Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions

Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions

Bibliographic Details
Main Author: Ieamsupapong, Supat
Language:English
Published: Ohio University / OhioLINK 2016
Subjects:
Chemical Engineering
iron carbonate
mild steel
controlled water chemistry conditions
iron carbide
environmental parameters
FeCO3 saturation value
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1473264400862079
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou14732644008620792021-08-03T06:38:43Z Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions Ieamsupapong, Supat, Chemical Engineering iron carbonate mild steel controlled water chemistry conditions iron carbide environmental parameters FeCO3 saturation value Degradation of metals associated with hydrocarbon production, combustion processes, and carbon capture is a pernicious problem in the energy sector. Consequently, laboratory simulation of CO2-containing aqueous environments is of vital importance for the study of steel corrosion. However, discrepancies between predicted, experimental, and field corrosion rate data in a midrange of operating parameters have been reported. These discoveries necessitate improving the accuracy of corrosion prediction models. Based upon preliminary experiments, iron carbonate formation near its saturation condition was identified as a major factor observed corrosion rate discrepancies. Therefore, it is imperative to conduct a systematic study to gain more understanding of corrosion product layer formation mechanisms in controlled water chemistry conditions. Small scale CO2 corrosion experiments have lacked control of pH and ferrous ion concentration, potentially creating misleading conditions related to the growth of protective iron carbonate (FeCO3). An improved experimental apparatus to study steel corrosion and associated formation of FeCO3 was developed. The design incorporates a flow-through system, enabling control of water chemistry, and newly developed sample holders that eliminate non-uniformity of flow associated with hanging samples as well as centrifugal effects associated with rotating cylinder electrodes. Corrosion experiments were conducted in a conventional glass cell and the newly developed flow-through system. Significantly different corrosion product morphologies were observed in these different systems. In controlled water chemistry conditions, iron carbide (Fe3C) was found to play a crucial role in the development of the corrosion product as it provided a favorable environment for the formation of a FeCO3 layer at the steel surface.Three different kinds of material (X65 with tempered-martensitic microstructure, C1018 with ferritic-pearlitic microstructure, and 99.8% pure iron) were used to confirm the influence of iron carbide on the formation of corrosion products near saturation conditions. It was found that in the absence of iron carbide (Fe3C), pure iron produced no significant FeCO3 formation under the same operating conditions as the tests conducted on mild steels.Environmental parameters relating to the effect of FeCO3 saturation value, solution pH, and temperature on the formation of corrosion product layers were also investigated. Saturation value conferred the strongest effect on FeCO3 layer formation near saturation conditions among the three environmental parameters explored. 2016 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1473264400862079 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1473264400862079 restricted--full text unavailable until 2024-01-01 This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Chemical Engineering
iron carbonate
mild steel
controlled water chemistry conditions
iron carbide
environmental parameters
FeCO3 saturation value
spellingShingle Chemical Engineering
iron carbonate
mild steel
controlled water chemistry conditions
iron carbide
environmental parameters
FeCO3 saturation value
Ieamsupapong, Supat,
Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions
author Ieamsupapong, Supat,
author_facet Ieamsupapong, Supat,
author_sort Ieamsupapong, Supat,
title Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions
title_short Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions
title_full Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions
title_fullStr Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions
title_full_unstemmed Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions
title_sort mechanisms of iron carbonate formation on mild steel in controlled water chemistry conditions
publisher Ohio University / OhioLINK
publishDate 2016
url http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1473264400862079
work_keys_str_mv AT ieamsupapongsupat mechanismsofironcarbonateformationonmildsteelincontrolledwaterchemistryconditions
_version_ 1719440817834164224

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