Abstract
This study presents a controlled sacrificial anode (magnesium anodes) cathodic protection system for aboveground storage tanks. The proposed method is able to control the anode’s current, which leads to enhance the performance of anodes, therefore, increase the anode’s lifetime. The proposed system has been implemented in a laboratory-based tank contains saline water (5661 ppm). In this experiment, the overprotection and anode energy loss were eliminated, and the anodes lifetime has been extended 35.55 times higher compared to the conventional system. The proposed method reduced the protection current and stabilized the system overall.
Highlights
The corrosion process is an oxidation–reduction reaction concept where electrons are removed from a metal surface and replace them with oxygen from the surrounding environment [1, 2]
In corrosion control of metallic structures, the main issue with the conventional sacrificial anode system is the excessive, uncontrollable current flow by the anodes, which leads to high current flow to the storage tank and causing overprotection, coating defect, and short anode’s lifetime
The cathodic protection system can be applied to any metallic structure such as tanks, buried pipelines, ships, marine’s jetties, and any metals that have contact with electrolytes such as soil or water [5]
Summary
The corrosion process is an oxidation–reduction reaction concept where electrons are removed from a metal surface and replace them with oxygen from the surrounding environment [1, 2]. The cathodic protection system can be applied to any metallic structure such as tanks, buried pipelines, ships, marine’s jetties, and any metals that have contact with electrolytes such as soil or water [5]. The ICCP system requires an external DC power source that is connected to the structure by using particular types of anodes, while CP with SA does not require any external power source. The former one is more suitable for the protection of larger structures like long pipe systems, while the latter one is more suitable for the protection of smaller structures such as tanks [7], which is the interest of this study. In conventional SA systems of structures in the sea and freshwater, the anodes are directly connected by welding to the body of the structure
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