Short answer: Corrosion destroys more metal than anything else. Stainless steel, aluminum, titanium, copper, and galvanized steel each resist different environments. Match the metal to the exposure – chlorides, acids, alkalis, or atmosphere – to maximize service life and minimize cost.
At a Glance
The Main Corrosion Environments
Most failures trace to one of four exposures: atmospheric (rain, pollution), chloride (seawater, de-icing salts), acidic or alkaline process streams, and high-temperature oxidation. A metal that is perfect in one can fail fast in another, so selection starts with the environment, not the price.
How Each Metal Resists Corrosion
The chart maps the leaders. Stainless 316 et titanium dominate chlorides; aluminium et galvanized steel are cost-effective in atmosphere; cuivre resists many waters and soils; nickel alloys handle the harshest acids. Stainless supply, aluminum supplyet galvanized steel cover most cases.
Coatings and Alloying
Where the base metal is weak, a coating helps: zinc (galvanizing) protects steel atmospherically; anodizing hardens aluminum’s film; alloying (molybdenum in 316, palladium in Gr7 titanium) extends resistance. Choose the system that matches design life and exposure.
Choosing the Right Metal
Start from the worst condition the part will see, then pick the least-cost metal that survives it with margin. Tell HXSCO the environment, temperature, and media and we will recommend grade, coating, and certification.
Questions fréquemment posées
Titanium and 316/duplex stainless resist seawater best; aluminum 5xxx is good for hulls; copper alloys also serve marine duty.
No. Standard 304 can pit in chlorides; 316 and duplex resist seawater far better. Even stainless can fail in the wrong environment.
Aluminum resists atmosphere and many waters via its oxide film, but can corrode in strong acids/alkalis or galvanically against dissimilar metals.
Zinc corrodes first (sacrificial/cathodic protection) and forms a barrier, giving decades of maintenance-free atmospheric life.
Identify the worst exposure (chloride, acid, alkali, temperature), then pick the lowest-cost metal that survives it with margin.
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