Effects of H2S and pH on Tafel slopes in electrochemical corrosion of high strength carbon steel S-135 in alkaline brines

R. Feng; J. Beck; M. Ziomek-Moroz; S. N. Lvov

doi:10.1149/07217.0059ecst

Effects of H₂S and pH on Tafel slopes in electrochemical corrosion of high strength carbon steel S-135 in alkaline brines

R. Feng, J. Beck, M. Ziomek-Moroz, S. N. Lvov

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Scopus citations

Abstract

Effects of H₂S and pH on electrochemical corrosion of high-strength low-alloy carbon steel, Grade S-135, were investigated through Tafel slopes. Linear sweep voltammetry (LSV) was conducted in 5 %wt. NaCl solutions of pH 7.9, 10.7, and 12.4 with four H₂S partial pressures (pH₂S) ranging from 0 to 69 kPa at 85 oC after 60 hours of exposure. Anodic limiting current was observed without H₂S, but disappeared at higher pH₂S. Cathodic LSV plots did not show limiting currents, suggesting that H2O was the main reactant for the hydrogen evolution reaction at high pH. Both anodic and cathodic currents increased at 69 kPa pH₂S compared to 0 kPa. Electrochemical reaction mechanisms were discussed based on anodic and cathodic Tafel slopes. The Tafel slopes from LSV were generally larger than those obtained from electrochemical frequency modulation. Different Tafel slopes could result in a discrepancy in corrosion rate by a factor of 5.

Original language	English (US)
Title of host publication	Corrosion General Session
Editors	R. G. Buchheit, S. Virtanen
Publisher	Electrochemical Society Inc.
Pages	59-71
Number of pages	13
Edition	17
ISBN (Electronic)	9781607687443
ISBN (Print)	9781623323868
DOIs	https://doi.org/10.1149/07217.0059ecst
State	Published - 2016
Event	Corrosion General Session - 229th ECS Meeting - San Diego, United States Duration: May 29 2016 → Jun 2 2016

Publication series

Name	ECS Transactions
Number	17
Volume	72
ISSN (Print)	1938-6737
ISSN (Electronic)	1938-5862

Other

Other	Corrosion General Session - 229th ECS Meeting
Country/Territory	United States
City	San Diego
Period	5/29/16 → 6/2/16

All Science Journal Classification (ASJC) codes

General Engineering

Access to Document

10.1149/07217.0059ecst

Cite this

Feng, R., Beck, J., Ziomek-Moroz, M., & Lvov, S. N. (2016). Effects of H₂S and pH on Tafel slopes in electrochemical corrosion of high strength carbon steel S-135 in alkaline brines. In R. G. Buchheit, & S. Virtanen (Eds.), Corrosion General Session (17 ed., pp. 59-71). (ECS Transactions; Vol. 72, No. 17). Electrochemical Society Inc.. https://doi.org/10.1149/07217.0059ecst

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title = "Effects of H2S and pH on Tafel slopes in electrochemical corrosion of high strength carbon steel S-135 in alkaline brines",

abstract = "Effects of H2S and pH on electrochemical corrosion of high-strength low-alloy carbon steel, Grade S-135, were investigated through Tafel slopes. Linear sweep voltammetry (LSV) was conducted in 5 %wt. NaCl solutions of pH 7.9, 10.7, and 12.4 with four H2S partial pressures (pH2S) ranging from 0 to 69 kPa at 85 oC after 60 hours of exposure. Anodic limiting current was observed without H2S, but disappeared at higher pH2S. Cathodic LSV plots did not show limiting currents, suggesting that H2O was the main reactant for the hydrogen evolution reaction at high pH. Both anodic and cathodic currents increased at 69 kPa pH2S compared to 0 kPa. Electrochemical reaction mechanisms were discussed based on anodic and cathodic Tafel slopes. The Tafel slopes from LSV were generally larger than those obtained from electrochemical frequency modulation. Different Tafel slopes could result in a discrepancy in corrosion rate by a factor of 5.",

author = "R. Feng and J. Beck and M. Ziomek-Moroz and Lvov, {S. N.}",

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Feng, R, Beck, J, Ziomek-Moroz, M & Lvov, SN 2016, Effects of H₂S and pH on Tafel slopes in electrochemical corrosion of high strength carbon steel S-135 in alkaline brines. in RG Buchheit & S Virtanen (eds), Corrosion General Session. 17 edn, ECS Transactions, no. 17, vol. 72, Electrochemical Society Inc., pp. 59-71, Corrosion General Session - 229th ECS Meeting, San Diego, United States, 5/29/16. https://doi.org/10.1149/07217.0059ecst

Effects of H₂S and pH on Tafel slopes in electrochemical corrosion of high strength carbon steel S-135 in alkaline brines. / Feng, R.; Beck, J.; Ziomek-Moroz, M. et al.
Corrosion General Session. ed. / R. G. Buchheit; S. Virtanen. 17. ed. Electrochemical Society Inc., 2016. p. 59-71 (ECS Transactions; Vol. 72, No. 17).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T1 - Effects of H2S and pH on Tafel slopes in electrochemical corrosion of high strength carbon steel S-135 in alkaline brines

AU - Feng, R.

AU - Beck, J.

AU - Ziomek-Moroz, M.

AU - Lvov, S. N.

N1 - Publisher Copyright: © The Electrochemical Society.

PY - 2016

Y1 - 2016

N2 - Effects of H2S and pH on electrochemical corrosion of high-strength low-alloy carbon steel, Grade S-135, were investigated through Tafel slopes. Linear sweep voltammetry (LSV) was conducted in 5 %wt. NaCl solutions of pH 7.9, 10.7, and 12.4 with four H2S partial pressures (pH2S) ranging from 0 to 69 kPa at 85 oC after 60 hours of exposure. Anodic limiting current was observed without H2S, but disappeared at higher pH2S. Cathodic LSV plots did not show limiting currents, suggesting that H2O was the main reactant for the hydrogen evolution reaction at high pH. Both anodic and cathodic currents increased at 69 kPa pH2S compared to 0 kPa. Electrochemical reaction mechanisms were discussed based on anodic and cathodic Tafel slopes. The Tafel slopes from LSV were generally larger than those obtained from electrochemical frequency modulation. Different Tafel slopes could result in a discrepancy in corrosion rate by a factor of 5.

AB - Effects of H2S and pH on electrochemical corrosion of high-strength low-alloy carbon steel, Grade S-135, were investigated through Tafel slopes. Linear sweep voltammetry (LSV) was conducted in 5 %wt. NaCl solutions of pH 7.9, 10.7, and 12.4 with four H2S partial pressures (pH2S) ranging from 0 to 69 kPa at 85 oC after 60 hours of exposure. Anodic limiting current was observed without H2S, but disappeared at higher pH2S. Cathodic LSV plots did not show limiting currents, suggesting that H2O was the main reactant for the hydrogen evolution reaction at high pH. Both anodic and cathodic currents increased at 69 kPa pH2S compared to 0 kPa. Electrochemical reaction mechanisms were discussed based on anodic and cathodic Tafel slopes. The Tafel slopes from LSV were generally larger than those obtained from electrochemical frequency modulation. Different Tafel slopes could result in a discrepancy in corrosion rate by a factor of 5.

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M3 - Conference contribution

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T3 - ECS Transactions

SP - 59

EP - 71

BT - Corrosion General Session

A2 - Buchheit, R. G.

A2 - Virtanen, S.

PB - Electrochemical Society Inc.

T2 - Corrosion General Session - 229th ECS Meeting

Y2 - 29 May 2016 through 2 June 2016

ER -