Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Mingwen Bai; Liam  Reddy; Tanvir  Hussain

doi:10.1016/j.corsci.2018.02.047

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Mingwen Bai, Liam Reddy , Tanvir Hussain

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Abstract

Alumina-forming β-NiAl coatings were deposited by high velocity oxy-fuel (HVOF) thermal spraying onto 304 stainless steels for protection against chlorine induced corrosion in a biomass-fired boiler. The corrosion test was conducted in a synthetic gas containing 500 ppm HCl with 10 wt% KCl ash deposit at 700 °C for 250 h. Severe corrosion was observed with the fast growing alumina at the coating/substrate interface initiating from sample edges. Possible corrosion mechanism was proposed: as supplied by HCl/KCl, the formation of volatile chlorine/chloride acted as a catalyst and promoted the growth of alumina at relatively lower application temperatures (<900 °C).

Original language	English
Pages (from-to)	147-157
Number of pages	11
Journal	Corrosion Science
Volume	135
Early online date	21 Feb 2018
DOIs	https://doi.org/10.1016/j.corsci.2018.02.047
Publication status	Published - 1 May 2018
Externally published	Yes

Bibliographical note

Keywords

Nickel aluminide
Stainless steel
HVOF
Biomass
Chlorine
Thermodynamic

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10.1016/j.corsci.2018.02.047Licence: CC BY

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http://dx.doi.org/10.1016/j.corsci.2018.02.047

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Mingwen Bai
- Institute for Future Transport and Cities - Assistant Professor in Materials, Mechanics and Measurement
Person: Teaching and Research

Cite this

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title = "Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C",

abstract = "Alumina-forming β-NiAl coatings were deposited by high velocity oxy-fuel (HVOF) thermal spraying onto 304 stainless steels for protection against chlorine induced corrosion in a biomass-fired boiler. The corrosion test was conducted in a synthetic gas containing 500 ppm HCl with 10 wt% KCl ash deposit at 700 °C for 250 h. Severe corrosion was observed with the fast growing alumina at the coating/substrate interface initiating from sample edges. Possible corrosion mechanism was proposed: as supplied by HCl/KCl, the formation of volatile chlorine/chloride acted as a catalyst and promoted the growth of alumina at relatively lower application temperatures (<900 °C).",

keywords = "Nickel aluminide, Stainless steel, HVOF, Biomass, Chlorine, Thermodynamic",

author = "Mingwen Bai and Liam Reddy and Tanvir Hussain",

note = " {\textcopyright} 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).",

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AU - Bai, Mingwen

AU - Reddy , Liam

AU - Hussain, Tanvir

PY - 2018/5/1

Y1 - 2018/5/1

N2 - Alumina-forming β-NiAl coatings were deposited by high velocity oxy-fuel (HVOF) thermal spraying onto 304 stainless steels for protection against chlorine induced corrosion in a biomass-fired boiler. The corrosion test was conducted in a synthetic gas containing 500 ppm HCl with 10 wt% KCl ash deposit at 700 °C for 250 h. Severe corrosion was observed with the fast growing alumina at the coating/substrate interface initiating from sample edges. Possible corrosion mechanism was proposed: as supplied by HCl/KCl, the formation of volatile chlorine/chloride acted as a catalyst and promoted the growth of alumina at relatively lower application temperatures (<900 °C).

AB - Alumina-forming β-NiAl coatings were deposited by high velocity oxy-fuel (HVOF) thermal spraying onto 304 stainless steels for protection against chlorine induced corrosion in a biomass-fired boiler. The corrosion test was conducted in a synthetic gas containing 500 ppm HCl with 10 wt% KCl ash deposit at 700 °C for 250 h. Severe corrosion was observed with the fast growing alumina at the coating/substrate interface initiating from sample edges. Possible corrosion mechanism was proposed: as supplied by HCl/KCl, the formation of volatile chlorine/chloride acted as a catalyst and promoted the growth of alumina at relatively lower application temperatures (<900 °C).

KW - Nickel aluminide

KW - Stainless steel

KW - HVOF

KW - Biomass

KW - Chlorine

KW - Thermodynamic

UR - http://dx.doi.org/10.1016/j.corsci.2018.02.047

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DO - 10.1016/j.corsci.2018.02.047

M3 - Article

VL - 135

SP - 147

EP - 157

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

ER -

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Abstract

Bibliographical note

Keywords

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Mingwen Bai

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Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C