How Do You Do a Good Job Anodizing 7-Series Aluminum Alloys?

The anodizing of 7 series aluminum alloys requires controlling many factors to be done well, and the following are several key points:

1. Cleaning: The surface of the 7 series aluminum alloy must be cleaned thoroughly. The use of specialized cleaning agents during cleaning can remove impurities or stains such as oil and oxides from the surface of the aluminum alloy. After cleaning, be sure to rinse thoroughly to ensure a dry surface.

2. Anti corrosion treatment: The 7 series aluminum alloy contains heavy metals such as zirconium and copper, which will affect the growth of the oxide film. Therefore, before soaking, the surface of the aluminum alloy should be subjected to a short period of acid washing treatment to remove the metal ions on its surface.

3. Electrolyte: Electrolyte is the key to affecting the uniformity and aesthetics of the oxide film. A suitable electrolyte can improve the effectiveness and speed of anodic oxidation. Common electrolytes include sulfuric acid, chromium oxide, fluoride, etc.

4. Control current density: The higher the current density, the higher the thickness and density of the oxide layer. However, excessive current density can lead to overheating of the electrolyte, coarsening of the oxide layer, and uneven color. Therefore, it is necessary to choose the appropriate current density based on different specifications of aluminum alloys, and to regularly test to ensure the growth of a suitable oxide layer.

5. Temperature control: The anodizing temperature of the 7 series aluminum alloy should be higher than that of other aluminum alloys, and generally needs to be controlled above 15 ℃ to have an ideal oxide layer formation effect.

The above are several key points to consider when anodizing 7-series aluminum alloys, and each link needs to be strictly controlled during the production process. At the same time, it is also important to seal the anodized aluminum alloy to improve the corrosion resistance and wear resistance of the oxide layer.