UFC 3-570-06
JANUARY 31 2003
Table 2-2. Electrical Potential of Metals with Various Reference Cells
GALVANIC SERIES OF
SILVER/SILVER
SATURATED
COPPER/COPPE
METALS: METAL OR
CHLORIDE
CALOMEL
R SULFATE
ALLOY REFERENCE:
ELECTROLYTE
FLOWING
SEAWATER
NEUTRAL SOILS
SEAWATER
AND WATER
Pure Magnesium
-1.60 to -1.64
-1.75
Standard Magnesium
-1.55
Zinc
-0.98 to -1.04
-1.10
Aluminum Alloy
-0.79
-0.77 to -1.00
-1.05
Pure Aluminum
-0.80
Low-Carbon Steel
(clean -0.61
-0.60 to -0.72
-0.50 to -0.80
and shiny)
Low-Carbon Steel (rusted)
-0.20 to -0.50
Cast Iron (not
-0.61
-0.60 to -0.72
-0.50
graphitized)
Lead
-0.18 to -0.23
-0.50
Low-Carbon Steel
(in
-0.20
concrete)
Brass
Copper, Brass, Bronze
-0.36
-0.20
High-Silicon Cast Iron
-0.20
Mill Scale on Steel
-0.20
Carbon, Graphite, Coke
+0.25
+0.30
Note that there is a substantial difference between the potential of steel and all other
metals potentials. Steel varies greatly from clean and shiny to rusty (paragraph 2-2.3.2
and Figure 2-9).
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