Finishing Technology’s Anodizing Capabilities
Acid Etch

Acid etch is the chemical process for removing the silicon rich surface of an aluminum die cast to helps produce a more uniform, leveled surface before subsequent chemical treatments like anodizing. During this process the surface imperfections such as extrusion lines and scratches are smoothed out, producing a more uniform appearance that can range from a bright, shiny aluminum surface to a more matte, satin finish.

The Acid Etch process includes:

• An alkaline clean – especially if machining oil or other heavy soils are present
• Acid etch
• Hot deionized water rinse
• Drying

The benefits of Acid Etch include:

• Residue-free surface
• Minimized surface irregularities on hard-to-treat aluminum die castings
• More uniform appearance for greater aesthetic appeal
• Improved ability to accept anodize colors
• Increased the effectiveness of subsequent chemical treatments on the aluminum castings

Next: Considerations When Ordering Aluminum Anodizing from Finishing Technology