Effects of differential oxygen access on the corrosion behavior of zinc relevant to mechanically stabilized earth walls

Victor Padilla, Akram Alfantazi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

In the past years the performance of Mechanically Stabilized Earth walls (MSE walls) have raised some controversy due to early failure at some locations. This has been attributed to aggressive environments. The purpose of this paper is to study the effect of differential oxygen access on the corrosion performance of zinc, the most common material used as protection system on MSE walls. Uneven soil compaction creates differential oxygen access, which is expected to promote corrosion macrocells that will compromise the performance of the structure. High purity zinc (99.6 wt%) was immersed in solutions with varied concentration of Na2SO4 to simulate the conditions found in soils and ground water, while the concentration of NaCl was kept at 3.5 wt%. Corrosion rates were measured using potentiodynamic polarization testing in different concentrations of oxygen, and Scanning Electron Microscope (SEM), and X-Ray Diffraction (XRD) were used to characterize the corroded samples. Results indicate an increase on the corrosion rate with increasing amount of Na2SO4, as well as a potential difference between samples in oxygen saturated, aerated and de-aerated conditions indicating the possibility for macrocell formation under the studied conditions.

Original languageBritish English
Title of host publicationTMS 2011 - 140th Annual Meeting and Exhibition, Supplemental Proceedings
Pages395-403
Number of pages9
StatePublished - 2011
EventTMS 2011 - 140th Annual Meeting and Exhibition - San Diego, CA, United States
Duration: 27 Feb 20113 Mar 2011

Publication series

NameTMS Annual Meeting
Volume3

Conference

ConferenceTMS 2011 - 140th Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySan Diego, CA
Period27/02/113/03/11

Keywords

  • Corrosion
  • Mechanically stabilized earth walls
  • Zinc

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