Treating liquid and method for preparing aluminum alloy surface hydrotalcite conversion film with self-repairing performance thereof
A technology of aluminum alloy surface and treatment liquid, which is applied in the coating process of metal materials, etc., can solve the problems of high treatment temperature, long aging and baking time, etc., and achieve low treatment temperature, short conversion treatment time and simple process flow Effect
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Embodiment 1
[0054] Example 1: Preparation of self-healing lithium aluminum hydrotalcite conversion film on aluminum alloy surface
[0055] Weigh 10 g of lithium nitrate, 2 g of lithium hydroxide, 3 g of sodium fluoride, 2 g of sodium nitrite, and 2 g of glutamic acid, and dissolve them in 1000 mL of deionized water. The above solution was adjusted to pH 10 with nitric acid.
[0056] To prepare the 5083 aluminum alloy test piece, firstly use 400, 800, 1200# sandpaper to manually polish the aluminum alloy surface, then put the aluminum alloy test piece into the self-made alkaline lotion formula for 3 minutes, wash it with deionized water, and then Immerse the aluminum alloy test piece in the commercially available aluminum alloy acid degreasing agent (60g / L) for 3 minutes, after washing with deionized water, immerse in the self-healing lithium aluminum hydrotalcite conversion coating on the surface of the aluminum alloy prepared above at a temperature of 55°C In the working solution for 20...
Embodiment 2
[0060] Weigh 10 g of lithium nitrate, 2 g of lithium hydroxide, 2 g of sodium fluoride, and 4 g of aspartic acid, and dissolve them in 1000 mL of deionized water. The pH of the above solution was adjusted to 10.5 with nitric acid.
[0061] To prepare 5083 aluminum alloy test pieces, firstly use 400, 800, 1200# sandpaper to manually polish the aluminum alloy surface, then put the aluminum alloy test pieces into the homemade alkaline lotion formula (NaOH20g / L, white cat washing powder 6g / L) for 5 minutes, after deionized water washing, then immerse the aluminum alloy test piece in the aluminum alloy acid degreasing agent (63% nitric acid 60g / L) for 5 minutes, after deionized water washing, immerse the above-mentioned prepared temperature at 60 The self-healing lithium-aluminum hydrotalcite conversion coating on the aluminum alloy surface was treated in the working solution for 20 minutes, the test piece was washed with water and dried with cold wind, baked in a drying oven at 9...
Embodiment 3
[0065] Weigh 10 g of lithium nitrate, 2.5 g of lithium hydroxide, 5 g of sodium fluoride, 1 g of sodium nitrite, and 1.6 g of glutamine, and dissolve them in 1000 mL of deionized water. The pH of the above solution was adjusted to 10.5 with nitric acid.
[0066] To prepare the 6N01 aluminum alloy test piece, firstly use 400, 800, 1200# sandpaper to manually polish the aluminum alloy surface, then put the aluminum alloy test piece into the self-made alkaline lotion formula for 3 minutes, after washing with deionized water, then Immerse the aluminum alloy test piece in the commercially available RS-228 acidic degreasing agent (60g / L) for 3 minutes, after washing with deionized water, immerse in the prepared aluminum alloy surface self-healing lithium aluminum hydrotalcite transformation at a temperature of 60°C Membrane treatment: In the working solution for 20 minutes, the test piece was washed with water and dried with cold wind, baked in a drying oven at 105°C for 20 minutes,...
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