Effect of Concentration and Temperature of Ethanol in Fuel Blends on Microbial and Stress Corrosion Cracking of High-Strength Steel

Jain, Luke; Mishra, Brajendra; Olson, David L.; Spear, John R.; Williamson, Chase; Weeks, Timothy; Sowards, Jeff; Kane, Russell D.; Colorado School of Mines. Center for Welding, Joining and Coatings Research; National Institute of Standards and Technology (U.S.); iCorrosion, LLC

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Effect of Concentration and Temperature of Ethanol in Fuel Blends on Microbial and Stress Corrosion Cracking of High-Strength Steel

2012-02-01
By Jain, Luke ; Mishra, Brajendra ; Olson, David L. ; ...

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Creators:

Jain, Luke ; Mishra, Brajendra ; Olson, David L. ; Spear, John R. ; Williamson, Chase ; ... More +

Jain, Luke ; Mishra, Brajendra ; Olson, David L. ; Spear, John R. ; Williamson, Chase ; Weeks, Timothy ; Sowards, Jeff ; Kane, Russell D. Less -
Corporate Creators:

Colorado School of Mines. Center for Welding, Joining and Coatings Research ; National Institute of Standards and Technology (U.S.) ; iCorrosion, LLC

Colorado School of Mines. Center for Welding, Joining and Coatings Research ; National Institute of Standards and Technology (U.S.) ; iCorrosion, LLC Less -
Corporate Contributors:

United States. Dept. of Transportation. Pipeline and Hazardous Materials Safety Administration
Subject/TRT Terms:

[+]

Biodeterioration Cracking Electrochemical Corrosion Ethanol Fuel Mixtures High Strength Steel Laboratory Tests Maintenance And Preservation Microbiologically Influenced Corrosion Pipelines Research Hub Steel Pipe Stress Corrosion
Publication/ Report Number:

CSM/MT/CWJCR/2012/002
Resource Type:

Tech Report
Geographical Coverage:

United States
TRIS Online Accession Number:

01640830
Edition:

Final Report
Corporate Publisher:

Colorado School of Mines. Center for Welding, Joining and Coatings Research
Abstract:

Localized environments in fuel grade ethanol (FGE) transportation systems, where conditions are suitable for growth, may allow for microbiologically influenced corrosion (MIC) of steel components. Interstate pipeline transportation of ethanol fuels increases the potential impact of a MIC related failure. A laboratory MIC investigation is presented to evaluate the potential for increased susceptibility of linepipe steels to MIC when low concentrations of ethanol are present. This research is supported by a microbiological field survey of FGE infrastructure. Acetic acid producing bacteria (APB) and a sulfate reducing bacterial (SRB) consortium are isolated from a failed storage tank used to capture ethanol spillage and runoff water at a fueling terminal. Electrochemical corrosion testing and electron microscopy is applied to study MIC of API X52 and API X70 linepipe steels by these isolated bacteria. Electrochemical techniques including open circuit potential (OCP), polarization resistance (PR), and electrochemical impedance spectroscopy (EIS) evaluate corrosion kinetics and electrochemical properties of the steel-solution interface. Scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) are applied to study corrosion products and morphology. Qualitative MIC models are presented to explain corrosion mechanisms operating in the experimental systems. A multi-specimen four-point bend testing (MSBT) method is developed to screen for crack initiation and reductions in mechanical properties due to microbially influenced embrittlement. Electrochemical corrosion data indicate acceleration of steel corrosion rates due to SRB in ethanol and acetic acid environments. Localized corrosion is identified on API X52 and X70 steels exposed to APB and on API X70 exposed to SRB. Neither cracking nor reduction of mechanical properties was identified on either steel in either environment.
Format:

PDF
Funding:

USDOT-PHMSA Project No. DTPH56-08-T-000014
Collection(s):

PHMSA Collection US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:b2dba52b405e819d00678f9e5df5b5e566d89e19829a05469fb81e67ac664073
Download URL:

https://rosap.ntl.bts.gov/view/dot/34631/dot_34631_DS1.pdf
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Effect of Concentration and Temperature of Ethanol in Fuel Blends on Microbial and Stress Corrosion Cracking of High-Strength Steel

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