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08050 Permanent Reference Half Cells - Part 2: Polarization Tests

Picture for 08050 Permanent Reference Half Cells - Part 2: Polarization Tests
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Product Number: 51300-08050-SG
ISBN: 08050 2008 CP
Author: Telma Regina Salgado Villela, Hosam Abdel-Rehim, Mauricio Guerrante, and Joao Hipolito Oliver
Publication Date: 2008
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Permanent reference electrodes, PRE, should be evaluated to determine lifetime and resistance to accidental short circuiting to the protected structure. Two types of Cu/CuSO4 electrodes were studied, one for arid soil and another for humid soils. A Zn electrode simulating the protected structure was connected directly or through 1kohm resistance to the studied PRE. The current and potential values were monitored with time, using portable Cu/CuSO4 electrode to minimize side currents. All immersed in water. The results showed that PRE for arid soils have very low resistance for short circuiting and are destroyed irreversibly in very short time, around 10 to 15 minutes. This corresponds to less than 5% of the announced lifetime. However these electrodes can be recovered by specific treatment. Test using 1kohm resistance showed that these electrodes barely have the announced life time. The PRE’s for humid soils responded correctly showing the expected lifetime announced in both type of connections.
Permanent reference electrodes, PRE, should be evaluated to determine lifetime and resistance to accidental short circuiting to the protected structure. Two types of Cu/CuSO4 electrodes were studied, one for arid soil and another for humid soils. A Zn electrode simulating the protected structure was connected directly or through 1kohm resistance to the studied PRE. The current and potential values were monitored with time, using portable Cu/CuSO4 electrode to minimize side currents. All immersed in water. The results showed that PRE for arid soils have very low resistance for short circuiting and are destroyed irreversibly in very short time, around 10 to 15 minutes. This corresponds to less than 5% of the announced lifetime. However these electrodes can be recovered by specific treatment. Test using 1kohm resistance showed that these electrodes barely have the announced life time. The PRE’s for humid soils responded correctly showing the expected lifetime announced in both type of connections.
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