Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1979-08-09
1981-03-10
Weisstuch, Aaron
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204196, 204231, C23F 1300
Patent
active
042552427
ABSTRACT:
In making measurements of the potential of a structure immersed in an electrolyte, which structure is being protected from corrosion by a cathodic or anodic protection system, serious errors are often introduced by the IR drop component induced by current flowing between the cathode and anode of the protection system on a reference cell which is used for measurement. To overcome this, a system is provided of the type including means for applying a rectified alternating current voltage between the structure and an electrode which is immersed in the electrolyte and spaced apart from the structure. A direct current reference source is coupled to the structure. A reference cell is located in the electrolyte and spaced apart from the structure. The reference cell is also coupled to means for measuring the potential produced by the reference cell and the structure wherein the measuring means includes means for separating any voltage component of the rectified alternating current at the reference cell from the direct current voltage produced by the reference cell. The measuring means also includes output means for providing an output voltage having only the cell-to-structure potential to indicate the potential of the structure to be protected without interference from the alternating current rectified voltage. This arrangement allows for elimination of the IR drop from the measurement using only a single reference cell for each set of measurements. Further, there is no need for interrupting the cathode to anode current flow or for carefully timing the relationship of the cathode to anode current with the timing of the measurement.
REFERENCES:
patent: 3142631 (1964-07-01), Woodley
patent: 3362900 (1968-01-01), Sabins
patent: 3409526 (1968-11-01), Banks et al.
patent: 3425921 (1969-02-01), Sudrabin
patent: 3634222 (1972-01-01), Stephens, Jr.
patent: 4080272 (1978-03-01), Ferry et al.
Freeman Industries, Inc.
Valentine D. R.
Weisstuch Aaron
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