OBJECTIVE
Structures suffering from widespread chloride contamination and corrosion benefit from the use of cathodic protection. Cathodic protection and electrochemical systems such as galvanic, impressed current and electrochemical chloride extraction / re-alkalization systems supply direct current to the reinforcing steel to counteract corrosion activity
Effect of Cathodic Protection: current imposed on a structure is to shift its potential more negative (called polarization)
The potential is measured with respect to a reference electrode (called the pipe-to-soil potential)
- Principles of Cathodic Protection
- Cathodic Protection Systems
- Typical Galvanic Anode System in Soil
- Typical Impressed Current System in Soil
- Effect of Cathodic Protection
- Measurement of Pipe Potential
- Overprotection
- Cathodic Protection & Operating Criteria
- Advantages and Deasadvantage of Cathodic Protection using Sacrificial Anodes
- Advantages and Desadvantages of Impressed Current
Too much cathodic protection can lead to overprotection. This can result in:
- Cathodic disbonding of coatings
- Hydrogen charging of steels leading to hydrogen embrittlement.
Also the course discusses Stray Current
Where does Stray Current Come From?
- Cathodic protection systems
- Induced a.c. currents from overhead power lines
- Welding currents
- Telluric currents
- d.c.
Course Features
- Lectures 0
- Quizzes 0
- Duration 50 hours
- Skill level All levels
- Language English
- Students 0
- Assessments Yes
Curriculum is empty
