[Method 6]
After degreasing, immerse in the following boiling solution for 20 minutes:
Sodium dichromate 1.5 ammonium sulfate 3 ammonia (d=0.88) 0.3 水 93.7
Rinse with warm water, rinse with distilled water, and dry.
[Method 7]
Anodize in 10% ammonium hydride hydride solution below 30°C until the current density is lower than 0.45A/m2 (one electrode panel), AC voltage 90-120V
, Then wash and dry.
[Method 8]
Anodize in the following solution at 20-30°C:
Potassium hydroxide 12 aluminum 0.75 anhydrous potassium fluoride 3.4 sodium phosphate 3.4 potassium permanganate 1.5 water 80
AC voltage 85V, current density 1.1-1.4A/m2, then wash with cold distilled water and dry.
[Method 9]
After degreasing, wash in the following alkaline solution at 70°C for 5-15min:
Sodium hydroxide 23-34 water 400
Wash with cold water for 5 minutes, then immerse in the following solution for 5-15 minutes at a temperature of 55°C:
Chromium oxide 57-68 Calcium nitrate 5 Water 450
Wash with cold water for 2 minutes, then immerse in the following solution for 3-12 minutes at a temperature of 55°C:
Chromium oxide 45 Sodium phosphate 8 Water 450
Wash in cold water for 2 minutes, then dry at 40°C for 30 minutes.
3. Surface treatment methods of copper and copper alloys
[method 1]
Common solvents for degreasing: trichloroethylene, acetone, methyl ethyl ketone, ethyl acetate.
[Method 2]
Degreasing after sandblasting or sanding with emery cloth.
[Method 3]
Dip in the following solution at 25-30°C for 1 min;
Concentrated sulfuric acid 8 Concentrated nitric acid 25 水 17
Then wash with water and dry at 50-60°C.
[Method 4]
Immerse in the following solution at 60-70°C for 10 minutes:
Concentrated sulfuric acid 40 iron sulfate 4.5 水 38
Then wash with water and dry at 60-70°C.
[Method 5]
Soak in the following solution for 10-15min at 25-30°C:
Concentrated sulfuric acid 10 sodium dichromate 5 水 85
Then wash with water and dry at room temperature.
[Method 6]
Immerse in the following solution at 25-30°C for 1-2min:
Ferric chloride 15 concentrated nitric acid 30 water 200
Then wash with water and dry at room temperature.
[Method 7]
After degreasing, etch in the following solution for 10 minutes at a temperature of 66-71°C:
Iron sulfate 4.5 concentrated sulfuric acid 3.4 water 450
Then wash in cold water at 20°C for 5 minutes, and then soak in the following solution:
Sodium dichromate 5 concentrated sulfuric acid 10 水 85
Then wash in cold water, soak in ammonium hydroxide (d=0.85) for 10min, then wash with cold water for 5min
, Rinse with distilled water and dry at 40°C. This method is used for brass and bronze processing.
[Method 8]
Oxidize in the following solution:
Potassium persulfate 1.5 Sodium hydroxide 5 水 100
Immerse for 15-20min at 60-70°C, the surface will be black, wipe it with carbon tetrachloride before bonding. This method is used for copper foil processing.
Four, stainless steel surface treatment method
[method 1]
Common solvents for degreasing: trichloroethylene, acetone, methyl ethyl ketone, benzene, ethyl acetate.
[Method 2]
Degrease after sandblasting or sanding.
[Method 3]
Immerse in the following solution at 70-85°C for 10 minutes:
Sodium silicate 6.4 Sodium pyrophosphate 3.2 Sodium hydroxide 3.2 Descaling powder 1 水 32
After washing with cold water, dry at 93°C.
[Method 4]
After degreasing, immerse in the following solution for 10min, temperature 80°C, PH=12.65:
Sodium phosphate 8.5 sodium pyrophosphate 4.2 sodium hydroxide 4.2 surfactant 1.4 Water 380
Take out the water to wash, and then immerse in the following solution at 65°C for 3 minutes:
Chromium Oxide 20 水 380
Dry after washing with water.
[Method 5]
Immerse in the following solution at 65-70°C for 5-10 minutes:
Hydrochloric acid (37%) 2 hexamethylenetetramine 5 Water 20
Then add 30% hydrogen peroxide, take out the water to wash, and then dry at 93°C.
[Method 6]
Immerse in the following solution at 50°C for 10 minutes:
Potassium dichromate saturated liquid 0.35 sulfuric acid (d=1.84 ) 10
Then brush off the carbon residue, rinse with distilled water, and dry at 70°C. This method is suitable for occasions requiring maximum peel strength.