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Cathodic Protection Current Density

Typical cathodic-protection current-density requirement for uncoated vs coated steel in sea water per DNV-RP-B401.

HullCP
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Formula, assumptions, and limits

I=iuncoatedAuncoated+icoatedfbAcoatedI = i_\text{uncoated} \cdot A_\text{uncoated} + i_\text{coated} \cdot f_b \cdot A_\text{coated}
SymbolMeaningUnit
iiCurrent density per m²mA/m²
fbf_bCoating breakdown factor
AASubmerged area

Source: DNV-RP-B401 - CP design

In short

Typical cathodic-protection current-density requirement for uncoated vs coated steel in sea water per DNV-RP-B401.

Learn the theory Marine Cathodic Protection and Hull Coatings