Corrosion Resistance of Aluminum Extruded Products

Corrosion Resistance Mechanism of Aluminum Extruded Products

Aluminum extrusion products (such as seamless extruded aluminum tubes and rods) are favored in many industries for their excellent corrosion resistance. The core of this lies in the naturally formed aluminum oxide (Al₂O₃) film on the surface of the aluminum, a dense protective layer that effectively blocks oxygen and moisture erosion and prevents further oxidation. Southwest Aluminum (Kunshan) Co., Ltd. produces high-quality aluminum extrusions through 12 extrusion lines ranging from 500-8,000 tons, combined with alloy optimization (e.g., magnesium-silicon added to the 6xxx series), to further enhance corrosion resistance and comply with AMS and ASTM standards.

Key factors for corrosion resistance

The corrosion resistance of aluminum extrusion products is influenced by a number of factors:

Alloy composition: The addition of copper (e.g. 2xxx series) improves strength but slightly reduces corrosion resistance, while magnesium-silicon alloys (e.g. 6061) balance strength and corrosion resistance.

Surface Finish: Extrusion process ensures a clean surface and reduces the starting point for corrosion, while anodizing or coating can further enhance protection.

Environmental Adaptability: In harsh environments such as humidity and salt spray, the natural corrosion resistance of aluminum extrusions is superior to steel.

Southwest Aluminum optimizes product durability through T6 heat treatment and precision processes.

Application Scenarios and Advantages

The corrosion resistance of aluminum extrusions makes them excellent in construction (curtain wall piping), automotive (heat sinks) and electronics (device housings). In marine engineering, seamless extruded aluminum tubes resist seawater erosion, making them ideal for ship piping. New information shows that the global green building boom and the popularity of electric vehicles (7-8% annual growth) will push up the demand for corrosion-resistant aluminum by 2025, and the European Union's carbon border tax policy has prompted companies to opt for low-carbon and durable materials.

Market Prospects and Southwest Aluminum's Practices

With an annual capacity of 70,000 tons and ISO 14001 certification, Southwest Aluminum (Kunshan) produces corrosion-resistant aluminum extrusions to meet the market demand for sustainable materials. Its 24-hour customized service further supports customers in meeting specific environmental challenges. 2025, corrosion resistance will be the key to aluminum competition, and Southwest Aluminum is well positioned to capitalize on its technological advantages.

Summary

Aluminum extrusion products are widely used in construction, automotive and marine engineering due to their oxide film and alloy-optimized corrosion resistance. 2025 green trend, Southwest Aluminum meets buyers' needs and strengthens its position in the industry with its high-standard production and customization capabilities.