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Microcracking in Concrete

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Interpreting microbiologically assisted cracking with E^e-pH diagrams.

Tangqing Wu¹, Cheng Sun², Wei Ke²

¹Key Laboratory of Materials Design and Preparation Technology of Hunan Province, School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, PR China; Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China.

Bioelectrochemistry (Amsterdam, Netherlands)

|November 28, 2017

Summary

Microbiologically assisted cracking (MAC) in metals like steel and copper is explained using E^e-pH diagrams. Nitrate-reducing bacteria (NRB) cause more favorable cracking than sulfate-reducing bacteria (SRB) due to nitrate

Keywords:

E(e)-pH diagram Microbiologically induced corrosion Nitrate-reducing bacteria Stress corrosion Sulfate-reducing bacteria

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Area of Science:

Corrosion Science
Microbiology
Materials Science

Background:

Mechanisms for microbiologically assisted cracking (MAC) in steel and copper lack a unified theoretical framework.
Existing theories do not fully explain the role of specific bacterial groups in material degradation.

Purpose of the Study:

To provide a theoretical interpretation for sulfate/nitrate reducing bacteria (SRB/NRB)-assisted cracking.
To elucidate the thermodynamic driving forces behind MAC in metals.

Main Methods:

Utilized E^e-pH diagrams to analyze the thermodynamic favorability of corrosion reactions.
Investigated the influence of SRB and NRB under combined bacterial action and external stress.
Compared the thermodynamic potential for cracking induced by NRB versus SRB.

Main Results:

SRB/NRB activity and external stress increase cell potential (E^cell) and corrosion current density, favoring corrosion reactions.
MAC is thermodynamically driven by these increased electrochemical potentials.
Nitrate-reducing bacteria (NRB) facilitate a more thermodynamically favorable cracking process in iron compared to sulfate-reducing bacteria (SRB).

Conclusions:

E^e-pH diagrams offer a theoretical basis for understanding SRB/NRB-assisted cracking.
The findings provide a thermodynamic explanation for MAC, applicable to pipeline steel stress corrosion cracking.