Investigation Of Ballast Water Treatment's Effect On Corrosion.

摘要

The objective of this study was to characterize the corrosion behavior associated with ballast water treatments on ballast tank and piping alloys common to oceangoing and fresh water vessels. The work compares and contrasts the effect of ballast water treatment methods on various alloys routinely encountered in ballast tanks and ballast water systems aboard both fresh water and ocean going vessels. Controlled laboratory tests were conducted using simulated chlorination, deoxygenation and chlorine dioxide disinfection. Materials were exposed to three environments: the humid or overhead environment, alternate immersion, and constant immersion. The tests were divided into two phases: the Seawater Phase and the Freshwater (Great Lakes Water) Phase and was based on guidance provided by the International Maritime Organization. Natural, unfiltered seawater obtained from Key West, FL, for seawater testing; Great Lakes water was supplied by collecting water from Lake Superior at the Arthur McClure Marine Terminal in Duluth, MN. The set up and test procedures of both the Seawater Phase and the Great Lakes Water Phase were identical, in as far as is practicable.