Page 94 - Corrosion Engineering Principles and Practice
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68 C h a p t e r 4 C o r r o s i o n T h e r m o d y n a m i c s 69
Pure copper rod
(Electrolytic copper)
Insulating seal
Inert container
Copper sulfate
(Plastic) saturated solution
Surplus copper sulfate
crystals
Porous plug
(Wood or ceramic)
Ground surface
FIGURE 4.5 Schematic of a copper/copper sulfate reference electrode.
For Cu in a saturated Cu/CuSO solution, this equilibrium is
4
influenced modestly by temperature and not at all by other factors
except for light. Therefore, this reference electrode has a relatively
constant half-cell potential, making it reliable for field potential
measurements.
FIGURE 4.6 Commercial copper/copper sulfate reference electrode.
(Photo Courtesy of Tinker & Rasor)
