Dissimilar Metal Compatibility Matrix: D
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 | notes | protection level industrial atm | protection level marine atm | protection level seawater | same metal compatible |
|---|---|---|---|---|---|---|---|---|---|---|
| D | E | false | false | Aluminum alloys | Carbon/low-alloy steel | Al-steel couple; significant in wet environments; standard aerospace dissimilar metal treatment | 5 | 3 | 2 | false |
| D | F | false | false | Aluminum alloys | Lead | Al anodic to Pb; moderate protection | 7 | 4 | 3 | false |
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