Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

09207 Corrosion of Epoxy- and Polymer/Zinc- Coated Rebar in Simulated Concrete Pore Solution

Picture for 09207 Corrosion of Epoxy- and Polymer/Zinc- Coated Rebar in Simulated Concrete Pore Solution
Available for download
Product Number: 51300-09207-SG
ISBN: 09207 2009 CP
Author: Alberto Sagues and Kingsley Lau
Publication Date: 2009
$0.00
$20.00
$20.00
This work is a preliminary examination of mechanistic issues on the comparative corrosion performance of regular epoxy-coated rebar (ECR) and dual polymer-zinc coated reinforcement (DCR) in simulated concrete pore solution with and without chloride ions, at polarizations from +100 mV to -1000 mV in the saturated calomel electrode (SCE) scale and exposure periods of 1 month or longer. Both materials had intentional coating breaks exposing the base steel. Polymer adhesion degradation of DCR relative to the as-received condition was comparable to, or less than, that experienced by ECR under both anodic and cathodic polarization and with and without chloride ions. Both DCR and ECR experienced severe corrosion at breaks under strong anodic polarization with chloride ions, but distress for DCR was significantly less than for ECR. Under open circuit conditions DCR experienced an initial high activity period both in the presence and absence of chloride ions after which the open circuit potential stabilized to ~-400 mVSCE, and the exposed steel remained free of corrosion in either environment. In contrast, ECR in the presence of chlorides developed more negative open circuit potential (OCP) and visible corrosion. After the initial period of high activity, OCP consumption of the zinc exposed at the defect rim proceeded at a very low rate both in the presence or absence of chloride ions. In the absence of chloride ions and under medium to strong cathodic polarization, DCR showed cathodic current (and hence an ability to support corrosion macrocells with through-the-steel defects) no greater than that for ECR.

Keywords: epoxy, zinc, dual-coat, disbondment, rebar, corrosion
This work is a preliminary examination of mechanistic issues on the comparative corrosion performance of regular epoxy-coated rebar (ECR) and dual polymer-zinc coated reinforcement (DCR) in simulated concrete pore solution with and without chloride ions, at polarizations from +100 mV to -1000 mV in the saturated calomel electrode (SCE) scale and exposure periods of 1 month or longer. Both materials had intentional coating breaks exposing the base steel. Polymer adhesion degradation of DCR relative to the as-received condition was comparable to, or less than, that experienced by ECR under both anodic and cathodic polarization and with and without chloride ions. Both DCR and ECR experienced severe corrosion at breaks under strong anodic polarization with chloride ions, but distress for DCR was significantly less than for ECR. Under open circuit conditions DCR experienced an initial high activity period both in the presence and absence of chloride ions after which the open circuit potential stabilized to ~-400 mVSCE, and the exposed steel remained free of corrosion in either environment. In contrast, ECR in the presence of chlorides developed more negative open circuit potential (OCP) and visible corrosion. After the initial period of high activity, OCP consumption of the zinc exposed at the defect rim proceeded at a very low rate both in the presence or absence of chloride ions. In the absence of chloride ions and under medium to strong cathodic polarization, DCR showed cathodic current (and hence an ability to support corrosion macrocells with through-the-steel defects) no greater than that for ECR.

Keywords: epoxy, zinc, dual-coat, disbondment, rebar, corrosion
Product tags
Also Purchased
Picture for Epoxy coated galvanized rebars as an alternative for rebars used in concrete structures contaminated with chloride ions
Available for download

51318-11598-Epoxy coated galvanized rebars as an alternative for rebars used in concrete structures contaminated with chloride ions

Product Number: 51318-11598-SG
Author: Mayara Stecanella Pacheco / Juliana Lopes Cardoso / Adriana de Araujo / Jose Luis Serra Ribeiro / Zehbour Panossian
Publication Date: 2018
$20.00

Results of laboratory tests of dual-coated (zinc/epoxy) rebars embedded in concrete and in a concrete simulated pore solution with and without chloride contamination followed by a brief description of the adopted methodologies.

 
Picture for 09213 Service Life Forecasting for Reinforced Concrete Incorporating Potential-Dependent Chloride Th
Available for download

09213 Service Life Forecasting for Reinforced Concrete Incorporating Potential-Dependent Chloride Threshold

Product Number: 51300-09213-SG
ISBN: 09213 2009 CP
Author: S.C. Kranc, Kingsley Lau and Alberto Sagues
Publication Date: 2009
$20.00
Picture for 09224 Testing of Discrete Titanium Anodes for Cathodic Protection of Reinforced Concrete
Available for download

09224 Testing of Discrete Titanium Anodes for Cathodic Protection of Reinforced Concrete

Product Number: 51300-09224-SG
ISBN: 09224 2009 CP
Author: J. Bennett, T. Turk, M. Tettamanti, M. Manghi, and S. Tremolada
Publication Date: 2009
$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