Humectants To Augment Current From Metallized Zinc Cathodic Protection Systems on Concrete

Holcomb, Gordon R. ; Covino, Bernard S., Jr. ; Cramer, Stephen D. ; Russell, James H. ; Bullard, Sophie J. ; Collins, W. Keith ; Bennett, Jack E. ; Soltesz, Steven M. ; Laylor, H. Martin

Oregon. Department of Transportation. Research Group.

关键词: Corrosion;    Lithium Bromide;    Lithium Bromides;    Lithium Nitrates;    Zinc;   

DOI  :  10.2172/808092
RP-ID  :  DOE/ARC-TR-03-005
RP-ID  :  DOE-CRADA-6200-0961
RP-ID  :  808092

美国|英语

来源: UNT Digital Library

【 摘 要 】

Cathodic protection (CP) systems using thermal-sprayed zinc anodes are employed to mitigate the corrosion process in reinforced concrete structures. However, the performance of the anodes is improved by moisture at the anode-concrete interface. Research was conducted to investigate the effect of hydrophilic chemical additives, humectants, on the electrical performance and service life of zinc anodes. Lithium bromide and lithium nitrate were identified as feasible humectants with lithium bromide performing better under galvanic CP and lithium nitrate performing better under impressed current CP. Both humectants improved the electrical operating characteristics of the anode and increased the service life by up to three years.