Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1982-05-03
1984-03-20
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204196, C23F 1300
Patent
active
044379579
ABSTRACT:
To protect a structure immersed in an electrolyte, at least two protection units are located adjacent to different regions of the protected structure. In a preferred embodiment, each of these protection units includes a circuit for applying rectified alternating current voltage between the structure and electrodes immersed in the electrolyte adjacent to the different regions of the structure. Also, each of the protection units includes reference cells to produce direct current voltage between the reference cells and the structure, a measuring circuit coupled to the reference cells for measuring the potential between the reference cells and the structure, and a control circuit for controlling the level of the rectified alternating current voltage at the different regions of the structure in accordance with the measured potential levels. The first and second protection units are arranged to be independent of one another so that the level of alternating current voltage applied between the different regions of the structure and the first and second protection units will be independently established. In alternative embodiments, constant current or constant voltage can be applied by the protection units rather than utilizing the reference cell feedback control.
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Freeman Industries, Inc.
Tung T.
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