As we all know, a seamless steel tube has good corrosion resistance and is a kind of pipeline resistant to weak acid substances such as steam. Seamless steel tube is widely used in our daily life. However, if the seamless pipe is directly placed in a strong alkali or strong acid environment, corrosion will also occur. Therefore, in order to avoid not affecting the use in the later period, it is necessary to do anti-corrosion work in advance and maintain it well, so that it can be reasonably applied in production and life. The following seamless steel tube company will introduce those factors that will cause seamless steel tubes to be corroded.

Chemical corrosion

1. Surface pollution: The oil, dust, acid, alkali, salt, etc. attached to the surface are converted into the corrosive medium under certain conditions, and chemically react with some components of seamless steel tube, resulting in chemical corrosion and rust.

2. Surface scratches: The damage to the passivation film by various scratches reduce the protective ability of seamless steel tubes, and it is easy to react with chemical media, resulting in chemical corrosion and rust.

3. Cleaning: After pickling and passivation, the cleaning is not clean, resulting in residual liquid remaining, which directly corrodes the seamless steel tubes (chemical corrosion).

Electrochemical corrosion

1. Carbon steel pollution: The scratches and corrosive medium caused by contact with carbon steel parts form a primary battery and cause electrochemical corrosion.

2. Cutting: The adhesion of rust-prone substances such as cutting slag and splashing and the corrosive medium form a primary battery to produce electrochemical corrosion.

3. Baking school: The composition and metallographic structure of the flame heating area change unevenly, and form a galvanic battery with the corrosive medium to produce electrochemical corrosion.

4. Welding: Physical defects (undercut, pores, cracks, lack of fusion, lack of penetration, etc.) and chemical defects (coarse grains, poor chromium at grain boundaries, segregation, etc.) in the welding area and corrosive media form galvanic cells to generate electricity. chemical corrosion.

5. Material: Chemical defects (uneven composition, S, P impurities, etc.) and surface physical defects (porosity, blisters, cracks, etc.) of stainless steel are conducive to the formation of galvanic cells with corrosive media to produce electrochemical corrosion.

6. Passivation: The passivation effect of pickling is not good, resulting in uneven or thin passive film on the surface of stainless steel, which is easy to form electrochemical corrosion.

7. Cleaning: The remaining pickling passivation residue and the products of chemical corrosion of stainless steel form electrochemical corrosion with stainless steel parts.

The above is about the corrosion of the surface of the precision seamless steel tube. I hope it will help you. Tianyang Steel Tube, as a seamless steel tube company, provides seamless steel tube wholesale. The products are of good quality. Welcome to consult and buy.