MIL-STD-186 Protective Finishing For Army Missile Weapon SystemsThis standard establishes the minimum requirements for procedures, materials, and systems for cleaning, plating, painting and finishing metals, wood, electronic materials, parts and assemblies for rockets, guided missiles, and components to protect them from deterioration.

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MIL-STD-186F (MI)

TABLE IX. Galvanic couples. - Continued.

Grou p No.	Metallurgical category	E.M.F. (Volt)	Permissible couples*
15	Aluminum, cast alloys other than silicon type; cadmium, plated and chromated	-0.80
			o
16	Hot-dip-zinc plate; galvanized steel	-1.05
			o
17	Zinc, wrought; zinc-base die-casting alloys; zinc, plated	-1.10

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

* Members of groups connected by lines are considered as permissible couples; however, this 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, 0 an anodic member, and the arrows the anodic direction.

Permissible couples are based on 0.10 E.M.F. (Volt) limitation except groups 2,

3, 4, 14, 15, and 16.

All stainless steels for use in missile systems are required to be passivated. All stainless steels within this table are passivated.