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Magnesium alloy phosphorization solution and magnesium alloy surface treatment method

A magnesium alloy and solution technology, which is applied in the coating process of metal materials, etc., can solve the problems of high surface resistance of magnesium alloy, low surface phosphating film binding force, poor surface phosphating film binding force, etc., and achieve low surface resistance , good bonding force, high corrosion resistance effect

Active Publication Date: 2010-02-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of high surface resistance of magnesium alloy and poor adhesion of surface phosphating film after using the magnesium alloy surface phosphating treatment method of the prior art, and provide a method that can make the surface resistance of magnesium alloy low And the magnesium alloy phosphating solution with good binding force of the surface phosphating film and the method for using the solution to treat the surface of the magnesium alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment is used to illustrate the phosphating solution and the magnesium alloy surface treatment method of the present invention.

[0023] 1. Thermal degreasing

[0024] Dissolve sodium pyrophosphate, sodium carbonate, sodium silicate, sodium hydroxide and sodium lauryl sulfate in deionized water to prepare a thermal degreasing solution, which contains 3 g / L sodium pyrophosphate, 3 g / L sodium carbonate, silicon NaOH 3 g / L, Sodium Hydroxide 3 g / L and Sodium Lauryl Sulfate 0.2 g / L.

[0025] The above solution was heated to 40°C. Then, the AZ91D magnesium alloy casting (Nanjing Yunhai Special Metals Co., Ltd.) with a size of 10 × 4 × 0.5 cm is completely immersed in the solution, and the temperature of the solution is kept at 40° C. After soaking for 2 minutes, the magnesium alloy casting is taken out and used Rinse with deionized water until no hydroxide ions are detected.

[0026] 2. Activation

[0027] Lactic acid, boric acid and tartaric acid were dissolved...

Embodiment 2

[0037] This embodiment is used to illustrate the phosphating solution and the magnesium alloy surface treatment method of the present invention.

[0038] Treat the magnesium alloy according to the same method as in Example 1, the difference is that step 4 is: phosphoric acid, calcium dihydrogen phosphate, polyethylene glycol, sodium silicate, sodium molybdate and ammonium metavanadate are dissolved in deionized water Prepare a phosphating solution containing 0.1 mole / liter of phosphoric acid, 20 grams / liter of calcium dihydrogen phosphate, 10 grams / liter of polyethylene glycol, 2 grams / liter of sodium silicate, 4 grams / liter of sodium molybdate and metavanadic acid Ammonium is 0.8 g / L, and the pH value of the solution is adjusted to 2.8 with 5 mol / L sodium hydroxide solution; the temperature of the phosphating solution is 45° C., and the soaking time is 40 seconds. The obtained magnesium alloy is designated as A2.

Embodiment 3

[0040] This embodiment is used to illustrate the phosphating solution and the magnesium alloy surface treatment method of the present invention.

[0041] The magnesium alloy is processed according to the same method as in Example 1, and the difference is that step 4 is: dissolving phosphoric acid, calcium dihydrogen phosphate, hexamethylenetetramine, tartaric acid, sodium silicate, sodium molybdate and ammonium metavanadate Prepare phosphating solution in deionized water, which contains phosphoric acid 0.08 mol / L, calcium dihydrogen phosphate 30 g / L, hexamethylenetetramine 1 g / L, tartaric acid 5 g / L, sodium silicate 1.5 g / L , sodium molybdate 2.5 g / liter and ammonium metavanadate 0.5 g / liter, the pH value of this solution is adjusted to 3 with 5 moles / liter of sodium hydroxide solution; the temperature of the phosphating solution is 50°C, and the soaking time is 20 seconds. The obtained magnesium alloy is designated as A3.

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Abstract

The invention relates to a magnesium alloy phosphorization solution, which is an aqueous solution containing phosphoric acid, calcium dihydrogen phosphate, sodium silicate, sodium molybdate and ammonium metavanadate. The invention also provides a magnesium alloy surface treatment method, which comprises a step of phosphorizing the surface of magnesium alloy by using the magnesium alloy phosphorization solution. The method uses a calcium phosphorization solution to phosphorize the surface of the magnesium alloy, does not require substances containing hexavalent chrome, fluorions and the like which are harmful to the environment and human bodies in the whole phosphorizing process, and is the environment-friendly method. The magnesium alloy surface treated by the method has high corrosion resistance, good bonding force and low surface resistance, wherein the corrosion area after 60 hours of a neutral salt spray test can reach less than 5 percent, the bonding force can reach 5B level, andthe surface resistance can be lower than 0.0002 ohm.

Description

technical field [0001] The invention relates to a magnesium alloy phosphating solution and a magnesium alloy surface treatment method. Background technique [0002] Magnesium alloy material belongs to light metal and is the lightest metal structure material. It has high specific strength and specific stiffness, and has strong absorption of impact and vibration energy. more and more widely used. Magnesium alloy is becoming the third largest metal engineering material after steel and aluminum, and is known as "green engineering material in the 21st century". [0003] However, due to its high chemical activity and low electrode potential, magnesium alloys have poor corrosion resistance and require surface treatment. Currently, surface treatment solutions for magnesium alloys can be roughly classified into solutions containing hexavalent chromium (chromate) and solutions not containing hexavalent chromium (non-chromate). The surface corrosion resistance and coating film adhes...

Claims

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Application Information

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IPC IPC(8): C23C22/42
Inventor 王勇游友圆
Owner BYD CO LTD
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