Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

08055 Can Zinc Prevent Corrosion of Pre-Stressed Concrete Cylinder Pipe in High Resistivity Soils?

Picture for 08055 Can Zinc Prevent Corrosion of Pre-Stressed Concrete Cylinder Pipe in High Resistivity Soils?
Available for download
Product Number: 51300-08055-SG
ISBN: 08055 2008 CP
Author: Faraj A. Garman
Publication Date: 2008
$0.00
$20.00
$20.00
Zinc sacrificial anodes are not generally recommended to be used for the protection of steel in high resistivity soils (> 1500 O.em) as the driving potential of the zinc will not be sufficient to provide the required current needed to drive the structure to soil potential to the protection criterion of -850 mV \V.Lt. CulCuS04. This criterion guarantees that the structure potential is shifted from the active region to the immunity region of the potential-pH diagram, where the corrosion process is to be completely halted. Generally, more than 300 mY of negative shift is required. Steel in concrete however, is in the passive region due to the alkaline environment provided by the concrete surrounding which allows the steel surface to develop a protective iron oxide film. Ingress of some species such as chloride ions leads to the destruction of this protective film and pitting of the steel reinforcement initiates. Potential of the steel in concrete is relatively less negative (generally <-200mV) especially if the film damaging species have not reached the steel/concrete interface.
Zinc sacrificial anodes are not generally recommended to be used for the protection of steel in high resistivity soils (> 1500 O.em) as the driving potential of the zinc will not be sufficient to provide the required current needed to drive the structure to soil potential to the protection criterion of -850 mV \V.Lt. CulCuS04. This criterion guarantees that the structure potential is shifted from the active region to the immunity region of the potential-pH diagram, where the corrosion process is to be completely halted. Generally, more than 300 mY of negative shift is required. Steel in concrete however, is in the passive region due to the alkaline environment provided by the concrete surrounding which allows the steel surface to develop a protective iron oxide film. Ingress of some species such as chloride ions leads to the destruction of this protective film and pitting of the steel reinforcement initiates. Potential of the steel in concrete is relatively less negative (generally <-200mV) especially if the film damaging species have not reached the steel/concrete interface.
Product tags
Also Purchased
Picture for 06163 CATHODIC PROTECTION OF PIPELINES
Available for download

06163 CATHODIC PROTECTION OF PIPELINES IN HIGH RESISTIVITY SOILS AND THE EFFECT OF SEASONAL CHANGES

Product Number: 51300-06163-SG
ISBN: 06163 2006 CP
Author: Fraser King, Greg Van Boven, P, Nichols, Rod Reid, Kurt Lawson and Neil Thompson
Publication Date: 2006
$20.00

The effect of seasonal changes on the protection of pipelines in high-resistivity soil. The nature and magnitude of the seasonal fluctuations. Corrosion rates are low even when compliance with a given CP criterion cannot be demonstrated.
Picture for 08054 Evaluation of 100 mV Development/Decay Criteria on 4 meter Diameter Prestressed Concrete Cylin
Available for download

08054 Evaluation of 100 mV Development/Decay Criteria on 4 meter Diameter Prestressed Concrete Cylinder Pipeline

Product Number: 51300-08054-SG
ISBN: 08054 2008 CP
Author: Reafat Elaish, Omran Abuazza, and Khalefa Enawaa
Publication Date: 2008
$20.00
Picture for 97582 ADVANTAGES OF CONTINUOUS
Available for download

97582 ADVANTAGES OF CONTINUOUS IMPRESSED CURRENT ANODES IN HIGH RESISTIVITY SOIL ENVIRONMENTS

Product Number: 51300-97582-SG
ISBN: 97582 1997 CP
Author: William F. Marshal, David D. Smith, James F. Fluharty
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support