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Materials 2013, 6(10), 4345-4360; doi:10.3390/ma6104345
Concept Paper

Characterisation of Crevice and Pit Solution Chemistries Using Capillary Electrophoresis with Contactless Conductivity Detector

1,* , 1
,
2
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2
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1
 and
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1 National Centre for Advanced Tribology at Southampton (nCATS), Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK 2 Electronics and Computer Science, Faculty of Physical Sciences and Engineering, University of Southampton, Southampton SO17 1BJ, UK 3 Physical Sciences Department, Defence Science and Technology Laboratory (Dstl), Porton Down, Salisbury SP4 0JQ, UK
* Author to whom correspondence should be addressed.
Received: 4 July 2013 / Revised: 18 September 2013 / Accepted: 23 September 2013 / Published: 30 September 2013
(This article belongs to the Special Issue Corrosion Monitoring and Control)
Download PDF [578 KB, 11 October 2013; original version 30 September 2013]

Abstract

The ability to predict structural degradation in-service is often limited by a lack of understanding of the evolving chemical species occurring within a range of different microenvironments associated with corrosion sites. Capillary electrophoresis (CE) is capable of analysing nanolitre solution volumes with widely disparate concentrations of ionic species, thereby producing accurate and reliable results for the analysis of the chemical compositions found within microenvironment corrosion solutions, such as those found at crevice and pit corrosion sites. In this study, CE with contactless conductivity detection (CCD) has been used to characterize pitting and crevice corrosion solution chemistries for the first time. By using the capillary electrophoresis with contactless conductivity detection (CE-CCD) system, direct and simultaneous detection of seven metal cations (Cu2+, Ni2+, Fe3+, Fe2+, Cr3+, Mn2+, and Al3+) and chloride anions was achieved with a buffer solution of 10 mM 2,6-pyridinedicarboxylic acid and 0.5 mM cetyltrimethylammonium hydroxide at pH 4 using a pre-column complexation method. The detection limits obtained for the metal cations and chloride anions were 100 and 10 ppb, respectively. The CE-CCD methodology has been demonstrated to be a versatile technique capable of speciation and quantifying the ionic species generated within artificial pit (a pencil electrode) and crevice corrosion geometries for carbon steels and nickel-aluminium bronze, thus allowing the evolution of the solution chemistry to be assessed with time and the identification of the key corrosion analyte targets for structural health monitoring.
Keywords: structural health monitoring; corrosion solution chemistries; corrosion monitoring; capillary electrophoresis; contactless conductivity detection structural health monitoring; corrosion solution chemistries; corrosion monitoring; capillary electrophoresis; contactless conductivity detection
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nie, M.; Wharton, J.A.; Cranny, A.; Harris, N.R.; Wood, R.J.; Stokes, K.R. Characterisation of Crevice and Pit Solution Chemistries Using Capillary Electrophoresis with Contactless Conductivity Detector. Materials 2013, 6, 4345-4360.

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