Evaluating the Use of Phosphate to Mitigate Caustic-PbSCC of Alloy 690TT

Giulia Mazzei; Jonathan Duff; D. A. Horner; M. Grace Burke; Fabio Scenini

Evaluating the Use of Phosphate to Mitigate Caustic-PbSCC of Alloy 690TT

Giulia Mazzei, Jonathan Duff, D. A. Horner, M. Grace Burke, Fabio Scenini

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

Abstract

Phosphate additions to Pb-caustic water chemistry were investigated as possible avenue to mitigate against caustic Lead-Assisted Stress Corrosion Cracking (PbSCC) of Alloy 690TT at around 310°C. Dosing with 1,700 ppm of phosphate promoted a small beneficial effect in PbSCC resistance. However, with 3,000 ppm of phosphate, mitigation was only achieved for as received surfaces, whilst polished surfaces displayed localized attack. Advanced materials characterization revealed that a similar crack tip composition was generated in different solutions. It is suggested that phosphate decreased the PbSCC kinetics by partly sequestering Pb from the bulk environment, although not below the threshold value required to prevent cracking.

Original language	English
Title of host publication	The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor
Publication status	Accepted/In press - 1 Jul 2022
Event	The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor - , United States Duration: 17 Jul 2022 → 21 Jul 2022

Conference

Conference	The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor
Country/Territory	United States
Period	17/07/22 → 21/07/22

Embargoed Document

Evaluating the use of Phosphate to mitigate PbSCC - final
Accepted author manuscript, 1.78 MB
Embargo ends: 1/01/32

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@inproceedings{03602b5905b64e67a7eea22a36d18a01,

title = "Evaluating the Use of Phosphate to Mitigate Caustic-PbSCC of Alloy 690TT",

abstract = "Phosphate additions to Pb-caustic water chemistry were investigated as possible avenue to mitigate against caustic Lead-Assisted Stress Corrosion Cracking (PbSCC) of Alloy 690TT at around 310°C. Dosing with 1,700 ppm of phosphate promoted a small beneficial effect in PbSCC resistance. However, with 3,000 ppm of phosphate, mitigation was only achieved for as received surfaces, whilst polished surfaces displayed localized attack. Advanced materials characterization revealed that a similar crack tip composition was generated in different solutions. It is suggested that phosphate decreased the PbSCC kinetics by partly sequestering Pb from the bulk environment, although not below the threshold value required to prevent cracking.",

author = "Giulia Mazzei and Jonathan Duff and Horner, {D. A.} and Burke, {M. Grace} and Fabio Scenini",

year = "2022",

month = jul,

day = "1",

language = "English",

booktitle = "The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor",

note = "The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor ; Conference date: 17-07-2022 Through 21-07-2022",

}

Mazzei, G, Duff, J, Horner, DA, Burke, MG & Scenini, F 2022, Evaluating the Use of Phosphate to Mitigate Caustic-PbSCC of Alloy 690TT. in The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor. The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor, Colorado, United States, 17/07/22.

TY - GEN

T1 - Evaluating the Use of Phosphate to Mitigate Caustic-PbSCC of Alloy 690TT

AU - Mazzei, Giulia

AU - Duff, Jonathan

AU - Horner, D. A.

AU - Burke, M. Grace

AU - Scenini, Fabio

PY - 2022/7/1

Y1 - 2022/7/1

N2 - Phosphate additions to Pb-caustic water chemistry were investigated as possible avenue to mitigate against caustic Lead-Assisted Stress Corrosion Cracking (PbSCC) of Alloy 690TT at around 310°C. Dosing with 1,700 ppm of phosphate promoted a small beneficial effect in PbSCC resistance. However, with 3,000 ppm of phosphate, mitigation was only achieved for as received surfaces, whilst polished surfaces displayed localized attack. Advanced materials characterization revealed that a similar crack tip composition was generated in different solutions. It is suggested that phosphate decreased the PbSCC kinetics by partly sequestering Pb from the bulk environment, although not below the threshold value required to prevent cracking.

AB - Phosphate additions to Pb-caustic water chemistry were investigated as possible avenue to mitigate against caustic Lead-Assisted Stress Corrosion Cracking (PbSCC) of Alloy 690TT at around 310°C. Dosing with 1,700 ppm of phosphate promoted a small beneficial effect in PbSCC resistance. However, with 3,000 ppm of phosphate, mitigation was only achieved for as received surfaces, whilst polished surfaces displayed localized attack. Advanced materials characterization revealed that a similar crack tip composition was generated in different solutions. It is suggested that phosphate decreased the PbSCC kinetics by partly sequestering Pb from the bulk environment, although not below the threshold value required to prevent cracking.

M3 - Conference contribution

BT - The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor

T2 - The 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor

Y2 - 17 July 2022 through 21 July 2022

ER -

Evaluating the Use of Phosphate to Mitigate Caustic-PbSCC of Alloy 690TT

Abstract

Conference

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