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99548 ELECTROCHEMICAL AGING OF HUMECTANT-TREATED THERMAL-SPRAYED ZINC ANODES FOR CATHODIC PROTECTION

Picture for 99548 ELECTROCHEMICAL AGING OF HUMECTANT-TREATED
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Product Number: 51300-99548-SG
ISBN: 99548 1999 CP
Author: H. M. Laylor, J. E. Bennett, B. S. Covino, Jr., G. R. Holcomb, S. J. Bullard, J. H. Russell, S. D. C
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Humectants, substances that promote the retention of moisture, were studied to determine their effectiveness in improving the performance and extending the service life of both new and previouslyaged thermal-sprayed Zn anodes used in impressed current (ICCP) and galvanic cathodic protection (GCP) systems for steel-reinforced concrete structures. Potassium acetate, lithium nitrate, and lithium bromide were applied to a series of thermal-sprayed Zn-coated concrete slabs before starting the ICCP or GCP experiment. All of the humectants altered the behavior of the thermal-sprayed Zn anodes. LiNOJ was the most beneficial for ICCP anodes and LiBr was the most beneficial for GCP anodes. Circuit resistances for ICCP anodes and galvanic current density for GCP anodes are compared on the basis of electrochemical aging, humidity, and type of humectant. Keywords: Zq anode, humectant, thermal spray, arc spray, cathodic protection, impressed current, sacrificial, galvanic, steel-reinforced concrete, bridge, electrochemical aging, circuit resistance, humidity, potassium acetate, lithium nitrate, lithium bromide
Humectants, substances that promote the retention of moisture, were studied to determine their effectiveness in improving the performance and extending the service life of both new and previouslyaged thermal-sprayed Zn anodes used in impressed current (ICCP) and galvanic cathodic protection (GCP) systems for steel-reinforced concrete structures. Potassium acetate, lithium nitrate, and lithium bromide were applied to a series of thermal-sprayed Zn-coated concrete slabs before starting the ICCP or GCP experiment. All of the humectants altered the behavior of the thermal-sprayed Zn anodes. LiNOJ was the most beneficial for ICCP anodes and LiBr was the most beneficial for GCP anodes. Circuit resistances for ICCP anodes and galvanic current density for GCP anodes are compared on the basis of electrochemical aging, humidity, and type of humectant. Keywords: Zq anode, humectant, thermal spray, arc spray, cathodic protection, impressed current, sacrificial, galvanic, steel-reinforced concrete, bridge, electrochemical aging, circuit resistance, humidity, potassium acetate, lithium nitrate, lithium bromide
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