Method for measuring localized corrosion rate with a multi-electrode array sensor
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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Abstract
A method of measuring localized corrosion, using a multi-electrode array sensor. The method eliminates the effect of internal current in corroded electrodes, and thus provides a more accurate corrosion measurement. In one embodiment, the potential of a common node of the sensor is adjusted so that the sensor'"'"'s most cathodic current is close to zero.
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Citations
5 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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5. A method of eliminating the effect of internal current in a multi-electrode array sensor when measuring corrosion at a corrosion site of interest, the sensor being capable of providing current measurement values from multiple electrodes, comprising:
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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; raising the potential at the common node from open circuit; measuring currents from the electrodes; repeating the raising and measuring steps to determine the minimum potential value at which the currents measure zero or less than zero; and applying the minimum potential value to the common node.
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Specification