Commonly used stainless steel surface treatment technology has the following treatment methods:
Surface color whitening
Surface color whitening treatment: stainless steel in the process of processing, after coiling, tying, welding or artificial surface heating and heat treatment, resulting in black oxide scale. This hard gray-black oxide scale is mainly composed of NiCr2O4 and NiF EO4. In the past, hydrofluoric acid and nitric acid were generally used for strong etching.
However, this method is costly, pollutes the environment, is harmful to the human body, and is highly corrosive and is gradually being eliminated. Currently there are two main methods for treating oxide scales:
(1) Sandblasting (pill) method: The method of spraying micro glass beads is mainly used to remove the black oxide scale on the surface.
(2) Chemical method: Use a non-polluting pickling passivation paste and a non-toxic, non-toxic cleaning solution with inorganic additives. In order to achieve the purpose of the white color of stainless steel. After processing it basically looks like a dull color. This method is more suitable for large and complex products.