Name of technique
Cathodic protection
Use
- Prevent corrosion
- Complement protection given by coatings
Definition
- A technique where an ionic current towards the structure from the electrolyte is used to counter the corrosion current flowing out of the structure.
CP criteria
- CP potential of -850 mV vs. CSE
- An instant off potential of at least -850 mV vs CSE
- A minimum 100 mV polarization post instant off
CP measurement techniques
- Soil resistivity
- CIPS
- DCVG
- Line current
Factors affecting CP requirements
- pH
- velocity
- ionic type
- ionic concentration
- temperature
Issues with CP
- Stray current corrosion
- Insufficient CP potential
- Insufficient CP current
- Electrical shorting
I will discuss all these with examples in this major course, where you can prepare for the basics for your certification course!
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