What is Type 3 anodize?
What is Type 3 anodize?
Coating Description Type III aluminum anodizing, also called hard coat anodizing or hard anodizing, is used to increase the wear and corrosion resistance, increase the surface hardness, and improve the thermal and dialectical properties of treated aluminum objects.
What color is hard anodized aluminum?
Hard Coat Color Anodizing Services On some alloys, the color of non-dyed (MIL-A-8625 Type III Class I) aluminum after hard anodizing will change to a gray/bronze color; on others, the aluminum will turn gray-black. If the aluminum is dyed (Class II), black is the most commonly used color.
What is mil-a-8625?
Military specification MIL-A-8625 is the model spec for many components that need anodized for the military and/or aerospace industry. The specification covers all the requirements needed for six types and two classes of electrolytically formed anodic coatings on aluminum and aluminum alloys.
How do you anodize aluminum Type 3?
Type III anodizing is performed in a sulfuric acid bath containing 180-200 grams per Liter of acid and a small amount of dissolved aluminum. The operating temperature is controlled between 28-32ยบ F but in some instances an acceptable oxide can be achieved at slightly higher temperatures.
Does anodizing harden aluminum?
Hard anodizing produces a hard wear and an abrasion-resistant coating of aluminum oxide on the surface of aluminum alloys. The purpose of hard anodizing of aluminum is to increase hardness and wear resistance of the part.
What is MIL-A-8625 Type II?
Class II is an anodic coating used for more unimposing commercial applications. Mil-A-8625 is much more simple; class I refers to non-dyed coatings, and class II means the coating is dyed / colored after anodizing and before sealing.
How much does anodizing add to thickness?
The anodizing process makes the oxidized surface much thicker, up to several thousandths of an inch thick. The hardness of the anodized aluminum oxide coating rivals that of a diamond, enhancing the abrasion resistance of the aluminum.
