Why Anodizing Is the Standard Finish
Industrial aluminum profiles are usually not directly put into use after being produced. To improve the corrosion resistance and surface hardness, they are generally given an anodic oxidation treatment. In this process, the two ends of the profile act as electrodes and an electric current forms a dense artificial oxide film on the surface through the electrolytic effect. This transparent, hard oxide film greatly improves the service life of the profiles. After anodizing, additional finishing steps further improve the result.
Hot Water Rinsing
The purpose of hot water rinsing is to age the oxide film. The water temperature and rinsing time must be controlled: water that is too hot or rinsing that lasts too long leads to thinning of the oxide film, and if the film has been colored, it also causes color fading. The water temperature should be controlled at 40 to 50 degrees C and the rinsing time between 30 and 60 seconds.
Drying
After hot water rinsing, industrial aluminum profiles are hung diagonally on racks so that water can flow naturally from the cavities. Natural drying keeps the gloss of the oxide film unaffected and gives a more natural appearance.
Aging
The aging method can be determined according to climatic conditions: on sunny summer days, exposure to sunlight works well; on rainy days or in winter, an oven can be used. The process conditions are a temperature of 40 to 50 degrees C for 10 to 15 minutes, stabilizing the film structure and hardness.
Optional Follow-Up Treatments
Beyond the standard rinse, dry, and age sequence, profiles may receive sealing, coloring, or protective coatings depending on the application. Sealing closes the pores of the oxide film to improve stain resistance, and organic coatings add color and UV protection.
Frequently Asked Questions
Q: Why anodize aluminum profiles?
A: To form a dense oxide film that improves corrosion resistance and surface hardness.
Q: What temperature is used for hot water rinsing?
A: 40 to 50 degrees C for 30 to 60 seconds.
Q: Why control rinsing time?
A: Excessive time or temperature thins the film and fades colored finishes.
Q: How are profiles dried?
A: Hung diagonally so water flows out, then naturally dried.
Q: What is the oven aging condition?
A: 40 to 50 degrees C for 10 to 15 minutes.
Q: What does sealing do?
A: It closes the pores of the oxide film, improving stain and corrosion resistance.
For anodized aluminum profile supply, contact our sales team.