When the stainless steel is heated, the oxide skin is also formed. Although there is no thick oxidation leather on the carbon steel forgings, the adhesive force with the matrix metal is strong and strong, so that the die and the cutting tools are quickly worn. Therefore, before the machining process, the oxide scale must be removed from the billet and the final forging. Pickling and sandblasting are good finishing methods. The best way is to wash the forgings first and then do sandblasting.
Sand spray finishing equipment (sandblasting machine) is the use of compressed air to form a high-speed jet beam (shot peening glass beads, steel balls, steel sand, quartz sand, emery sand, iron sand, sand) to the surface of the required disposal work pieces, laser cutting machine laser cutting equipment cast iron channels to make the exterior exterior appearance of the workpiece Mechanical performance changes, because of the impact and cutting effect of the abrasive to the surface of the workpiece, make the workpiece's appearance of a certain degree of cleanliness and roughness, and improve the mechanical properties of the workpiece surface, thus improving the fatigue resistance of the workpiece and increasing the adhesion between the workpiece and the coating.
2. pickling and pickling usually means cleaning the appearance of metal.
Usually the products are immersed in sulfuric acid and other aqueous solutions to remove the oxide film from the metal surface. It is the pre disposal or central disposal of electroplating, enamel and rolling technology.
(1) the use of acid solution to remove the oxide scale and rust on the surface of steel is called pickling. Iron oxides (Fe3O4, Fe2O3, FeO, etc.), such as oxide scales and rust, react with acid solutions to form salts and dissolve them in acid solutions. Acid for pickling is sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, chromic acid, hydrofluoric acid and mixed acid. Sulphuric acid and hydrochloric acid are the most commonly used. The pickling technology mainly consists of pickling acid washing, acid washing and acid removing. Usually, the method of impregnating acid is often used, and the method of eruption can be used in mass production. Iron and steel parts are usually pickled in 10% to 20% (volume) sulfuric acid solution at a temperature of 40 degrees Celsius. When the iron content in solution exceeds 80g/L, ferrous sulfate exceeds 215g/L, replace acid pickling solution. At room temperature, 20% ~ 80% (volume) of hydrochloric acid is used to pickle steel, which is not easy to attack corrosion and hydrogen embrittlement. Because acid has great corrosion effect on metals, corrosion inhibitors are needed. After cleaning, the metal is silvery white and passivated to improve the corrosion resistance of stainless steel.
(two) in order to eliminate the adsorption on the surface of diatomite carrier and reduce the peak tailing of color spectrum, the carrier should be treated by acid washing or caustic washing before application. Pickling is to carry the carrier with 6mol/L hydrochloric acid to boil 2H or concentrated hydrochloric acid to heat to dip and boil 30min, filtering, washing with water to neutral, drying. Pickling can remove impurities such as iron, aluminum, calcium, magnesium and so on, but can not remove silanol. Acid pickling is suitable for the analysis of acid samples.
标签:   钣金加工 钣金加工厂家 钣金