Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings
Chlorine-induced corrosion of HVAF-sprayed Ni21Cr and Ni5Al coatings was investigated in 5 vol.% O2 + 500vppm HCl + N2 with and without KCl at 600 °C up to 168 h. Both coatings were protective in the absence of KCl. With KCl, Ni21Cr degraded through a two-stage mechanism: 1) formation of K2CrO4 foll...
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Elsevier
2018
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| Online Access: | https://eprints.nottingham.ac.uk/49692/ |
| _version_ | 1848798056605024256 |
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| author | Sadeghimeresht, Esmaeil Reddy, Liam Hussain, Tanvir Markocsan, Nicolaie Joshi, Shrikant |
| author_facet | Sadeghimeresht, Esmaeil Reddy, Liam Hussain, Tanvir Markocsan, Nicolaie Joshi, Shrikant |
| author_sort | Sadeghimeresht, Esmaeil |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Chlorine-induced corrosion of HVAF-sprayed Ni21Cr and Ni5Al coatings was investigated in 5 vol.% O2 + 500vppm HCl + N2 with and without KCl at 600 °C up to 168 h. Both coatings were protective in the absence of KCl. With KCl, Ni21Cr degraded through a two-stage mechanism: 1) formation of K2CrO4 followed by diffusion of Cl− through the oxide grain boundaries to yield chlorine and a non-protective oxide, and 2) inward diffusion of chlorine though defects in the non-protective oxide, leading to breakaway oxidation. Cl−/Cl2 could not diffuse through the protective alumina scale formed on Ni5Al, hence the corrosion resistance increased. |
| first_indexed | 2025-11-14T20:13:42Z |
| format | Article |
| id | nottingham-49692 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T20:13:42Z |
| publishDate | 2018 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-496922018-12-28T04:30:15Z https://eprints.nottingham.ac.uk/49692/ Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings Sadeghimeresht, Esmaeil Reddy, Liam Hussain, Tanvir Markocsan, Nicolaie Joshi, Shrikant Chlorine-induced corrosion of HVAF-sprayed Ni21Cr and Ni5Al coatings was investigated in 5 vol.% O2 + 500vppm HCl + N2 with and without KCl at 600 °C up to 168 h. Both coatings were protective in the absence of KCl. With KCl, Ni21Cr degraded through a two-stage mechanism: 1) formation of K2CrO4 followed by diffusion of Cl− through the oxide grain boundaries to yield chlorine and a non-protective oxide, and 2) inward diffusion of chlorine though defects in the non-protective oxide, leading to breakaway oxidation. Cl−/Cl2 could not diffuse through the protective alumina scale formed on Ni5Al, hence the corrosion resistance increased. Elsevier 2018-03-31 Article PeerReviewed application/pdf en cc_by_nc_nd https://eprints.nottingham.ac.uk/49692/81/Chlorine%20induced%20HVAF-Final%20with%20Figs.pdf Sadeghimeresht, Esmaeil, Reddy, Liam, Hussain, Tanvir, Markocsan, Nicolaie and Joshi, Shrikant (2018) Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings. Corrosion Science, 132 . pp. 170-184. ISSN 1879-0496 Thermal spray coating; NiCr; NiAl; High-velocity air fuel (HVAF); Biomass-/waste-fired boiler; Fireside corrosion https://www.sciencedirect.com/science/article/pii/S0010938X1731096X?via%3Dihub doi:10.1016/j.corsci.2017.12.033 doi:10.1016/j.corsci.2017.12.033 |
| spellingShingle | Thermal spray coating; NiCr; NiAl; High-velocity air fuel (HVAF); Biomass-/waste-fired boiler; Fireside corrosion Sadeghimeresht, Esmaeil Reddy, Liam Hussain, Tanvir Markocsan, Nicolaie Joshi, Shrikant Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings |
| title | Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings |
| title_full | Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings |
| title_fullStr | Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings |
| title_full_unstemmed | Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings |
| title_short | Chlorine-induced high temperature corrosion of HVAF-sprayed Ni-based alumina and chromia forming coatings |
| title_sort | chlorine-induced high temperature corrosion of hvaf-sprayed ni-based alumina and chromia forming coatings |
| topic | Thermal spray coating; NiCr; NiAl; High-velocity air fuel (HVAF); Biomass-/waste-fired boiler; Fireside corrosion |
| url | https://eprints.nottingham.ac.uk/49692/ https://eprints.nottingham.ac.uk/49692/ https://eprints.nottingham.ac.uk/49692/ |