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pickling of semless steel pipe
publishers:管理员 Release time:2012-2-3 15:00:37 read:3848times
 

In production process of cold drawn semless steel pipe, pickling is an unique process.

Pickling: wash away the surface corrosion of the substrate material and rolling the skin of steel pipe use acid .

Generally immersed in the aqueous solution of sulfuric acid and other parts in order to remove the metal surface of the oxide film. Plating, enamel, rolling and other pre-treatment process or intermediate processing

(A) the use of acid solution to remove oxide and corrosion on the steel surface material is called pickling. Oxidation, rust and other iron oxide (Fe3O4, Fe2O3, FeO, etc.) react chemically with the acid solution, the formation of salts soluble in the acid solution was removed. Pickling acid, sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, chromic acid, hydrofluoric acid and mixed acid and so on. The most commonly used is sulfuric acid and hydrochloric acid. Pickling dipping pickling, spray pickling and sour cream rust law. Usually used dipping pickling method, injection method can be used in mass production. The steel parts are generally 10% to 20% (by volume) sulfuric acid pickling, the temperature is 40 ℃. When the iron content in the solution of more than 80g / L ferrous sulfate is more than 215g / L, should be replaced acid lotion. Room temperature, 20% to 80% (volume) of hydrochloric acid pickling of steel, less prone to corrosion and hydrogen embrittlement phenomena. Acid on the corrosion of metals, you need to add a corrosion inhibitor. After cleaning the metal surface into a silver-white, while surface passivation to improve the stainless steel corrosion resistance.


(B) In order to eliminate diatomite carrier surface adsorption to reduce peak tailing and the need for pickling or alkaline cleaning treatment, the carrier prior to use. Pickling is the carrier 6mol / L hydrochloric acid leaching cook 2h or concentrated hydrochloric acid heated infuser 30min, filtered, washed until neutral, dried. Pickling to remove surface impurities such as iron, aluminum, calcium, magnesium, but can not remove the silanol. The pickling carrier suitable for the analysis of acidic samples.


(C) commonly used in pickling the acid: hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid. Sure to add the pickling acid inhibitor, to prevent acid corrosion on the metal

 

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