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Preparation method of magnesium alloy phosphate/fatty acid salt composite superhydrophobic anti-corrosion film

A technology of fatty acid salt and phosphate, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve problems such as difficult to meet engineering needs and unsatisfactory corrosion resistance, and achieve quality improvement and good quality. Effect of superhydrophobicity and enhanced corrosion resistance

Inactive Publication Date: 2017-04-19
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of magnesium alloys is that the corrosion resistance is not satisfactory
[0006] Phosphate conversion coating is a kind of corrosion-resistant coating that is easy to operate and can significantly improve the corrosion resistance of magnesium alloys, but it is still difficult to meet the actual engineering needs.

Method used

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  • Preparation method of magnesium alloy phosphate/fatty acid salt composite superhydrophobic anti-corrosion film
  • Preparation method of magnesium alloy phosphate/fatty acid salt composite superhydrophobic anti-corrosion film
  • Preparation method of magnesium alloy phosphate/fatty acid salt composite superhydrophobic anti-corrosion film

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Experimental program
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Effect test

Embodiment 1

[0027] 1) 1. Roughly grind the magnesium alloy sample with 400 mesh to 600 mesh water-resistant sandpaper on the polishing machine; 2. Finely grind the magnesium alloy sample with 2000 mesh to 2500 mesh water-resistant sandpaper; 3. Use acetone and analytically pure Ultrasonic cleaning of the finely ground magnesium alloy sample with alcohol for 10 minutes, and then drying with cool wind; 4. Finally, phosphating treatment is carried out in a solution composed of phosphate, manganese salt, phosphoric acid, and deionized water.

[0028] 2) Perform phosphate conversion treatment. The concentration of phosphate in the conversion treatment liquid is 150g / L, and the concentration of manganese salt is 40g / L. The phosphate is K with a mass ratio of 1:1:1 2 HPO 4 , Ca 3 (PO 4 ) 2 and Na 2 HPO 4 mixture, the manganese salt is KMnO 4 . During the conversion treatment process, a multifunctional constant temperature magnetic stirrer was used to maintain a constant temperature and ...

Embodiment 2

[0034] 1) 1. Roughly grind the magnesium alloy sample with 400 mesh to 600 mesh water-resistant sandpaper on the polishing machine; 2. Finely grind the magnesium alloy sample with 2000 mesh to 2500 mesh water-resistant sandpaper; 3. Use acetone and analytically pure Ultrasonic cleaning of the finely ground magnesium alloy sample with alcohol for 10 minutes, and then drying with cool wind; 4. Finally, phosphating treatment is carried out in a solution composed of phosphate, manganese salt, phosphoric acid, and deionized water.

[0035] 2) Perform phosphate conversion treatment. The concentration of phosphate in the conversion treatment liquid is 120g / L, and the concentration of manganese salt is 30g / L. The phosphate is K with a mass ratio of 1:1:1 2 HPO 4 , Ca 3 (PO 4 ) 2 and Na 2 HPO 4 mixture, the manganese salt is KMnO 4 . During the conversion process, a multifunctional constant temperature magnetic stirrer was used for constant temperature and stirring treatment. ...

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Abstract

The invention provides a production method of a magnesium alloy phosphate / fatty acid salt composite super-hydrophobic corrosion resistant membrane. The method comprises the following steps: 1, carrying out phosphate conversion treatment on the surface of magnesium alloy to form a phosphate conversion base layer with rough characteristic and uniform microscopic crack distribution; and 2, electro-depositing the super-hydrophobic membrane on the surface of the magnesium alloy phosphate conversion base layer obtained in step. The membrane electro-deposited on the phosphate conversion base layer preferably deposits in cracks uniformly distributed in the phosphate conversion base layer to form a fatty acid salt and phosphate base layer inlaid structure, and the structure finally covers the phosphate conversion base layer. Deposition growth promotes the effective combination of the phosphate conversion base layer with the super-hydrophobic membrane in order to form the composite membrane. The contact angle and the roll angle of the composite membrane are greater than 160DEG and about 2DEG respectively, the composite membrane can be well combined with the above magnesium alloy substrate, greatly reduces the contact area with a corrosion medium, and substantially improves the corrosion resistance of the magnesium alloy.

Description

technical field [0001] The invention relates to the technical field of alloy surface treatment, in particular to a preparation method of a magnesium alloy phosphate base layer / super-hydrophobic composite film. Background technique [0002] Magnesium alloy has the following advantages: 1. Lightweight, the density of magnesium alloy is only 1.8g / cm 3 Left and right, it is the lightest metal among practical metals; 2. The relative strength is the highest, and the specific stiffness is close to aluminum alloy and steel, much higher than engineering plastics; 3. Low melting point, good stability, good die-casting performance, and high dimensional accuracy of castings ; 4, good electromagnetic shielding ability, anti-radiation ability; and so on. [0003] Based on the above advantages, magnesium alloys have been widely used in the automotive industry, portable equipment, 3C and other fields. The pharmaceutical, chemical and aerospace sectors are also paying more and more attenti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00
Inventor 赵明王学良宋辉刘振云何广平
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY