[China Aluminum Industry Network] Method 1: Degreasing. Wipe the solvent with cotton wool to wipe it off. After removing the oil, wipe it several times with a clean cotton cloth. Commonly used solvents are: trichloroethylene, ethyl acetate, acetone, butanone, and gasoline.
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Method 2: After degreasing, chemically treat in the following solution: concentrated sulfuric acid 27.3 (mass spectrogram, the same below), potassium dichromate 7.5, water 65.2, immersed at 60-65°C for 10-30 min, and then rinse with water and allow to dry Or dry below 80°C. Or after washing in the following solution and then air-dried: phosphoric acid 10, n-butanol 3, water 20, this method is suitable for phenolic - nylon rubber, etc., with good results.
Method 3: Chemical treatment in the following solution after degreasing: ammonium hydrogen fluoride 3 to 3.5, chromium oxide 20 to 26, sodium phosphate 2 to 2.5, concentrated sulfuric acid 50 to 60, boric acid 0.4 to 0.6, water 1000, at 25 to 40°C Impregnated at a temperature of 4.5 to 6 minutes, that is, washed and dried. The method has higher bonding strength and is glued within 4 hours after treatment, and is suitable for bonding epoxy adhesive and epoxy-nitrile rubber.
Method 4: After degreasing, chemical treatment is performed in the following solutions: phosphoric acid 7.5, chromium oxide 7.5, alcohol 5.0, formaldehyde (36-38%) 80, impregnated at a temperature of 15 to 30°C for 10 to 15 minutes, and then at 60 to 80°C. Wash and dry.
Method 5: Anodizing in the following solution after degreasing: Concentrated sulfuric acid 22g/L, immersed for 10 to 15 minutes at a direct current intensity of 1 to 1.5 A/dm2, and then saturated potassium dichromate solution at 95 to Impregnation at 100°C for 5-20 minutes, followed by washing and drying.
Method 6: Chemical treatment in the following solution after degreasing: Potassium dichromate 66, Sulfuric acid (96% 666, water 1000), immersed for 10 min at 70°C, then washed with water and dried.
Method 7: After degreasing, chemically treat in the following solution: nitric acid (d=1.41) 3, hydrofluoric acid (42%) 1, immersed for 3s at 20°C and rinsed with cold water, and then heated at 65°C with hot water. Wash, rinse with distilled water, dry. This method is suitable for casting aluminum alloys with high copper content.
Method 8: After sandblasting or grinding, anodize in the following solution: chromium oxide 100, sulfuric acid 0.2, sodium chloride 0.2, raise the voltage from 0V to 10V at 40°C within 10 min, hold for 20 min, and within 5 min The temperature was raised from 10V to 50V for 5 minutes, then washed with water and dried at 700°C. Note: The concentration of free chromium oxide must not exceed 30-35g/L.
Method 9: After degreasing, chemical treatment in the following solution: sodium silicate 10, nonionic detergent 0.1, immersed at 65° C. for 5 min, then washed below 65° C., washed with distilled water and dried. This method is suitable for bonding aluminum foil.
Method 10: After degreasing, chemically treat in the following solution: sodium fluoride 1, concentrated nitric acid 15, water 84, immersed for 1 min at room temperature, washed with water and then treated in the following solution: concentrated sulfuric acid 30, sodium dichromate 7.5, water 62.5, immersed for 1 min at room temperature, washed and dried.