Title: Effect of duty cycle on microstructure, composition and ablation resistance of tungsten-cobalt coatings prepared by electrodeposition

Authors: Lu Haipeng; Qin Junqi; Di Changchun

Addresses: Department of Artillery Engineering, Army Engineering University, No. 97 Heping West Road, Shijiazhuang 050000, China ' Department of Artillery Engineering, Army Engineering University, No. 97 Heping West Road, Shijiazhuang 050000, China ' Department of Artillery Engineering, Army Engineering University, No. 97 Heping West Road, Shijiazhuang 050000, China

Abstract: In order to explore the ablation resistance of the tungsten-cobalt coating, tungsten-cobalt coatings with different tungsten contents were prepared on the surfaces of PCrNi3MoVA steels by electrodeposition under different duty cycles. The results show that the tungsten content in the coating increases first and then decreases with the increase of the duty cycle. When the duty cycle is 30%, the tungsten content is the highest (43.37wt%). The grain size increases with the increase of the duty cycle. The sample prepared at the duty cycle of 30% has the best ablation resistance, and its relative mass ablation rate and relative line ablation rate are 0.08% and 0.89%, respectively. The effect of duty cycle on ablation resistance of the tungsten-cobalt coating is mainly achieved by affecting the tungsten content and the grain size in the coating. Higher tungsten content and denser crystal, the ablation resistance of tungsten-cobalt coating is better.

Keywords: pulse electrodeposition; tungsten-cobalt coating; duty cycle; tungsten content; ablative properties.

DOI: 10.1504/IJMMP.2019.099909

International Journal of Microstructure and Materials Properties, 2019 Vol.14 No.3, pp.256 - 271

Received: 07 Jul 2018
Accepted: 04 Nov 2018

Published online: 21 May 2019 *

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