When SL Dolly was recovered from Ullswater after being submerged for 67 years,
the wrought iron boiler was found to have surprisingly little corrosion. This
article describes the results of a project to investigate the reasons for this
behaviour and determine whether it was a property of the wrought iron or a
consequence of the lakebed environment. Weight loss measurements and
electrochemical impedance spectroscopy were used to compare the corrosion rates
of wrought iron and modern boiler steel exposed to tap water and samples of lake
water and lakebed sediment. A corrosion probe was used to make in situ linear
polarisation resistance measurements at the spot where Dolly sank. The corrosion
rate of wrought iron on the lakebed was estimated to be in the range
0à ·018â  0à ·030 mm year-1, which corresponds to a metal loss of 1à ·2â  2à ·0 mm
over the 67 year period; this metal loss is consistent with the condition of the
boiler. The effects of microstructure, material composition and water chemistry
are considered in detail, and it is concluded that the low oxygen content and
the low concentration of dissolved solids in the lake water were the underlying
causes of the observed corrosion b
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