What are the best corrosion protection strategies for steel structures in tropical coastal regions?

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 In Southeast Asia, particularly in coastal cities such as Surabaya, Da Nang and Johor Bahru, steel buildings must withstand high humidity, salty air and heavy rainfall. To prevent premature deterioration of spaceframe steel structures, contractors must adopt a comprehensive corrosion prevention strategy.

Recommended Technology:

Hot Dip Galvanising (HDG):

Coats steel members with a protective coating of zinc. Widely used for pre-engineered steel buildings near the coast. Provides greater than 25 years corrosion resistance in tropical conditions.


Zinc Epoxy Primer + Polyurethane Top Coat:

A two-coat system ideal for industrial steel roofing systems and exposed steel columns. Commonly used in logistics centres in the Philippines.

Uses weathering steel (e.g. Q355NH):

Forms a stable oxide layer to protect the steel beneath. Suitable for building space frames with minimal maintenance requirements.

Sealing of bolted and welded nodes:

Prevents salt water penetration. Use silicone-based sealants and stainless steel bolts in highly exposed areas.

Interested in best practices for long-term durability of steel structures in high humidity areas? Click for more details

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