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Anodized Coating Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

Anodized coating is an electrochemical process that converts the aluminum surface into a durable, corrosion-resistant, anodic oxide finish. The aluminum substrate serves as the anode in an electrolytic cell, where controlled oxidation forms a porous aluminum oxide layer that can be sealed and optionally dyed for enhanced properties.

Working Principle

Electrolytic passivation process where aluminum acts as anode in acidic electrolyte (typically sulfuric acid), forming aluminum oxide (Al₂O₃) through controlled oxidation. Voltage application drives oxygen ions to combine with aluminum atoms, creating a hard, porous surface layer that can be sealed for corrosion resistance.

Materials

Aluminum alloy substrate (typically 6000 or 7000 series), Sulfuric acid electrolyte (15-20% concentration), Optional organic/inorganic dyes, Sealing agents (hot water, nickel acetate, or dichromate)

Technical Parameters

Hardness 200-600 HV
Wear Resistance Excellent
Coating Thickness 5-25 μm
Temperature Range -50°C to 200°C
Corrosion Resistance >500 hours salt spray (ASTM B117)
Electrical Insulation >500 V/μm

Standards

ISO 7599, ISO 10074, ASTM B580, MIL-A-8625, DIN 17611

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Anodized Coating.

Parent Products

This component is used in the following industrial products

Precision Aluminum Extrusion Profile

Custom-shaped aluminum profiles manufactured through extrusion processes

View Product Details

Engineering Analysis

Risks & Mitigation

Inadequate surface preparation leading to poor adhesion
Improper sealing causing reduced corrosion resistance
Electrical shorting if coating is too thin
Dimensional changes affecting tight tolerances
Environmental hazards from acid electrolytes

FMEA Triads

Trigger: Insufficient cleaning/degreasing
Failure: Poor coating adhesion and uneven appearance
Mitigation: Implement multi-stage cleaning process with alkaline cleaners and acid desmutting, conduct surface energy tests

Trigger: Incorrect current density or time
Failure: Inconsistent coating thickness and properties
Mitigation: Automated process control with real-time monitoring, regular calibration of power supplies

Trigger: Improper sealing temperature/time
Failure: Reduced corrosion resistance and dye retention
Mitigation: Temperature-controlled sealing baths, conductivity testing of sealed coatings

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±2 μm coating thickness, Ra 0.4-1.6 μm surface roughness

Test Method

Coating thickness: Eddy current or microscopic cross-section; Corrosion resistance: Salt spray testing per ASTM B117; Adhesion: Tape test per ASTM D3359; Hardness: Vickers microhardness test

Buyer Feedback

★★★★☆ 4.9 / 5.0 (32 reviews)

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Anodized Coating meets all ISO standards."

"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Anodized Coating arrived with full certification."

"Great transparency on the Anodized Coating components. Essential for our Machinery and Equipment Manufacturing supply chain."

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Frequently Asked Questions

What are the main advantages of anodized coating for aluminum extrusions?

Enhanced corrosion resistance, improved wear resistance, electrical insulation, better adhesion for paints/coatings, aesthetic customization through dyeing, and dimensional stability with minimal thickness increase.

How does anodizing differ from painting or powder coating?

Anodizing chemically converts the surface rather than applying a separate layer, resulting in superior adhesion, harder surface, better heat dissipation, and no risk of peeling or chipping like organic coatings.

What factors affect anodized coating quality?

Aluminum alloy composition, surface preparation (cleaning/etching), electrolyte concentration and temperature, current density, processing time, and proper sealing method all significantly impact final coating properties.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Anodized Coating