UFC 3-570-06
JANUARY 31 2003
(40.2 pounds) of steel in one year. For a coated pipeline, this could result in a
penetration at a defect in the coating in an extremely short period of time, sometimes
only a few days.
Table 2-1. Weight Loss of Specific Metals at a Current of One Ampere for One
Year (1 Amp-Year)
METAL
WEIGHT
WEIGHT LOSS
LOSS
(POUNDS)
(ION)
(KILOGRAMS)
Magnesium
4.00
8.8
Aluminum
2.95
6.5
Zinc (Zn++)
10.66
23.6
5.65
12.5
Cadmium
18.39
40.5
Iron (Fe++)
9.13
20.1
Cobalt
9.63
21.2
Nickel
9.58
21.1
Copper (Cu+)
20.77
45.6
Copper (Cu++)
10.39
22.8
Tin
19.39
42.7
Lead (Pb++)
33.87
74.5
Carbon (C+)
1.91
4.2
Carbon (C++++)
1.00
2.2
2-2.4.1
DC Transit Systems. Electrified railroads, subway systems, street railway
systems, mining systems, and trolleys that operate on DC are major sources of stray
current corrosion. These systems may operate load currents of thousands of amperes at
a common operating potential of 600 volts. Tracks are laid at ground level and are not
2-16
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