Galvanic corrosion may occur in fresh or salt water. It generally happens whenever two/or more metallic elements having unlike galvanic-voltages connects to each other electrically in the presence of an electrolyte. In other words, it can also be said that Galvanic corrosion is an outcome of the usual property of an active metal (greater in […]
Corrosion
Corrosion
It is generally understood that Corrosion means rust and is treated like an almost universal object of hatred. This word ‘Rust’ has been specifically reserved for iron corrosion. However, Not so many knows that corrosion is such a destructive process which affects almost all metals. Since iron is the first and most extensively used metal […]
Oxidation Corrosion
Most of the metals are naturally available in a chemically shared condition which we know as ORE. It is very usual to get an oxide, a carbonate, a sulphide or another compound in nature. In another words, we can say that most of the metals are naturally available in a mixed state. The reason for […]
Hull protection methods
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 […]
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 […]