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1,200 Tons/Month Hard Anodizing Production Line for Aircraft Landing Gear Components with MIL-A-8625 Type III Specification

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1,200 Tons/Month Hard Anodizing Production Line for Aircraft Landing Gear Components with MIL-A-8625 Type III Specification

Brand Name:	MEI-AL
Model Number:	MEI-AL-L20261003
MOQ:	I set
Price:	Customized Price
Packaging Details:	Standard Packaging
Payment Terms:	L/C,T/T

Detail Information

Product Description

Detail Information

Place of Origin:

Foshan, China

Document:

PDF Gallery_20240719_102320...20.pdf

Production Capacity:

Varies By Model, Typically 100-2000 T/M

Water Presssure:

Customer Local Water Pressure

Product Name:

Anodizing Production Line

Environmental Protection:

Compliant With Environmental Regulations

Profile:

Aerospace, Military, Medical Device Components...

Line Length:

Depends On Configuration, Usually 10-30 Meters

Operate:

Semi-automatic Or Automatic

Process Style:

Hardcoat Anodizing

Highlight:

1200 Tons/Month Hard Anodizing Production Line

MIL-A-8625 Type III Hard Anodizing Production Line

Aircraft Landing Gear Components Anodizing Production Line

Product Description

1,200 Tons/Month Turnkey Hard Anodizing Production Line for Aircraft Landing Gear Components (MIL-A-8625 Type III)

Overview

This turnkey hard anodizing production line is engineered for aircraft landing gear component manufacturers, where coating performance requirements represent the most demanding standards in surface treatment. The complete system covers the entire process chain—from pre-treatment through hard anodizing to sealing—within a PLC-controlled automated framework.

Hard anodizing (Type III) operates at lower electrolyte temperatures and higher current densities than conventional sulfuric acid anodizing, producing denser, less porous oxide coatings with superior wear resistance and corrosion protection. This process is specified for aerospace applications requiring extremely hard, thick abrasion-resistant coatings, particularly aircraft landing gear struts and related components. The system strictly follows MIL-A-8625 Type III specifications, defining nominal coating thickness of 0.002 inches (approximately 50.8 µm) unless otherwise specified.

The 1,200 tons/month capacity configuration supports batch production of landing gear components and other high-reliability aerospace parts. Process parameters are fully adjustable based on alloy composition, component geometry, and target coating properties. Environmental compliance is integrated into the design, featuring closed-loop rinse water recycling and exhaust gas scrubbing systems.

Technical Specifications

Parameter	Specification
Applicable Workpieces	Aircraft landing gear struts, actuators, pistons, cylinders, and structural components (aluminum alloys including 7075, 2024, 6061)
Operation Mode	Fully automatic PLC-controlled with recipe management and manual override
Anodizing Type	Type III Hard Anodizing (sulfuric acid electrolyte, MIL-A-8625F)
Film Thickness	Nominal 0.002 in (50.8 µm) per MIL-A-8625F; range 0.0005–0.0045 in (12.7–114 µm); thickness tolerance ±20% for coatings up to 0.002 in, ±0.0004 in for coatings over 0.002 in
Surface Finish	Natural dark gray industrial finish; low porosity with 50% penetration and 50% growth (approximately)
Process Temperature	Electrolyte temperature 0°C to −4°C (32°F typical); sealing: up to 95°C
Current Density	2.0–3.3 A/dm² (adjustable by alloy and part geometry)
Production Capacity	1,200 tons/month (dependent on surface area per ton and cycle time)
Sealing Method	Hot deionized water sealing / Nickel acetate sealing (configurable)

Note: Process parameters are adjustable within these ranges based on specific alloy composition, workpiece geometry, and target coating properties. Actual throughput depends on part size, racking density, and required film thickness. Detailed specifications are available upon request.

Reference Performance Data (per MIL-A-8625F Type III)

Property	Requirement / Typical Range	Source
Corrosion Resistance (Salt Spray)	1,000–2,000 hrs	Pioneer Metal Finishing, MIL-A-8625 data
Wear Index (Cu ≥ 2% alloys)	≤ 3.5 mg/1000 cycles	MIL-A-8625F
Wear Index (other alloys)	≤ 1.5 mg/1000 cycles	MIL-A-8625F
Minimum Coating Weight	4,320 mg/ft² per 0.001 in coating	MIL-A-8625F
Coating Thickness Range	0.0005–0.0045 in (12.7–114 µm)	MIL-A-8625F
Salt Spray Resistance (Type III)	1,000–2,000 hrs (ASTM B117)	Industry technical data
Hardness	60–70 HRC (typical for hard anodized aluminum)	Industry data

Anodizing Process Flow

Loading → Chemical Degreasing → Rinsing → Alkaline Etching → Rinsing → Acid Neutralization (Desmutting) → Rinsing → Hard Anodizing (Type III) → Multi-stage DI Water Rinsing → Sealing → Hot Water Rinse → Drying → Unloading

Each stage is controlled by the central PLC system, with automated gantry crane transfer between tanks. Rinse stages incorporate cascading counter-flow to reduce water consumption. The hard anodizing stage uses a rectifier with stable DC output or pulse capability, and electrolyte temperature is maintained between 0°C and −4°C by an industrial chiller system. After coating formation, the film can be sealed to provide corrosion resistance; sealing is typically accomplished by treating the part in boiling deionized water or nickel acetate solution.

Key Features of the Hard Anodizing Line

Controlled Film Thickness

The rectifier and PLC system regulate current density and oxidation time to achieve target film thickness. Per MIL-A-8625F, Type III hard anodic coatings do not vary by more than ±20% for coatings up to 0.002 inches thick, and do not vary by more than ±0.0004 inches (0.4 mils) for coatings over 0.002 inches.

Automated Process Control

A central PLC system manages hoist movement schedules, immersion times, temperature profiles, and rectifier parameters with real-time data logging. The control system supports recipe management for different workpiece types and alloy combinations.

Batch Consistency

Automated electrolyte circulation, temperature control, and dosing systems maintain stable bath composition, contributing to consistent results across production runs. The electrolyte is monitored via conductivity and temperature sensors.

Temperature & Filtration Control

Hard anodizing requires lower electrolyte temperatures and higher voltages than conventional anodizing. The line incorporates industrial chillers with titanium heat exchangers and continuous multi-stage micron filtration for uniform coating formation.

Environmental Compliance Design

Anodizing is an environmentally favorable process that generates no hazardous waste under EPA rules. The line is designed with closed-loop rinse water recycling and exhaust gas scrubbing systems for acid mist control.

Production Line Configuration

A typical line layout includes the following major equipment:

Pre-treatment System: Degreasing tank, alkaline etching tank, acid neutralization tank, multi-stage rinsing tanks with cascade counter-flow
Hard Anodizing Tank System: Lead-lined or inert non-conductive tank with cathode system, electrolyte circulation interface, and uniform electric field design
Rectifier: High-power DC or pulse rectifier with stable output (current capacity matched to tank volume and workload)
Chiller System: Industrial chiller with titanium heat exchanger for electrolyte temperature control (0°C to −4°C)
Automated Gantry Crane System: Multi-unit hoist system for rack transfer between tanks
PLC Control Cabinet: Central control with touchscreen HMI, recipe management, and data logging
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, designed for aerospace environmental compliance
Rinse Water Recycling System: Closed-loop system with ion exchange or reverse osmosis for water reuse
Wastewater Treatment System: pH adjustment, sedimentation, and filtration for discharge compliance
Drying System: Hot air dryer or centrifugal dryer

The line footprint and tank dimensions are customized based on maximum workpiece size and required throughput. The tank is typically lead-lined, with the lead acting as the cathode to complete the electrical circuit; newer plants use inert non-conductive tanks with aluminum, stainless steel, or lead cathodes.

Frequently Asked Questions

Q1: What is the difference between Type II and Type III anodizing for landing gear applications?

Type III hard anodizing takes place at lower electrolyte bath temperatures and requires greater DC current than Type II anodizing. Under these conditions, a denser and less porous aluminum oxide coating is formed, which increases wear resistance and corrosion protection versus conventional anodize. For landing gear components, Type III is specified because the coating must withstand abrasion, hydraulic fluid exposure, and repeated mechanical loading.

Q2: What film thickness is required for aircraft landing gear components?

Per MIL-A-8625F, the nominal thickness of Type III hard anodic coatings is 0.002 inches (approximately 50.8 µm) unless otherwise specified on the drawing. Coatings over 0.002 inches do not vary by more than ±0.0004 inches in thickness. The specific thickness for each component is determined by the engineering drawing and the functional requirements of the application.

Q3: How is corrosion resistance verified for hard anodized landing gear components?

Hard anodized coatings are tested per ASTM B117 salt spray exposure. Industry data indicates Type III hard anodize provides 1,000–2,000 hours of salt spray resistance, compared to over 336 hours for Type II sulfuric anodize. The coating must also meet the wear index requirements of MIL-A-8625F: maximum 3.5 mg/1000 cycles for alloys with copper content of 2% or higher, and maximum 1.5 mg/1000 cycles for all other alloys.

Q4: What environmental regulations apply to anodizing for aerospace components?

Chromate-based sealing processes, historically used in aerospace anodizing, are subject to REACH authorisation requirements in the EU due to the intrinsic properties of hexavalent chromium compounds. The aerospace and defence sector has been developing and qualifying alternative solutions, and current REACH authorisations allow essential chromate uses to continue while substitution work progresses. Anodizing itself is an environmentally favorable process that generates no hazardous waste under EPA rules and meets ELV, RoHS, and WEEE directives. The line design accommodates both chromate-based and chromate-free sealing processes.

Q5: What is the typical lead time for line delivery and installation?

Lead time and installation schedule are confirmed based on project scope. Equipment manufacturing, shipment, installation, and commissioning proceed according to the project plan after design confirmation. (Actual timeline is subject to project scope confirmation.)

Q6: How is the 1,200 tons/month capacity calculated?

Capacity is calculated as: Monthly throughput = (Surface area per rack * Racks per hour * Operating hours) ÷ Average surface area per ton. Actual throughput depends on part geometry, racking density, and required film thickness. The 1,200-ton configuration is designed for batch production of landing gear components and related aerospace parts.

Customized Hard Anodizing Line Solution

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

To receive a tailored proposal, please share:

Workpiece drawings or samples (material, dimensions, surface area)
Target film thickness and performance requirements (including applicable MIL-A-8625 type and class)
Required monthly throughput (tons or pieces)
Available factory space and utilities (power, water, drainage)
Applicable environmental compliance requirements (REACH, local regulations)

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

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products details

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Aluminum Extrusion Press

Powder Coating Line

Aluminium Extrusion Handling System

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Aluminum Profile Wrapping Machine

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