Passivation solution for magnesium alloys and preparation method thereof

A technology of passivation solution and magnesium alloy, which is applied in the field of metallurgy to achieve the effect of solving pollution problems, excellent corrosion resistance, and fast film formation

Inactive Publication Date: 2016-09-21
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported chromium-free conversion treatment processes mainly include phosphate treatment, phosphate-permanganate treatment, fluorozirconate or fluorotitanate treatment, stannate treatment, molybdate or tungstate, vanadate treatment, cobalt salt treatment, etc., but compared with traditional chromate treatment technology, there is still room for improvement in improving treatment efficiency, lowering treatment temperature, and improving corrosion resistance, and it cannot replace chromate treatment technology. Chromium-free conversion treatment technology on the surface of magnesium alloy with high-efficiency film formation

Method used

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  • Passivation solution for magnesium alloys and preparation method thereof

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Effect test

Embodiment 1

[0015] A passivation solution for magnesium alloys, the passivation solution components are: sodium molybdate 2g / L, ammonium vanadate 0.5g / L, sodium silicate 3g / L, cobalt nitrate 0.2g / L, diphosphate Manganese hydrogen 5g / L, zinc oxide 5g / L, oxalic acid 2g / L, citric acid 0.2g / L, potassium chlorate 2g / L, potassium peroxide 1g / L, ammonium fluoride 12g / L, and the balance is deionized water.

[0016] The preparation method of the passivation solution for magnesium alloys comprises the following steps: (1) take deionized water to dilute oxalic acid and citric acid, then add zinc oxide, and stir while adding to make it all dissolve; (2) Add sodium molybdate, ammonium vanadate, sodium silicate, cobalt nitrate, manganese dihydrogen phosphate, potassium chlorate, potassium peroxide, ammonium fluoride and deionized water in sequence, and stir for 15 minutes; (3) then adjust the pH with hydrofluoric acid solution value to 2.

Embodiment 2

[0018] A passivation solution for magnesium alloys, the passivation solution components are: sodium molybdate 8g / L, ammonium vanadate 2.5g / L, sodium silicate 10g / L, cobalt nitrate 2g / L, dihydrogen phosphate Manganese 12g / L, zinc oxide 15g / L, oxalic acid 5g / L, citric acid 1g / L, potassium chlorate 6g / L, potassium peroxide 3g / L, ammonium fluoride 20g / L, and the balance is deionized water.

[0019] The preparation method of the passivation solution for magnesium alloys comprises the following steps: (1) take deionized water to dilute oxalic acid and citric acid, then add zinc oxide, and stir while adding to make it all dissolve; (2) Add sodium molybdate, ammonium vanadate, sodium silicate, cobalt nitrate, manganese dihydrogen phosphate, potassium chlorate, potassium peroxide, ammonium fluoride and deionized water in sequence, and stir for 30 minutes; (3) then adjust the pH with hydrofluoric acid solution value to 4.

Embodiment 3

[0021] A passivation solution for magnesium alloys, the passivation solution components are: sodium molybdate 4g / L, ammonium vanadate 1g / L, sodium silicate 5g / L, cobalt nitrate 0.5g / L, dihydrogen phosphate Manganese 7g / L, zinc oxide 8g / L, oxalic acid 2.5g / L, citric acid 0.4g / L, potassium chlorate 2.5g / L, potassium peroxide 1.5g / L, ammonium fluoride 15g / L, and the balance is deionized water.

[0022] The preparation method of the passivation solution for magnesium alloys comprises the following steps: (1) take deionized water to dilute oxalic acid and citric acid, then add zinc oxide, and stir while adding to make it all dissolve; (2) Add sodium molybdate, ammonium vanadate, sodium silicate, cobalt nitrate, manganese dihydrogen phosphate, potassium chlorate, potassium peroxide, ammonium fluoride and deionized water in sequence, and stir for 20 minutes; (3) then adjust the pH with hydrofluoric acid solution value to 2.5.

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Abstract

The invention discloses a passivation solution for magnesium alloys and a preparation method thereof. The passivation solution is prepared from sodium molybdate, ammonium vanadate, sodium silicate, cobalt nitrate, manganous dihydrogen phosphate, zinc oxide, oxalic acid, citric acid, potassium chlorate, potassium peroxide, ammonium fluoride, hydrofluoric acid and deionized water. The preparation method comprises the following steps of firstly, using an oxalic acid and citric acid solution to dissolve the zinc oxide; then adding other components; and using a hydrofluoric acid solution to adjust a pH (Potential Of Hydrogen) value. The passivation solution for the magnesium alloys provided by the invention adopts vanadate, molybdate, silicate and the like as raw materials, and does not contain heavy metal chromium polluting the environment, so that the problem that a passivation technology containing chromium pollutes the environment is fundamentally solved, and the passivation solution is beneficial to environmental protection; and in addition, according to the passivation solution for the magnesium alloys provided by the invention, metallic oxide and fluoride composite films can be generated on the surfaces of the magnesium alloys, and the corrosion resistance of the composite passivation films is excellent, and can be same as or even higher than the corrosion resistance of chromium passivation films.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a passivation solution for magnesium alloys and a preparation method thereof. Background technique [0002] Because magnesium alloy material is a light structural material, the quality is 2 / 3 of aluminum and 1 / 4 of steel. Compared with steel, aluminum, plastic and other engineering materials, magnesium alloy has good strength and rigidity, and good electromagnetic shielding performance , non-magnetic; good shock absorption; non-toxic, recyclable; excellent machining performance, high die-casting productivity, small size shrinkage, and has excellent low temperature performance and high thermal conductivity, so it is widely used. At present, it has become the main material in electronic products such as notebook computers, mobile phones, PDAs, etc., and the application range of magnesium alloys has rapidly expanded. [0003] The chemical conversion coating on the surface of mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/47
CPCC23C22/47
Inventor 尤为
Owner WUXI EPIC TECH
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