In order to prolong the service life of industrial aluminum profiles, they need to be oxidized to obtain a protective film. However, after the oxidation process, due to the porous structure and strong adsorption performance of the anodized film, the surface of the industrial aluminum profile is still easily contaminated, so we need to seal it.
When closing the oxide film pores, we can use different methods to accomplish the requirements. In fact, for the oxidation processing of industrial aluminum profiles, the commonly used sealing methods mainly include hot water sealing, steam sealing and salt solution sealing. Below we will introduce the main contents of these three methods respectively, hoping to help everyone.
Hot water closed. The main principle is to make the surface of the oxide film and the aluminum oxide on the pore wall undergo a hydration reaction in hot water to generate hydrated aluminum oxide, thereby increasing the volume of the oxide film. In this way, the requirements of sealing holes can be achieved. For the oxidation processing of industrial aluminum profiles, the technical conditions for hot water sealing mainly include: the temperature is maintained at 95 to 100 ° C, the pH value is between 5.5 and 6, and the time is 10 to 30 minutes.
Steam closed. Comparatively speaking, this method is better than the first one, but the cost will be higher. Under normal circumstances, steam sealing is mainly used in occasions with high sealing requirements in the oxidation processing of industrial aluminum profiles, such as some decorative parts. The technical conditions of steam sealing include: the temperature is 100 to 110 ° C, and the pressure is controlled between 0.05 and 0.1 MPa.
Salt solution blocked. If this method is used for blocking, different chemicals can be selected for blocking according to the needs, such as dichromate blocking, or blocking with hydrolysis salts. Under normal circumstances, the hydrolysis salt sealing method is mainly used for the sealing treatment of industrial aluminum profiles after oxidative processing and coloring.
The anodic oxidation sealing process of industrial aluminum profiles is widely used. It can not only protect the oxide film, but also prevent anodic oxidation dyeing and fading, and enhance wear resistance. It is a very important process after anodic oxidation.