5052-H32 Aluminum Alloy: Marine-Grade Corrosion Resistant Sheet Metal Guide

ASTM B209 / AMS 4016 · Published: 2026-06-01 · Updated: 2026-06-02

5052 is an aluminum-magnesium alloy (2.2-2.8% Mg, 0.15-0.35% Cr) optimized for corrosion resistance rather than strength — it is the highest-strength non-heat-treatable aluminum alloy with excellent marine atmospheric corrosion resistance. The magnesium in solid solution provides modest solid-solution strengthening (cannot be precipitation hardened — 5052 is non-heat-treatable); the chromium refines grain structure and improves stress corrosion cracking resistance. H32 temper (strain hardened and stabilized — 1/4 hard) is the standard for sheet metal forming applications, providing an optimal balance between formability and strength.

5052-H32 is the standard material for marine fuel tanks, boat hulls, chemical storage tanks, electronic chassis, appliance panels, highway signs, and architectural sheet metal in coastal environments. Its salt spray corrosion resistance (ASTM B117, 1,000+ hours without pitting) qualifies it for marine and coastal use without protective coating. Weldability: excellent with both GTAW (TIG) and GMAW (MIG) using 5356 filler rod. Heat-affected zone (HAZ) strength loss is minimal because 5052 is non-heat-treatable — there are no precipitates to dissolve during welding. For applications requiring higher strength with similar corrosion resistance, 5083-H321 (4.0-4.9% Mg) provides approximately 30% higher yield strength while maintaining excellent marine corrosion resistance.

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