Ships are often exposed to very harsh marine environments. Due to the environment in which they operate, the ship’s hull is often exposed sea environmental corrosion that can reduce the life.

The corrosion of seawater as regards to general corrosion on steel increases with increasing temperature, oxygen content, water velocity, the content of corrosive contaminants, eroding particles, and conductivity. The seawater containing salt forms a perfect electrolyte with the ship’s hull, fully made up of iron (mild steel), to form a galvanic cell.

Galvanic cell occurs when two dissimilar are in contact with each other leads to corrosive medium (electrolyte) i.e. the more active metal undergoes corrosion and the less active metal acts as a cathode and stays protected. Like that way, people use to paint the ship hull. But it is impossible to paint often, since it can done only in dry dock condition.

So that people go for depressed current cathodic protection system with sacrificial anodes like aluminum, zinc, magnesium and GI anodes. But we should replace the anodes in very short period. 

Impressed current cathodic protection with MMO Coated and Platinum plated Titanium and Niobium anodes will last longer for 15 to 20 years and reference electrode for monitoring the system.