Title:
CATHODIC PROTECTION SYSTEM UTILIZING A MEMBRANE
Document Type and Number:
WIPO Patent Application WO2002040747
Kind Code:
A3
Abstract:
A cathodic protection system for corrosion protection of metallic structures in contact with aqueous solutions such as salt water and calcium chloride brine. The system employs anode chambers containing hydroxide anolytes segregated from the electrolyte containing chloride by an ion-exchange membrane. The anode and the structures to be protected are coupled to voltage and current sources impressing current at the immersed surfaces of metallic structures to maintain these surfaces close to an equipotential and covered with a bound layer of polarized hydroxide. The preferred embodiment is used in connection with stainless steel holding tanks and associated equipment used to circulate calcium chloride brine to freeze whole muscle turkeys. When the brine and the anolyte contact the membrane, a bi-ionic potential forms across the membrane that drives the counter-directed transport of ions through the membrane, thereby preventing the anodic production of C12. Additionally, pH control is employed and a controller is coupled to one or more of a series of reference electrodes used to monitor the potential differences between the electrodes and the metal surfaces to be cathodically protected. If the potential difference falls outside of a predetermined range, due to changing exposure conditions and/or operating parameters, the applied voltage is adjusted so that the current from the anode produces a polarized and alkaline protective film at the metallic surfaces of the holding tank and associated equipment so as to counteract and overcome the corrosive properties of the brine.
Inventors:
RUSSELL GORDON I (CA)
Application Number:
PCT/CA2001/001629
Publication Date:
February 19, 2004
Filing Date:
November 16, 2001
Export Citation:
Assignee:
RUSSELL GORDON I (CA)
International Classes:
C23F13/02; C23F13/06; (IPC1-7): C23F13/02
Foreign References:
| US2329961A | 1943-09-21 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 012, no. 128 (C - 489) 20 April 1988 (1988-04-20)
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