The effects of storms and diving activities on the corrosion rate across the SS Yongala (1911) site in the Great Barrier Reef

Abstract

The initial assessment of the condition of the wreck of the SS Yongala (1911) took place in 2005 and was followed with additional in-situ measurements on three field trips in 2007. Analysis of the corrosion potential, pH and plate perforation data confirmed that the superstructure, deck and hull plates are highly corroded and that the most extensive corrosion is on the port side gunwale. The high corrosion rates found at the forward end hull/forecastle deck level and at the stern near the rudder are consistent with the exposed locations which lie proud of the seabed and are subject to significant water movement across the site. Comparison of the original structure and its present condition with site records from previous visits suggest that the wreck is following the Riley waterline theory with the port side frames eventually collapsing and the bow and or stern section breaking off from the vessel. This collapse could happen at or near hold 3 and or around holds 1 and 2. Currently the bow is corroding at a higher rate than the stern end. Changes in the souring of the site and past practices of tying up to the wreck have been significant factors in accelerating the corrosion of this historically significant iron shipwreck.

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