Metal surface treatment before bonding (2)

Fourth, stainless steel surface treatment method

[method 1]
Degreasing common solvents: trichloroethylene, acetone, butanone, benzene, ethyl acetate.

[Method 2]
After sandblasting or emery cloth, it is greased.

[Method 3]
Immerse in the following solution at 70-85 °C for 10 min:
Sodium silicate 6.4 Sodium pyrophosphate 3.2 Sodium hydroxide 3.2 Detergent powder 1 Water 32
After washing with cold water, dry at 93°C.

[Method 4]
After degreased, immersed in the following solution for 10 minutes at a temperature of 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 and dip in the following solution at 65 °C for 3 min:
Chrome oxide 20 water 380
After washing and drying.

[Method 5]
Immerse in 65-70°C for 5-10min in the following solution:
Hydrochloric acid (37%) 2 Hexamethylenetetramine 5 Water 20
Then 30% hydrogen peroxide was added, and the water was taken out and dried at 93°C.

[Method 6]
Immerse in 50°C for 10min in the following solution:
Potassium dichromate saturated solution 0.35 Sulfuric acid (d=1.84 ) 10
Then the carbon residue was brushed off, washed with distilled water, and dried at 70°C. This method is suitable for applications where maximum peel strength is required.

[Method 7]
In lead-lined tank, the concentration of sulfuric acid is 500g/l, anodization is 90s, voltage is 6V, rinse with water, wash with distilled water, dry at 70°C, and the adhesive is an anode, after treatment, in a 5-10% chromium oxide solution Passivation for 20 minutes.

[Method 8]
Immerse in 85-90°C for 10min in the following solution:
Oxalic acid 37 Sulfuric acid (d=1.84) 36 Water 300
After washing with distilled water, dry it with warm air.

[Method 9]
After degreased, immersed in a solution at 65°C for 10 minutes:
Hydrochloric acid (d=1.19) 52 Hydrogen peroxide (30%) 2 Formaldehyde (38%) 10 Water 45
After washing with water, immersed in the following solution for 10 minutes at a temperature of 65°C:
Sulfuric acid (d=1.84) 100 sodium dichromate 10 water 30
After washing with distilled water, it was dried at 70°C.

[Method 10]
After washing with water-soluble industrial soap, 40°C hot water for 5 minutes, 120°C drying, then dipping in the following solution at 100°C for 2 minutes:
Hydrochloric acid 200 Phosphoric acid 30 Hydrofluoric acid 10
It was washed with hot water at 40°C for 5 minutes and dried at 40°C for 30 minutes.

Fifth, carbon steel and ferroalloy surface treatment methods

[method 1]
Degreasing commonly used solvents: trichloroethylene, acetone, ethyl acetate, gasoline, benzene, anhydrous ethanol.

[Method 2]
Sandblasting or emery cloth after grinding and degreasing.

[Method 3]
It was dipped in a 10% aqueous solution of water glass at 60°C for 10-15 minutes, then washed with water and dried.

[Method 4]
It was dipped in 18% aqueous hydrochloric acid at room temperature for 5-10 min, washed with cold water, washed with distilled water, and dried at 93° C. for 10 min.

[Method 5]
The mixture was treated with an equal amount of concentrated phosphoric acid and formaldehyde at 60C for 10 minutes, then washed with water and dried.

[Method 6]
After degreasing, immersing in 3.5% sodium hydroxide solution at 60°C for 20 minutes, rinsing with cold water, and then photochemicalizing in 5% nitric acid solution for 10 min, rinsing with cold water, and then immersing in the following solution:
Sodium dichromate 7.5 Sulfuric acid 24 Water 77
After being immersed for 20 minutes at 65°C, it was washed with 60°C hot water, washed with cold water, and dried at 70°C.

[Method 7]
Immerse in 71-77°C for 10min in the following solution:
Sodium dichromate 4 Sulfuric acid (d=1.84) 10 Water 30
After washing, distilled water, dried at 93 °C.

[Method 8]
Immerse in 60-65°C for 5min in the following solution:
Sodium Silicate 30 Sodium Alkyl Sulfonate 3 Water 967
After washing, hot distilled water was washed and dried at 100-105°C.

[Method 9]
Immerse in the following solution at 60 °C for 10 min:
Phosphoric acid (88%) 10 Ethanol 20
Carbon slag was washed away by running water, washed with distilled water, and dried at 120° C. for 30 minutes.

Six, titanium and titanium alloy surface treatment methods

[method 1]
Degreasing commonly used solvents: trichloroethylene, acetone, butanone, benzene, ethyl acetate, gasoline, anhydrous ethanol.

[Method 2]
After degreased, immersed in the following solution at 20 °C for 5-10 minutes:
Sodium fluoride 2 Chromium oxide 1 Sulfuric acid (d=1.84) 10 Water 50
After washing with water, wash with distilled water and dry at 93°C.

[Method 3]
Treat in the following solution at 20 °C for 2 minutes:
Hydrofluoric acid (conc.) 84 Hydrochloric acid (37%) 8.9 Phosphoric acid (85%) 4.3
Rinse with water, rinse with distilled water, and dry at 93°C.

[Method 4]
After degreasing, wash with a basic aqueous solution and then treat in the following solution at room temperature for 4-6 min:
Nitric acid (70%) 5 Ammonium fluoride 3 Water 92
After washing, treat in the following solution at room temperature for 2min:
Trisodium phosphate 5 Sodium fluoride 1 Hydrofluoric acid 1.5 Water 92.5
After washing and drying.

[Method 5]
After degreasing, scrub with the following solution for 2-3min:
Trisodium phosphate 5 Sodium fluoride 1.3 Hydrofluoric acid 2.9 Water 90.8
After washing, dry at 60°C.

Seven, zinc and zinc alloy surface treatment methods

[method 1]
Degreasing commonly used solvents: trichloroethylene, acetone, butanone, ethyl acetate, gasoline.

[Method 2]
After degreased, immersed in the following solution at room temperature for 2-4min:
Hydrochloric acid (37%) 10-20 Water 90-80
Wash with warm water, wash with distilled water, dry at 66-71 °C for 30 min.

[Method 3]
Immerse in 3-6min at 38°C in the following solution:
Sulfuric acid (d-1.84) 2 Sodium dichromate 1 Water 8
Rinse with cold water, wash with distilled water, and dry at 40°C.

Source: 21st Century Fine Chemicals Network