Microstructure and properties of electro-spark deposited Invar/amorphous composite coatings

doi:10.13251/j.issn.0254-6051.2022.11.041

Abstract

Abstract: Invar, Invar/amorphous and Invar/amorphous/Invar coatings were deposited on the 45Mn2 steel surface by electro-spark deposition technique using invar alloy electrode and pre-put Fe-based amorphous powders. The phase composition, microstructure, tribology behavior and electrochemical corrosion behavior in 3.5%NaCl solution of the deposited coatings were analyzed. The results show that the prepared coatings are continuous and uniform with a metallurgical bonding to the substrate. A 60 μm crack-free Invar/amorphous/Invar coating is obtained by an Invar bond layer produced on the substrate firstly. The Invar deposited coating is mainly consisted of FCC Fe-Ni solid solution, the Invar/amorphous and Invar/amorphous/Invar coatings are amorphous/solid composite structure. The average microhardness and friction coefficient of the Invar, Invar/amorphous and Invar/amorphous/Invar coatings are 176.6, 757.7, 772.8 HV0.1 and 0.44, 0.21, 0.19, respectively. Increasing the amorphous content of the deposited coating can improve the hardness, reduce the friction coefficient and improve the wear resistance. No obvious passivation phenomenon of the deposition coatings in 3.5% NaCl solution can be observed. The self-corrosion potential, self-corrosion current density of the substrate, Invar, Invar/amorphous and Invar/amorphous/Invar coatings are -0.74, -0.54, -0.34, -0.31 V and 7.08, 5.15, 3.78, 3.11 μA·cm^-2, respectively. The Invar/amorphous/Invar coating prepared by electro-spark deposition technology can effectively improve the wear resistance and corrosion resistance of the 45Mn2 steel substrate.

Key words: electro-spark deposition (ESD), Invar alloy, amorphous alloy coating, microstructure, properties

CLC Number:

TG139.8

He Yanling, Wang Yanfang, Si Jiajia, Shi Zhiqiang. Microstructure and properties of electro-spark deposited Invar/amorphous composite coatings[J]. Heat Treatment of Metals, 2022, 47(11): 238-244.

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