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Establishing a quantifiable tarnish timeline for comparison of anti-tarnish processes in metals / H.N.S. Yousef, R.J. Cobley, H.M. Davies, D.M. James, S. Mehmood, E. Sackett, J. Sienz, Helen Davies, Haitham Yousef, Richard Cobley, Elizabeth Sackett

Materials and Corrosion, Volume: 66, Issue: 10, Pages: 1120 - 1124

Swansea University Authors: Helen Davies, Haitham Yousef, Richard Cobley, Elizabeth Sackett

DOI (Published version): 10.1002/maco.201407969

Abstract

Brass samples were controllably tarnished using the thioacetamide accelerated corrosion (ISO 4538:1995) and synthetic sweat (ISO 3160–2:2003) methods. Spectrophotometry, energy dispersive X-ray spectroscopy (EDX) and electrochemical impedance spectroscopy (EIS) were performed on samples tarnished fo...

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Published in: Materials and Corrosion
Published: 2015
URI: https://cronfa.swan.ac.uk/Record/cronfa20511
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Abstract: Brass samples were controllably tarnished using the thioacetamide accelerated corrosion (ISO 4538:1995) and synthetic sweat (ISO 3160–2:2003) methods. Spectrophotometry, energy dispersive X-ray spectroscopy (EDX) and electrochemical impedance spectroscopy (EIS) were performed on samples tarnished for set exposure times over seven days. Synthetic sweat produced a loose surface corrosion layer, which limited the use of EIS and spectrophotometry, but for the thioacetamide method both measurements produced a continuous change over the time period. EDX was able to observe a continuous change in the surface layer chemistry for both methods over the whole timescale and represents the best characterisation method to establish an equivalent tarnish timeline against which anti-tarnish treated samples can be compared. The current study was conducted using brass, however the method can be used for quantifying tarnish on other metallic systems.
College: College of Engineering
Issue: 10
Start Page: 1120
End Page: 1124