Cathodic protection standards
NACE International's Corrosion Control of Submerged Areas of Permanently
Installed Steel Offshore Structures (SP0176-2007)

Reference Electrode

Protection Standard

Saturated CSE Electrode

-850mv or more negative between -1200mv

Ag/AgCl (Seawater)

-750mv or more negative between -1100mv

Ag/AgCl (Saturated KCl)

-760mv or more negative between -1110mv

SCE Electrode

-780mv or more negative between 1130mv

High-Purity Zinc Electrode

+250mv or less positive


NACE International's Control of External Corrosion on Underground or

Submerged Metallic Piping Systems (SP0169-2007)



Protection Standard

ON Potential (under CP)

-850 mv or more negative between -1200mv

(Using CSE reference electrode)

OFF Potential (Polarized Structure Potential)

-850 mv or more negative between -1200mv

(Using CSE reference electrode)

A minimum of 100 mV of cathodic

polarization between the structure surface

and a stable reference electrode contacting

the electrolyte.

Different type of reference electrode

Special Cases:

1.Standards may differ when Sulfide, Anaerobic Bacteria,

high temperature and low PH soil are present

2.Standards may differ in cement wrapped pipe, pipes in dry or aerated soil

Do contact us for further enquiry

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  550k v. 1 Aug 25, 2011, 6:22 PM Grant Wang