| Metal | Volts |
|---|
| Commercially pure magnesium | -1.75 | | Magnesium alloy (6% AL, 3% An, 0.15% Mn) | -1.6 | | Zinc | -1.1 | | 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 | | Lead | -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. |
