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B.W.A. Sherar
University of Western Ontario
10Publications
6H-index
188Citations
Publications 10
Newest
#1B.W.A. SherarH-Index: 6
#2Peter G. Keech (Nuclear Waste Management Organization)H-Index: 16
Last.D.W. Shoesmith (UWO: University of Western Ontario)H-Index: 26
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Abstract The aerobic corrosion of pipeline steel was investigated in an aqueous sulfide solution by monitoring the corrosion potential and periodically measuring the polarization resistance. The properties and composition of the corrosion product deposits formed were determined using scanning electron microscopy, energy dispersive X-ray analysis, and Raman spectroscopy. The establishment of aerobic conditions leads to corrosion and (oxyhydr)oxide deposition beneath the anaerobically-formed macki...
4 CitationsSource
#1B.W.A. SherarH-Index: 6
#2Peter G. Keech (Nuclear Waste Management Organization)H-Index: 16
Last.D.W. Shoesmith (UWO: University of Western Ontario)H-Index: 26
view all 3 authors...
Severe corrosion damage may occur when gas transmission pipelines are exposed, at disbonded coating locations, to trapped waters containing sulfide followed by secondary exposure to air. Aerobic corrosion with sulfide was investigated in a long-term corrosion experiment in which corrosion was monitored by measurement of the corrosion potential and polarization resistance obtained from linear polarization resistance measurements. The properties and composition of the corrosion product deposits fo...
16 CitationsSource
#1B.W.A. SherarH-Index: 6
#2Peter G. Keech (Nuclear Waste Management Organization)H-Index: 16
Last.D. W. Shoesmith (UWO: University of Western Ontario)H-Index: 9
view all 5 authors...
Severe corrosion damage may occur when gas transmission pipelines are exposed, at disbonded coating locations, to trapped waters containing sulfide. This scenario has been investigated in long-term...
11 CitationsSource
#1B.W.A. SherarH-Index: 6
#2Peter G. Keech (UWO: University of Western Ontario)H-Index: 16
Last.D.W. Shoesmith (UWO: University of Western Ontario)H-Index: 26
view all 3 authors...
Abstract A corrosion mechanism has been developed to describe tubercle formation along pipeline steels during successive anaerobic–aerobic cycles. Small concentrations of O 2 under nominally anaerobic conditions can lead to the separation of anodes and cathodes. Under subsequent aerobic conditions localized corrosion is then promoted by O 2 reduction on the general magnetite-covered surface. Subsequently, the conversion of magnetite to maghemite passivates the general surface, and focuses corros...
19 CitationsSource
#1B.W.A. SherarH-Index: 6
#2Peter G. Keech (UWO: University of Western Ontario)H-Index: 16
Last.D.W. Shoesmith (UWO: University of Western Ontario)H-Index: 26
view all 3 authors...
Abstract The influence of anaerobic–aerobic cycling on pipeline steel corrosion was investigated in near-neutral carbonate/sulphate/chloride solution (pH 9) over 238 days. The corrosion rate increased and decreased as exposure conditions were switched between redox conditions. Two distinct corrosion morphologies were observed. The majority of the surface corroded uniformly to produce a black magnetite/maghemite layer approximately 4.5 μm thick. The remaining surface was covered with an orange tu...
30 CitationsSource
#1B.W.A. Sherar (UWO: University of Western Ontario)H-Index: 6
#2Ian M. Power (UWO: University of Western Ontario)H-Index: 20
Last.David W. Shoesmith (UWO: University of Western Ontario)H-Index: 27
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Abstract This article compares the electrochemical effects induced by inorganic sulfide and sulfate reducing bacteria on the corrosion of carbon steel – a subject of concern for pipelines. Biological microcosms, containing varying concentrations of bioorganic content, were studied to investigate changes to the morphology of biofilms and corrosion product deposits. Raman analysis indicated mackinawite (FeS 1− x ) was the dominant iron sulfide phase grown both abiotically and biotically. A fascina...
88 CitationsSource
#1B.W.A. SherarH-Index: 6
#2Peter G. KeechH-Index: 16
Last.D. W. ShoesmithH-Index: 9
view all 5 authors...
Abstract Gas transmission pipeline corrosion commences when coatings disbond, exposing the steel to groundwater. When this occurs, a number of anaerobic and aerobic corrosion scenarios can be envisaged. The initial nominally anaerobic corrosion period has been investigated by applying a combination of electrochemical methods (i.e., corrosion potential, linear polarization resistance, and electrochemical impedance spectroscopy [EIS] measurements) and surface analytical techniques (scanning electr...
19 CitationsSource
#1B.W.A. Sherar (UWO: University of Western Ontario)H-Index: 6
#2Peter G. Keech (UWO: University of Western Ontario)H-Index: 16
Last.Robert WorthinghamH-Index: 5
view all 6 authors...
This paper investigates the long term corrosion behaviour of pretreated carbon steel under alternating anaerobic to aerobic cycles over 238 days. Changes in steel behaviour were observed electrochemically by monitoring the corrosion potential, and calculating changes to corrosion rate from linear polarization resistance. With increasing cycle number the corrosion process becomes localized at a small number of locations, consistent with the formation of tubercles. Periods of aerobic corrosion wer...
Source
#1Dmitrij ZagidulinH-Index: 7
#2Pellumb JakupiH-Index: 13
Last.David W. ShoesmithH-Index: 20
view all 5 authors...
1 CitationsSource
#1Dmitrij ZagidulinH-Index: 7
#2B.W.A. SherarH-Index: 6
Last.David W. ShoesmithH-Index: 20
view all 5 authors...
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