Why Can Hollow Iron Corrode from the Inside?

Hollow steel is widely used in various construction projects, such as ceiling frames, canopies, fences, and even light building frames. Although it appears strong from the outside, in some cases, hollow steel can experience internal corrosion, which often goes unnoticed until the damage is severe. This condition certainly compromises the strength of the structure.

So, what causes hollow steel to corrode internally? Here's the explanation.

1. Moisture and Trapped Water
Hollow steel is hollow. If water or moisture enters and cannot escape, this will result in:

• Condensation
• Water buildup within the cavity
• Interior rusting

This often occurs in outdoor hollow steel without a drainage system.

2. Low Material Quality
Hollow steel with low quality typically has:

• Inconsistent thickness
• Non-standard carbon content
• Minimal surface protection

This type of material oxidizes more quickly, even before it can be used.

3. Uneven Galvanized Coating
In galvanized hollow steel, the zinc layer acts as a protective barrier against rust. However, if the galvanization process is not perfect:

• The interior of the hollow steel is not optimally protected
• The zinc erodes quickly
• The steel inside rusts easily
• This is why cheap galvanized hollow steel often corrodes quickly.

4. Incorrect Cutting and Welding Processes
Cutting and welding can remove the protective layer of hollow steel. If additional protection is not provided:

• The joint area becomes a point of entry for water
• Rust spreads to the interior
• Corrosion occurs more quickly

5. Lack of Finishing or Additional Protection
Black hollow steel without paint or coating is highly susceptible to rust, especially:

• In humid areas
• Exposed to rain and open air
• Without additional protection, external corrosion will spread into the cavity.

6. Material Storage Incorrect Storage
Storage in a warehouse that is:

• Damp
• Lacks ventilation
• Direct contact with the ground

can cause rust to appear even before the material is installed.

How to Prevent Hollow Iron from Corroding from the Inside
Some preventative measures you can take:

• Choose hollow iron with standard quality and thickness
• Use galvanized or galvalume hollow iron for outdoor areas
• Cover the ends of the hollow iron to prevent water from entering

Apply additional painting or coating

Ensure material storage is dry and covered

Conclusion
Hollow iron can corrode from the inside due to a combination of humidity, low-quality materials, imperfect coating, and incorrect installation and maintenance. By choosing quality products and proper treatment, the risk of corrosion can be significantly minimized.

Need High-Quality, Durable Hollow Iron?
PT Intisumber Bajasakti (ISBS) provides galvanized and black hollow iron with guaranteed quality standards, suitable for various construction project needs.

📞 Phone: 021-66675999
🌐 Website: intisumberbajasakti.com
✉️ Email: info@intisumberbajasakti.com

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