Anodizing is one of the most common finishing options, offering strong corrosion protection and enhancing the overall appearance of metal parts. Three types of aluminum anodizing are available from Protolabs:
Type I-Chromic Acid: Provides a whisper-thin but still durable coating. Commonly used for welded parts and assemblies and as a primer before painting. Like all anodized surfaces, it is non-conductive.
Type II-Sulfuric Acid: Harder than Type I it offers an exceedingly durable finish. Usage examples include carabiner hooks, flashlight handles, motorcycle parts, and hydraulic valve bodies.
Type III-Hard Anodize or Hardcoat: This is the thickest and hardest anodize available and has a wide range of applications for parts and products in automotive, aerospace, heavy equipment, marine industry, general manufacturing, and military/law enforcement.
