Assessment of HVAF thermally sprayed coatings: Unraveling microstructural, electrochemical, and tribological performance using glass former Fe-Cr-Mo-Nb-B feedstock powder

被引：0

作者：

Mota I.G.C. ^{[1
,2
]}

Koga G.Y. ^{[2
,3
]}

Rodrigues L.C.M. ^{[1
,2
]}

Nascimento A.R.C. ^{[4
]}

Ettouil F.B. ^{[5
]}

Ferreira T. ^{[2
]}

Coimbrão D.D. ^{[1
,2
]}

Kiminami C.S. ^{[2
]}

Bolfarini C. ^{[2
]}

Moreau C. ^{[5
]}

Botta W.J. ^{[2
]}

机构：

[1] Federal University of São Carlos, Graduate Program in Materials Science and Engineering, Rod. Washington Luis, km 235, SP, São Carlos

[2] Federal University of São Carlos, Department of Materials Science and Engineering, Rod. Washington Luis, km 235, SP, São Carlos

[3] Center of Characterization and Development of Materials (CCDM), Federal University of Sao Carlos, Rodovia Washington Luiz, km 235 SP-310, São Paulo, São Carlos

[4] Thermal Spray and Multiphase Flow Laboratory, Concordia University, Montreal, H3G 1M8, QC

[5] Department of Mechanical, Industrial and Aerospace Engineering, Concordia University, 1455 de Maisonneuve Blvd. W, Montreal, H3G 1M8, QC

来源：

Journal of Alloys and Metallurgical Systems | 2024年 / 6卷

基金：

巴西圣保罗研究基金会;

关键词：

Coating; Corrosion; Metallic Glass; Steel; Wear;

D O I：

10.1016/j.jalmes.2024.100081

中图分类号：

学科分类号：

摘要：

In this paper the microstructural features of the glass former Fe68Cr8Mo4Nb4B16 coatings are unveiled and related to their electrochemical and tribological responses. The coating was mostly glassy with some embedded borides (M3B2, M2B-tetragonal; M being the metallic elements of the alloy) and ferrite. The tribological behavior of the HVAF coated sample, characterized by a thickness of about 200 µm, ∼6% porosity and a Vickers hardness of 357 HV0.5, was assessed in a sphere-on-plate configuration, revealing a specific wear rate of approximately 5 ×10−4 mm3∙N−1m−1. The wear mechanism was dominated by delamination caused by fragile intersplats. The corrosion resistance of HVAF coatings was evaluated in 0.6 M NaCl solution and compared with the results obtained for the crystalline Fe68Cr8Mo4Nb4B16 ingot, produced by melting in an induction furnace, and for the AISI 1020 steel substrate. The HVAF coating showed satisfactory corrosion resistance compared to the carbon steel substrate and the crystalline ingot, with the highest corrosion potential, Ecorr, values (−533 mVSCE) and the lowest corrosion current density, icorr, (10−6 A∙cm−2) followed by a clear passivation window upon anodic polarization in 0.6 M NaCl solution. Evaluations of HVAF coating showed a higher glassy content compared to the gas-atomized feedstock powders. This suggests that during spraying, certain particles were molten and experienced cooling rates adequate to inhibit crystallization, resulting in the freezing of the supercooled liquid. This phenomenon contributes to the good corrosion resistance observed in the present work and offers an opportunity to enhance the electrochemical behavior of HVAF coatings. © 2024 The Authors

引用

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