Black steel pipe looks black from appearance. The dark color comes from the iron-oxide formed on its surface during manufacturing. The black pipe is a light coating and provides only the barest protection. Black pipe will rust outdoors.
1. Reasons why black steel pipes rust
The main reasons why black steel pipe rusts are as follows:
(1) Effect of chloride ions
Chloride ions will accelerate the corrosion of stainless steel. The higher the chloride ion content in the water, the faster the steel pipe will corrode.
(2) Influence of environmental factors
When black steel pipes are used or stored in areas such as seaside, harbors, and islands, they are susceptible to corrosion by seawater and salt spray, leading to rust. In addition, acidic environments and normal temperature and humid environments will also accelerate the corrosion of steel pipes, causing them to rust quickly.
(3)Material issues
If the quality of the black steel pipe is poor, such as using substandard raw materials or improper handling during the welding process, it may cause the black steel pipe to rust.
(4)Human factors
During transportation, if you do not pay attention to the maintenance of the pipeline, the pipeline may be contaminated by contaminating and corrosive chemical products, or damaged by sharp objects, which will cause the black steel pipe to rust.
(5)Other factors
If dealers do not pay attention to the maintenance of pipelines during transportation, or use corrosive chemical products to clean stainless steel in highly polluted areas (such as seashores, chemical plants, brick factories, electroplating and pickling plants, water plants, sewage treatment plants, etc.), this will It may also cause black steel pipes to rust.
2. How to remove rust from black steel pipes
(1)Clean and remove rust
Cleaning and rust removal do not use ordinary water, but use chemicals to remove rust on the surface of steel pipes, dissolve and peel off the rust, and achieve the effect of rust removal. But this method can only play a supporting role.
2. Pickling and rust removal
Pickling and rust removal is a commonly used method at present. Pickling and rust removal are carried out through two methods, chemical and electrolysis, which can remove oxide scale and rust stains and make the surface of the steel pipe reach good cleanliness and roughness. However, It will cause pollution to the environment and needs to be improved.
3. Mechanical rust removal
Mechanical rust removal uses mechanical tools to remove rust from steel pipes. Currently, the most commonly used method is to rub the surface of the steel pipe with a rust-removing wire brush to achieve the effect of rust removal. It can remove oxide scale, welding slag and rust on the surface of steel pipes, and it is one of several rust removal methods currently available.
1. Reasons why black steel pipes rust
The main reasons why black steel pipe rusts are as follows:
(1) Effect of chloride ions
Chloride ions will accelerate the corrosion of stainless steel. The higher the chloride ion content in the water, the faster the steel pipe will corrode.
(2) Influence of environmental factors
When black steel pipes are used or stored in areas such as seaside, harbors, and islands, they are susceptible to corrosion by seawater and salt spray, leading to rust. In addition, acidic environments and normal temperature and humid environments will also accelerate the corrosion of steel pipes, causing them to rust quickly.
(3)Material issues
If the quality of the black steel pipe is poor, such as using substandard raw materials or improper handling during the welding process, it may cause the black steel pipe to rust.
(4)Human factors
During transportation, if you do not pay attention to the maintenance of the pipeline, the pipeline may be contaminated by contaminating and corrosive chemical products, or damaged by sharp objects, which will cause the black steel pipe to rust.
(5)Other factors
If dealers do not pay attention to the maintenance of pipelines during transportation, or use corrosive chemical products to clean stainless steel in highly polluted areas (such as seashores, chemical plants, brick factories, electroplating and pickling plants, water plants, sewage treatment plants, etc.), this will It may also cause black steel pipes to rust.
2. How to remove rust from black steel pipes
(1)Clean and remove rust
Cleaning and rust removal do not use ordinary water, but use chemicals to remove rust on the surface of steel pipes, dissolve and peel off the rust, and achieve the effect of rust removal. But this method can only play a supporting role.
2. Pickling and rust removal
Pickling and rust removal is a commonly used method at present. Pickling and rust removal are carried out through two methods, chemical and electrolysis, which can remove oxide scale and rust stains and make the surface of the steel pipe reach good cleanliness and roughness. However, It will cause pollution to the environment and needs to be improved.
3. Mechanical rust removal
Mechanical rust removal uses mechanical tools to remove rust from steel pipes. Currently, the most commonly used method is to rub the surface of the steel pipe with a rust-removing wire brush to achieve the effect of rust removal. It can remove oxide scale, welding slag and rust on the surface of steel pipes, and it is one of several rust removal methods currently available.
