The constitution of current cathodic protection

The constitution of current cathodic protection, the factors of current cathodic protection, understanding current cathodic protection

As a common method of metal corrosion protection, forced current cathodic protection has attracted much attention. In the forced current cathodic protection, an auxiliary magnesium anode is embedded in the same electrolyte environment around the protected metal. Through the DC power supply, the auxiliary magnesium anode is used as the anode and the protected metal as the cathode to form a power supply loop and protect the metal. So, you know the structure of a forced current cathodic protection system and the structure of a cathodic protection system

1: anode ground bed

Anodic ground bed is generally divided into shallow buried anodic ground bed and deep well anodic ground bed.

Cathodic protection system composition

2: Cathodic protection

If the pipeline is under construction for more than 6 months, install a temporary cathodic protection system to protect against previous corrosion. Insulation joints are arranged at both ends of the long distance pipeline to ensure that the cathodic protection current does not leak to the unprotected metal part

Potentiostat, control box, anode ground bed and cathode galvanic point constitute the control system of cathodic protection.

In the parallel section between long distance transmission pipeline and high voltage transmission line or cross parallel section with electrified railway, the discharge anode group is set according to the influence of stray current to form the discharge system of cathodic protection.

Potentiostat and pipeline test pile constitute the cathodic protection testing system. Here the role of the potentiostat is mainly: automatic measurement of galvanic point potential, potentiostat working potential and output current; Pipeline test pile detection: pipeline protection potential and sacrifice anode working potential, output current, open circuit potential

Cathodic protection system composition

3: Cathodic protection of pipes in the casing In order to ensure that the pipes in the casing are not corroded within the design life, magnesium anode must be used for cathodic protection