What is the process flow and function of seamless pipe pickling?

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In the field of industrial manufacturing,seamless tubes,as an important material,are widely used in various equipments and systems.However,seamless pipe in the use process,often due to the impact of environmental,media and other factors,surface defects such as oxide,rust,which not only affects its beauty,but also reduces its corrosion resistance and service life.In order to improve the surface quality of seamless pipe and enhance its corrosion resistance,pickling treatment has become an important surface treatment method.This paper will discuss the processing flow and function of seamless pipe pickling in detail.

一.seamless pipe pickling process

The processing process of seamless pipe pickling mainly includes degreasing,washing,pickling,washing,passivation(or sealing agent treatment)and other steps.The details and operations of these steps are described below.

Step 1 Skim

Degreasing is the first step of pickling treatment,the purpose is to remove grease,stains and other impurities on the surface of seamless pipe.These impurities will not only affect the pickling effect,but also may produce chemical reactions during the pickling process,resulting in spots,corrosion and other problems on the surface of the seamless pipe.There are many kinds of degreasing methods,such as lye degreasing,solvent degreasing and electrochemical degreasing.Lye degreasing is to remove grease from seamless tube surface by saponification reaction with alkaline solution.Solvent degreasing is the use of organic solvent to dissolve grease,dissolve it and take it away.Electrochemical degreasing is the decomposition and removal of grease from the seamless tube surface through electrolysis.

Step 2 Wash

After degreasing is complete,the seamless tube needs to be washed to remove the lye,solvent or electrolytic products remaining during the degreasing process.The quality of washing has an important influence on the subsequent pickling effect.If the water is not thoroughly washed,the residual impurities will react with the pickling solution,affecting the pickling effect.Therefore,water should be used when washing and washed several times to ensure that the seamless pipe surface is clean and free of impurities.

3.Pickling

Pickling is the core step in the seamless pipe treatment process,the purpose is to remove the defects of the seamless pipe surface such as oxide and rust through the chemical reaction of pickling solution.Pickling liquid is usually prepared from acids(such as sulfuric acid,hydrochloric acid,nitric acid,etc.)according to a certain concentration,temperature and time.During pickling,the pickling solution reacts with the oxide on the surface of the seamless tube,dissolving it and removing it.At the same time,the pickling liquid can also make the surface of the seamless pipe uniform and smooth,improve its corrosion resistance.

There are many kinds of pickling methods,commonly used are soaking pickling,spray pickling and brush pickling.Soaking pickling is to immerse the seamless tube completely in the pickling solution,and make the pickling solution fully contact and react with the seamless tube surface through soaking.Spray pickling is to spray the pickling liquid evenly on the seamless pipe surface through the spray equipment;Brush pickling is the use of brushes and other tools to apply the pickling liquid evenly on the surface of the seamless tube.Different pickling methods are suitable for different seamless tube types and surface conditions.

Step 4 Wash

After pickling is completed,it is also necessary to wash the seamless pipe to remove the pickling liquid remaining in the pickling process.The quality of washing has an important impact on the subsequent treatment and service life of seamless pipes.If the water is not thoroughly washed,the residual acid wash will corrode the surface of the seamless pipe and even affect its performance.Therefore,water should be used when washing and washed repeatedly to ensure that the seamless pipe surface is clean and no residue.

5.Passivation(or sealer treatment)

Passivation is the final step in the pickling process to form a dense protective film on the surface of the seamless pipe to improve its corrosion resistance.The principle of passivation is to generate a dense oxide film on the surface of the seamless tube through a chemical reaction to isolate the seamless tube from the corrosive medium.This layer of protective film not only has excellent corrosion resistance,but also can repair the small defects on the surface of the seamless pipe to a certain extent.

There are many kinds of passivation methods,commonly used are chemical passivation and electrochemical passivation.Chemical passivation is through the use of passivation agents(such as nitric acid,chromate,etc.)and seamless tube surface chemical reaction,passivation film;Electrochemical passivation is to generate a dense oxide film on the surface of the seamless tube through electrolysis.In addition to passivation treatment,sealing agents can also be used to seal seamless pipes.The sealing agent is a special chemical solution that can chemically react with the surface of the seamless tube to form a dense protective film.Sealer treatment is similar to passivation treatment,which can significantly improve the corrosion resistance of seamless pipes.

Second,the role of seamless pipe pickling.

Seamless pipe pickling,as an important surface treatment method,is widely used and plays a significant role in industrial production.Specifically,the role of seamless pipe pickling is mainly reflected in the following aspects:

1.Remove surface defects

In the process of production,processing and transportation,seamless pipes often have surface defects such as oxide skin and rust for various reasons.These defects not only affect the beauty of the seamless pipe,but also reduce its corrosion resistance and service life.Pickling treatment can remove these surface defects through chemical reaction,so that the seamless pipe surface becomes uniform,smooth,and improve its surface quality.

2.Improve corrosion resistance

Pickling treatment can not only remove the oxide and rust on the surface of seamless pipe,but also form a dense protective film on the surface of seamless pipe.This layer of protective film can isolate the direct contact between the corrosive medium and the seamless pipe,thus significantly improving the corrosion resistance of the seamless pipe.This is particularly important for seamless tubes that work in harsh environments,extending their service life and reducing replacement and repair costs.

3.Improve surface finish and smoothness

Pickling treatment can remove the bumps and burrs and other defects on the seamless pipe surface,making its surface smooth and smooth.This not only improves the appearance quality of the seamless tube,but also makes it easier to clean and disinfect.In some applications with high requirements for surface finish and smoothness(such as food,medical,etc.),pickling treatment can significantly improve the applicability of seamless tubes.

4.Improve production efficiency

Pickling treatment can significantly improve the production efficiency of seamless pipes.The traditional physical sealing method requires coating anti-rust oil or grease on the surface of the seamless pipe,which not only increases the production cost,but also increases the production process and cycle.Pickling treatment can complete the surface treatment and anti-corrosion treatment of seamless pipes in a short time,thereby shortening the production cycle and improving production efficiency.

5.Increase the added value of products

Pickling can significantly increase the added value of seamless pipes.Pickling seamless pipes have better surface quality,better corrosion resistance,higher finish and smoothness,and can meet higher grade and more demanding applications.This not only improves the market competitiveness of seamless pipe,but also brings more economic and social benefits to enterprises.

1.Chemical industry

In the chemical industry,seamless pipes are often used to transport a variety of corrosive media(such as acid,alkali,salt,etc.).Pickling treatment can significantly improve the corrosion resistance of seamless pipes,extend their service life,and reduce the cost of replacement and maintenance.

2.Textile industry

In the textile industry,seamless tubes are often used in the transmission parts and support parts of textile machinery.Pickling treatment can improve the surface quality and finish of seamless tubes,making them easier to clean and maintain,thus improving the operating efficiency and stability of textile machinery.

3.Paper industry

In the paper industry,seamless tubes are often used for conveying parts and support parts of paper machinery.Pickling treatment can remove the dirt and impurities on the surface of seamless pipe,reduce its interference and influence on the papermaking process,and improve the quality and efficiency of papermaking.

4.Food processing industry

In the food processing industry,seamless tubes are often used to transport food raw materials and finished products.Pickling treatment can improve the cleanliness and hygiene of seamless tubes to ensure food safety and hygiene.

5.Healthcare

In the medical industry,seamless tubes are often used in transmission parts and support parts of medical devices.Pickling treatment can improve the surface quality and finish of seamless pipe,reduce its interference and influence on the medical process,and improve the stability and reliability of medical equipment.

四.Conclusion

Seamless pipe pickling,as an important surface treatment method,is widely used and plays a significant role in industrial production.Through pickling treatment,the defects such as oxide and rust on the surface of seamless pipe can be removed,and the surface quality and corrosion resistance of seamless pipe can be improved.At the same time,pickling can also improve the surface finish and smoothness of seamless pipe,improve its production efficiency and added value.Therefore,pickling treatment is an indispensable and important process in the production and application of seamless pipes.

With the continuous development of science and technology and the continuous progress of industrial technology,the processing process and process method of seamless pipe pickling are also constantly innovative and improved.In the future,we can look forward to the emergence of more efficient,environmentally friendly and energy-saving pickling treatment methods and technologies to provide better service and guarantee for the production and application of seamless pipes