2012 Volume 61 Issue 12 Pages 464-470
Various types of materials, stainless steels, cast irons, Ni-Resist cast irons, copper alloys, etc, are applied to seawater pumps. And the pump materials are changing with the times. Seawater contains a large amount of minerals salts, mainly chloride, therefore, its conductivity is high, and these lead to high corrosiveness. For this reason, the maintenance and management of machinery and equipment, as well as structures, which handle seawater are important issues in terms of corrosion protection.
The author et al. has carried out intensive R&D on the corrosion and corrosion protection of seawater pumps. This paper offers explanations on our notable R&D on seawater corrosion, including galvanic corrosion, differentialflow-rate-cell-corrosion, SCC of Ni-Resist cast irons and the development of welded structure duplex stainless steel seawater pumps.