Dissimilar Metals Corrosion Reference

Study setup

Inputs

Pick a preset, then adjust exposure and protection.

1Material Pair

Common assembly preset

Seeds typical materials and assumptions.

Primary component metal

Connected hardware metal

Metal role note

The tool identifies the anodic member automatically from galvanic potential. The metal lists include tray metals, base metals, lug platings, terminal platings, and hardware alloys.

2Environment & Geometry

Exposure environment

Electrolyte exposure duty cycle

Estimated anodic exposed area (cm²)

Estimated cathodic exposed area (cm²)

Role is auto-detected from the selected pair.

Operating temperature (°C)

3Protection Inputs

Electrical isolation quality

Available corrosion allowance (mm)

Initial component thickness (mm, optional)

Minimum acceptable thickness (mm, optional)

Optional: adds remaining-thickness projection.

Method and Engineering Context

Planning-level compatibility screen for electrically connected metals exposed to an electrolyte.

Driving potential = E(cathodic metal) - E(anodic metal)
Compatibility screen = compare driving potential with 0.25 V
Heuristic rate = relative planning model for comparing exposure and mitigation choices

Potential groups follow NASA-STD-6012A Table 1. The heuristic rate is not a measured corrosion rate or a qualified replacement interval.

Engineering basis · NASA-STD-6012A · MIL-STD-889D record

Reference

Interpretation Guide

< 0.01Negligible
0.01 ≤ r < 0.05Low
0.05 ≤ r < 0.20Moderate
0.20 ≤ r < 0.50High
≥ 0.50Severe