[China Aluminum Industry Network] 1. Topic content and scope of application:
This regulation specifies the technical requirements and specifications for the anodizing, coloring, and electrophoretic production of aluminum and aluminum alloys.
2, process flow (route diagram)
Substrate loading degreasing alkaline etching and anodized electrolytic coloring sealing electrophoretic coating curing discharge packaging storage 3, loading and hanging:
3.1 Preparation before loading.
3.1.1 Check whether conductive parts such as conductive beams, conductive rods, etc. are fully conductive and regularly polished, cleaned or repaired.
3.1.2 Prepare conductive aluminum and aluminum wire.
3.1.3 Check whether the pneumatic tools and related equipment are normal.
3.1.4 Check whether the requirements for the type, length, count, color, film thickness, etc. of the circulation order or production order are in accordance with the order and the physical item.
3.1.5 According to the specification of profile (circumference size, external surface area, etc.), the number of supporters and the distance between them shall be determined. The distance between the pigments shall be controlled at about 1.2 times the horizontal width of the profile, and the distance between white materials shall be controlled at about 1 times the width of the profile.
3.1.6 Select suitable racks to ensure that the number of hooks of the front and rear hangers is the same as the number of hooks of the profiles.
3.2 Hanging:
3.2.1 When hanging, first hang the upper one, then the lower one, and then evenly arrange the remaining sections in the middle and tighten all the aluminum screws.
3.2.2 Aluminium plates shall be sandwiched between the profiles and the aluminum screws prior to attachment to prevent the electrical conductivity between the profiles and the hangers from affecting oxidation, coloration or electrophoresis.
3.2.3 When loading and hanging, it is forbidden to install all the profiles in the lower or upper part of the rack.
3.2.4 Mounted profiles must maintain a certain degree of inclination (>5°) to facilitate electrophoresis or exhaust during coloration, reducing speckle (bubbles).
3.2.5 When mounting, the direction of the profiled decorative surface and groove must be taken into account to prevent chromatic aberration, bubbles, and pitting on the decorative surface.
3.2.6 Long bends and deformed long sections shall be added to the middle section of the section, or a hanging wire shall be used to prevent the sections from rubbing or touching the inner plates of the grooves. The surfaces of the sections may be scratched or burned.
3.2.7 When selecting the vice bar hangers, the insert bar is preferred. When aluminum bars are used for binding, they must be evenly spaced and the outcrop should be less than 25 mm.
3.2.8 Sections with large cross-sections and shapes must not be mounted on the same row.
3.2.9 For hanging or carrying profiles, clean gloves must be worn, gently handled, protected, and protected against the surface of the profiles. Barbaric operation is strictly prohibited.
3.2.10 Self-inspection and mutual inspection must be strengthened when loading or carrying profiles. Unqualified profiles are not allowed to be attached. Profiles with oil stains or aluminum chips (burrs) on the surface must be handled with appropriate measures.
3.2.11 After rejecting unqualified profiles, they must make up the order according to the number of orders.
3.2.12 The profile of the loading area should not be stored for too long to prevent exhaust gas from corroding the profile surface.
3.2.13 Conscientiously fill out the records of the loading and affixing section of the “Loading & Hanging Record†and the “Oxidation Process Flow Cardâ€, accurately calculate and fill in each oxidized area, and check the order at any time to ensure that the model, number and color are not in error.
3.2.14 Conscientiously do the handover procedures and environmental sanitation in the work area.
4. Preparation of oxidation station before production:
4.1 Check the liquid level of each process tank, adjust the concentration of each tank according to the laboratory report, ensure that the tank fluid always meets the process requirements, and often remove the dirt in the tank fluid.
4.2 Check whether the equipment such as driving, freezer, rectifier, circulating acid pump, water pump, transfer vehicle, curing oven, etc. are normal.
4.3 Check the PH (or conductivity) and cleanliness of the pure water wash tank and the tap water tank, and if it does not meet the process requirements, replace it promptly or make up for overflow.
4.4 Open the alkaline or hot pure water tank, steam or cooling water in the sealing groove, open the circulation cooling system of the oxidation tank, the coloring tank, and the electrophoresis tank to ensure that the tank fluid is uniform and the temperature reaches the technological requirements.
4.5 Check the Roots blower, extraction and exhaust fans, and turn it on before production.
4.6 Carefully check the "Oxidation Process Flow Card" to clarify the production requirements and prepare color-matching swatches.
5, the general requirements for operation of oxidation table:
5.1 Each lifting should not exceed two hooks, and a certain distance must be maintained between the two hooks to prevent scratches between the profiles.
5.2 When the profile is hoisted in or pulled out of the bath, it must be tilted in and out, and the inclination should be controlled at about 30°.
5.3 Profiles dropped into the tank must be removed and attached to the row in a timely manner. Damage-discarded sections must be promptly notified to the loading and unloading team to make up for the order.
5.4 In addition to alkali etching and coloring, the profile should be drained after tanking to reduce waste and contamination.
5.5 When the transfer of the hanging material must cross other profiles, the level of the transfer profile must be maintained to reduce the flow of the liquid on the profile and contaminate the profile and the conductive beam.
5.6 Each process should promptly fill out the "Oxidation Process Flow Card" and sign it.
6, degreasing:
6.1 Process parameters Grout composition: Acid degreasing agent 2~3%
Bath temperature: degreasing at room temperature: 1~3min
6.2 Operational requirements:
6.2.1 check the process flow card, clear production requirements, the same color, the same model, the same order or similar specifications of the profile should be hoisted into the degreasing tank at the same time or priority, in order to facilitate the operation of the next process.
6.2.2 At the end of degreasing, the profile shall be hoisted out of the degreasing tank in time to prevent sanding of the profile surface.
6.2.3 After degreasing, the surface of the profile should be uniformly wetted and transferred to the alkaline etching process after being washed in two stages.
7, alkaline etching:
7.1 Process parameters:
Bath composition: flat light alkaline sand alkali etching NaOH: 40~50g/l45~60g/l
Additives (NaOH): 1/12~1/151/6~1/8
Bath fluid temperature: 40~45°C 45~55°C
Alkaline etching time: 1~3min10~30min
7.2 Operational requirements:
7.2.1 When the alkali is etched, open the air exhaust fan.
7.2.2 At the end of the alkali etching, the profile shall be lifted as soon as possible. Immediately after the bath solution is drained, it shall be transferred to the sink for washing to prevent alkali corrosion marks or strays from forming on the surface of the profile.
7.2.3 Strictly control the alkaline etching process parameters to ensure that the surface quality after alkali etching is uniform.
7.2.4 After caustic etching, the profile must be washed with two overflows, moved up and down, and reversely inclined to thoroughly wash the lye in the surface of the profile and inner hole to prevent residual alkali from contaminating other baths.
8, in and:
8.1 Process parameters:
Bath composition: HNO3: 120~150g/l
Bath temperature: room temperature and time: 2~5min
8.2 Operational requirements:
8.2.1 During neutralization, the profile shall be moved counter-tilt up and down to fully neutralize the residual lye in the inner hole of the profile and remove the surface ash.
8.2.2 The profile after neutralization must be washed in two stages before entering the anodizing tank.
8.2.3 After the neutralization of the profile should strengthen the surface quality inspection, check the surface of the profile of the sand surface conditions, hanging ash, with or without burrs, spotted, weld lines and other surface defects, in order to deal with timely, rework.
8.2.4 Regularly check if the jig screws after neutralization are loose and if they are loose, they must be retightened to ensure good conductivity.
9. Anodizing:
9.1 Process parameters:
Bath composition: H2SO4: 150~180g/lAl ion: 5~15g/l
Bath temperature: 20±1oC
Oxidation voltage: 14~18V
Current density: 130~150A/?
Oxidation time: Calculated according to the film thickness requirement.
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