Introduction
Many makers of aluminum extrusion profiles find it difficult to find a solution to these challenges. The solutions to the surface problem with aluminum extruded profiles will be discussed further down the page. Aluminum extrusion profile manufacturers may, of course, improve their own film-forming technique if the circumstances are right for them to do so. oxidation.
A very thin oxide film is formed on the surface of aluminum extruded profiles in the atmosphere, which gives them a certain anti-corrosion ability;. However because the film layer is loose, porous, and uneven, it cannot be used as a reliable protective film layer, and the film layer is amorphous, which causes aluminum and its alloys to lose the luster of Dingyuan and prevents them from being used as a satisfactory decorative film for external use.
The oxide film that is generated from the chemical oxidation of aluminum extruded profiles. The thickness of this film ranges from 0.3 to 4 p”, and its features of softness, wear resistance, and anti-corrosion are inferior to those of anodic oxide film. Therefore, except for very specific reasons, it is seldom used by itself. Promote it to have a better adsorption capacity, make its surface paint, and effectively improve the corrosion-resistant parts of aluminum profiles and the oxide film after anodizing treatment; the thickness is generally 5-20P”, whereas the thickness of the modified anodic oxide film can reach 60-25p”.
Coatings form faster on extruded aluminum profiles than on other types.
The difference in appearance color that is acquired as a result of electrochemical conversion treatment is much more noticeable than the difference in oxide film that is created as a result of other process formulations.
When the purity of the aluminum extrusion is very high, the pace at which a film forms is quite slow; when the purity of the aluminum is very low, the converse is true.
Additionally, details on 7075 aluminum extrusion are available.
Because of this, the oxidation process has to be managed differently according to the various extruded aluminum profiles. In order to do this, it is prohibited to bundle together many kinds of aluminum extrusions in the same string. This is done so that the required amount of oxidation time may be maintained.
Aluminum extruded profiles may be processed in a variety of ways that serve as examples.
First, use a solvent-dampened cotton rag to remove oil stains, followed by repeated wipes with a dry cotton rag. This is step one in the degreasing process.
Degreased, then dipped in a chemical solution of 3 parts ammonium bifluoride, 3 parts chromium oxide, 2 parts sodium phosphate, 50 parts concentrated sulfuric acid, 6 parts boric acid, and 1 thousand parts water at 25 degrees Celsius to 40 degrees Celsius for 4.5 minutes to six minutes, then washed and dried.
When using this approach, you may bind in as little as 4 hours after treatment, and the connection will be strong as steel. Epoxy and epoxy-nitrile glues may be used on it.
â‘¢ Apply the following solution for anodizing after degreasing: Submersion in 22g/l concentrated sulfuric acid at a DC intensity of 1-1.5A/dm2 for 10-15 minutes, followed by a 10-minute soak in 100°C saturated potassium dichromate solution. You should soak for 5–20 minutes, then rinse and dry. Immediately after treatment, the metal’s surface becomes extremely reactive and more susceptible to contamination from dust, moisture, etc., hence it is imperative that this area be cemented.
The following coating quality will suffer from contamination of the surface layer of the aluminum extruded segment. A film may develop on the new metal surface by self-assembly if the aluminum profile does not use the aforementioned technique.
Chemical therapy, combined with mechanical treatment, or only chemical treatment on its own, In the case of metal surfaces that have been badly oxidized, the oxide layer is thick; as a result, aluminum extruded profiles cannot be simply cleaned with solvents and chemically treated; rather, it is recommended that mechanical treatment be performed first.