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Preparation method of cerium-based coating on magnesium alloy surface

A magnesium alloy and cerium-based technology is applied in the field of preparation of cerium-based coatings on the surface of magnesium alloys. The effect of high corrosion resistance

Active Publication Date: 2022-03-22
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical conversion coating is generally soft and thin, and its protection value is small, which cannot meet the anti-corrosion requirements of magnesium alloys under actual harsh service conditions.

Method used

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  • Preparation method of cerium-based coating on magnesium alloy surface
  • Preparation method of cerium-based coating on magnesium alloy surface
  • Preparation method of cerium-based coating on magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Set the exposed surface area to 1cm 2 The magnesium alloy material first uses 1000# sandpaper and 2.5 μm Al 2 o 3 The polishing powder is polished and polished, and acetone and secondary deionized water are used for degreasing and cleaning; then the processed magnesium alloy material is placed in 0.01mol / L Ce(NO 3 ) 3 and 1ml / L 30% H 2 o 2 In the mixed solution, soak for 10min at 20°C; then place the soaked magnesium alloy material in a mixture of 10g / L sodium hydroxide, 2g / L boric acid, 4g / L sodium borate, 2g / L tricitric acid Sodium, 0.5g / L phenol, 6g / L sodium silicate and 10g / L triethanolamine are used for anodic oxidation treatment. The oxidation voltage is: 80V, the oxidation time is: 1min, and the oxidation temperature is: 5°C; finally, the obtained magnesium alloy material is rinsed with secondary deionized water, and dried with hot air. The appearance of the cerium-based coating on the surface of the obtained magnesium alloy is as follows: figure 1 As show...

Embodiment 2

[0024] Set the exposed surface area to 1cm 2 The magnesium alloy material first adopts 1000# sandpaper and 5 μ m Al 2 o 3 The polishing powder is polished and polished, and acetone and secondary deionized water are used for degreasing and cleaning; then the processed magnesium alloy material is placed in 0.1mol / L Ce(NO 3 ) 3 and 10ml / L 30% H 2 o 2 In the mixed solution, soak for 50min at 50°C; then place the soaked magnesium alloy material in a mixture of 100g / L sodium hydroxide, 20g / L boric acid, 40g / L sodium borate, and 20g / L tricitric acid Sodium, 4g / L phenol, 6g / L sodium silicate and 10g / L triethanolamine were used for anodic oxidation treatment, the oxidation voltage was 120 V, the oxidation time was 5 minutes, and the oxidation temperature was 50 °C; finally, the obtained magnesium alloy material was rinsed with deionized water twice, and dried with hot air.

Embodiment 3

[0026] The main difference between this embodiment and embodiment 1 is that sodium silicate is not added, and the rest of the steps are the same as in embodiment 1.

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Abstract

The invention discloses a method for preparing a cerium-based coating on the surface of a magnesium alloy, which comprises the following steps: (1) performing pretreatment on the magnesium alloy material to be processed, including grinding and polishing, degreasing, cleaning and drying; (2) The pretreated magnesium alloy material is placed in the +3 (3) Perform electrochemical anodic oxidation treatment on the magnesium alloy material obtained in step (2), wash and dry. The inventive method has the characteristics of simple preparation process, low cost, environmentally friendly chemical reagents, stable product structure and performance, and the obtained composite coating has good compactness and high mechanical strength. Compared with the method of preparing magnesium alloy coating by single film-forming technology and anodic oxidation technology, the prepared cerium-based coating can effectively make up for the defects of the single method, and not only has high corrosion resistance, but also wear resistance High damage strength.

Description

technical field [0001] The invention relates to the technical field of metal material plating, in particular to a method for preparing a cerium-based coating on the surface of a magnesium alloy. Background technique [0002] Magnesium alloys are widely used in automobile manufacturing, aerospace science and industry and other fields because of their light weight, high shock absorption performance, high specific strength, die casting, good machinability and regeneration, high heat dissipation and environmental friendliness. However, magnesium alloy also has the characteristics of high electrochemical activity and low potential. It is easily oxidized in the air and the protection of the oxide film is poor. This phenomenon of poor corrosion resistance also limits its wide application to a large extent. At present, the methods to improve the corrosion resistance of magnesium alloys mainly include two aspects. One is to improve the purity of magnesium alloys, that is, to optimize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C23C22/68C23C22/78
CPCC25D11/30C23C22/68C23C22/78
Inventor 杜小青聂宝华陈东初罗铭强聂德键李辉
Owner FOSHAN UNIVERSITY