Type I is known as Chromic Acid Anodizing. It offers an exceptional thin corrosion resistant coating that ranges in thickness from 0.00005” to 0.0002”. This process is less corrosive than Type II and therefore making it safer to use on critical components where acid could perhaps become lodged in a seam or weld that could then compromise the integrity of the finished product. Chromic Acid Anodize appears much grayer in color and being a thinner coating absorbs less dye. This limits the Chromic Anodize as a decorative finish.
Here are some benefits of Type I:
- Doesn't conduct electricity
- Improved adhesion
- No dimensional change
- Can be dyed black
- Paint base
This is the go to for many components that are used in the aerospace industry, precision machining or parts that undergo a lot of flexing. It also provides for higher fatigue resistance over other anodizing processes. In contrast though it can tend to be softer and less porous than Type II and Type III.