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Establishing a quantifiable tarnish timeline for comparison of anti-tarnish processes in metals
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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
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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...
| Published in: | Materials and Corrosion |
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| Published: |
2015
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| 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. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
10 |
| Start Page: |
1120 |
| End Page: |
1124 |