a large number of raised white particles, and the porosity is large, and the corrosion resistance is not ideal

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] A method for anodizing magnesium alloys, comprising the steps of:

[0023] Degreasing: using Na 3 PO 4 10~30g / L, Na 2 CO 3 10~50g / L, OP-102~10ml / L to clean the magnesium alloy sample, remove the oil stain on the surface of the magnesium alloy, the temperature is 40~60℃, and the time is 5~15min.

[0024] Pickling: Use 3-10% dilute nitric acid solution to remove oxides and other dirt on the surface of the magnesium alloy. The temperature is room temperature and the time is 10-30s.

[0025] Alkali etching: Use 50-150g / L NaOH solution to remove the residues produced in the pickling step at a temperature of 70-100°C for 3-15 minutes.

[0026] Anodizing: The electrolyte formula used is NaOH10~100g / L, NaOH 2 SiO 3 10~100g / L and trisodium citrate 2~30g / L. The operating frequency is 300Hz, the positive pulse duty cycle is 10%, the negative pulse duty cycle is 10%, and the positive pulse current density is 1.5A / dm 2 , negative pulse current density 3A / dm 2 , a temperatur...

Embodiment 2

[0030] A method for anodizing magnesium alloys, comprising the steps of:

[0031] Degreasing: using Na 3 PO 4 10~30g / L, Na 2 CO 3 10~50g / L, OP-102~10ml / L to clean the magnesium alloy sample, remove the oil stain on the surface of the magnesium alloy, the temperature is 40~60℃, and the time is 5~15min.

[0032] Pickling: Use 3-10% dilute nitric acid solution to remove oxides and other dirt on the surface of the magnesium alloy. The temperature is room temperature and the time is 10-30s.

[0033] Alkali etching: Use 50-150g / L NaOH solution to remove the residues produced in the pickling step at a temperature of 70-100°C for 3-15 minutes.

[0034] Anodizing: The electrolyte formula used is NaOH10~100g / L, NaOH 2 SiO 3 10~100g / L and trisodium citrate 2~30g / L. The operating frequency is 400Hz, the positive pulse duty cycle is 5%, the negative pulse duty cycle is 10%, and the positive pulse current density is 2A / dm 2 , negative pulse current density 2A / dm 2 , a temperature o...

Embodiment 3

[0037] A method for anodizing magnesium alloys, comprising the steps of:

[0038] Degreasing: using Na 3 PO 4 10~30g / L, Na 2 CO 3 10~50g / L, OP-102~10ml / L to clean the magnesium alloy sample, remove the oil stain on the surface of the magnesium alloy, the temperature is 40~60℃, and the time is 5~15min.

[0039] Pickling: Use 3-10% dilute nitric acid solution to remove oxides and other dirt on the surface of the magnesium alloy. The temperature is room temperature and the time is 10-30s.

[0040] Alkali etching: Use 50-150g / L NaOH solution to remove the residues produced in the pickling step at a temperature of 70-100°C for 3-15 minutes.

[0041] Anodizing: The electrolyte formula used is NaOH10~100g / L, NaOH 2 SiO 3 10~100g / L and trisodium citrate 2~30g / L. The operating frequency is 400Hz, the positive pulse duty cycle is 10%, the negative pulse duty cycle is 5%, and the positive pulse current density is 1A / dm 2 , negative pulse current density 1A / dm 2 , a temperature of ...

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Abstract

The invention relates to a magnesium alloy anode oxidation method sequentially comprising degreasing, pickling, alkali corrosion, anodic oxidation and drying steps, and a pulse power supply used in the anodic oxidation step outputs AC square wave pulses. An anodic oxidation film generated in the anodic oxidation process is not burnt and the surface of the oxidation film is smooth.

Description

technical field [0001] The invention relates to the field of anodic oxidation, in particular to a magnesium alloy anodic oxidation method. Background technique [0002] Magnesium alloys are widely used in aerospace, transportation machinery and 3C industries. Due to their low chemical stability, poor corrosion resistance, and easy corrosion in atmospheric environments, magnesium alloy products must be properly surface treated to improve corrosion resistance. . [0003] At present, the commonly used surface treatment method of magnesium alloy is anodic oxidation, which can significantly improve the corrosion resistance of the magnesium alloy surface, and the magnesium alloy after treatment also has a certain wear resistance, and the porous structure of the surface of the anodized film formed after treatment can also Provides good adhesion to paint layers. [0004] However, the applicant found that when using the magnesium alloy anodic oxidation method in the prior art: if a...

Claims

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Application Information

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IPC IPC(8): C25D11/30C25D5/18
Inventor 沈钰陈秋荣
Owner JIANGSU ZHONGKE YAMEI NEW MATERIAL CO LTD
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