Foundations of Cathodic Protection

What this pathway is

This level builds the mental models behind cathodic protection measurements and criteria. The goal is conceptual clarity: how charge moves, where voltage is lost, what changes at the metal surface, and why field readings can be misleading when you mix surface effects with circuit resistance.

Progression (recommended order)

1. Current and circuit completion
   Electron path in metal + ion path in electrolyte; what “closed circuit” means in CP.
2. Voltage and potential
   Driving voltage vs measured potential; reference points, sign conventions, and what a meter can actually tell you.
3. Polarization
   Surface potential shift caused by changing reaction rates; why “more negative” is not the whole story.
4. IR drop
   Voltage loss in the electrolyte and resistive paths; how it distorts structure-to-electrolyte readings.
5. Attenuation
   How potential and current decay with distance; why remote structures behave differently than near-rectifier locations.
6. Measurement interpretation
   Instant-off logic, meter loading, contact errors, and what makes a “good” field reading.

Next step

Once the concepts above are stable, move into the certification progression. Level 2 maps resources to CP1–CP4 scope boundaries.