Aluminum alloy anodic oxidation electrolyte solution and technology based on corrosion inhibitors

A technology of anodic oxidation and corrosion inhibitor, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of low slow release rate, high price, large dosage, etc., achieve simple process and improve corrosion resistance , easy-to-implement effect

Inactive Publication Date: 2017-08-25
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that when the content of molybdate and phosphate is low, the sustained release rate is low, and the protection effect cannot meet the requirements of actual production
In view of the low corrosion inhibition rate, large dosage and high price of adding a single corrosion inhibitor,

Method used

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  • Aluminum alloy anodic oxidation electrolyte solution and technology based on corrosion inhibitors
  • Aluminum alloy anodic oxidation electrolyte solution and technology based on corrosion inhibitors

Examples

Experimental program
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Embodiment 1

[0019] An aluminum alloy anodic oxidation electrolyte and oxidation process based on a corrosion inhibitor.

[0020] 1. The specific steps of the method

[0021] (1) Grinding treatment: Grind the aluminum alloy with 400#, 600#, 800#, 1000#, 1200# sandpaper in sequence, then put it into an ethanol solution for ultrasonic cleaning for 2 minutes, take it out, rinse it with distilled water, and dry it with cold air.

[0022] (2) Chemical degreasing: The concentration of NaOH solution is 40g / L, the temperature is about 50°C, stir with a magnetic stirrer at the same time, the speed is 1000r / min, the reaction time is 1min, then take it out and rinse it with distilled water, and dry it with cold wind.

[0023] (3) Pickling light: HNO 3 The concentration of the solution is 20g / L, stirred with a magnetic stirrer at room temperature, the rotation speed is 1000r / min, and the reaction time is 1min, then take it out, rinse it with distilled water, and dry it with cold wind.

[0024] (4) A...

Embodiment 2

[0029] An aluminum alloy anodic oxidation electrolyte and oxidation process based on a corrosion inhibitor.

[0030] The preparation method of the present embodiment is different from step (4) in (1) except that step (4) is different from embodiment 1, and all the other repeat the steps in embodiment 1, and concrete process is as follows:

[0031] (1), the specific steps of the method

[0032] (1) grinding treatment: repeat step (1) in (one) of embodiment 1;

[0033] (2) chemical degreasing: repeat step (2) in (one) of embodiment 1;

[0034] (3) Pickling to produce light: repeat step (3) in (1) of Example 1;

[0035] (4) Anodizing process: preparation of anodic oxidation electrolyte: the concentration of oxalic acid in the anodic oxidation electrolyte is 40g / L, then add 0.05mol / L sodium molybdate and 0.05mol / L ammonium dihydrogen phosphate to oxalic acid; anodic oxidation conditions : The anodizing temperature is 20°C, the anodizing voltage is 45V, and the reaction time is ...

Embodiment 3

[0040] An aluminum alloy anodic oxidation electrolyte and oxidation process based on a corrosion inhibitor.

[0041] The preparation method of the present embodiment is different from step (4) in (1) except that step (4) is different from embodiment 1, all the other repeat the steps in embodiment 1, and concrete process is as follows:

[0042] (1), the specific steps of the method

[0043] (1) grinding treatment: repeat step (1) in (one) of embodiment 1;

[0044] (2) chemical degreasing: repeat step (2) in (one) of embodiment 1;

[0045] (3) Pickling to produce light: repeat step (3) in (1) of Example 1;

[0046] (4) Anodizing process: prepare anodic oxidation electrolyte: the concentration of oxalic acid in the anodic oxidation electrolyte is 40g / L, then add 0.02mol / L sodium molybdate and 0.02mol / L ammonium dihydrogen phosphate to oxalic acid; anodic oxidation conditions : The anodizing temperature is 18°C, the anodizing voltage is 50V, and the reaction time is 90min. At ...

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Abstract

The invention discloses an aluminum alloy anodic oxidation electrolyte and oxidation process based on a corrosion inhibitor. The concentration of oxalic acid in the anodic oxidation electrolyte is 40g / L, and a corrosion inhibitor is added to the oxalic acid. The corrosion inhibitor is sodium molybdate and ammonium dihydrogen phosphate, and the concentration range is 0.005-0.1mol / L. The steps of the oxidation process are: grinding, chemical degreasing, pickling, anodizing process, sealing treatment, and finally complete the entire anodizing process to grow an oxide film on the aluminum alloy substrate; the concentration of oxalic acid in the electrolyte during the anodizing process is 40g / L, then add a corrosion inhibitor to oxalic acid, the corrosion inhibitor is sodium molybdate and ammonium dihydrogen phosphate, the concentration range is 0.005 ~ 0.1mol / L; anodizing process conditions: anodizing temperature is 15 ~ 20 ℃ , the anodic oxidation voltage is 30-50V, and the reaction time is 60-150min. In the present invention, the two corrosion inhibitors are mixed and added into the anodic oxidation electrolyte in a small amount, and their synergistic effect can greatly improve the corrosion resistance of the aluminum alloy and significantly reduce the production cost.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion of aluminum alloys, and in particular relates to a method for growing an oxide film on an aluminum alloy substrate by anodic oxidation technology, and at the same time relates to an oxide film formed by adding a corrosion inhibitor to an anodic oxidation solution by using the method. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in the industry. Due to its low relative density, weldability, easy forming processing, high mechanical strength, and high temperature resistance, it is widely used in aerospace, automobiles, construction, etc. industry. However, aluminum metal is a relatively active metal, and the oxide film formed under natural conditions is very thin, and its corrosion resistance is not high in a highly corrosive environment, which cannot meet the requirements of actual production. In addition, pitting corrosion usually...

Claims

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Application Information

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IPC IPC(8): C25D11/10C25D11/16C25D11/24
CPCC25D11/10C25D11/16C25D11/246
Inventor 王文博谢欢悦岳森何健程杰刘胜利
Owner NANJING UNIV OF POSTS & TELECOMM
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