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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47

MIL-STD-1250A

Table III. Galvanic couples.

EMF

Group Metallurgical Cagetory (Volt) permissible Couples*

1 Gold, solid and plated; gold- +0.15 platinum alloys; wrought platinum

2 Rhodium; graphite +0.05

3 Silver, solid or plated; high silver alloy s o

4 Nickel, solid or plated; monel; high -0.1 5 nickel-copper alloys; titaniu m

5 Copper, solid or plated; low brasses or -0.2 0

17 Zinc wrought; zinc-base die cast -1.1 0 alloys; zinc, plate d

18 Magnesium and magnesium-base alloys cast or -1.60 wrought

* Members of groups connected by lines are considered as permissible couples; however, thi s should not be construed as being devoid of galvanic action. Permissible couples represent a low galvanic effect.

0 Indicates the most cathodic member of the series. An anodic member, and the arrows indicate

the anodic direction. Refer to Table XI, MIL-STD-186, for group amplification of galvanic couples.