1 silver and silver electrophoretic material oxidation:
Shelf - Washing - Cryogenic Polishing - Washing - Washing - Clamping - Oxidation - Washing - Washing - Washing - Sealing - Washing - Washing - Down - Drying - Inspection
Enter the electrophoresis process
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2 grinding material and frosted electrophoretic material oxidation:
Shelf - Degreasing - Washing - Etching - Washing - Washing - Alkali etching - Washing - Washing - Neutralizing light - Washing - Washing - Clamping - Oxidation - Washing - - Washing - Washing - Sealing - Washing - Washing - Off - Drying - Inspection - Packaging
Enter the electrophoresis process
3 coloring material and coloring electrophoretic material oxidation
Shelf - Washing - Cryogenic Polishing - Washing - Washing - Clamping - Oxidation - Washing - Washing - Washing - Coloring - Washing - Washing - Sealing - Washing - Washing
Inspection into the electrophoresis process
- Off - Air Drying - Inspection - Packaging
Second, the material:
1 Before loading the material, the contact surface of the suspender should be polished and fed according to the standard count. The calculation formula is: the number of feeds = standard current, standard current density, and single-strand area
2 The principle of consideration for the number of shelves:
a, silicon machine capacity utilization is not greater than 95%;
b, current density 1.0-1.2A/dm;
c. The necessary clearance between the profile shape and the two profiles;
3 oxidation time calculation: oxidation time (t) = film thickness K. current density K is the electrolytic constant, take 0.26-0.32, t units for minutes;
4 The upper row must be in accordance with the number of counts specified in the "Area Area and Upper Row Count Table";
5 In order to facilitate drainage and exhaust, the upper row should be tilted with an inclination of 5°;
6 Both ends can exceed the conductive rod 10-20mm, more should not exceed 50mm.
Third, low temperature polishing process
1 low-temperature polishing bath in the low temperature polishing agent concentration is controlled to 25-30g/l total acid, lower ≥ 15g/l;
2 Polishing tank temperature 20-30 °C not lower than 20 °C, polishing time 90-200s;
3 Tilting the rack, dropping the residual liquid, quickly put it in a clear water tank, rinsing into the oxidation tank after two washings, and stay in the water tank for no more than 3 minutes;
4 The cryogenic polishing material must not be processed in other ways before polishing, nor can other fluids be brought into the polishing bath.
Fourth, degreasing process;
1 in room temperature acid, time 2-4 minutes, H2SO4 concentration 140-160 g / l;
2 Tilt the rinsing residue and put it in a clear water tank for 1-2 minutes.
Five, scrub (etching) process
1 After deoiling, clean the tank and then enter the etching tank;
2 Process parameters: NH4HF4 concentration 30-35 g/l, temperature 35-40 °C, PH value 2.8-3.2, etching time 3-5 minutes;
3 After the etching is completed, two washings are performed to enter the alkali etching tank.
Six, alkaline cleaning process
1Process parameters: free NaOH 30-45 g/l, total alkali 50-60 g/l, alkaline 5-10 g/l, AL3+ 0-15 g/l, temperature 35-45°C, sand alkali etching 30-60 seconds
2 Tilting the rack, dropping the solution and quickly placing it in a clear water tank to clean it;
3 Check the quality of the cleaned surface. When there is no corrosion marking, no foreign matter, and no condensation on the surface, you can enter the light extraction process.
Seventh, light process
1Process parameters: H2SO4 concentration 160-220 g/l, HNO3 amount or 50 g/l -100 g/l, temperature room temperature, light time 2-4 minutes;
2 Tilt the rinsing liquid into the clear water tank and put it into the clean water tank for 1-2 minutes, then put it into the second clean water tank for 1-2 minutes;
3 After the two cleanings are completed, the aluminum wire on the bracket shall be clamped to ensure good contact in the oxidation process. Ordinary material pliers tie one end of the aluminum wire, coloring material, electrophoretic material should clamp the two ends of the aluminum frame.
Eight, oxidation process
1 Process parameters: H2SO4 concentration 160-175 g/l, AL3+ ≤ 20 g/l, current density 1-1.5A/dm, voltage 12-16V, oxidation tank temperature 18-22°C, and the energization time calculated according to the calculation formula. Oxide film regulations: silver material 3-4μm, white sand 4-5μm, electrophoresis 7-9μm;
2 The anode rack should be placed into the conductive seat smoothly, and check and confirm that the profile and the cathode plate are not in contact with each other and can be electrified and oxidized;
3 End of Oxidation Lift the anode rod off the liquid surface and rinsing residue. Transfer to clean water tank for 2 minutes.
4 pairs of uncolored profiles can enter the secondary sink to be sealed.
Nine, coloring process
1Process parameters: SnSO4 5-6g/l; NiSO4 16-18g/l; Colorant 9-12g/l; Free acid 17-20g/l; PH value = 0.8-1.2, bath temperature 19-21°C The coloring voltage should be lower than the oxidation voltage, that is 14-16V; usually added in the following ratio: SnSO4: NiSO4 = 1:1; coloring additive: SnSO4 = 1:1
2 The coloring products can only be used in a single-row double-lined arrangement. The spacing between products ≥ the width of the corresponding surface of two adjacent products. Generally when the finger is used to measure ≥ two finger widths, the tie-bar must be tightly fastened and firmly attached. New lines can be used;
3 When the coloring products are oxidized, the temperature of the oxidation tank must be controlled at 18-22 °C to ensure that the film thickness is uniform and the structure is fine;
4 The colored area of ​​oxidation of each row of coloring products should be basically the same;
5 After the coloring, the lifting frame is tilted and compared with the swatches. After the conditions are met, re-entry into the clearing tank for cleaning. Otherwise, the following conditions will be taken care of;
a, light color, re-enter the coloring tank, according to color switch coloring, the time shall not exceed 2 minutes;
Dark color, should be placed in the corresponding tank in the oxidation tank fade, or air suspension fade to the ideal so far;
b. After the oxidation, the product must be washed with three or more waters before entering the coloring tank to ensure that the pH of the washing tank is greater than or equal to 5;
7 Coloring products should not be soaked in the sink for a long time after being oxidized. Generally, the soaking time should not exceed 3 minutes.
8 After the product enters the coloring tank, it should not be electrified, soaked for about 1 minute, and then begin to energize the coloring. After the coloring process begins, the coloring voltage will be raised to 14-18 V in about 30s, and then the voltage will remain stable until the coloring. complete;
9 Try to avoid coloring of different products and batches of products on the same shelf as much as possible;
10 After the coloring is completed, the post-treatment can be performed after the secondary washing, and the pH of the washed water is controlled. The value is PH ≥ 2 in the front lane and the second lane is ≥ 5.
Ten, sealing process
1 Put the oxidation profile into the sealing pore pool so that the porous membrane layer can be closed to increase the oxide film corrosion ability;
2Technical parameters: Ordinary sealing pore temperature: 10-30°C Time 3-10 minutes, PH5.5-6.5, sealing agent 5-8 g/l, nickel ion 0.8-1.3g/l, fluoride ion 0.35-0.8g /l;
3 After the sealing is completed, lift the row and tilt it. After the plugging liquid is dripped, transfer it to the clean water tank and clean it twice, one minute at a time. Then dry the sections and remove them for air-drying inspection and packaging.