Meter for Measuring Corrosion of Copper Piping Systems Inhibited by Benzotriazole
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
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.