Dapeng Town Industrial Park, Tongshan District, Xuzhou City, Jiangsu Province, China
Space frame structure engineering often uses steel materials, which are prone to rust and corrosion due to the influence of coatings and natural environments. Here’s how to take effective anti-corrosion measures during the construction of large grid structures.
Causes of corrosion in large space frame structure engineering
1. Aging of Coatings:
No matter the material, aging is inevitable. This is also true for anti-corrosion coatings. The aging of these coatings leads to the failure of the protective layer on the steel structure, resulting in rust that affects its lifespan.
2. Environmental Factors:
If the environment around the steel structure is humid, the steel will gradually rust due to the erosion of water and air.
Therefore, for the maintenance of portal steel frame engineering, it is essential to be vigilant. Applying a protective film and reapplying anti-corrosion paint periodically can significantly extend the structure’s longevity.
Surface treatment of the steel structure is crucial. The same paint and corrosive environment can lead to different lifespans depending on the construction process used. It is important to remove any dirt and rust from the steel surface, particularly the black oxide scale formed during rolling, which is the cathode of electrochemical corrosion and the root cause of corrosion. Surface treatment quality should reach Sa2.5 level according to the pre-coating steel surface pretreatment specifications.
3. Material Selection:
Applying specialized anti-corrosion paint for steel structures remains the primary method for protecting steel and grid structures from corrosion. Anti-corrosion coatings for steel structures are divided into primer, intermediate paint, and topcoat, each with its characteristics and responsibilities. Combining these layers forms a composite coating, enhancing anti-corrosion performance and extending service life.
4.Coating Thickness:
The coating is an intermediate material for corrosion protection, forming a protective layer upon application. Uneven coating thickness can expose burrs or anchor peaks on the steel surface. Insufficient coating layers can result in pinholes, allowing oxygen, chloride ions, and water molecules to penetrate these weak spots, causing rust and corrosion. The volume expansion of corrosion products forms rust blisters, gradually enlarging and eventually causing the coating to bubble and fall off.
