MIL-STD-193 Painting, Procedures And Marking For Vehicles, Construction Equipment, Material Handling Equipment, And Spare PartsThis standard establishes minimum requirements for materials to be used and procedures to be followed in surface preparation, surface treatment, plating and painting of vehicles, construction and material handling equipment, and markings so as to provide protection from the adverse effect of chemical and environmental conditions.

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MIL-STD-193L

TABLE VI Galvanic couples.

Group No.	Metallurgical Category	E.M.F. (Volt)	Permissible Couples 1/
1	Gold, solid and plated; gold-platinum alloys; wrought platinum	+0.05	○
2	Rhodium, graphite	+0.05	●○
3	Silver, solid or plated; high silver alloys	0	●●○
4	Nickel, solid or plated; monel metal; high nickel-copper alloys; titanium	-0.15	●●○
5	Copper, solid or plated; low brasses or bronzes; silver solder; German silver; high copper-nickel alloys; nickel-chromium alloys; austenitic stainless steels	-0.20	●●●○
6	Commercial yellow brasses and bronzes	-0.25	●●●○
7	High brasses and bronzes; Naval brass; Muntz metal	-0.30	●●●○
8	18% chromium type corrosion-resistant steels	-0.35	●●●●○
9	Chromium, plated; tin, plated; 12% chromium type corrosion-resistant steels	-0.45	●●●●○
10	Tin-plate; terneplate; tin-lead solders	-0.50	●●●●○
11	Lead, solid or plated; high lead alloys	-0.55	●●●●○
12	Aluminum; wrought alloys of the Duralumin type	-0.60	●●●●○
13	Iron, wrought, gray, or malleable; plain carbon and low alloy steels; Armco iron	-0.70	●●●●○
14	Aluminum; wrought alloys other than Duralumin type; aluminum, cast alloys of the silicon type	-0.75	●●●●○
15	Aluminum, cast alloys other than silicon type; cadmium, plated and chromated	-0.80	●●●●○
16	Hot-dip zinc plate; galvanized steel	-1.05	●○
17	Zinc, wrought; zinc-base die-casting alloys; zinc, plated	-1.10	●
18	Magnesium and magnesium-base alloys, cast or wrought	-1.60	●

1/ Members of groups connected by lines are considered as permissible couples. Permissible

couples represent a low galvanic effect. However, this should not be construed as being devoid of galvanic action. ○ indicates the most cathodic member of the series, ● an anodic member, and the arrows the anodic direction.