Pickling process of acid liquid is usually a mixture of acid, mainly such as sulfuric acid, nitric acid and hydrofluoric acid, the mixed acid corrosion resistance is very strong, at the same time has a strong oxidizing, higher the temperature of the corrosive medium, the corrosion resistance of anti-corrosion materials high demands are put forward.Stainless steel pickling line process from production to the waste water waste gas recovery system, each link has the very strong corrosion condition, so the stand or fall of anti-corrosion material selection is directly related to the equipment, workshop floor, waste, waste water, waste gas recycling system of the place such as normal use.Send InquiryChat Now
Acid cleaning equipment production line
The oxide (Fe3O4, Fe2O3, FeO, etc.) of iron oxide (Fe3O4, Fe2O3, FeO, etc.) reacts with the acid solution to form the salts dissolved in the acid solution.
Acid - washing acid includes sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, chromic acid, hydrofluoric acid and mixed acid.The most commonly used are sulfuric acid and hydrochloric acid.
Pickling process mainly includes pickling pickling method, spray pickling method and acid paste cleaning method.It is generally used for pickling pickling, and spray method can be used in mass production.
Industrial concentrated sulfuric acid on the market usually contains H2SO475%~97% (mass fraction), or brown industrial sulfuric acid solution, which contains H2SO475%~78%(quality score).
Steel parts is in commonly 10% ~ 20% (volume) sulfuric acid pickling solution, temperature of 40 ℃.When the iron content in the solution exceeds 80g/L and the ferrous sulfate exceeds 215g/L, the acid solution should be replaced.At normal temperature, the acid washing of steel is carried out by the solution of 20%~80%(volume), which is not easy to be corroded and hydrogen embrittlement.Because of the corrosive action of acids on metals, corrosion inhibitors need to be added.After cleaning, the metal surface is silver-white, and the surface is passivated to improve the corrosion resistance of stainless steel.The process of removing the surface of the workpiece and adhering salt is called acid pickling.
In order to eliminate the surface adsorption of diatomite carrier and reduce the tail of chromatographic peak, the carrier should be treated with pickling or alkaline cleaning before use.Pickling is to boil 2h or concentrated hydrochloric acid in 6mol/L hydrochloric acid for 30min, filtration, water to neutral, drying.Pickling can remove the surface iron, aluminum, calcium, magnesium and other impurities, but can not remove the silyl alcohol.The acid - washing carrier is suitable for the analysis of acid samples.
At present, the acid cleaning process is adopted to remove the thick oxide skin on the surface of stainless steel, with high temperature and long pickling time, resulting in high processing cost.In addition, the process of normal temperature removal is good for removing the thin oxide skin, which is not ideal for thick oxide skin, especially the black slag in welding.In view of this situation, the author, based on the successful experience of pre-treatment of stainless steel, adopted two-step pickling integrated treatment technology, and studied successfully the rapid pickling process of stainless steel.The process temperature can quickly remove thick stainless steel surface, especially butt it black and inclusion removal effect is good, pickling treatment after surface bright