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Reference · Corrosion Resistance

Saltwater. Acid.
Chemical attack.
Material protection.

Corrosion resistance reference. Material rankings, mechanisms (galvanic, pitting, crevice), protection methods (coatings, plating, passivation).

01 · Key principles

Key principles.

316L stainless

General marine

Standard marine corrosion resistance.

Duplex 2205

Severe service

2× 316L strength. Severe marine.

Monel 400

Saltwater + HF

Highest saltwater immersion. HF acid resistance.

Hastelloy C-276

Strong acids

Premium acid-resistant alloy.

Titanium

Chlorides

Excellent saltwater. Chemical industry.

Coatings

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.

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