Anodes fitted to Sea chest |
Marine fouling and biological fouling is a common issue in
the sea water system. This leads to the corrosion of the pipe line and
interference in the flow of sea water. The fouling organism enters the system
in both microscopic and macroscopic form, settle and replicate under favorable
conditions.
Traditionally chemicals were used to prevent the growth of
these kinds of organism in the sea water system. Chlorination was one the
widely used method. But chlorine itself accelerates corrosion rates, usually by
causing pitting attack on steel. More over this kind of method requires
continuous monitoring and control.
So now a day’s ships are equipped with MGPS. MGPS stands for
Marine Growth Prevention System. Its basic principle is based on the ICCP
system. Direct Current is applied to the anodes to emit ions in the environment
in order to change it into an unfavorable condition for the growth of fouling
organism. Normally Copper Anode and Aluminium anodes are used. Sometimes
Ferrous anode is also used.
Copper Anode – Antifouling
Aluminium Anode – Reduction in corrosion of steel materials
Ferrous Anode – Reduction of corrosion of copper based
materials
The Direct Current applied on the copper anodes gives out
controlled amount of Cu ions in the system and creates an environment which is unfavorable
for the growth of marine life. The current applied to Aluminium anodes releases
a precipitate of aluminium hydroxide products that reduces the corrosion rates
on ferrous components in the seawater system by modifying the ferrous oxides
formed and film deposition
Whether we normally instal ferrous anode onboard?
ReplyDeletepls anyone help me....
Thanks inn advance
i have seen on aluminium and copper anode in use
Deleteno we dont use
ReplyDeletewe commonly use only copper and Aluminium anodes. A Chief Engineer
ReplyDeleteAnyone know current settings??
ReplyDelete