Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications

This paper describes thermal spray techniques for making hard coatings on bushing and sleeve component surfaces. Specifically, plasma-arc welding was used to produce 5-mm thick Co-Cr alloy welding overlays on the bushing, while a high-velocity oxy-fuel spraying technique and laser re-melting techniq...

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Main Authors: Guangwei Zhang, Deyuan Li, Ning Zhang, Nannan Zhang, Sihua Duan
Format: Article
Language:English
Published: MDPI AG 2017-08-01
Series:Coatings
Subjects:
Online Access:https://www.mdpi.com/2079-6412/7/8/113
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spelling doaj-bef8ff2f57db45bf8eb31f3666451e622020-11-24T21:34:42ZengMDPI AGCoatings2079-64122017-08-017811310.3390/coatings7080113coatings7080113Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line ApplicationsGuangwei Zhang0Deyuan Li1Ning Zhang2Nannan Zhang3Sihua Duan4Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, ChinaMaterials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, ChinaMaterials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, ChinaMaterials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, ChinaDalian Huarui Heavy Industrial Special Spare Parts Co., Ltd., Dalian 116052, Liaoning, ChinaThis paper describes thermal spray techniques for making hard coatings on bushing and sleeve component surfaces. Specifically, plasma-arc welding was used to produce 5-mm thick Co-Cr alloy welding overlays on the bushing, while a high-velocity oxy-fuel spraying technique and laser re-melting technique were used to produce thinner coatings of Co-Cr-Ni+WC of about 1mm thickness on the sleeve-pipe counterparts. The surface-treated components were then submerged in liquid zinc to study the corrosive behaviour of the surface coating and substrate. Both the scanning electron microscope and energy dispersive spectrometer analyses were used to study the microstructure and phase composition of both coatings and substrates prior to and after corrosion experiments. The results show that the microstructure of the bushing consists of γ-cobalt solid solution as well as the eutectic structure of γ-cobalt and carbides, which have good corrosive resistance against molten zinc. Meanwhile, the microstructure of the sleeve pipe consists of a Co-Cr solid solution with various forms of carbides, which displays the combined properties of toughness with good corrosive resistance to molten zinc.https://www.mdpi.com/2079-6412/7/8/113sink rollerbushingsleeve pipethermal sprayhigh-velocity oxy-fuel (HVOF) spraywelding overlay
collection DOAJ
language English
format Article
sources DOAJ
author Guangwei Zhang
Deyuan Li
Ning Zhang
Nannan Zhang
Sihua Duan
spellingShingle Guangwei Zhang
Deyuan Li
Ning Zhang
Nannan Zhang
Sihua Duan
Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications
Coatings
sink roller
bushing
sleeve pipe
thermal spray
high-velocity oxy-fuel (HVOF) spray
welding overlay
author_facet Guangwei Zhang
Deyuan Li
Ning Zhang
Nannan Zhang
Sihua Duan
author_sort Guangwei Zhang
title Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications
title_short Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications
title_full Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications
title_fullStr Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications
title_full_unstemmed Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications
title_sort thermal-sprayed coatings on bushing and sleeve-pipe surfaces in continuous galvanizing sinking roller production line applications
publisher MDPI AG
series Coatings
issn 2079-6412
publishDate 2017-08-01
description This paper describes thermal spray techniques for making hard coatings on bushing and sleeve component surfaces. Specifically, plasma-arc welding was used to produce 5-mm thick Co-Cr alloy welding overlays on the bushing, while a high-velocity oxy-fuel spraying technique and laser re-melting technique were used to produce thinner coatings of Co-Cr-Ni+WC of about 1mm thickness on the sleeve-pipe counterparts. The surface-treated components were then submerged in liquid zinc to study the corrosive behaviour of the surface coating and substrate. Both the scanning electron microscope and energy dispersive spectrometer analyses were used to study the microstructure and phase composition of both coatings and substrates prior to and after corrosion experiments. The results show that the microstructure of the bushing consists of γ-cobalt solid solution as well as the eutectic structure of γ-cobalt and carbides, which have good corrosive resistance against molten zinc. Meanwhile, the microstructure of the sleeve pipe consists of a Co-Cr solid solution with various forms of carbides, which displays the combined properties of toughness with good corrosive resistance to molten zinc.
topic sink roller
bushing
sleeve pipe
thermal spray
high-velocity oxy-fuel (HVOF) spray
welding overlay
url https://www.mdpi.com/2079-6412/7/8/113
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