Accessing the Full Spectrum of Corrosion Behaviour of Tempered Type 420 Stainless Steel

Yiqi Zhou; Dirk Engelberg

doi:10.1002/maco.202112442

Accessing the Full Spectrum of Corrosion Behaviour of Tempered Type 420 Stainless Steel

Yiqi Zhou, Dirk Engelberg

Materials Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Bipolar electrochemistry produces a linear potential gradient between two feeder electrodes, providing access to the full spectrum of anodic-to-cathodic electrochemical behaviour. A type 420 martensitic stainless steel has been used to investigate microstructure evolution and corrosion behaviour with application of different tempering heat treatments. Tempering treatments at 250°C, 400°C and 700°C revealed the occurrence of pitting corrosion, with treatments at 550°C resulting in general and intergranular corrosion. Cr ₂₃C ₆ was present in all tempering conditions, with Cr ₇C ₃ and CrC only observed for tempering at 550°C. The 250°C tempering treatment had the highest corrosion resistance with a hardness value much higher than 500 HV.

Original language	English
Pages (from-to)	1718-1729
Number of pages	12
Journal	Materials and Corrosion
Volume	72
Issue number	11
DOIs	https://doi.org/10.1002/maco.202112442
Publication status	Published - 10 Jun 2021

Keywords

bipolar electrochemistry
chromium carbides
heat treatment
intergranular corrosion
martensitic stainless steel
pitting corrosion

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10.1002/maco.202112442Licence: CC BY

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title = "Accessing the Full Spectrum of Corrosion Behaviour of Tempered Type 420 Stainless Steel",

abstract = "Bipolar electrochemistry produces a linear potential gradient between two feeder electrodes, providing access to the full spectrum of anodic-to-cathodic electrochemical behaviour. A type 420 martensitic stainless steel has been used to investigate microstructure evolution and corrosion behaviour with application of different tempering heat treatments. Tempering treatments at 250°C, 400°C and 700°C revealed the occurrence of pitting corrosion, with treatments at 550°C resulting in general and intergranular corrosion. Cr 23C 6 was present in all tempering conditions, with Cr 7C 3 and CrC only observed for tempering at 550°C. The 250°C tempering treatment had the highest corrosion resistance with a hardness value much higher than 500 HV.",

keywords = "bipolar electrochemistry, chromium carbides, heat treatment, intergranular corrosion, martensitic stainless steel, pitting corrosion",

author = "Yiqi Zhou and Dirk Engelberg",

note = "Funding Information: The authors acknowledge the support of the Henry Royce Institute for access to the Keyence laser scanning confocal microscope and the ZEISS Sigma FEG‐SEM at EPSRC Royce@Manchester (EP/R00661X/1). Publisher Copyright: {\textcopyright} 2021 The Authors. Materials and Corrosion published by Wiley-VCH GmbH.",

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doi = "10.1002/maco.202112442",

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AU - Zhou, Yiqi

AU - Engelberg, Dirk

N1 - Funding Information: The authors acknowledge the support of the Henry Royce Institute for access to the Keyence laser scanning confocal microscope and the ZEISS Sigma FEG‐SEM at EPSRC Royce@Manchester (EP/R00661X/1). Publisher Copyright: © 2021 The Authors. Materials and Corrosion published by Wiley-VCH GmbH.

PY - 2021/6/10

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N2 - Bipolar electrochemistry produces a linear potential gradient between two feeder electrodes, providing access to the full spectrum of anodic-to-cathodic electrochemical behaviour. A type 420 martensitic stainless steel has been used to investigate microstructure evolution and corrosion behaviour with application of different tempering heat treatments. Tempering treatments at 250°C, 400°C and 700°C revealed the occurrence of pitting corrosion, with treatments at 550°C resulting in general and intergranular corrosion. Cr 23C 6 was present in all tempering conditions, with Cr 7C 3 and CrC only observed for tempering at 550°C. The 250°C tempering treatment had the highest corrosion resistance with a hardness value much higher than 500 HV.

AB - Bipolar electrochemistry produces a linear potential gradient between two feeder electrodes, providing access to the full spectrum of anodic-to-cathodic electrochemical behaviour. A type 420 martensitic stainless steel has been used to investigate microstructure evolution and corrosion behaviour with application of different tempering heat treatments. Tempering treatments at 250°C, 400°C and 700°C revealed the occurrence of pitting corrosion, with treatments at 550°C resulting in general and intergranular corrosion. Cr 23C 6 was present in all tempering conditions, with Cr 7C 3 and CrC only observed for tempering at 550°C. The 250°C tempering treatment had the highest corrosion resistance with a hardness value much higher than 500 HV.

KW - bipolar electrochemistry

KW - chromium carbides

KW - heat treatment

KW - intergranular corrosion

KW - martensitic stainless steel

KW - pitting corrosion

U2 - 10.1002/maco.202112442

DO - 10.1002/maco.202112442

M3 - Article

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VL - 72

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JO - Materials and Corrosion

JF - Materials and Corrosion

IS - 11

ER -

Accessing the Full Spectrum of Corrosion Behaviour of Tempered Type 420 Stainless Steel

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