Electrochemical Corrosion control: Improving Structural Lifespan

By Author: Ivar
Total Articles: 148
Comment this article

The issue of corrosion of the reinforcement bars (rebar’s) in concrete structures is a significant problem in the construction industry. When exposed to moisture, chlorides, and environmental pollutants over time, rust forms, compromising the structural integrity of a bridge and shortening its life span. Electrochemical corrosion control is vital for long term durability, reduced maintenance costs and improved structural integrity.

Access Water: Understanding Electrochemical Corrosion Control

Electrochemical corrosion is categorized as a condition where steel rebars are in contact with electrolytes, which lead to oxidation and deterioration of metals. In places where moisture, chlorides, and pollutants are present, this process is accelerated. These methods are part of electrochemical corrosion control techniques, which may reduce the corrosion effects on concrete structures and increase their lifespan.

Electrochemical Corrosion Control Techniques

Some evolved methods can successfully protect against electrochemical corrosion of reinforcement.

Catholic Protection

This ...
... method of catholic protection involves providing an outside electric current to the steel, which prevents corrosion of the steel reinforcement. This is particularly useful for marine structures, bridges and tunnels. There are two ways to implement them:

Sacrificial Anode System: Employs a more electrochemically active metal (like zinc or magnesium) that corrode mainly instead of steel reinforcement.

ICCP (Impressed Current Catholic Protection) System − An external power source is used to provide a protective current through the rebar’s and thereby oxidization can be avoided.

Dr. Steep had us dig even a little deeper to learn about Electrochemical Chloride Extraction (ECE).

One of the main reasons for the corrosion of steel reinforcement is chloride contamination. Electrochemical chloride extraction is a method that employs a temporary electric field to extract chlorides from the concrete. This process restores the protective layer around the steel and retards corrosion once again.

Alkalization Treatment

Carbonation gradually reduces the pH of the concrete and can therefore degrade the ability of this concrete to protect the rebar’s from corrosion. Alkalization means bringing pH back to a normal value, by injecting an alkaline electrolyte solution and applying an external electric current. It increases the passivation of steel and as a result, it increases the durability of concrete structures.

Corrosion Inhibitors

Corrosion inhibitors act by creating a passive protective film on the surface of steel that can complement electrochemical corrosion control. These compounds could either be mixed with the concrete or applied at the surface.

Benefits of Electrochemical Corrosion Control

Increases Structural Durability: It prevents the corrosion of rebar and minimizes the risk of a structural failure.

Cost-Saving Maintenance Optics: Minimizes future repairs and maintenance.

Green Initiative: Requires less complete stripping of the building structure, giving it a sustainable nature.

Retrofit table: Which can be used to retrofit existing structures like aging infrastructure.

Conclusion

Electrochemical corrosion control: one of the most significant innovations in modern construction. Builders can use advanced protection methods such as catholic protection, electrochemical chloride extraction, and alkalization treatments to prevent corrosion damage. These techniques not only increase the longevity of concrete but also lead to lower maintenance costs over time, making them a sustainable long-term investment.