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Anode oxidation method

A technology of anodic oxidation and anode, which is applied in the direction of anodic oxidation, can solve the problems of poor corrosion resistance, and achieve the effect of strong corrosion resistance and improved corrosion resistance

Active Publication Date: 2011-07-06
HANGZHOU WIN WIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of anodic oxidation method that can improve the corrosion resistance of light metal materials in order to overcome the relatively poor corrosion resistance of light metal materials after the existing anodic oxidation method

Method used

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Examples

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Effect test

Embodiment 1

[0026] This example is used to illustrate the anodic oxidation method provided by the present invention.

[0027] 1. Pretreatment

[0028] (1) Grinding

[0029] The AZ91D magnesium alloy substrate (Nanjing Yunhai Special Metal Co., Ltd.) with a size of 80×50×2 mm is polished with sandpaper, and the rough natural oxide film on the surface of the magnesium alloy substrate is removed until the surface of the magnesium alloy substrate shows metal Gloss is enough.

[0030] 2. Anodizing

[0031] The above-mentioned pretreated magnesium alloy substrate is used as an anode and immersed in an electrolyte solution, and at the same time, stainless steel is used as a cathode, and the cathode and anode are respectively electrically connected to the positive and negative electrodes of the power supply. Using 2 g / L sodium hydroxide, 5 g / L sodium fluoroborate, 10 g / L sodium silicate, 0.5 g / L sodium tetraborate, 1 g / L potassium oxalate and 1 mL / L The solution composed of glycerol is used a...

Embodiment 2

[0039] This example is used to illustrate the anodic oxidation method provided by the present invention.

[0040] Prepare the AZ91D magnesium alloy base material (Nanjing Yunhai Special Metals Co., Ltd.) with the same method as Example 1 and carry out pretreatment and anodic oxidation. The difference is that the anodic oxidation adopts the following method:

[0041] The above-mentioned pretreated magnesium alloy substrate is used as an anode and immersed in an electrolyte solution, and at the same time, stainless steel is used as a cathode, and the cathode and anode are respectively electrically connected to the positive and negative electrodes of the power supply. Using 5 g / L of sodium hydroxide, 8 g / L of sodium fluoroborate, 12 g / L of sodium silicate, 1 g / L of sodium tetraborate, 1.5 g / L of potassium oxalate and 2 mL / L The solution composed of isopropylene glycol is used as the electrolyte, the power supply used is a pulse power supply, the adjustment frequency is 400 Hz, th...

Embodiment 3

[0043] This example is used to illustrate the anodic oxidation method provided by the present invention.

[0044] Prepare the AZ91D magnesium alloy base material (Nanjing Yunhai Special Metals Co., Ltd.) with the same method as Example 1 and carry out pretreatment and anodic oxidation. The difference is that the anodic oxidation adopts the following method:

[0045] The above-mentioned pretreated magnesium alloy substrate is used as an anode and immersed in an electrolyte solution, and at the same time, stainless steel is used as a cathode, and the cathode and anode are respectively electrically connected to the positive and negative electrodes of the power supply. Using 7 g / L of sodium hydroxide, 10 g / L of sodium fluoroborate, 15 g / L of sodium silicate, 3 g / L of sodium tetraborate, 2 g / L of potassium oxalate and 3 mL / L The solution composed of glycerin is used as the electrolyte, the power supply used is a pulse power supply, the adjustment frequency is 500 Hz, the duty ratio...

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Abstract

The invention provides an anode oxidation method which comprises the following steps: under the anode oxidation condition, putting light metal material in electrolyte, using the light metal material as an anode, using the conducting material which does not react with the electrolyte as a cathode, and enabling the cathode and the anode to be respectively electrically connected with a positive electrode and a negative electrode of a power source. The anode oxidation comprises constant current density anode oxidation and constant voltage anode oxidation, wherein the current density of the constant current density anode oxidation is 0.5 to 6 amperes / square decimeter, and the voltage of the constant voltage anode oxidation is 20 to 400 volts. Compared with the light metal material which is processed by the prior anode oxidation method, the corrosion resistance of the light metal material which is processed by the anode oxidation method of the invention is greatly improved, and even the light metal material which is processed by the anode oxidation method of the invention is not post-processed by plugging, the corrosion resistance of the light metal material is also stronger.

Description

technical field [0001] The invention relates to an anodic oxidation method. Background technique [0002] Light metal materials such as magnesium, aluminum, zinc, titanium, magnesium alloys, aluminum alloys, zinc alloys or titanium alloys have the advantages of low density, strong electrical and thermal conductivity, excellent mechanical properties and secondary processing, so they are widely used. However, the light metal material itself is a material that is easily corroded. Therefore, in order to make better use of the light metal material, the surface of the light metal material is usually treated to prevent its surface from being corroded. Among them, the widely used method is to treat the light metal material. Carry out anodic oxidation, the existing anodic oxidation method is generally carried out under constant current density or constant voltage. However, the corrosion resistance of light metal materials treated by the existing anodic oxidation method is still poor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/02
Inventor 谢呈德聂杰高乡明申永涂俊凯林军王强林宏业宫清
Owner HANGZHOU WIN WIN TECH CO LTD
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