Galvanic / Corrosion Series Lookup implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t7-024

Effect

Computation or source lookup only

Input and validation requirements

The specification does not provide an actual galvanic-series table, a numerical risk threshold, or a signed-potential convention. Therefore exact lookup potentials and the corrosion-risk flag are not uniquely determined from the specification alone. A further implementation hazard is that reversing metal input order could incorrectly reverse the physical anodic/cathodic result if signed separation is treated as directional rather than using the lower-potential metal as anodic.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "metal_1": "Zinc",
    "metal_2": "Copper",
    "electrolyte": "aerated seawater",
    "temperature_C": 25
  },
  "expected_outputs": {
    "relative_position": {
      "zinc": "more active / less noble",
      "copper": "more noble"
    },
    "potential_separation_V": 0.83,
    "anodic_sacrificial_metal": "zinc",
    "corrosion_risk_flag": "high qualitative galvanic separation; zinc is expected to corrode preferentially when coupled"
  },
  "reference_data": {
    "zinc_galvanic_potential_V_vs_SCE": -1.03,
    "copper_galvanic_potential_V_vs_SCE": -0.2,
    "source_convention": "widely tabulated standard galvanic-series values for aerated seawater near 25 °C, representative point values; ASM Handbook / MIL-STD-889 convention"
  },
  "working": "Zinc: E = -1.03 V vs SCE. Copper: E = -0.20 V vs SCE. Separation = |-1.03 - (-0.20)| = |-0.83| = 0.83 V. Since -1.03 V is more negative than -0.20 V, zinc is the anodic sacrificial metal and copper is more noble."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche7/tranche7-results.json