During the processing of stainless steel, the sheet metal is processed by rolling plate, ligation, welding or heat treatment by artificial surface fire. The sheet metal of Suzhou Xin Ma Tai produces black oxide skin. This hard gray black oxide skin is mainly composed of two EO4 components of NiCr2O4 and NiF. But this method is costly, pollute the environment, is harmful to human body, corrosiveness, and is gradually eliminated. At present, there are two ways to treat oxide scale in sheet metal processing plants.
(1) sandblasting (pellet) method: mainly using the method of spraying micro glass beads to remove the black oxide scale on the surface.
(2) chemical method: sheet metal processing uses a pollution-free pickling and passivation paste and washing agent with normal temperature and harmless inorganic additives. So as to achieve the purpose of albinism of stainless steel. After processing, it basically looks like a dull color. This method is more suitable for large and complex products.