520 Tons/Month Capacity Sulfuric Acid Anodizing Production Line with PLC-Controlled Automated System for 10-25 μm Film Thickness

This turnkey sulfuric acid anodizing production line is engineered for manufacturers of aluminum cosmetic bottle caps, closures, and packaging components. The complete system covers the entire process chain—from pre-treatment through Type II anodizing, dyeing, and sealing—within a PLC-controlled automated environment.

Type II sulfuric acid anodizing (per MIL-A-8625) creates a porous oxide layer on aluminum that readily accepts organic dyes, making it ideal for both decorative and functional finishes on cosmetic packaging. For cosmetic applications, the anodized layer typically ranges from 10 to 25 microns thick, providing excellent corrosion resistance while ensuring uniform dye absorption for consistent coloration.

The production line follows a sequential multi-stage process:

• Loading → Chemical Degreasing → Rinsing → Alkaline Etching → Rinsing → Neutralization (Desmutting)
• Rinsing → Sulfuric Acid Anodizing (Type II) → Multi-stage DI Water Rinsing → Dyeing/Coloring
• Sealing → Final Rinsing → Drying → Unloading

Each stage is controlled by the central PLC system with automated transfer between tanks. Rinse stages incorporate cascading counter-flow technology to minimize water consumption. The anodizing stage utilizes a rectifier with stable DC output, while electrolyte temperature is maintained within ±2°C by an industrial chiller system.

After anodizing, the porous oxide layer is immersed in a dye bath (organic or inorganic dyes) to achieve the target color. Sealing closes the micropores of the oxide film, locking in the dye and enhancing corrosion resistance. Hot deionized water sealing is environmentally benign, as it involves no toxic chemicals.

A typical line layout includes the following major equipment:

• Pre-treatment System: Degreasing tank, alkaline etching tank, neutralization tank, multi-stage rinsing tanks with cascade counter-flow
• Anodizing Tank System: Corrosion-resistant PP/PVC tank with lead or stainless steel cathode system, electrolyte circulation interface
• Rectifier: High-power DC rectifier with stable current output
• Chiller System: Industrial chiller with titanium or stainless steel heat exchanger
• Automated Transfer System: Gantry crane or rail-mounted hoist system for rack transfer
• PLC Control Cabinet: Central control with touchscreen HMI, recipe management, and data logging
• Dyeing System: Organic dye tank or electrolytic coloring tank with temperature control
• Sealing System: Hot deionized water or nickel acetate sealing tank with temperature control
• Filtration System: Continuous multi-stage micron filtration for electrolyte clarity
• Exhaust & Scrubber System: PP or FRP fume hoods with acid mist scrubber
• Wastewater Treatment System: pH adjustment, sedimentation, and filtration for discharge compliance
• Drying System: Hot air dryer or centrifugal dryer

Line footprint and tank dimensions are customized based on maximum component size and required throughput.

Every production scenario differs in component geometry, alloy mix, and throughput target. We provide customized line layouts and process solutions based on your specific requirements—including tank sizing, transfer system configuration, rectifier capacity, chiller selection, and treatment cycle design.

To receive a tailored proposal, please share:

• Component drawings or samples (material, dimensions, surface area per ton)
• Target film thickness and color requirements
• Required monthly throughput (tons)
• Available factory space and utilities (power, water, drainage)
• Applicable environmental compliance requirements

Our engineering team will respond with a proposed line layout, equipment list, and estimated process cycle time.