Formation of Nanoscale Al2O3 Protective Layer by Preheating Treatment for Improving Corrosion Resistance of Dilute Fe-Al Alloys

Chenglong Li; Katharina Freiberg; Yuntong Tang; Stephanie Lippmann; Yongfu Zhu

doi:10.3390/ma15227978

Formation of Nanoscale Al₂O₃ Protective Layer by Preheating Treatment for Improving Corrosion Resistance of Dilute Fe-Al Alloys

Materials (Basel). 2022 Nov 11;15(22):7978. doi: 10.3390/ma15227978.

Authors

Chenglong Li¹, Katharina Freiberg², Yuntong Tang¹, Stephanie Lippmann², Yongfu Zhu¹

Affiliations

¹ Key Laboratory of Automobile Materials, Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
² Otto Schott Institute of Materials Research, Friedrich Schiller University, 07743 Jena, Germany.

Abstract

In this work, an attempt was made to improve the corrosion resistance of dilute Fe-Al alloys (1.0 mass% Al) by preheating treatment at 1073 K in H₂ atmosphere. In comparison with pure Fe and unpreheated Fe-Al alloys, the resistance to oxidation at 673 K in pure O₂ and to electrochemical corrosion in 5 wt.% NaCl solution is significantly improved for preheated Fe-Al alloys. This improvement is attributed to the formation of a 20 nm thin, but dense Al₂O₃ protective layer on the surface of preheated Fe-Al alloys.

Keywords: Fe-Al alloy; corrosion resistance; ferroalloy; heat treatment; oxidation.

Abstract

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