Developing electrochemical measurements in order to assess anti-corrosive coatings more effectively

Douglas J Mills, S Jamali, Mateusz T Tobiszewski

Research output: Contribution to journalArticleResearch

Abstract

The aim of this project was to check reproducibility of results obtained using NOCS (no connection to the substrate) arrangement of the electrochemical noise method (ENM). NOCS involves taking measurements from three nominally identical areas on the coated surface. Thus, no electrical connection to substrate is required. In practice the areas are not identical and various arrangements for connection of the three cells were tried to see if the individual areas could be separated out and whether the individual resistances could be computed. Also different ways of calculating the Rn (noise resistance) and Rsn (spectral noise resistance) parameters were attempted to see which one gave the best comparison with the more standard EIS measurements. The maximum entropy method was recognized to be the most useful for comparison with EIS, as well as for graphic evaluation of results. Regarding distinguishing three areas using different connection arrangements, it was possible to identify the situation when one of the three values was different to the other two. However further experiments are needed before it will be possible to confidently assign an Rn value to each individual area
Original languageEnglish
Pages (from-to)385-390
Number of pages6
JournalProgress in Organic Coatings
Volume74
Issue number2
Early online date2 Dec 2011
DOIs
Publication statusPublished - 1 Jun 2012

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coatings
entropy
reproducibility
methodology
cells

Keywords

  • Electrochemical noise method (ENM)
  • Coating assessment
  • NOCS arrangement
  • Data treatment

Cite this

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title = "Developing electrochemical measurements in order to assess anti-corrosive coatings more effectively",
abstract = "The aim of this project was to check reproducibility of results obtained using NOCS (no connection to the substrate) arrangement of the electrochemical noise method (ENM). NOCS involves taking measurements from three nominally identical areas on the coated surface. Thus, no electrical connection to substrate is required. In practice the areas are not identical and various arrangements for connection of the three cells were tried to see if the individual areas could be separated out and whether the individual resistances could be computed. Also different ways of calculating the Rn (noise resistance) and Rsn (spectral noise resistance) parameters were attempted to see which one gave the best comparison with the more standard EIS measurements. The maximum entropy method was recognized to be the most useful for comparison with EIS, as well as for graphic evaluation of results. Regarding distinguishing three areas using different connection arrangements, it was possible to identify the situation when one of the three values was different to the other two. However further experiments are needed before it will be possible to confidently assign an Rn value to each individual area",
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Developing electrochemical measurements in order to assess anti-corrosive coatings more effectively. / Mills, Douglas J; Jamali, S; Tobiszewski, Mateusz T.

In: Progress in Organic Coatings, Vol. 74, No. 2, 01.06.2012, p. 385-390.

Research output: Contribution to journalArticleResearch

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AU - Jamali, S

AU - Tobiszewski, Mateusz T

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AB - The aim of this project was to check reproducibility of results obtained using NOCS (no connection to the substrate) arrangement of the electrochemical noise method (ENM). NOCS involves taking measurements from three nominally identical areas on the coated surface. Thus, no electrical connection to substrate is required. In practice the areas are not identical and various arrangements for connection of the three cells were tried to see if the individual areas could be separated out and whether the individual resistances could be computed. Also different ways of calculating the Rn (noise resistance) and Rsn (spectral noise resistance) parameters were attempted to see which one gave the best comparison with the more standard EIS measurements. The maximum entropy method was recognized to be the most useful for comparison with EIS, as well as for graphic evaluation of results. Regarding distinguishing three areas using different connection arrangements, it was possible to identify the situation when one of the three values was different to the other two. However further experiments are needed before it will be possible to confidently assign an Rn value to each individual area

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