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Two best ways to remove scale in sheet metal processing

Update:14-03-2018
Summary:

The simplest overview of sheet metal processing is the […]

The simplest overview of sheet metal processing is the processing of materials on different types of metals. There is also a certain demand for metal materials in the process of sheet metal processing. Of course, this is not only the need for sheet metal integrity, but also on the metal. The appearance also needs certain requirements, such as whether the metal is excessively oxidized, and the process of sheet metal processing requires that the metal cannot be oxidized.
In addition, the thickness of the metal is also required to exceed the thickness of the product after the treatment; however, in practice, there is almost no metal that has not been oxidized. What about the oxidized metal?
The stainless steel in the processing operation is usually disposed by coiling, tying, welding, or by artificial external heat treatment, resulting in black scale. This type of gray-black oxide scale is relatively strong, containing NiCr2O4 and NiF two EO4 components. In the past, it was basically removed by the strong corrosion method using hydrofluoric acid and nitric acid. However, this method is gradually abandoned by the sheet metal processing industry due to environmental pollution, harmful to the human body, relatively large corrosiveness, and high cost.
Currently, there are two types of oxide treatment methods in sheet metal processing plants:
1. By chemical method: Use a non-polluting pickling passivation paste and room temperature non-toxic cleaning solution with inorganic additives. The intention to whiten the stainless steel nature. The metal equipment handled by this method appears to be a matte shade. This method is more applicable to large-scale and messy products.
2. Sand blasting / shot peening: In principle, the method of spraying micro glass beads is used to remove the black oxide scale on the surface.

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