The description “BLACK ANODIZE PER MIL-A-8625, TYPE II, CLASS 2 WITH 2-STEP ELECTROLYTIC INORGANIC COLORING” refers to a specific type of surface treatment and coloring process for aluminum and its alloys, as per the MIL-A-8625 military specification. Let’s break down the components of this description:
1. Black Anodize: Anodizing is an electrochemical process that forms a durable oxide layer on the surface of aluminum and its alloys. This oxide layer enhances corrosion resistance and can also be used as a base for coloring. In the context of your description, “Black Anodize” refers to the process of creating a black-colored anodized layer on the aluminum substrate.
2. MIL-A-8625: This refers to the military specification that outlines the requirements for anodizing aluminum and its alloys. MIL-A-8625 defines various types of anodizing processes, including Type II.
3. Type II Anodizing: In MIL-A-8625, Type II refers to a specific type of anodizing known as “Sulfuric Acid Anodizing.” This process involves using sulfuric acid electrolyte to create an anodized layer on the aluminum surface. It generally results in a clear or natural color appearance, but in this case, it’s combined with coloring to achieve a black color.
Class 2 Anodizing: Within Type II anodizing, there are different classes that specify the thickness of the anodized coating. Class 2 refers to a relatively thicker anodized coating, which provides enhanced corrosion protection.
4. 2-Step Electrolytic Inorganic Coloring: This refers to the coloring process that follows the anodizing step. In this case, it’s a two-step process. Electrolytic coloring involves immersing the anodized aluminum in an electrolyte solution containing metal salts. When an electric current is applied, the metal salts are deposited within the porous anodized layer, resulting in coloration. Inorganic coloring is used for its durability and resistance to fading.
5. Combining these elements, the description “BLACK ANODIZE PER MIL-A-8625, TYPE II, CLASS 2 WITH 2-STEP ELECTROLYTIC INORGANIC COLORING” outlines a specific process for creating a black-colored anodized aluminum surface with enhanced corrosion resistance and a durable, long-lasting color finish. This type of treatment is commonly used in aerospace, automotive, and other industries where both aesthetics and performance are crucial.
