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
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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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