After CNC machining, aluminum materials easily form a natural oxide layer on the surface, which affects corrosion resistance, wear resistance, and appearance. Anodizing is the most commonly used and effective surface treatment process for precision aluminum alloy parts. It creates a dense aluminum oxide film that significantly enhances product performance. As a professional CNC aluminum parts manufacturer, we provide customers with a variety of mature anodizing solutions to meet the needs of industries such as aerospace, automotive, medical, and consumer electronics.
- Standard Sulfuric Acid Anodizing (Type II) This is the most common solution, with a film thickness of 5-25μm. It offers low cost and mature technology, providing excellent corrosion resistance and electrical insulation. Colors such as clear, black, red, gold, and others can be achieved through dyeing. It is ideal for CNC aluminum parts with high decorative and appearance requirements, such as electronic enclosures, brackets, and panels.
- Hard Anodizing (Type III) Also known as hard coat anodizing, it produces a thicker film of 25-150μm with hardness up to HV400-600 and extremely strong wear resistance. It is suitable for precision parts used in high-strength and high-friction environments, such as mechanical transmission components, automotive parts, and aerospace structural parts. After CNC machining, strict tolerance compensation must be controlled to avoid dimensional changes.
- Colored / Dyed Anodizing This process adds dyeing on the basis of sulfuric acid or hard anodizing, offering a rich variety of color options while maintaining excellent protective performance. It is widely used in high-end consumer products and brand identification items to enhance product added value.
Before anodizing, deburring, chemical cleaning, and etching pretreatment are required to ensure a uniform oxide layer. Post-treatment includes sealing to improve weather resistance. The choice of different anodizing schemes depends on part size, precision requirements, application environment, and budget.
Choosing a professional one-stop service for CNC machining + anodizing can shorten delivery time and ensure consistent quality. If your project requires anodizing treatment after aluminum CNC machining, welcome to contact us for customized solutions to help upgrade your products!