Ways of increasing the effectiveness of the electrochemical noise method for assessment of organic coatings on metal

S Jamali, Douglas J Mills, Christopher Paul Woodcock

Research output: Contribution to journalArticleResearch

Abstract

The most practically useful arrangement for making Electrochemical Noise Measurements is NOCS. Previously reported work using NOCS suggested that the arrangement had somewhat increased sensitivity to error (drift, spikes etc) in the value of noise resistance (Rn) that was calculated. The current work looked to address this by using an improved data analysis approach using a drift removal programme. Also Rsn (spectral noise resistance at 0.002Hz) has been calculated using either the MEM or FFT methods and compared with (Rn)To investigate possible ambiguity arising from interrogating three separate areas, samples with known values of resistance (high, medium and low) were joined in combinations and Rn measured. It was found that the cell connected to the reference input tended to dominate ie potential noise prevails over current noise. With some refinement, the NOCS method should soon be a practical method for field application.
Original languageEnglish
Pages (from-to)115-125
Number of pages11
JournalECS Transactions
Volume24
Issue number1
DOIs
Publication statusPublished - 1 Jan 2010

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coatings
metals
Mars Excursion Module
fast Fourier transformations
high resistance
noise measurement
white noise
spikes
ambiguity
sensitivity
cells

Keywords

  • Electrochemical noise measurement

Cite this

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abstract = "The most practically useful arrangement for making Electrochemical Noise Measurements is NOCS. Previously reported work using NOCS suggested that the arrangement had somewhat increased sensitivity to error (drift, spikes etc) in the value of noise resistance (Rn) that was calculated. The current work looked to address this by using an improved data analysis approach using a drift removal programme. Also Rsn (spectral noise resistance at 0.002Hz) has been calculated using either the MEM or FFT methods and compared with (Rn)To investigate possible ambiguity arising from interrogating three separate areas, samples with known values of resistance (high, medium and low) were joined in combinations and Rn measured. It was found that the cell connected to the reference input tended to dominate ie potential noise prevails over current noise. With some refinement, the NOCS method should soon be a practical method for field application.",
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Ways of increasing the effectiveness of the electrochemical noise method for assessment of organic coatings on metal. / Jamali, S; Mills, Douglas J; Woodcock, Christopher Paul.

In: ECS Transactions, Vol. 24, No. 1, 01.01.2010, p. 115-125.

Research output: Contribution to journalArticleResearch

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