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Aluminum Surface Treatment

Sulfuric Anodize Oxalic Acid AnodizeHard Anodize
 Treatment
 Overview

Processes in sulfate bath
The most common treatment

It can be processed at higher temperatures than sulfuric acid bath. Voltage is high Processed in low temperature electrolytic bath, to produce a thick, hard film.
 Main objective
 Characteristics


Rust prevention , decorative (colored)
• Film thickness: 5 ~ 20μm
• Color: colorless to gray

Rust, abrasion resistance and insulation
• Film Thickness:5~40μm


Abrasion resistance, Corrosion resistance and insulation
• Film Thickness:30~60μm
• Color: Gray ~ Brown
 Main
 Applications

Construction materials,
industrial goods, household goods, ornaments
Equipment, semiconductor


Sliding parts including shafts and rollers, and aircraft parts

 Efficiency


Easy low-cost wastewater treatment solution

Expensive Fluids
High power costs
High waste water treatment costs
High power costs
High utility costs

 Transparency

Transparency film (Alloy colorization)

Yellow Coating

Film varies according to materials, but becomes generally black
 Stain
 Resistance
 Color
 Anodizing
Transparency and better dye absorption Primary coating of electrolytic coloring

Stainability is poor



Stainability is poor



 Corrosion
 Resistance
Superior

Superior

Superior

 Abrasion
 Resistance

Hardness
200~250Hv

Hardness
300~350Hv

Hardness
400~450Hv
Good abrasion resistance
 Coating
 Thickness
 Speed
12~15μm/40 min.


9~10μm/40 min.


32~80μm/40 min.


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