Corrosion and conservation management of iron shipwrecks in Chuuk Lagoon, Federated States of Micronesia

Ian Donald MacLeod

26 citations0/0 files storedConservation and Management of Archaeological Sites

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Maritime and Coastal Archaeology Corrosion Behavior and Inhibition Conservation Techniques and Studies

Abstract

A series of in situ corrosion measurements on World War II Japanese merchant and military vessels sunk in Chuuk (Truk) Lagoon in 1944 was conducted in 2002 as part of a study of the cultural heritage values of the wreck sites. The data provide evidence of episodic loss of the protective layer of marine concretion, which directly increases corrosion of the underlying metal and removal of the archival microenvironment record. It is likely that dynamite ‘fishing’ is the most likely cause of such losses. All the vessels, apart from the Fujikawa Maru, showed a corrosion mechanism that is common to historic iron shipwrecks. The apparent sensitivity of the corrosion potentials and the pH of the corroding interfaces to water depth have been interpreted in terms of the overall amount of water movement and the aspect or orientation of the wrecks with regard to being horizontal, upside down or inclined. Corrosion rate equations predict that many of the wrecks in Chuuk Lagoon will retain their existing integrity for the next ten to fifteen years before undergoing significant collapse. The corrosion rates in Chuuk Lagoon were between 26%and 30% lower than the iron shipwrecks at the same depth in open-ocean waters.

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References

1995In situcorrosion studies on the Duart Point wreck, 1994 1982Formation of marine concretions on copper and its alloys 2004World War II Underwater Cultural Heritage Sites in Truk Lagoon: Considering a Case for World Heritage Listing 1989The application of corrosion science to the management of maritime archaeological sites 1987Conservation of corroded iron artefacts-new methods for on-site preservation and cryogenic deconcreting

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2015Memorialization, Graffiti and Artifact Movement: A Case Study of Cultural Impacts on WWII Underwater Cultural Heritage in the Commonwealth of the Northern Mariana Islands 2016A Framework for Managing Diver Impacts on Historic Shipwrecks 2017Assessing the Impact of Typhoons on Historic Iron Shipwrecks in Chuuk Lagoon Through Changes in the Corrosion Microenvironment 2018Characterization of the alteration processes of historical glasses on the seabed 2011In situ conservation surveys of iron shipwrecks in Chuuk Lagoon and the impact of human intervention 2011Managing a Monitor — the Case of HMVSCerberusin Port Phillip Bay: Integration of Corrosion Measurements with Site Management Strategies

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