Recent UK work investigating anti-corrosive organic coatings using the electrochemical noise method (ENM)

S J Mabbutt, Douglas J Mills

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The Electrochemical Noise Method (ENM) monitors the small potential and current fluctuations that occur naturally in electrochemical cells. It is the least intrusive of all electrochemical techniques in regular use. This paper reviews recent work using the Electrochemical Noise Method to investigate waterborne and solvent based coating systems. The coating systems were investigated on the substrate both as intact coatings and as scribed coatings. In general, the former has corroborated previous work where Rn values of >1 x 107 ohms/cm2 were indicative of protection. In the scribed work the level of protection afforded at the exposed metal surface by the coating was correlated directly with the Noise Resistance value. Also detached films were examined in a novel test cell that can be used to simulate different conditions. Results show that the ENM has useful applications in the laboratory for monitoring the accelerated testing of coatings and to investigate environmentally-friendly inhibitive pigments. The technique could be adapted for in-situ monitoring of structures in the field and a new experimental technique has been devised to enable measurements to be made on electrically connected substrate areas
Original languageEnglish
Pages (from-to)277-283
Number of pages7
JournalSurface Coatings International, Part B: Coatings Transactions
Volume84
Issue number4
DOIs
Publication statusPublished - 1 Nov 2001

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coatings
coating
electrochemical cells
pigments
metal surfaces
monitors
cells

Keywords

  • Coating Transaction
  • Zinc Phosphate
  • Electrochemical Noise
  • Surface Coating International Part
  • Bridge Method

Cite this

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abstract = "The Electrochemical Noise Method (ENM) monitors the small potential and current fluctuations that occur naturally in electrochemical cells. It is the least intrusive of all electrochemical techniques in regular use. This paper reviews recent work using the Electrochemical Noise Method to investigate waterborne and solvent based coating systems. The coating systems were investigated on the substrate both as intact coatings and as scribed coatings. In general, the former has corroborated previous work where Rn values of >1 x 107 ohms/cm2 were indicative of protection. In the scribed work the level of protection afforded at the exposed metal surface by the coating was correlated directly with the Noise Resistance value. Also detached films were examined in a novel test cell that can be used to simulate different conditions. Results show that the ENM has useful applications in the laboratory for monitoring the accelerated testing of coatings and to investigate environmentally-friendly inhibitive pigments. The technique could be adapted for in-situ monitoring of structures in the field and a new experimental technique has been devised to enable measurements to be made on electrically connected substrate areas",
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Recent UK work investigating anti-corrosive organic coatings using the electrochemical noise method (ENM). / Mabbutt, S J; Mills, Douglas J.

In: Surface Coatings International, Part B: Coatings Transactions, Vol. 84, No. 4, 01.11.2001, p. 277-283 .

Research output: Contribution to journalArticleResearchpeer-review

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N2 - The Electrochemical Noise Method (ENM) monitors the small potential and current fluctuations that occur naturally in electrochemical cells. It is the least intrusive of all electrochemical techniques in regular use. This paper reviews recent work using the Electrochemical Noise Method to investigate waterborne and solvent based coating systems. The coating systems were investigated on the substrate both as intact coatings and as scribed coatings. In general, the former has corroborated previous work where Rn values of >1 x 107 ohms/cm2 were indicative of protection. In the scribed work the level of protection afforded at the exposed metal surface by the coating was correlated directly with the Noise Resistance value. Also detached films were examined in a novel test cell that can be used to simulate different conditions. Results show that the ENM has useful applications in the laboratory for monitoring the accelerated testing of coatings and to investigate environmentally-friendly inhibitive pigments. The technique could be adapted for in-situ monitoring of structures in the field and a new experimental technique has been devised to enable measurements to be made on electrically connected substrate areas

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