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[ Method 2] Sand blasting or sanding cloth is roughened and then degreased.
[ Method 3] in the following solution at 25
[ Method 4] in the following solution at 60
[ Method 5] in the following solution at 25
[ Method 6] In the following solution 25
[ Method 7] After degreasing, it was etched in the following solution for 10 min , temperature 66
[ Method 8] Oxidation in the following solution: potassium persulfate 1.5 sodium hydroxide 5 water 100 at 60
[ Method 1] Common solvents for degreasing: trichloroethylene, acetone, methyl ethyl ketone, ethyl acetate. -30 °C Immersion for 1 min ; concentrated sulfuric acid 8 concentrated nitric acid  25 water  17 then washed, at 50 -60 °C Dry down. -70 °C Immersion for 10 min : concentrated sulfuric acid  40 4.5 Water 38 Iron sulfate is then washed with water, 60 -70 °C Dry down. -30 °C Under immersion for 10-15 min : concentrated sulfuric acid  10 Cr 5 weight aqueous sodium  85 then washed with water and dried at room temperature. -30 °C Immersion for 1-2 min: ferric chloride 15 concentrated nitric acid  30 water  200 was then washed with water and dried at room temperature. -71 °C : iron sulfate 4.5 concentrated sulfuric acid 3.4 water 450 then in 20 ° C Wash in cold water for 5 min , then dip in the following solution: sodium dichromate 5 concentrated sulfuric acid 10 water 85 and then washed in cold water, immersed in ammonium hydroxide ( d = 0.85 ) for 10 min , then washed with cold water for 5 min, distilled water Net, in 40 ° C Dry down. This method is used brass and bronze process. -70 °C After immersing for 15-20 minutes , the surface is black, and it is wiped once with carbon tetrachloride before bonding. This method is used for copper foil processing.