Saltwater. Acid.
Chemical attack.
Material protection.
Corrosion resistance reference. Material rankings, mechanisms (galvanic, pitting, crevice), protection methods (coatings, plating, passivation).
Key principles.
General marine
Standard marine corrosion resistance.
Severe service
2× 316L strength. Severe marine.
Saltwater + HF
Highest saltwater immersion. HF acid resistance.
Strong acids
Premium acid-resistant alloy.
Chlorides
Excellent saltwater. Chemical industry.
Sacrificial
Zinc plating, galvanizing for steel protection.
FAQ
Galvanic corrosion?
Dissimilar metals + electrolyte. Use compatible metals or insulate.
Pitting corrosion?
Localized deep pits in stainless from chlorides. Higher PRE alloys resist.
Crevice corrosion?
Stagnant fluid in tight gaps. Avoid crevices in design.
Specifying corrosion resistance?
Specify chemical, concentration, temperature, exposure. Manufacturer recommends material.
Surface finish affects?
Polished/passivated surfaces resist corrosion better than rough.
Testing methods?
ASTM G corrosion test methods. Salt spray (ASTM B117) most common.