The pH of environment in concrete usually is greater than 12.5, which causes a passive film on the surface of embedded steel reinforcement. However, this protective film breaks down when concrete reacts with atmospheric carbon dioxide or chloride ions (present in aggressive environments such as seawater or de-icing salt) penetrate into the hardened concrete and reach the surface of reinforcing steel. Corrosion products cause expansive stresses in the concrete which leads to cracking and spalling.
Cathodic protection (C.P.) is a well-accepted technology for the corrosion prevention of the reinforcing steel in concrete.
Corrosion Service Company Limited has been providing a wide range of cathodic protection and rehabilitation services for the reinforced concrete structures such as bridges, buildings, parking garages, piers, and water facilities. We have more than 25 years of global experience with extensive work in North America and the Middle East.
Deteriorated structure
CP Installation
Rehabilitated structure after CP Installation
Our services include:
Preliminary survey
Design
Supply materials and rectifiers
Installation supervision
Commissioning
Operation and maintenance of cathodic protection systemss
Cathodic protection systems for reinforced concrete:
1. Conductive Coating Systems
Primary Distributor (Pt Nb or Ti)
Conductive Coating
Decorative Top
Traffic membrane
2. Continuous Titanium-Mixed Metal Oxide (MMO) anodes
Expended Mesh - Retrofit large areas with overlay
Ribbon – Retrofit with overlay and saw slot
New structures- Installed to rebar before connections
3. Probe anodes
Multiple Element Probe (MEP), capable of monitoring chloride/moisture ingress and corrosion of reinforcing steel
MMO tubes- For high density surface areas
Retrofit columns and beams
Traffic membrane
4. Arc Sprayed Zinc anodes
As sacrificial anodes
Used for impressed current
5. Sacrificial (Generally based on customer application) anodes
Hockey Puck-protects interface on patch repair
Encapsulation- For Piers
Zinc overlay
6. Other
Conductive Bituminous Overlay – No longer installed but some systems older than 20 years are still in working order
