Corrosion analysis of ferrous hull plate samples from wrecks in Scapa Flow
Date January 2014
Event ID 1173505
Category Documentary Reference
Type Specialist Report
Permalink http://canmore.org.uk/event/1173505
Corrosion analysis based on the Weins Number Methodology was undertaken on one sample from SS Prudentia. The sample was identified as ‘Prudentia 2/5/13 26m Forward Stores hatch’. Laboratory analysis by Intertek indicates that the steel plate sample had a measured plate thickness of 0-9.3mm, with concretion on both sides of the plate. There were two obvious rivet holes through the plate prior to concretion removal. Iron contents of the sample was measured at 35.4% by weight. The plate was heavily pitted and had thinned and perforated producing a ragged edge. The thickest regions were around the rivet holes. The average corrosion rate from sinking in 1916 to recovery of the sample in 2013, as calculated from concretion data, was measured at 0.0169 mm/year.
Information from M.Skelhorn (Salvage and Marine Operations, MoD) 2014
