Sacrificial Anode Consumption Behavior of Ballast Tank Based on Scale Model

A method for online monitoring sacrificial anode consumption rate and evaluating its remaining life was presented. A ballast tank scale model was set up to verify the above evaluation method. This method calculated the anode consumption rate and remaining life by the online monitored current of the sacrificial anode in different life stages (coating damage rate). The results show that the method could accurately evaluate the consumption mass of the sacrificial anode. At the same time, the rise of temperature increased the anode current, but the structure protection potential decreased meanwhile, and the efficiency of the sacrificial anode decreased. During the whole life period, when the damage rate of the coating was less than 10.0%, the requirement of current density was larger than the recommended value of some specification. The structure polarization current at this stage could be appropriately increased to make the ballast tank under better protection.