Anodized Coating: Temperature Range -50°C to 200°C

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

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

Parent Products

This component is used in the following industrial products

Precision Aluminum Extrusion Profile

Precision aluminum extrusion profiles are semi-finished structural components produced by forcing heated aluminum alloy through a shaped die.

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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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Anodized Coating

Manufacturer profiles associated with Anodized Coating.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Anodized Coating