On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel
Bipolar electrochemistry has been applied to Type 420 ferritic stainless steel in order to determine the full spectrum of anodic-to-cathodic polarisation behaviour. The occurrence of crevice corrosion, pitting corrosion in combination with general corrosion, pitting corrosion only, general corrosion...
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| Language: | English |
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MDPI AG
2020-06-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/6/794 |
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doaj-837b38ab3a134455b88fc9ba87a8bb9f2020-11-25T03:06:15ZengMDPI AGMetals2075-47012020-06-011079479410.3390/met10060794On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless SteelYiqi Zhou0Dirk Lars Engelberg1Corrosion & Protection Centre, Department of Materials, School of Natural Sciences, The University of Manchester, Manchester M13 9PL, UKCorrosion & Protection Centre, Department of Materials, School of Natural Sciences, The University of Manchester, Manchester M13 9PL, UKBipolar electrochemistry has been applied to Type 420 ferritic stainless steel in order to determine the full spectrum of anodic-to-cathodic polarisation behaviour. The occurrence of crevice corrosion, pitting corrosion in combination with general corrosion, pitting corrosion only, general corrosion only, followed by a cathodic region has been observed. Instances of pitting corrosion initiated near chromium-rich carbides with Cr<sub>23</sub>C<sub>6</sub>, Cr<sub>3</sub>C<sub>2</sub>, and Cr<sub>7</sub>C<sub>3</sub> identified as pit nucleation sites. The observed pit growth kinetics were independent of the electrochemical over-potential. Characterisation of the pit size distributions supports the presence of a critical dissolved volume for the transition of metastable to stable pit growth and pit coalescence.https://www.mdpi.com/2075-4701/10/6/794stainless steelbipolar electrochemistrypitting corrosionchromium carbidespit growth factor |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Yiqi Zhou Dirk Lars Engelberg |
| spellingShingle |
Yiqi Zhou Dirk Lars Engelberg On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel Metals stainless steel bipolar electrochemistry pitting corrosion chromium carbides pit growth factor |
| author_facet |
Yiqi Zhou Dirk Lars Engelberg |
| author_sort |
Yiqi Zhou |
| title |
On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel |
| title_short |
On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel |
| title_full |
On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel |
| title_fullStr |
On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel |
| title_full_unstemmed |
On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel |
| title_sort |
on the application of bipolar electrochemistry to characterise the localised corrosion behaviour of type 420 ferritic stainless steel |
| publisher |
MDPI AG |
| series |
Metals |
| issn |
2075-4701 |
| publishDate |
2020-06-01 |
| description |
Bipolar electrochemistry has been applied to Type 420 ferritic stainless steel in order to determine the full spectrum of anodic-to-cathodic polarisation behaviour. The occurrence of crevice corrosion, pitting corrosion in combination with general corrosion, pitting corrosion only, general corrosion only, followed by a cathodic region has been observed. Instances of pitting corrosion initiated near chromium-rich carbides with Cr<sub>23</sub>C<sub>6</sub>, Cr<sub>3</sub>C<sub>2</sub>, and Cr<sub>7</sub>C<sub>3</sub> identified as pit nucleation sites. The observed pit growth kinetics were independent of the electrochemical over-potential. Characterisation of the pit size distributions supports the presence of a critical dissolved volume for the transition of metastable to stable pit growth and pit coalescence. |
| topic |
stainless steel bipolar electrochemistry pitting corrosion chromium carbides pit growth factor |
| url |
https://www.mdpi.com/2075-4701/10/6/794 |
| work_keys_str_mv |
AT yiqizhou ontheapplicationofbipolarelectrochemistrytocharacterisethelocalisedcorrosionbehaviouroftype420ferriticstainlesssteel AT dirklarsengelberg ontheapplicationofbipolarelectrochemistrytocharacterisethelocalisedcorrosionbehaviouroftype420ferriticstainlesssteel |
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1724674333770514432 |