A passivation solution for surface treatment of aluminum and aluminum alloys with manganate as main salt and its application
A technology of aluminum alloy surface and manganate, which is applied in the coating process of metal materials, etc., can solve the problems of environmental pollution, environmental secondary pollution, harmful to human health, etc., achieve low equipment requirements, improve corrosion resistance, and good durability The effect of corrosion performance
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Embodiment 1
[0024] Embodiment 1: (do not add potassium fluoride and citric acid)
[0025] Example An industrial pure aluminum tube (1060) with a length of 6.00 cm and a diameter of Φ7.8×1.0 mm. Weigh 1.000g of potassium permanganate and 2.000g of disodium hydrogen phosphate, dissolve them in a 100mL volumetric flask, and adjust the pH to 9.5. Keep the temperature at 60°C, put the industrial pure aluminum tube into the solution for passivation for 10 minutes, and put it in an oven at 100°C for 1 hour to cure. Compared with the blank sample and the chromate passivation film, the manganate passivation film of the present invention has better corrosion resistance.
[0026] Using the electrochemical workstation to measure the Tafel polarization curves of different film layers, the data fitting result is: the self-corrosion current of the blank sample is 1.920×10 -4 A / cm 2 , the self-corrosion current of the chromate passivation film is 4.721×10 -5 A / cm 2 , the self-corrosion current of th...
Embodiment 2
[0027] Embodiment 2: (do not add citric acid)
[0028] Example An industrial pure aluminum tube (1060) with a length of 6.00 cm and a diameter of Φ7.8×1.0 mm. Weigh 1.000g of potassium permanganate, 2.000g of disodium hydrogen phosphate, and 0.100g of potassium fluoride, dissolve them in a 100mL volumetric flask, and adjust the pH to 9.0. Keep the temperature at 55°C, put the industrial pure aluminum tube into the solution for passivation for 10 minutes, and put it in an oven at 100°C for 1 hour to cure. Compared with blank sample and chromate passivation film, manganate passivation film has better corrosion resistance.
[0029] Using the electrochemical workstation to measure the Tafel polarization curves of different film layers, the data fitting result is: the self-corrosion current of the blank sample is 1.920×10 -4 A / cm 2 , the self-corrosion current of the chromate passivation film is 4.721×10 -5 A / cm 2 , the self-corrosion current of the manganate passivation film ...
Embodiment 3
[0031]Example An industrial pure aluminum tube (1060) with a length of 6.00 cm and a diameter of Φ7.8×1.0 mm. Weigh 1.000g of potassium permanganate, 2.000g of disodium hydrogen phosphate, 0.100g of potassium fluoride, and 0.200g of citric acid and dissolve them in a 100mL volumetric flask, and adjust the pH to 9.0. Keep the temperature at 55°C, put the industrial pure aluminum tube into the solution for passivation for 8 minutes, and put it in an oven at 100°C for 1 hour to cure. Compared with blank sample and chromate passivation film, manganate passivation film has better corrosion resistance.
[0032] Using the electrochemical workstation to measure the Tafel polarization curves of different film layers, the data fitting result is: the self-corrosion current of the blank sample is 1.920×10 -4 A / cm 2 , the self-corrosion current of the chromate passivation film is 4.721×10 -5 A / cm 2 , the self-corrosion current of the manganate passivation film is 8.658×10 -7 A / cm 2 ....
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Abstract
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