Galvanic Compatibility Chart

Considerations when selecting materials

When selecting metals, make sure to group “like” metals together because when they are in harsh environments, corrosion may occur. The more corrosion, the less these products perform, and shielding decreases over time.

See the figure below to determine the most compatible metals.

Anodic
Most susceptible to corrosion
Cathodic
Least susceptible to corrosion
Magnesium
Zinc
Aluminum
Cadmium
Tin
Iron, Steel
Chromium
Brass
Copper, Bronze
Nickel, Monel
Stainless Steel
Zinc 0.50
Aluminim 0.85 0.35
Cadmium 0.80 0.30 0.05
Tin 1.10 0.60 0.25 0.30
Iron, Steel 0.90 0.40 0.05 0.10 0.20
Chromium 1.15 0.65 0.30 0.35 0.05 0.25
Brass 1.30 0.80 0.45 0.50 0.20 0.40 0.15
Copper, Bronze 1.40 0.90 0.55 0.60 0.30 0.50 0.25 0.10
Nickel, Monel 1.45 0.95 0.60 0.65 0.35 0.55 0.30 0.15 0.05
Stainless Steel 1.40 0.90 0.55 0.60 0.30 0.50 0.25 0.10 0.02 0.05
Silver 1.60 1.10 0.75 0.80 0.50 0.70 0.45 0.30 0.20 0.15 0.20
  1. RED – Metals subjected to harsh, marine environments such as salt spray or salt water. The potential difference is to be equal or less than 0.15V.
  2. GREEN – Metals subjected to normal environments, without temperature or humidity control such as warehouse storage. The potential difference is to be less than 0.45V.
  3. BLUE – Metals subjected to controlled environments with temperature / humidity control. The potential difference is to be equal or less than 0.95V.
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