Abstract
The maintenance of the cathodric protection for marine steel structure has many problems. For example, all aluminium alloy anode investigation is very difficult, the life of aluminium alloy anode is often longer than assumption, and so on.
In this paper, we analized the investigation results of the weight and electric potential of anodes of steel piles of the jetty. We found the life of anodes is affected from electro coating, and suggest the evaluation method of the life of anodes in consideration of electro coating. Moreover, we suggest the estimation method of aluminium alloy anode weights from electric potential. In maintenance of cathodric protection, this method can lead to measure only electric potential without anode weights by diving survey.
In surveys, we found the electric potential of the steel structures is equal in spite of some anodes exhaustion. We suggested to evaluate the change of electric potential in anode exhaustion by the entire system modeling of the cathodic protection.
Utilizing these methods, it is made possible to adequately design to install new anodes.
