Acetic Acid Pickling Process for Fast Removal of Oxidized Skin
Acetic acid pickling is a widely used process for the rapid removal of oxidized skin from metal surfaces. The process is relatively quick and easy to perform, and can be used to treat a wide variety of metals, including steel, aluminum, copper, brass, and zinc. The process involves the application of a diluted solution of acetic acid, which reacts with the oxidized layers of the metal, causing them to dissolve and come off of the surface.
The first step in the process is to prepare the work piece by cleaning and degreasing it as much as possible. This is done to ensure that the acid will be able to penetrate the surface and reach the areas of oxidation. Once the surface is clean and dry, the acetic acid solution can be applied. Generally, a dilution of approximately 10-15% is recommended. Depending on the thickness of the oxidized layer and the condition of the surface, the concentration of acetic acid may need to be adjusted higher or lower.
Once the solution has been applied, it should be allowed to sit on the surface of the work piece for 8-12 minutes, or until the oxidation begins to lift off of the surface in readily visible chunks or flakes. If the oxidized layer is particularly thick, or the solution is too weak, additional applications may be necessary. After the oxidation has been removed, the surface should be rinsed off in water to remove any remaining traces of acid or contaminants.
Depending on the desired finish, additional steps such as passivating, chromating, polishing, or painting may be necessary. These steps can be used to further protect the work piece and create a desired appearance. Furthermore, additional treatments may be needed if the work piece is subjected to harsh environments.
In summary, acetic acid pickling is a quick and easy process for the removal of oxidized layers from metal surfaces. The process is relatively inexpensive and can be used with a wide variety of metals, including steel, aluminum, copper, brass, and zinc. The process should begin with the surface being properly cleaned and degreased, followed by the application of a dilute solution of acetic acid. The acid should be allowed to sit on the surface for 8-12 minutes, after which it should be rinsed with water to remove any remaining acid or contaminants. Depending on the desired finish, additional steps such as passivating, chromating, or polishing may be necessary.
