Effect of laser remelting on corrosion behavior of plasma-sprayed Ni-coated WC coatings

The corrosion properties of plasma-sprayed (PS) Ni-coated WC coatings are studied for both before and after laser remelting of the coatings. Optic microscope (OM), scanning electron microscope (SEM) and X-ray diffraction (XRD) are applied to investigate the microstructure and phase composition of PS...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 460; pp. 351 - 356
Main Authors Guozhi, Xie, Jingxian, Zhang, Yijun, Lu, Keyu, Wang, Xiangyin, Mo, Pinghua, Lin
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.07.2007
Elsevier
Subjects
Applied sciences
Corrosion
Corrosion prevention
Decarburization
Exact sciences and technology
Laser remelting
Metals. Metallurgy
Plasma spray
Production techniques
Surface treatment
Decarburization
WC
Plasma spray
Laser remelting
Defect density
Scanning electron microscopy
Phase composition
Remelting
Salt corrosion
Corrosion protection
Coatings
X ray diffraction
Spray coating
Surface treatment
Corrosion resistance
Surface melting
Lamellar structure
Nickel
Porosity
Microstructure
Plasma spraying
Laser fusion
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Summary:The corrosion properties of plasma-sprayed (PS) Ni-coated WC coatings are studied for both before and after laser remelting of the coatings. Optic microscope (OM), scanning electron microscope (SEM) and X-ray diffraction (XRD) are applied to investigate the microstructure and phase composition of PS Ni-coated WC coatings. The results indicate that coatings with laser remelting could improve their microstructure, such as lower porosity rate, weaker lamellar structure and more uniform distribution of phases. XRD shows that the W 2C phase is not identified both in as-sprayed and coatings with laser remelting, which means that the decarburization of WC has not happened because of Ni-coated WC grain. However, the Ni compounds were observed both in the plasma spray and the laser-remelting coatings. The salt spray corrosion (SSC) shows that the laser remelting coating has better corrosion resistance, which is mainly due to its fully dense top layer, low number of defects and uniform distribution of the phase and composition.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2007.01.064