ANODIZING / Aluminum, Clear, black, red, green, gold, purple, etc

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Anodizing

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Introduction

Anodizing protects metal by increasing the thickness of its surface oxide layer. When a coating less than 0.001" is produced, it is called standard or Type II anodizing. When coatings thicker than 0.001" are produced, it is called hardcoat or Type III anodizing.

Anodizing is often used to color parts, improve durability and enhance corrosion resistance. It also provides better adhesion of lubricants to raw metal and reduces galling of threaded components. Anodizing is typically applied to aluminum, but can also be applied to other metals including magnesium and titanium, and can be dyed to almost any color.

Material	Color	Applications	Subtypes
Aluminum	Clear, black, blue, gold, grey, red, etc.	Consumer goods, aircraft components, architectural parts, kitchenware	Type II, Type III

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Subtypes

Type II Anodizing

Material	Color	Applications	Thickness
Aluminum	Clear, black, blue, gold, grey, red, etc.	Consumer goods, aircraft components, architectural parts, kitchenware	1.8 μm to 25 μm (0.00007″)

Type III Anodizing

Material	Color	Applications	Thickness
Aluminum	Clear, black	Parts subject to high and low temperatures, chemical exposure, or wear	> 0.001″

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Design Recommendations

✔ Anodizing has insulative properties, so anodized parts have poor electrical conductivity.

✔ All edges and corners on the workpiece should be rounded with a radius of no less than 0.5 mm, and no burrs are allowed. This prevents local overheating and burning of the workpiece caused by current concentration.

✔ Workpieces with rough surfaces can become smoother after hard anodic oxidation treatment. However, workpieces already possessing an extremely smooth finish will lose some smoothness.

✔ In the process of hard anodizing, the workpiece must bear high voltage and current. Special fixtures must, therefore, be designed to keep the workpiece in good conductive contact. It will otherwise break down or burn the contact parts of the workpiece.

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ANODIZING / Aluminum, Colors: Clear, black, red, green, gold, purple, etc.