Aluminum and aluminum alloy surface treatment method

[ Method 1] Degreasing treatment. Wipe with a damp cotton dampening solvent to remove the oil, then wipe it with a clean cotton cloth several times. Commonly used solvents are: trichloroethylene, ethyl acetate, acetone, methyl ethyl ketone and gasoline.
[Method 2] Degreasing solution after the chemical treatment: concentrated sulfuric acid 7.5 water 27.3 weight chromium potassium   65.2 at 60 -65 °C After immersing for 10-30 minutes , remove it with water, dry it or dry it. 80 ° C   The following drying; after washing or dry in the following solution: phosphoric acid 10 Water 20 butanol 3 This method is suitable for the phenolic - nylon, plastic, etc., a good effect.
[Method 3] Degreasing solution after the chemical treatment of: ammonium hydrogen phosphate 20-26 2-2.5 3-3.5 chromium boron concentrated sulfuric acid 0.4-0.6 Water 50-60 25 1000 -40 °C Dipping for 4.5-6 minutes , that is, washing with water and drying. The method has high bonding strength and is glued within 4 hours after treatment, and is suitable for epoxy glue and epoxy - butyronitrile glue.
[ Method 4] Chemical treatment in the following solution after degreasing: phosphoric acid   7.5 chromium oxide 7.5 alcohol 5.0 formaldehyde ( 36-38% ) 80 at 15 -30 °C Dip for 10-15min , then at 60 -80 °C Wash and dry under water.
[ Method 5] After degreasing, anodizing is carried out in the following solution: concentrated sulfuric acid 22g /l at 1 -1.5A /dm2 is immersed for 10-15 min under DC intensity, and then in saturated potassium dichromate solution at 95 -100 °C Dip for 5-20 min , then wash with water and dry.
[ Method 6] After degreasing, chemical treatment was carried out in the following solution: potassium dichromate 66 sulfuric acid ( 96% ) 666 water   1000 at 70 ° C   Immerse for 10 min , then wash with water and dry.
[ Method 7] After degreasing, chemical treatment was carried out in the following solution: nitric acid ( d=1.41 ) 3 hydrofluoric acid ( 42% ) 1 20 ° C   Immerse for 3s , which is washed with cold water, and then 65 ° C   Wash with hot water, rinse with distilled water, and dry. This method is suitable for high copper-containing aluminum alloy casting.
[ Method 8] After blasting or sanding, anodizing in the following solution: chromium oxide 100 sulfuric acid 0.2 sodium chloride 0.2 at 40 ° C   The voltage is raised from 0 V to 10 V in 10 min for 20 min , then from 10 V to 50 V in 5 min , held for 5 min , then washed with water. 700C   Dry down. Note: The free chromium oxide concentration should not exceed 30 -35g /l .
[ Method 9] Chemical treatment in the following solution after degreasing: sodium silicate   10 non-ionic detergent 0.1 in 65 ° C   Immerse for 5 min , then at 65 ° C   The following water was washed, and then washed with distilled water and dried. Suitable for bonding aluminum foil.
[ Method 10] After degreasing, chemical treatment was carried out in the following solution: sodium fluoride 1 concentrated nitric acid 15 water 84 was immersed at room temperature for 1 min , washed with water and then treated in the following solution: concentrated sulfuric acid 30 dichromate 7.5 water 62.5 at room temperature Dip for 1 min , wash with water and dry.

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