Six Major Factors Causing Corrosion of Air-Cushioned Shield Sluices

Pneumatic shield gates are mostly built in rivers, reservoirs, lakes and other areas. They are key structures for flood discharge and water retaining, and also a common type of gate. They have the advantages of high pressure bearing capacity, light weight, flexible opening and closing and long service life. Pneumatic shield gates are prone to rust sometimes. So what are the main factors causing their rusting?
Six Major Factors Leading to Corrosion of Pneumatic Shield Gates
Climatic factors: The above-water parts of pneumatic shield gates are highly susceptible to corrosion caused by sun exposure, rain erosion and humid weather.
Water quality: Seawater has high salinity and good electrical conductivity. A large number of chloride ions contained in seawater are extremely corrosive to steel, so pneumatic shield gates corrode more severely in seawater than in fresh water.

 

 

3. Stress and deformation: The greater the stress and deformation, the more serious the corrosion. 

4. Stray current: As a result of stray current, various degrees of corrosion often occur in the anode region of stray structure. The greater the stray current, the more serious the corrosion. Although the consequences of this corrosion are very serious, it has not yet attracted great attention from the industry. 

5. the surface condition of steel structure, that is, roughness, mechanical damage, holes, welding defects, cracks and other problems have great influence on corrosion. 

6. Galvanic corrosion: The whole air shield brake and parts made of various materials will form dissimilar metal connections in humid environment and medium, which will lead to serious galvanic corrosion.