Seamless pipe pickling passivation

Introduction to pickling and passivation:
It is suitable for pickling and passivation treatment of carbon steel, stainless steel (seamless pipes), ferrous metals (castings, forgings, sheet metal parts, etc.) to remove rust and remove the black oxide layer to improve the anti-rust and anti-corrosion performance of the pipe surface. It is widely used in machinery manufacturing, petrochemical industry, transportation industry, metallurgy, electric power, textile printing and dyeing industry, mining, power plant, shipbuilding industry, machinery and other industries.

Seamless pipe (SMLS) pickling process: degreasing---washing---pickling---washing---sealing agent

Generally, there are two pickling methods for seamless steel pipes (carbon steel), as follows:
1. Sulfuric acid: dilute to a concentration of about 20%, heat to 60-65 degrees, and generally wash for 20-30 minutes

2. Hydrochloric acid: also dilute to a concentration of about 20%, and pickle directly at room temperature, usually for 20-30 minutes

Features and advantages of pickling and passivation products:

1. Carbon steel pickling and passivating solution combines pickling and passivation into one. It does not require water washing to remove rust and black oxide layer, which greatly improves labor productivity.
2. The use and operation of the pickling passivation solution is very convenient. Tank washing and soaking are performed using small and medium-sized carbon steel pipe fittings. After treatment, the pipe surface has better corrosion resistance and rust prevention.
3. The use temperature is 5-30 degrees Celsius, and the pickling and passivation takes about 5-15 minutes to achieve the pickling effect.

The result after processing:

1. The treated carbon steel workpiece improves the corrosion resistance of carbon steel. The anti-rust effect is affected by many factors such as the workpiece material, surface condition, climate, air pollution conditions, dilution water quality, construction methods, workpiece stacking methods, etc.
2. The pickling passivation solution does not contain harmful substances, and the wastewater can be discharged directly after neutralization and has no impact on the environment.

Things to note when pickling and passivating seamless pipes:

1. Pickling and passivation operations must be carried out outdoors or in a well-ventilated room.
2. Operators should wear labor protection equipment before operating, and it is strictly forbidden to contact the skin with the pickling passivation solution. If accidentally touched, rinse immediately with clean water.
3. The containers and tools used for pickling and passivation treatment should be acid-resistant plastic tanks.
4. The treated residues and wastewater must be neutralized with lime milk or sodium hydroxide in time to prevent environmental pollution.
5. Do not operate under strong sunlight to prevent the stainless steel pickling passivation solution from drying out and affecting the passivation effect.