MIL-HDBK-1138
Table 12
Practical Galvanic Series of Metals
Platinum
CATHODIC
Gold
Graphite
Titanium
Silver
Stainless steel (passive)
Nickel (passive)
Copper and its alloys
Tin
Lead
Steel or iron
Aluminum alloys
Zinc
Magnesium alloys
ANODIC
Galvanic corrosion is commonly found in WWTPs.
Control
galvanic corrosion using the following procedures:
a)
Select materials that are close together in the
galvanic series.
b)
Electrically isolate the two metals from each
other by installing insulating flanges or unions.
c)
Maintain a large surface area of the anodic metal
compared with the surface area of the cathodic metal.
d)
Paint the metals to reduce the surface areas
exposed. It is preferable to paint the cathode to maintain a
large surface area of the anode metal.
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