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Coatings 2017, 7(11), 200; https://doi.org/10.3390/coatings7110200

Effect of Initial Surface Roughness on Cavitation Erosion Resistance of Arc-Sprayed Fe-Based Amorphous/Nanocrystalline Coatings

1
College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
2
College of Mechanics and Materials, Hohai University, Nanjing 211100, China
3
Jiangsu Jinxiang Transmission Equipment Co., Ltd., Huaian 223001, China
4
Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Shiladitya Paul
Received: 23 September 2017 / Revised: 18 October 2017 / Accepted: 1 November 2017 / Published: 14 November 2017
(This article belongs to the Special Issue Coatings for Harsh Environments)
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Abstract

The arc spraying process was used to prepare Fe-based amorphous/nanocrystalline coating. The cavitation erosion behaviors of FeNiCrBSiNbW coatings with different surface roughness levels were investigated in distilled water. The results showed that FeNiCrBSiNbW coating adhered well to the substrate, and was compact with porosity of less than 2%. With increasing initial surface roughness, the coatings showed an increase in mass loss of cavitation erosion damage. The amount of pre-existing defects on the initial surface of the coatings was found to be a significant factor for the difference in the cavitation erosion behavior. The cavitation erosion damage for the coatings was a brittle erosion mode. The evolution of the cavitation erosion mechanism of the coatings with the increase of the initial surface roughness was micro-cracks, pits, detachment of fragments, craters, cracks, pullout of the un-melted particle, and massive exfoliations. View Full-Text
Keywords: cavitation; roughness; coatings; amorphous/nanocrystalline; Fe-based cavitation; roughness; coatings; amorphous/nanocrystalline; Fe-based
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Lin, J.; Wang, Z.; Cheng, J.; Kang, M.; Fu, X.; Hong, S. Effect of Initial Surface Roughness on Cavitation Erosion Resistance of Arc-Sprayed Fe-Based Amorphous/Nanocrystalline Coatings. Coatings 2017, 7, 200.

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