Skip to content

Benefits of Hard Coat Aluminum Anodizing

Hard coat aluminum anodizing, also known as Type III anodizing, is a process used to create a thick and highly durable oxide layer on the surface of aluminum and its alloys. This process enhances the corrosion resistance, abrasion resistance, and overall durability of aluminum while providing a decorative finish in some cases.


At Arrow, all of our Anodize dyes are able to produce 3 shades of the specific dyes color – a light, standard (to Arrow), and a dark shade. This is produced by the result of the process set-up as well as the alloy used. We keep sample parts or coupons of the end color on file to be used as reference on future orders.

We offer Black, Dark Grey, Grey, Dark Tan, Tan, Dark OD Green, OD Green.

Benefits of Hard Coat (Type III) Anodizing
  • Enhanced Wear Resistance: Hard coat anodizing produces an extremely hard and dense aluminum oxide layer on the surface. This hardness significantly improves the wear resistance of the treated aluminum parts. It is ideal for components exposed to abrasive environments or those subject to frequent friction or contact.
  • Corrosion Resistance: The thick and durable anodized layer provides excellent corrosion resistance. This makes hard coat anodizing an attractive choice for applications in marine environments, where aluminum components are exposed to saltwater, or in situations where protection against other corrosive agents is essential.
  • Electrical Insulation: The anodized layer has electrical insulating properties, making it valuable in electrical and electronic applications where electrical conductivity or isolation is required.
  • Dimensional Stability: Hard coat anodizing produces a controlled and uniform oxide layer, ensuring minimal dimensional change in the treated parts. This is crucial for applications where tight tolerances and precise measurements are critical.
  • Thermal Insulation: The anodized layer also offers some degree of thermal insulation. This property is advantageous in applications where temperature control or resistance to extreme temperatures is important.
  • Decorative Finish: While Type III anodizing is primarily known for its functional properties, it can also provide a decorative, matte finish. The anodized layer can be dyed in various colors, offering aesthetic possibilities alongside its protective qualities.
  • Low Maintenance: Anodized surfaces are relatively low maintenance. They are easy to clean and do not require frequent painting or coating to maintain their appearance and performance.
  • Longevity: The thick anodized layer is highly durable and long-lasting, extending the lifespan of aluminum components and reducing the need for replacements or repairs.
  • Environmental Benefits: Anodizing is a more environmentally friendly surface treatment compared to traditional plating processes, as it generates fewer hazardous waste byproducts.




Overall, the use of Type III anodizing, or hard coat anodizing, is common in industries where aluminum components need to withstand harsh environments, heavy use, and extreme conditions. Its combination of wear resistance, corrosion resistance, and dimensional stability makes it a valuable choice for applications in aerospace, military, automotive, architecture, and industrial settings, among others.





Learn More Contact Us

Stay Updated

Sign Up Now