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Mg-Zn based alloy phosphating solution and surface phosphating method

A surface phosphating and treatment method technology, applied in the direction of metal material coating process, etc., can solve the problems of high treatment temperature, long time, high treatment cost, etc., and achieve the effect of uniform film layer, low cost and pollution reduction

Inactive Publication Date: 2010-05-19
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for mass production of castings, the processing temperature is higher, the time is longer, and the processing cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Magnesium-zinc alloy phosphating solution is: add 110g of potassium dihydrogen phosphate, 12g of potassium permanganate and 6g of citric acid into every liter of water.

[0023] The mass percentages of the components of the magnesium-zinc alloy treated in this embodiment are: 9% Zn, 4% Al, 0.2% Mn, and the balance is Mg.

[0024] Process flow of magnesium-zinc alloy surface phosphating treatment method:

[0025] (1) Mechanical pretreatment: polish the magnesium-zinc alloy with sandblasting or sandpaper, and then ultrasonically wash in distilled water at room temperature for 30 seconds;

[0026] (2) Alkali washing: wash with a compound alkali solution, the temperature is controlled at 35 ° C, the time is 10 minutes, and then ultrasonic cleaning is performed in distilled water at room temperature for 30 seconds; the compound alkali solution is: add 20 g of sodium hydroxide per liter of water A solution made of 20g of sodium carbonate;

[0027] (3) pickling: w...

Embodiment 2

[0031] Example 2: The magnesium-zinc alloy phosphating solution is: a solution prepared by adding 120 g of potassium dihydrogen phosphate, 15 g of potassium permanganate and 8 g of citric acid into every liter of water.

[0032] The mass percentages of the components of the magnesium-zinc alloy treated in this embodiment are: 12% Zn, 6.5% Al, 0.8% Si, 0.3% Mn, and the balance is Mg.

[0033] Process flow of magnesium-zinc alloy surface phosphating treatment method:

[0034] (1) Mechanical pretreatment: polish the magnesium-zinc alloy with sandblasting or sandpaper, and then ultrasonically wash it in distilled water at room temperature for 40 seconds;

[0035] (2) Alkali washing: wash with a compound alkali solution, the temperature is controlled at 40°C, the time is 8 minutes, and then ultrasonic cleaning is performed in distilled water at room temperature for 40 seconds; the compound alkali solution is: add 25g of sodium hydroxide per liter of water A solution made with 25g ...

Embodiment 3

[0040] Example 3: The magnesium-zinc alloy phosphating solution is a solution prepared by adding 130 g of potassium dihydrogen phosphate, 18 g of potassium permanganate and 10 g of citric acid per liter of water.

[0041] The mass percentages of the components of the magnesium-zinc alloy treated in this embodiment are: 6% Zn, 3% Al, 6% Si, 0.4% Mn, 0.08% AlP, and the balance is Mg.

[0042] Process flow of magnesium-zinc alloy surface phosphating treatment method:

[0043] (1) Mechanical pretreatment: polish the magnesium-zinc alloy with sandblasting or sandpaper, and then ultrasonically wash it in distilled water at room temperature for 50 seconds;

[0044](2) Alkali washing: wash with a compound alkali solution, the temperature is controlled at 48 ° C, the time is 5 minutes, and then ultrasonic cleaning is performed in distilled water at room temperature for 50 seconds; the compound alkali solution is: add 30 g of sodium hydroxide per liter of water A solution made with 30g...

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Abstract

The invention discloses an Mg-Zn based alloy phosphating solution, which is prepared by adding 110-130 g of monopotassium phosphate, 12-18 g of potassium permanganate and 6-10 g of citric acid per liter of water. When in phosphorization film forming treatment, pretreated Mg-Zn based alloy is soaked in the Mg-Zn based alloy phosphating solution at 15-40 DEG C for 6-10 minutes; during soaking, the solution pH value is adjusted within 4.5-6.5 by using an H3PO4 adjusting solution; and then water washing is carried out. The Mg-Zn based alloy phosphating solution can enable the Mg-Zn based alloy to form a layer of phosphate conversion coating on the surface of the Mg-Zn based alloy, wherein the phosphate conversion coating has the advantages of favorable corrosion resistance and film adhesiveness, firm attachment to matrix, even surface, uniform film layer, no poisonous elements like Chrome and the like, and pollution free; and the surface phosphating process is simple with high efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and relates to a magnesium-zinc alloy phosphating solution and a magnesium-zinc alloy surface phosphating treatment method. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, good vibration damping performance and magnetic shielding performance, and easy recycling. It has broad application prospects in automobiles, electronics and other industries, and is known as the green metal structural material in the 21st century. However, the poor corrosion resistance of magnesium alloys seriously hinders its industrial application. Therefore, the surface protection treatment of magnesium alloy is extremely important. [0003] The surface treatment methods of magnesium alloys include metal coating method, anodic oxidation treatment, micro-arc oxidation, chemical conversion coating treatment, laser surface modification, etc. Am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07C23C22/68C23C22/78C23C22/82C22C23/02C22C23/04
Inventor 张春香关绍康王利国李少华刘涛任晨星石广新
Owner ZHENGZHOU UNIV
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