MIL-STD-1250 Corrosion Prevention And Deterioration Control In Electronic Components And Assemblies S/S By Mil-Hdbk-1250This standard establishes minimum requirements for procedures, materials and systems for protecting electronic components in DoD systems and assemblies from adverse environments. Protective measures shall be sufficient to maintain performance characteristics within specified limits both during and after exposure to moisture, high and low temperatures, corrosive gases, chemicals and microbial fungal attack.

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MIL-STD-1250A

3.9  Galvanic series.  A ranking of metals in accordance with their relative anodic and cathodic position determined in some specific electrolyte as defined in table III.

3.10  Hermetic seal.  An impervious seal made by the fusion of metals or ceramic materials (as by brazing, soldering, welding, fusing glass or ceramic) which prevents the passage of gas or moisture.

3.11  Purple plague.  A brittle, gold-aluminum compound formed in the presence of silicon.

3.12  Red plague.  A copper oxide corrosion product formed on silver plate-over- copper at pinholes or breaks in the silver plate.

3.13  Stress corrosion.  A specific type of accelerated corrosion resulting from the combined effects of mechanical tensile stress and corrosive environments.

3.14  Vapor (or Volatile) corrosion inhibitor.  A chemical which vaporizes and condenses on nearby surfaces, retarding corrosion from moisture.

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