CATHODIC CORROSION PROTECTION WITH CURRENT LIMITER

(19)

(11)

EP 4 424 872 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	30.04.2025 Bulletin 2025/18

(43)	Date of publication A2:
	04.09.2024 Bulletin 2024/36

(21)	Application number: 24188688.6

(22)	Date of filing: 13.04.2021

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International Patent Classification (IPC):

C23F 13/04^(2006.01)

C23F 13/20^(2006.01)

(52)	Cooperative Patent Classification (CPC):
	C23F 13/04; C23F 13/20; C23F 2201/02; C23F 2213/21

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

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Priority:

27.04.2020 US 202016859029

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	21168231.5 / 3904559

(71)	Applicant: Vector Remediation Ltd.
	Winnipeg, Manitoba R3Y 1G4 (CA)

(72)	Inventors:
	Whitmore, David William Winnipeg, R3T 3E5 (CA) Child, Geoffrey Richard Manitoba, R3K 2A3 (CA) Simpson, David Matthew Halesowen, B63 2AR (GB) Sergi, George Walsall, WS5 3HK (GB) Beaudette, Martin Richard Winnipeg, R3V 1R8 (CA)

(74)	Representative: Barker Brettell LLP
	100 Hagley Road Edgbaston Birmingham B16 8QQ Birmingham B16 8QQ (GB)

(54)	CATHODIC CORROSION PROTECTION WITH CURRENT LIMITER

(57) In a method for cathodically protecting and/or passivating a metal section in an ionically conductive material such as steel reinforcement in concrete or mortar, an impressed current or sacrificial anode communicates ionic current to the metal section and a storage component of electrical energy which can be a cell, battery or capacitor is provided as a component of the anode. A current limiter is provided which prevents excess current draining the supply. This can be a semi-conductive device such as a transistor or diode is connected in the path from the anode to the metal section to limit the cathodic protection current to a value of the order of 1 milliamp. When a diode or similar device is used the current can be limited to the reverse leakage current of the diode.

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