Nace CP 1 - Experiment 2.3 Current Direction in the Electrolyte in Corrosion Cells

Basic Chemistry and Basic Corrosion Theory 2:35
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
02/01/05
Experiment 2.3 Current Direction in the Electrolyte
in Corrosion Cells
Experiment for Measuring the Direction of Corrosion-Cell
Currents in the Electrolyte
PROCEDURE
1. Place the zinc and copper at the sides of the tray.
2. Add 1-1/2 inch of tap water to the tray.
3. Set the meter to the V DC scale.
4. Connect the meter to the zinc and to the reference electrode as indicated in
the figure .
5. Record the electrode potential with the reference electrode in the two
positions indicated in the figure.
6. Evaluate the direction of current.
V
+
–
Reference
electrode
Position No. 1
Reference
electrode
Position No. 2
Tap water in tray
Zinc sheet
Copper sheet
100 Ω