NEWS

In projects such as outdoor infrastructure, power transmission towers, and port facilities that are exposed to high salt 

spray and humid environments for extended periods, the anti-corrosion performance of steel directly determines the 

project's lifespan and maintenance costs. Hot-dip galvanizing, with its ultra-high adhesion and superior corrosion 

resistance, has become the mainstream choice for steel corrosion protection worldwide, extending the service life of 

ordinary steel from 5-8 years to over 30 years.

I. The Core Principle of Hot-Dip Galvanizing: Zinc Layer Provides Double Protection

Hot-dip galvanizing involves immersing rust-removed steel into molten zinc at approximately 450℃. Through a 

combination of physical and chemical processes, three dense protective layers are formed on the steel surface:

Zinc-iron alloy layer: Closely bonded to the steel substrate, this layer has a stable structure and high hardness, 

effectively resisting external scratching;

Pure zinc layer: Covering the alloy layer, this layer provides excellent electrochemical protection. Even if the 

coating is partially damaged, it can protect the steel from corrosion through the "sacrificial anode" effect;

Oxide layer: The pure zinc layer exposed to the air naturally forms an oxide film, further enhancing weather resistance.

Compared to traditional painting processes, hot-dip galvanizing coatings have an adhesion of ≥5MPa, can withstand 

salt spray tests for over 2000 hours without corrosion, and require less frequent maintenance, significantly reducing 

long-term maintenance costs.

II. Core Application Scenarios of Hot-Dip Galvanized Steel

The hot-dip galvanizing anti-corrosion process is perfectly suited for high-corrosion-risk projects and is the preferred 

solution in the following areas:

Outdoor infrastructure: Cross-sea bridges, highway guardrails, municipal street light poles, resistant to rainwater erosion 

and temperature changes;

Power and communication: Power transmission towers, communication base station brackets, suitable for complex 

environments such as mountainous and coastal areas;

Ports and docks: Container yards, port machinery components, resistant to seawater salt spray corrosion.

Our hot-dip galvanized steel has been successfully applied to a port expansion project in Vietnam. After 3 years of seawater 

immersion, the coating integrity rate reached 98%, far exceeding the project design standards.

 III. Our Hot-Dip Galvanizing Service Advantages

Comprehensive Quality Control: Steel is descaled using shot blasting, achieving a surface cleanliness of Sa2.5, ensuring 

excellent zinc layer adhesion;

Customized Thickness: Zinc layer thickness can be customized according to project requirements (60-120μm), meeting 

the demands of different corrosive environments;

Compliance and Certification: Our products are certified to international standards such as ASTM A123 and ISO 1461, 

eliminating the need for additional testing when exporting to the EU and Southeast Asia.