30–200 Tons/Month Automatic Anodizing Production Line with 8–12 μm Film Thickness for Type II Sulfuric Acid Anodizing

This automated anodizing line is engineered for high-precision finishing of aluminum mobile phone and laptop enclosures. Designed for thin-wall precision components, the system integrates mechanical/chemical polishing, Type II sulfuric acid anodizing, precision coloring, and mid-temperature or nickel-based sealing. It maintains consistent anodizing parameters across high-volume production, fulfilling strict dimensional tolerances, surface aesthetics, and environmental compliance requirements.

1. Pre-Treatment: Degreasing → Rinsing → Sandblasting (120#–320# Glass Beads) → Chemical/Mechanical Polishing → Rinsing → Desmutting
2. Anodizing: Type II Sulfuric Acid Anodizing Tank (8–12 μm film growth under DC current control) → Multi-Stage Cascade Rinsing
3. Coloring: Organic Dyeing / Electrolytic Coloring (Space Gray, Rose Gold, Midnight Black, Sierra Blue, Raw Titanium) → Pure Water Rinsing
4. Sealing: Mid-Temperature Sealing (70–85°C) or Nickel Salt + Hot Water Sealing → DI Water Rinsing
5. Post-Treatment: Drying → Quality Inspection → Packaging

• Controlled Film Thickness: The DC power supply system maintains voltage and current density within set limits, yielding an oxide layer between 8 μm and 12 μm to prevent dimensional tolerance issues on thin enclosure walls.
• Automated Process Control: Programmable Logic Controller (PLC) systems regulate gantry movement, immersion durations, and drip times, reducing manual handling variations and avoiding contact marks or surface damage.
• Batch Color Consistency: Closed-loop monitoring of dye bath pH, temperature, and concentration supports uniform color absorption across production lots, targeting color variance within △E< 0.5.
• Temperature & Filtration Control: Integrated chilling units and continuous circulation filtration keep the anodizing bath within 18–22°C and filter out particulates to prevent surface pitting.
• Flexible Surface Finishing: Line sequence adapts to different pre-treatment requirements, supporting glass bead blasting from 120# to 320# combined with chemical or mechanical polishing before anodizing.

• Automated Gantry Crane System: Programmable flight bars and hoist mechanisms for automated rack transfer across process tanks.
• PP / PVDF Process Tanks: Corrosion-resistant tanks fitted with air agitation pipes, chemical dosing ports, and inline liquid level sensors.
• Chilling & Heat Exchanger System: Industrial chillers paired with titanium heat exchangers for bath temperature regulation during the anodizing cycle.
• Exhaust & Fume Scrubber System: PP exhaust hoods, ducting, and vertical wet scrubbers for acid mist extraction and neutralization.
• Rectifier & Electrical Units: High-precision DC rectifiers with pulse/step control options tailored for thin-film anodizing.
• DI Water & Filtration Units: Continuous water purification setup paired with multi-stage liquid filtration units for dye and seal baths.