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Influence of Pulse Electrodeposition and Heat Treatment on Microstructure, Tribological, and Corrosion Behavior of Nano-Grain Size Co-W Coatings

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Abstract

In the present study, Co-W nano-structured alloy coatings are produced on low-carbon steel substrate by means of pulse electrodeposition from a citrate-based bath under different average current densities and duty cycles. The results indicate that the coating deposited under 60% of duty cycle and 1 A/dm2 of average current density exhibit optimum pulse plating conditions with 44.38 wt.% W, 37 nm grain size, and 758 HV microhardness. The effect of heat treatment temperature on microstructure, composition, corrosion behavior, and morphology of amorphous deposited Co-W alloy with 44 wt.% W was investigated. The microhardness of the coating increased to 1052 HV after heat treatment at 600 °C, which is due to the formation of Co3W and CoWO4 phases in the deposit. Furthermore, the coatings heat-treated at 600 °C had lower friction coefficients and better wear resistance under various loads than before heating.

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Narmak, Tehran, 1684613114, Iran

    Somayeh Abazari, Saeed Rastegari & Shahram Kheirandish

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  1. Somayeh Abazari
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  2. Saeed Rastegari
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Correspondence to Saeed Rastegari.

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Abazari, S., Rastegari, S. & Kheirandish, S. Influence of Pulse Electrodeposition and Heat Treatment on Microstructure, Tribological, and Corrosion Behavior of Nano-Grain Size Co-W Coatings. J. of Materi Eng and Perform 26, 3133–3143 (2017). https://doi.org/10.1007/s11665-017-2698-3

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  • DOI: https://doi.org/10.1007/s11665-017-2698-3

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