|Commercially pure magnesium||-1.75|
|Magnesium alloy (6% AL, 3% An, 0.15% Mn)||-1.6|
|Aluminum alloy (5% zinc)||-1.05|
|Commercially pure aluminum||-0.8|
|Mild steel (clean & shiny)||-0.5 to -0.8|
|Mild steel (rusted)||-0.2 to -0.5|
|Cast Iron (not graphitized)||-0.5|
|Mild steel in concrete||-0.2|
|Copper, brass, bronze||-0.2|
|High silcon cast iron||-0.2|
|Mill scale on steel||-0.2|
|Carbon, graphite, coke||+0.3|
Typical potential normally observed in neutral soils and water, measured with respect to copper/copper sulfate reference electrode.
Copyright © 1991 by NACE International. Reprinted from Corrosion Engineers Reference Book with permission by NACE. All rights reserved.