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Abstract

Corrosion Behavior of Fe-Based Amorphous/Nanocrystalline Composite Coating: Correlating the Influence of Porosity and Amorphicity †

1
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
2
Research and Development Division, Tata Steel, Jamshedpur 831007, India
*
Author to whom correspondence should be addressed.
Presented at the First Corrosion and Materials Degradation Web Conference, 17–19 May 2021; Available online: https://cmdwc2021.sciforum.net/.
Mater. Proc. 2021, 6(1), 24; https://doi.org/10.3390/CMDWC2021-10042
Published: 8 May 2021
(This article belongs to the Proceedings of The 1st Corrosion and Materials Degradation Web Conference)

Abstract

:
Recently, Fe-based amorphous coatings synthesized by different thermal spraying methods have been investigated as a potential candidate for long-term surface protection of various structures due to their outstanding wear and corrosion resistance. Defects such as porosity and crystallization are inevitable in the thermal-sprayed coatings, which are introduced during the synthesis process. The corrosion behavior of these coatings is adversely affected by the presence of such defects. However, identification of a microstructural feature among amorphous content and porosity that has a greater influence on the corrosion resistance of thermal-sprayed Fe-based amorphous/nanocrystalline coating has remained elusive so far. Thus, to address this problem, in situ amorphous/nanocrystalline composite coatings were synthesized via high-velocity oxy-fuel (HVOF) spraying, along with two melt-spun ribbons of different amorphous content (one fully amorphous, FA-Rib and the other with a similar level of amorphicity to the coatings, PA-Rib). Results obtained from electrochemical characterizations, Raman analysis and Auger electron spectroscopy revealed reduced amorphicity as the primary factor that affects the corrosion behavior of such coatings. A mechanism has been proposed to explain the role of amorphicity and porosity in the corrosion behavior of Fe-based amorphous/nanocrystalline coatings. This study will ultimately help to design new amorphous composite coatings with improved corrosion resistance.

Supplementary Materials

The conference presentation file is available at www.mdpi.com/aiticle/10.3390/CMDWC2021-10042/s1.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Acknowledgments

The author, T. Laha thankfully acknowledges the financial support obtained from Research and Development Division of Tata Steel, India.

Conflicts of Interest

The authors declare no conflict of interest.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Share and Cite

MDPI and ACS Style

Nayak, S.K.; Kumar, A.; Sarkar, K.; Banerjee, A.; Laha, T. Corrosion Behavior of Fe-Based Amorphous/Nanocrystalline Composite Coating: Correlating the Influence of Porosity and Amorphicity. Mater. Proc. 2021, 6, 24. https://doi.org/10.3390/CMDWC2021-10042

AMA Style

Nayak SK, Kumar A, Sarkar K, Banerjee A, Laha T. Corrosion Behavior of Fe-Based Amorphous/Nanocrystalline Composite Coating: Correlating the Influence of Porosity and Amorphicity. Materials Proceedings. 2021; 6(1):24. https://doi.org/10.3390/CMDWC2021-10042

Chicago/Turabian Style

Nayak, Sapan K., Anil Kumar, Kuntal Sarkar, Atanu Banerjee, and Tapas Laha. 2021. "Corrosion Behavior of Fe-Based Amorphous/Nanocrystalline Composite Coating: Correlating the Influence of Porosity and Amorphicity" Materials Proceedings 6, no. 1: 24. https://doi.org/10.3390/CMDWC2021-10042

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