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Cathodic Protection

Introduction of Cathodic Protection

Corrosion of steel reinforcement bar in concrete or steel structure is one of the fundamental contributions toward structure failure if not degradation of structural capacity. The introduction of cathodic protection (CP) was initially mean to stop or to reduce corrosion to an acceptable level.

Cathodic protection prevents corrosion by converting all of the anodic (active) sites on the metal surface to cathodic (passive) sites by supplying electrical current (or free electrons) from an alternate source.

There are two types of generally known CP method which are impressed current or self sacrificing anodes. Regardless, many have not known the efficiency of CP method which also related to cost where it is grade as luxury installation in preventing if not slowing down corrosion.

The installation of CP very much depends on the brands and methods which vary from each and another. As basic,

  • For Self sacrificing Anode type of CP, the installation is easier where the anode is connected to the intended protected rebar or entity. This is by drilling a hole to connect the anode to the rebar which is inside the concrete structure.
  • The more complicated system of Impressed Current has its own monitoring system or processing center where it will monitor the current. Some of the newer CP systems are integrated with connectivity (communication protocols) through internet and even telephone line.

Installed Self-sacrificial anodes at Port Liberty, Labuan

Installation and Design of a cathodic protection system

As part of the structure repair and rehabilitation, MCS is familiar with the available systems for various type of protection range and installation techniques. Therefore, MCS could assist in getting the appropriate system installers as well as specialized divers and crews shall there be any underwater SAW (submerge arc welding) needed.


Self-sacrificial Anode Inspection