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MIL-STD-889D Chart
This standard defines and classifies galvanic compatibility of electrically
conductive materials and establishes requirements for protecting electrically conductive
materials in a dissimilar couple against galvanic corrosion.
Data collected in this standard was completed in static, immersion conditions in artificial seawater in accordance with ASTM D1141 (without heavy metals).
Data collected in this standard was completed in static, immersion conditions in artificial seawater in accordance with ASTM D1141 (without heavy metals).
Corrosion Severity
This table should not be used to indicate the level of risk associated with the galvanic couple nor should it be used to determine the level of protection required to protect the
conductive materials. The CEA or appropriate design authority will determine the necessary protection. The corrosion rate was determined for conductive materials in a 1:1
surface area ratio.
The number in the cells represent a range at which the anodic material will corrode when coupled with the cathodic material in artificial seawater. Any number above zero indicates galvanic incompatibility. The range of the corrosion rate in mil/year is as follows:
| Rating | Galvanic Corrosion Rate (Mil/Year) |
|---|---|
| 0 | Less than 0.09 mil/year |
| 1 | 0.01 - 0.09 mil/year |
| 2 | 0.1 - 0.9 mil/year |
| 3 | 1 - 4.99 mil/year |
| 4 | 5 - 9.99 mil/year |
| 5 | 10 - 99.99 mil/year |
| 6 | Greater than 100 mil/year |