Wear and corrosion resistance of laser clad Ni2Si/NiSi composite coatings

Wear- and corrosion-resistant Ni2Si/NiSi composite coatings were fabricated on a substrate of 0.2% C carbon steel by laser-cladding using Ni-40 at.% Si elemental powder blends. Microstructure of the Ni2Si/NiSi composite coatings consists of plate-like Ni2Si primary phase and small amount of Ni2Si/Ni...

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Bibliographic Details
Published in:Surface & coatings technology 2003-05, Vol.168 (2-3), p.202-208
Main Authors: WANG, H. M, WANG, C. M, CAI, L. X
Format: Article
Language:English
Subjects:
Applied sciences
Coating
Exact sciences and technology
Joining, thermal cutting: metallurgical aspects
Metals. Metallurgy
Production techniques
Surface treatment
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Summary:Wear- and corrosion-resistant Ni2Si/NiSi composite coatings were fabricated on a substrate of 0.2% C carbon steel by laser-cladding using Ni-40 at.% Si elemental powder blends. Microstructure of the Ni2Si/NiSi composite coatings consists of plate-like Ni2Si primary phase and small amount of Ni2Si/NiSi eutectics in the inter-plate regions. Corrosion properties were evaluated using the anodic polarization and immersion corrosion methods in H2SO4 and NaCl water solutions. Wear resistance was tested under room-temperature block-on-wheel dry sliding wear test conditions. Because of the high hardness and abnormal temperature dependence and excellent corrosion-resisting properties inherent to the nickel silicides Ni2Si and NiSi, the laser clad/rapidly solidified Ni2Si/NiSi composite coatings have excellent chemical and electrochemical corrosion resistance and exhibit outstanding wear resistance and low friction coefficient under dry sliding wear test conditions.
ISSN:0257-8972
1879-3347
DOI:10.1016/s0257-8972(03)00240-8