Paints alone cannot accord complete protection to underwater hull. Areas above keel blocks are not always possible to protect by painting. Stern areas suffer erosion due to high turbulence caused by propeller. In these areas, chances of galvanic corrosion are more due to presence of bronze propeller which is directly coupled to mild steel hull […]
Methods of Hull protection
Sacrificial Anodes
In this type of system, the ship’s hull is forced to become a cathode with respect to electrodes that are positive with respect to the ship’s hull. The electrodes used for this purpose are Zinc, Magnesium and Aluminium, However, in all the three, Zinc is very popular. These electrodes provide galvanic current and in the […]
Theory behind Impressed current cathodic protection
Impressed current cathodic protection is a method for ship’s hull protection. But, before discussing the Impressed current cathodic protection, its important to know the theory and history of cathodic protection. Cathodic Protection is a method of controlling corrosion and is based on electrochemical process. In this method, the corrosion of the cathode is achieved by […]
Operation of Impressed current cathodic protection
Earlier, We had discussed about the theory behind the use of Impressed current cathodic protection. To refer the aforesaid post, visit https://electricalfundablog.com/blog/?p=731 . Lets discuss how the operation of Impressed current cathodic protection is carried out practically with equipments. The power to the unit is fed from the 440V AC, 60 Hz, 3 phase supply. However, […]