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The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels / EDWARD PURKHARDT

Swansea University Author: EDWARD PURKHARDT

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Abstract

The Critical Pitting Temperatures of Ferralium 255 (UNS S32550), Zeron 100 (UNS S32760), and SAF2507 (UNS S32750). were investigated to look at the effect of pH on the measured critical pitting temperature (CPT)and to understand the type of mechanism driving the formation and growth of the pits.Due...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Master of Research
Degree name: MSc by Research
Supervisor: Sullivan, J. H.
URI: https://cronfa.swan.ac.uk/Record/cronfa66938
first_indexed 2024-07-04T11:28:46Z
last_indexed 2024-11-25T14:19:12Z
id cronfa66938
recordtype RisThesis
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spelling 2024-07-04T12:29:44.4325290 v2 66938 2024-07-04 The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels d59bf71e4ed8ec78b490f4b834ca42ff EDWARD PURKHARDT EDWARD PURKHARDT true false 2024-07-04 The Critical Pitting Temperatures of Ferralium 255 (UNS S32550), Zeron 100 (UNS S32760), and SAF2507 (UNS S32750). were investigated to look at the effect of pH on the measured critical pitting temperature (CPT)and to understand the type of mechanism driving the formation and growth of the pits.Due to the elevated copper concentration in Ferralium alloy compared to the other alloys and, the elevated tungsten concentration in the SAF2507 (SAF)alloy compared to the alloys. The effect of copper and tungsten addition on the measured CPT could also be investigated.An investigation into the effect of the pH of the test solution on the three alloys was conducted. All three alloys underwent a CPT test sweep at 4pH, 7pH and 10pH.A clear difference was measured in the CPT of the individual alloys, they all had a measurable and notable difference in measured breakdown temperature.his consisted of the copper rich alloy (Ferralium) having an average CPT of 76oC across the three tested pH solutions. The low copper alloy (Zeron) having the next highest measured CPT of 85oC. With the tungsten rich alloy (SAF)having the highest measured CPT of 89oC.SEM imaging of the pits that formed found that the pits that had formed in all of the CPT sweeps for all of the alloys had formed a pit structure known as lacy capped pits. This cap on the pit is likely to enable concentrations of the solution on the internal of the pit to be high enough to encourage corrosion of the highly corrosion resistance super duplex stainless steels. There is no visible difference in the structure of the lacy capped pit formed in the individual alloys.Time-lapse imagery (TLI) of the samples undergoing CPT sweeps was conducted to confirm that the pits were forming after the alloy transitioned through its critical temperature. The measured CPT of the individual alloys were consistent with those measured in the previous 3 investigations. The TLI was able to capture the formations of the pits as the material transitioned through its critical temperature. It is possible that re-passivation of the pits were captured in the TLI. The re-passivation is likely to be caused by the lacy caps of the pits being removed or degrading. The loss of the cap results in the internal environment of the pit to no-longer be conducive to continuation of the corrosion reaction. E-Thesis Swansea University, Wales, UK Super duplex stainless steel, Critical pitting temperature, lacy capped pits 13 5 2024 2024-05-13 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. COLLEGE NANME COLLEGE CODE Swansea University Sullivan, J. H. Master of Research MSc by Research Langley Alloys, M2A Langley Alloys, M2A 2024-07-04T12:29:44.4325290 2024-07-04T12:15:10.3971604 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering EDWARD PURKHARDT 1 66938__30821__b1f815ad2b514950bebff14bd9301124.pdf 2023_Purkhardt_E.final.66938.pdf 2024-07-04T12:27:50.9027949 Output 3875579 application/pdf E-Thesis – open access true Copyright: The Author, Edward Purkhardt, 2023 true eng
title The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels
spellingShingle The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels
EDWARD PURKHARDT
title_short The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels
title_full The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels
title_fullStr The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels
title_full_unstemmed The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels
title_sort The Effect of Copper and Tungsten Addition of the Passivity and Pitting Corrosion Resistance of Super Duplex Stainless Steels
author_id_str_mv d59bf71e4ed8ec78b490f4b834ca42ff
author_id_fullname_str_mv d59bf71e4ed8ec78b490f4b834ca42ff_***_EDWARD PURKHARDT
author EDWARD PURKHARDT
author2 EDWARD PURKHARDT
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publishDate 2024
institution Swansea University
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
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description The Critical Pitting Temperatures of Ferralium 255 (UNS S32550), Zeron 100 (UNS S32760), and SAF2507 (UNS S32750). were investigated to look at the effect of pH on the measured critical pitting temperature (CPT)and to understand the type of mechanism driving the formation and growth of the pits.Due to the elevated copper concentration in Ferralium alloy compared to the other alloys and, the elevated tungsten concentration in the SAF2507 (SAF)alloy compared to the alloys. The effect of copper and tungsten addition on the measured CPT could also be investigated.An investigation into the effect of the pH of the test solution on the three alloys was conducted. All three alloys underwent a CPT test sweep at 4pH, 7pH and 10pH.A clear difference was measured in the CPT of the individual alloys, they all had a measurable and notable difference in measured breakdown temperature.his consisted of the copper rich alloy (Ferralium) having an average CPT of 76oC across the three tested pH solutions. The low copper alloy (Zeron) having the next highest measured CPT of 85oC. With the tungsten rich alloy (SAF)having the highest measured CPT of 89oC.SEM imaging of the pits that formed found that the pits that had formed in all of the CPT sweeps for all of the alloys had formed a pit structure known as lacy capped pits. This cap on the pit is likely to enable concentrations of the solution on the internal of the pit to be high enough to encourage corrosion of the highly corrosion resistance super duplex stainless steels. There is no visible difference in the structure of the lacy capped pit formed in the individual alloys.Time-lapse imagery (TLI) of the samples undergoing CPT sweeps was conducted to confirm that the pits were forming after the alloy transitioned through its critical temperature. The measured CPT of the individual alloys were consistent with those measured in the previous 3 investigations. The TLI was able to capture the formations of the pits as the material transitioned through its critical temperature. It is possible that re-passivation of the pits were captured in the TLI. The re-passivation is likely to be caused by the lacy caps of the pits being removed or degrading. The loss of the cap results in the internal environment of the pit to no-longer be conducive to continuation of the corrosion reaction.
published_date 2024-05-13T14:34:48Z
_version_ 1821325853851648000
score 11.564073

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