What is anodizing?
Anodizing is a method for changing the surface chemistry of metals and other substrates. It protects against corrosion, enhances aesthetic qualities, resists scratching and is one of the most durable surface finishes available.
While anodizing aluminum allows the metal to keep its natural appearance, the pores in the protective oxide layer also help to provide a better surface for the adhesion of paints and glues. While various metals, including titanium, hafnium, zinc, and magnesium, can be protected by applying an anodized layer, by far the process is most commonly applied to aluminum and aluminum alloys.
Types of Anodizing
Most anodizing on machined parts are of two commonly specified types: Type II (or "regular") sulfuric anodizing and Type III Hardcoat or "hard" sulfuric anodizing. The Type II & III designators come from the common Military specification, MIL-A-8625
Both Type II and Type III "hard" anodizing are very hard coatings. Type III "hard" anodizing is done at a lower temperature, is more expensive, and a little harder than Type II, but you need special equipment to tell the difference in practical terms. Type III, however, is much thicker than Type II, typically .002" vs. .0006" respectively, which makes it more resistant to scratching and heavy wear.
Common Dyed Anodizing
An anodizing layer may be dyed or undyed. In the 8625 Mil spec, the term "Class" is used to designate this: Class 1 is clear or undyed, and Class 2 is dyed.
Anodizing layer is commonly dyed with organic dyes by dipping the part into a hot dye tank directly after anodizing. A wide variety of colors can be obtained through this process. By far the most commonly specified color is black, followed by blues, reds and golds.
Note that only Type II anodizing can be dyed a variety of colors. Type III "hard" anodizing, which is quite dark even when undyed, is typically left clear or dyed black.
What anodizing service that Unison provide?
－Anodizing (Black, Blue, Red, Golden….)
－Clear Anodizing
－Clear Thick Anodizing
－Hard Anodizing
－Black Hard Anodizing
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