Comparison of hot corrosion behaviour of Fe-Cr and Fe-Al alloys beneath chloride salt melt

T. J. Pan; M. Sánchez-Pasten; Y. S. Li

doi:10.1515/HTMP.2009.28.3.147

Comparison of hot corrosion behaviour of Fe-Cr and Fe-Al alloys beneath chloride salt melt

T. J. Pan, M. Sánchez-Pasten, Y. S. Li

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

4 Scopus citations

Abstract

The hot corrosion of Fe-Al and Fe-Cr alloys beneath a ZnCI₂-KCI melt at 723 K was comparatively studied in an air atmosphere by exposure test. Different accelerated corrosion behaviours were observed on the alloys examined. A high Cr content in the alloy was not effective to prevent the substrate materials degradation, whereas the corrosion resistance of Fe-Al alloys was significantly improved with increasing Al concentration. Metallic Zn was formed as one of the reaction products on Fe-Al substrates, and its amount on the top surface increases with higher Al concentration in the alloy. Only Zn compounds (oxide or spinel) were detected on those Al-free Fe-Cr substrates. Accordingly, a fluxing mechanism was proposed for the substrate degradation of Fe-Cr alloys, and a displacement reaction mechanism might match with Fe-Al systems.

Original language	English
Pages (from-to)	147-153
Number of pages	7
Journal	High Temperature Materials and Processes
Volume	28
Issue number	3
DOIs	https://doi.org/10.1515/HTMP.2009.28.3.147
State	Published - 2009
Externally published	Yes

Keywords

Alloy
Chloride salt
Fe-Al
Fe-Cr
Hot corrosion

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10.1515/HTMP.2009.28.3.147

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abstract = "The hot corrosion of Fe-Al and Fe-Cr alloys beneath a ZnCI2-KCI melt at 723 K was comparatively studied in an air atmosphere by exposure test. Different accelerated corrosion behaviours were observed on the alloys examined. A high Cr content in the alloy was not effective to prevent the substrate materials degradation, whereas the corrosion resistance of Fe-Al alloys was significantly improved with increasing Al concentration. Metallic Zn was formed as one of the reaction products on Fe-Al substrates, and its amount on the top surface increases with higher Al concentration in the alloy. Only Zn compounds (oxide or spinel) were detected on those Al-free Fe-Cr substrates. Accordingly, a fluxing mechanism was proposed for the substrate degradation of Fe-Cr alloys, and a displacement reaction mechanism might match with Fe-Al systems.",

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AU - Pan, T. J.

AU - Sánchez-Pasten, M.

AU - Li, Y. S.

PY - 2009

Y1 - 2009

N2 - The hot corrosion of Fe-Al and Fe-Cr alloys beneath a ZnCI2-KCI melt at 723 K was comparatively studied in an air atmosphere by exposure test. Different accelerated corrosion behaviours were observed on the alloys examined. A high Cr content in the alloy was not effective to prevent the substrate materials degradation, whereas the corrosion resistance of Fe-Al alloys was significantly improved with increasing Al concentration. Metallic Zn was formed as one of the reaction products on Fe-Al substrates, and its amount on the top surface increases with higher Al concentration in the alloy. Only Zn compounds (oxide or spinel) were detected on those Al-free Fe-Cr substrates. Accordingly, a fluxing mechanism was proposed for the substrate degradation of Fe-Cr alloys, and a displacement reaction mechanism might match with Fe-Al systems.

AB - The hot corrosion of Fe-Al and Fe-Cr alloys beneath a ZnCI2-KCI melt at 723 K was comparatively studied in an air atmosphere by exposure test. Different accelerated corrosion behaviours were observed on the alloys examined. A high Cr content in the alloy was not effective to prevent the substrate materials degradation, whereas the corrosion resistance of Fe-Al alloys was significantly improved with increasing Al concentration. Metallic Zn was formed as one of the reaction products on Fe-Al substrates, and its amount on the top surface increases with higher Al concentration in the alloy. Only Zn compounds (oxide or spinel) were detected on those Al-free Fe-Cr substrates. Accordingly, a fluxing mechanism was proposed for the substrate degradation of Fe-Cr alloys, and a displacement reaction mechanism might match with Fe-Al systems.

KW - Alloy

KW - Chloride salt

KW - Fe-Al

KW - Fe-Cr

KW - Hot corrosion

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DO - 10.1515/HTMP.2009.28.3.147

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VL - 28

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EP - 153

JO - High Temperature Materials and Processes

JF - High Temperature Materials and Processes

IS - 3

ER -

Comparison of hot corrosion behaviour of Fe-Cr and Fe-Al alloys beneath chloride salt melt

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Keywords

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