Mechanical and corrosion properties of plasma-sprayed Fe-based amorphous/nanocrystalline composite coating

• Published in: Advances in materials and processing technologies (Abingdon, England) Vol. 5; no. 2; pp. 371 - 377
• Main Authors: Kumar, Anil, Nayak, Sapan Kumar, Bijalwan, Pavan, Dutta, Monojit, Banerjee, Atanu, Laha, Tapas
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 03.04.2019
• Subjects: atmospheric plasma spraying; corrosion resistance; Fe-based amorphous/nanocrystalline composite coating; nanohardness; nanoscratch
• DOI: 10.1080/2374068X.2019.1598129
• ISSN: 2374-068X

In this study, Fe-based amorphous/nanocrystalline composite coatings were synthesized with a cost-effective lean composition of Fe−2.5Cr−6.7Si−2.5B−0.7C (wt%) onto mild steel substrates. The effects of plasma power on the morphology and amorphous phase content of the coatings were systematically investigated. Coatings exhibited relatively less porosity (~4 to 7 vol.%) and high amount of retained amorphous phase (87.2-91.3%) with nanocrystalline phases uniformly embedded in the amorphous matrix. At higher plasma power (23.7-35.5 kW) well-adhered splats formed which led to increase in hardness. Corrosion resistance of the coatings was examined via standard potentiodynamic polarization test, and the results showed that the coatings exhibited better corrosion resistance than mild steel and galvanized steel. The results show that Fe-based amorphous/nanocrystalline composite coatings have great potential for the industrial applications in the areas that involve high wear and corrosion.