It is understood that the chemical descaling method of the filter generally includes pickling and alkali washing and rust removal (alkali electrolysis, alkali reduction, lye boiling, etc.), and the application of Zui is widely used in the pickling method. The definition of the pickling method is generally a method in which a metal product is immersed in a solution of various acids, a chemical action between the acid and the metal rust product, the insoluble rust product is converted into a soluble substance, and the metal surface is dissolved in the aqueous solution. .
The acid used in the pickling filter mainly includes sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, hydrofluoric acid and the like. It has been studied that the derusting ability of the hydrochloric acid solution is strong, and the mechanical action of sulfuric acid to generate hydrogen is large and the price is low, and it is widely used for derusting of steel. Nitric acid and hydrofluoric acid can be used for derusting non-ferrous metals such as aluminum products. Phosphoric acid has a relatively poor rust removal ability compared with hydrochloric acid sulphuric acid, but it is weak in rust and can react with the surface of copper and iron to form an insoluble film of iron phosphate salt. After washing, it has a temporary anti-rust effect in the air.
If the pickling method is compared with the general physical and mechanical method, the main advantage is that it does not cause deformation of the metal material, the treated surface is not rough, the operation is simple, the efficiency is high, and the rust of all corners of the metal product can be removed, and is suitable for a large number of small The product is derusted and does not require special equipment, and the cost is low.
Of course, as a chemical descaling method commonly used by related companies at present, the pickling method has a relatively obvious rust effect on the metal, and is prone to "hydrogen embrittlement" and affects the surface finish. Therefore, many related scholars have continuously studied and developed an alkali washing and rust removing method in recent years. The alkali washing and rust removing is carried out in a solution containing caustic alkali, carboxyacetic acid, a complexing agent and a foaming agent. Therefore, in the descaling process of the filter, the alkali washing method does not rust the base metal, does not occur "hydrogen embrittlement", and the metal surface can maintain a relatively complete finish, which is more practical.
The acid used in the pickling filter mainly includes sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, hydrofluoric acid and the like. It has been studied that the derusting ability of the hydrochloric acid solution is strong, and the mechanical action of sulfuric acid to generate hydrogen is large and the price is low, and it is widely used for derusting of steel. Nitric acid and hydrofluoric acid can be used for derusting non-ferrous metals such as aluminum products. Phosphoric acid has a relatively poor rust removal ability compared with hydrochloric acid sulphuric acid, but it is weak in rust and can react with the surface of copper and iron to form an insoluble film of iron phosphate salt. After washing, it has a temporary anti-rust effect in the air.
If the pickling method is compared with the general physical and mechanical method, the main advantage is that it does not cause deformation of the metal material, the treated surface is not rough, the operation is simple, the efficiency is high, and the rust of all corners of the metal product can be removed, and is suitable for a large number of small The product is derusted and does not require special equipment, and the cost is low.
Of course, as a chemical descaling method commonly used by related companies at present, the pickling method has a relatively obvious rust effect on the metal, and is prone to "hydrogen embrittlement" and affects the surface finish. Therefore, many related scholars have continuously studied and developed an alkali washing and rust removing method in recent years. The alkali washing and rust removing is carried out in a solution containing caustic alkali, carboxyacetic acid, a complexing agent and a foaming agent. Therefore, in the descaling process of the filter, the alkali washing method does not rust the base metal, does not occur "hydrogen embrittlement", and the metal surface can maintain a relatively complete finish, which is more practical.
YT-68
YT-68
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