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After the aluminum machining process is completed, it turns into a very important surface finishing step for improving the quality lifespan and corrosion resistance of parts.
Applications:
For the electronics: more reliable oxide growth, to improve how electricity flows and add corrosion resistance. Decorative Architectural- reduces weather ability and rail roughness to enhance coating adhesion. Aerospace: Improve corrosion resistance and wear resistance, reduce surface reflectance.
By creating an oxide layer on the surface, anodizing is done as a result of electrochemical treatment that increases both hardness and wear resistance and also protects against corrosion.
3 methods of anodizing are used.
CLASS I (CHROMIC ACID ANODIZING) - known generally as chromic acid anodizing, it's the type typically specified for aluminum parts where corrosion protection and part paint adhesion are not required.
The Type II Acid Anodizing process uses sulfuric acid to produce thicker oxide coatings which are then sealed and dyed.
Type III: Often referred to as hard coat anodizing, this process creates a thicker layer for better corrosion protection and is typically utilized in severe environments.
Polyester - Good weather resistance and corrosion resistance, suit for outdoor products, less hardness
Polyurethane - With exceptional weather, abrasion, and chemical resistance characteristics that makes it suitable for indoor and outdoor use.
Acrylic - High gloss, toughness, and weather resistance for indoor furniture use and decorative elements.
Fluorocarbon - The top-quality paint this category is reserved for high-end architectural work and aerospace due to its ultimate weather and corrosion-resistant properties.
Silicone - Resists stains, ratio production, and weathering; common in building facades or on large equipment.
The process of Plating, which is a chemical passivation will provide aluminum even other good-looking quality before its physical shape:
Economic metal treatment: Passivation is a non-reactive surface that does not involve any corrosion of the base material, leaving it susceptible to attack by atmospheric exposure.
This scratch repair approach allows for the recovery of the oxygen molecular structure of the aluminum die-cast surface and makes it be good-looking again.
Improved stability: Offers more stable protection against corrosion than any traditional anti-corrosion measures.
New electrochemical polishing can in addition remove impurities on the polished aluminum surface and improve cleanliness and glossiness.
It is a good method to use for premium products such as smartphones, wristwatches, and ornaments or machined parts in the automotive industry & aerospace components.
