Dissimilar Metal Compatibility Matrix: G
R to T
Dissimilar metal compatibility matrix — required protective treatment level (1–9, where 1=maximum protection required and 9=minimal or no protection needed) for each pair of metal groups (A–T, anodic to noble) per MIL-STD-889C Table I. Covers three service environments: seawater, marine atmosphere, and industrial atmosphere. Also flags same-metal diagonal entries. Used to determine dissimilar metal joint protection requirements in aerospace, marine, and industrial structures. Complement table: Surface Treatment Specs (dissimilar_metal_protection_* PKs) lists the specific protective treatments corresponding to each protection level.
| metal a code | metal b code | borderline marine atm | borderline seawater | metal a name | metal b name | protection level industrial atm | protection level marine atm | protection level seawater | same metal compatible | standard |
|---|---|---|---|---|---|---|---|---|---|---|
| G | R | false | false | Tin/indium-lead | Silver | 5 | 3 | 2 | false | MIL-STD-889C Table I |
| G | S | false | false | Tin/indium-lead | Pd/Rh/Gold/Platinum | 5 | 3 | 2 | false | MIL-STD-889C Table I |
| G | T | false | false | Tin/indium-lead | Graphite | 5 | 3 | 2 | false | MIL-STD-889C Table I |
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