Summary Of Pickling Of Precision Seamless Steel Pipe
Summary of pickling of precision Seamless Steel Pipe
The method of removing oxidized skin and rust on steel surface by acid solution is called pickling. Oxides ($literal, $literal, Feo, etc.) of iron, such as oxidized skin and rust, react chemically with acid solutions and are removed by dissolving salts into acid solutions. Acid for pickling is sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and mixed acid.
Precision seamless steel tube pickling common media:
Sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid. Pickling inhibitor must be added to prevent acid corrosion of metals.
Pickling technology of precision Seamless Steel Pipe
There are dipping pickling method, spray pickling method and acid paste Derusting method. General use of dipping pickling method, large-scale production can be used injection method. Iron and steel parts generally in $number (volumetric) sulfuric acid solution pickling, temperature of 40 Shan. When the iron content in the solution exceeds Intergo L and the ferrous sulfate exceeds 215g L, the pickling solution should be replaced. At room temperature, the 20 (volumetric) hydrochloric acid solution is used to pickling steel, and the phenomenon of corrosion and hydrogen embrittlement is not easy to occur. Because of the corrosive effect of acid on metals, it is necessary to add corrosion inhibitors. After cleaning, the metal surface is silvery white, while passivation surface, improve corrosion resistance of stainless steel. In order to eliminate the surface adsorption of diatomite carrier and reduce the chromatographic peak trailing, the carrier should be pickled or alkali washed before use. Pickling is the carrier with 6mol I hydrochloric acid immersion boiling 2h or concentrated hydrochloric acid heating leaching 30min, filtration, with water to neutral, drying. Pickling can remove the surface of iron, aluminum, calcium, magnesium and other impurities, but can not remove the silicon alcohol base. Acid pickling carrier is suitable for analyzing acidic samples.