⚙️ Anodizing: Durable Beauty Through Electrochemical Precision

🧩 What Is Anodizing?

Anodizing is an electrochemical process that enhances metal surfaces by forming a controlled oxide layer. It improves corrosion resistance, wear durability, and visual appeal—especially for aluminum components.

🔁 Process Workflow

• Surface Preparation – cleaning and degreasing
• Etching & Brightening – optional polishing or texturing
• Anodizing Bath – acid electrolyte immersion
• Electrochemical Reaction – oxide layer formation
• Coloring – dyeing the porous layer (optional)
• Sealing – hot water or nickel acetate treatment

🧪 Common Types of Anodizing

Type	Description	Oxide Thickness
Type I (Chromic Acid)	Thin, soft layer for aerospace	~0.5–2.5 μm
Type II (Sulfuric Acid)	Standard decorative finish	~5–25 μm
Type III (Hard Anodizing)	Thick, wear-resistant layer	~25–150 μm

🎨 Color & Finish Options

• Natural silver
• Black
• Bronze
• Blue, red, gold
• Champagne and custom hues

🎯 Application Areas

• ✈️ Aerospace – housings, brackets
• 🚗 Automotive – trim, wheels
• 🏢 Architecture – panels, frames
• 📱 Electronics – casings, heat sinks
• 🩺 Medical – surgical tools

💡 Technical Features

• Corrosion and wear resistance
• UV-stable color finishes
• Electrical insulation
• Eco-friendly process

🔍 Pros vs. Cons

Advantages	Limitations
Durable oxide layer	Limited to non-ferrous metals
Vibrant, fade-resistant colors	Requires precise control
Lightweight protection	Not ideal for steel
Excellent paint adhesion	Color depends on alloy

🛠️ Compatible Materials

Suitable: Aluminum, titanium, magnesium, zinc

Not Recommended: Carbon steel, stainless steel (unless pre-treated), plastics

🔗 Related Surface Treatments

Process	Comparison to Anodizing
Electroplating	Metal layer added; better conductivity
Powder Coating	Thicker, flexible finish
Passivation	Chemical protection for stainless steel
Electroless Plating	Uniform metal layer on non-conductive surfaces

💬 SOMI’s Surface Engineering Vision

At SOMI, anodizing is more than protection—it’s precision with personality. We offer custom color-matched finishes, hybrid treatments, and aerospace-grade durability for components that perform and impress.