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Method for measuring localized corrosion rate with a multi-electrode array sensor

  • US 7,309,414 B2
  • Filed: 04/08/2005
  • Issued: 12/18/2007
  • Est. Priority Date: 04/09/2004
  • Status: Active Grant
First Claim
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1. A method of eliminating the effect of internal current in a multi-electrode array sensor at a corrosion site of interest, the sensor being capable of providing current measurement values from multiple electrodes, comprising:

  • exposing the sensor to the corrosion at the site of interest;

    wherein the sensor has an array of substantially similar metallic electrodes arranged such that each electrode has a surface area operable to be exposed to the corrosion site, and such that each electrode is electrically insulated from other electrodes;

    wherein each electrode is operable as an anode or cathode depending on the extent of corrosion at that electrode;

    wherein each electrode is electrically connected to a common node, such that the sensor simulates a one-piece electrode surface;

    determining an electrical potential value, Es, for the common node;

    wherein Es is substantially the minimum potential value at which the current measurement values from all electrodes are equal to or less than zero.

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