Finishing Options for CNC Machined Aluminum Parts
Anodizing is a popular finishing choice for CNC machined aluminum parts, providing excellent corrosion resistance and improving the overall appearance of metal components. Protolabs offers three different types of anodizing for aluminum:
- Type I – Chromic Acid Anodizing: This provides a thin but durable layer, commonly used for welded parts and assemblies or as a primer before painting. It is non-conductive, like all anodized finishes.
- Type II – Sulfuric Acid Anodizing: Offering a tougher and more resilient finish than Type I, it is ideal for applications like carabiner hooks, flashlight handles, motorcycle components, and hydraulic valve bodies.
- Type III – Hard Anodize or Hardcoat: The thickest and toughest anodizing option, commonly used in high-demand industries such as automotive, aerospace, heavy equipment, marine, general manufacturing, and military/law enforcement.
This provides clarity on the different anodizing options and their specific uses.