Influence of microstructure on the corrosion of archaeological iron observed using 3D synchrotron micro-tomography

HJ Simon; Giannantonio Cibin; C Reinhard; Y Liu; E Schofield; IC Freestone

doi:10.1016/j.corsci.2019.108132

Influence of microstructure on the corrosion of archaeological iron observed using 3D synchrotron micro-tomography

HJ Simon, Giannantonio Cibin, C Reinhard, Y Liu, E Schofield, IC Freestone

FSE Faculty Office - general

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Abstract

A combination of X-ray analytical techniques has been used to study the microstructure and corrosion of a 450-year-old cast-iron cannonball fragment from the Mary Rose shipwreck. Using a 3D approach, it has been shown that akaganeite, β-FeO(OH, Cl), starts to appear ˜1.5 mm below the outer surface of the object, occurring selectively around non-contiguous graphite flakes in the microstructure, with no corrosion in graphite-free regions. This spatial analysis has given a new look inside a 450-year-old system, to see how metallographic features interact with local chemical environments to give complex corrosion products, centuries in the making.

Original language	English
Article number	108132
Pages (from-to)	1-8
Number of pages	8
Journal	Corrosion Science
Volume	159
Early online date	1 Aug 2019
DOIs	https://doi.org/10.1016/j.corsci.2019.108132
Publication status	Published - Oct 2019

Keywords

archaeology
cast iron
conservation
graphite
Mary Rose
tomography

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10.1016/j.corsci.2019.108132

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abstract = "A combination of X-ray analytical techniques has been used to study the microstructure and corrosion of a 450-year-old cast-iron cannonball fragment from the Mary Rose shipwreck. Using a 3D approach, it has been shown that akaganeite, β-FeO(OH, Cl), starts to appear ˜1.5 mm below the outer surface of the object, occurring selectively around non-contiguous graphite flakes in the microstructure, with no corrosion in graphite-free regions. This spatial analysis has given a new look inside a 450-year-old system, to see how metallographic features interact with local chemical environments to give complex corrosion products, centuries in the making.",

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AU - Reinhard, C

AU - Liu, Y

AU - Schofield, E

AU - Freestone, IC

PY - 2019/10

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AB - A combination of X-ray analytical techniques has been used to study the microstructure and corrosion of a 450-year-old cast-iron cannonball fragment from the Mary Rose shipwreck. Using a 3D approach, it has been shown that akaganeite, β-FeO(OH, Cl), starts to appear ˜1.5 mm below the outer surface of the object, occurring selectively around non-contiguous graphite flakes in the microstructure, with no corrosion in graphite-free regions. This spatial analysis has given a new look inside a 450-year-old system, to see how metallographic features interact with local chemical environments to give complex corrosion products, centuries in the making.

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KW - conservation

KW - graphite

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KW - tomography

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Influence of microstructure on the corrosion of archaeological iron observed using 3D synchrotron micro-tomography

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