What is current density in cathodic protection?

A critical part of design calculations for cathodic protection. systems on existing structures is the amount of current required per square foot (called. current density) to change the structure’s potential to -0.85 volt. The current density required to shift the potential indicates the structure’s surface condition.

Is cathodic protection required for stainless steel?

Cathodic protection of stainless steel can be obtained at far more positive potentials than carbon steel. A side effect of this is that the cathodic current density requirement of stainless steel is normally less than 5 % of that for carbon steel. There are several options for cathodic protection of stainless steel.

How do you find the current density of anode?

current density in cathode = current / A2. The current density in the electrolyte with the above assumption is a function of the varying cross section of the electrolyte, between the surfaces of anode and cathode.

How much current is needed for cathodic protection?

The average current density required for cathodic protection is 2 milliamperes per square foot of bare area. The amount of current required for complete cathodic protection can be determined three ways:

How is cathodic protection used in stainless steel?

Cathodic Protection (CP) systems are therefore utilized to protect the submerged sections of these screens with the aim of extending the life of the stainless steel equipment.

What should the current density of a coating be?

Due to good electrical resistance, the coating needs low cathodic protection current (see Table 6.1). The recommended design current density for 15 − 30 years of service life is 200 μA/m2 of the external pipe surface.

What is the polarization potential of a cathodic protection system?

The cathodic protection system shall be capable of polarizing all submerged steel of the installations to a potential between -800 mV and -1050 mV vs the Ag/AgCl/seawater reference electrode, and to maintain the potential in this interval throughout the design life of the installations..