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Meter for Measuring Corrosion of Copper Piping Systems Inhibited by Benzotriazole

IP.com Disclosure Number: IPCOM000040280D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Dorler, JH: AUTHOR [+4]

Abstract

Some closed water systems are treated with benzotriazole (BTA) to inhibit the corrosion of copper parts by forming a protective film of benzotriazole-metal complex. A meter for determining the adequacy of this BTA film in protecting copper from corrosion has two copper electrodes, but is otherwise similar to commercial conductivity meters. The defect level in the BTA film on copper depends on the water chemistry and on the BTA concentration. A relative measure of the BTA film defect level, i.e., the degree to which the copper hardware is protected from corrosion, is the electrical resistance between two copper electrodes immersed in the water under test. The resistance measured for tap water, known to corrode copper, is in the 10-to-the-4 ohms range.

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Meter for Measuring Corrosion of Copper Piping Systems Inhibited by Benzotriazole

Some closed water systems are treated with benzotriazole (BTA) to inhibit the corrosion of copper parts by forming a protective film of benzotriazole-metal complex. A meter for determining the adequacy of this BTA film in protecting copper from corrosion has two copper electrodes, but is otherwise similar to commercial conductivity meters. The defect level in the BTA film on copper depends on the water chemistry and on the BTA concentration. A relative measure of the BTA film defect level, i.e., the degree to which the copper hardware is protected from corrosion, is the electrical resistance between two copper electrodes immersed in the water under test. The resistance measured for tap water, known to corrode copper, is in the 10-to-the-4 ohms range. The resistance corresponding to de-ionized water, known to be somewhat corrosive to copper, is in the 10-to-the-6 ohms range. The resistance measured for water containing a few hundred ppm BTA, known to protect copper, is in the 10-to-the- 8 ohms range. Therefore, the resistance between two copper electrodes can be used as a measure of corrosivity of waters in water systems inhibited by additions of BTA. The capacitance resulting from the BTA film can also be used as a measure of corrosion inhibition.

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