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Automatic
recording of OCP
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Files:
Open Circuit Potential.EXP
Open Circuit Potential 1.CRV
Abstract
Record the Open Circuit Potential of 316L stainless
steel with temperature evolution from 0°C to 80 °C.
Sample
SolutionNaCl 3g/l in water
WORK: Stainless steel disc
EM/EDI/INOX AISI 316L:
(C<0.03%,Cr=17%,Ni=12%,Mo>2%)
{EDI101 Rotating disc electrode and CTV101 Speed control unit for
EDI101}
REF: Calomel electrode XR100
AUX: Platinum wire XM100
A/D IN: Temperature in °C (T201)
CP06 Thermostated cell
Potential = OCP = WORK -REF
Settings - Experimental
Rotating disc electrode at 500 rpm. Temperature
is maintained with a bath flow circulation. A digital thermometer
with analogue output is used.
Curve examination
1) Display:
Type = Normal X= A/D IN (Temperature) Y1 = potential Y2 = No
2) Display:
Type = Normal X= Time Y1 = potential Y2 = A/D IN (Temperature)
From 0°C up to 40°C, the OCP
varies. It becomes stable and exhibits a smooth maximum around 80°C.
Conclusion
Thermodynamically,the less negative the
OCP the more sensitive to corrosion the sample is.
Note:
A relevant method to investigate stainless steel corrosion behaviour
is to run Pitting corrosion test.
Consult Pitting corrosion.EXP.
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