Wear properties of Ni–Mo coatings produced by pulse electroforming

Ni–Mo coatings with good mechanical properties were obtained by pulse plating. This study is focused on the current efficiency, molybdenum content and microhardness of the Ni–Mo coatings, which were affected by the pulse electroforming parameters. In addition, the wear resistance of the coatings was...

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Bibliographic Details
Published in:Surface & coatings technology 2014-11, Vol.258, p.639-645
Main Authors: Huang, Pao-Chang, Hou, Kung-Hsu, Sheu, Hung-Hua, Ger, Ming-Der, Wang, Gao-Liang
Format: Article
Language:English
Subjects:
Applied sciences
Coatings
Contact of materials. Friction. Wear
Cross-disciplinary physics: materials science
rheology
Current efficiency
Electroforming
Exact sciences and technology
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Molybdenum
Nickel
Nickel base alloys
Ni–Mo alloy
Physics
Production techniques
Protective coatings
Pulse electroforming
Pulse plating
Surface treatment
Surface treatments
Wear resistance
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Summary:Ni–Mo coatings with good mechanical properties were obtained by pulse plating. This study is focused on the current efficiency, molybdenum content and microhardness of the Ni–Mo coatings, which were affected by the pulse electroforming parameters. In addition, the wear resistance of the coatings was examined. The experimental results indicate that the Mo content in the PC-plated coatings increases upon increasing the frequency in the range 10–1000Hz. The maximum Mo content (30.2wt.%) in the coating occurred at a current density of 10A/dm2, a duty cycle of 0.7, and a frequency of 1000Hz. The XRD results indicate that the NiMo coatings prepared by pulse current are nanocrystalline and amorphous. The wear test results indicate that the wear resistance of the Ni–Mo coatings produced by pulse electroforming was higher than that produced by direct current plating. •The Ni–Mo coatings were prepared by direct & pulse current (DC & PC) techniques.•Increase Mo wt.% in coatings would enhance its mechanical properties.•Ni–Mo coating contains a nanocrystalline and amorphous phase from X-ray and TEM examined.•PC Ni–Mo coating with maximum Mo content (30.2wt.%) and it's hardness up to 850HV•The wear resistance of the PC Ni–Mo coatings was better than the DC Ni–Mo coatings.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2014.08.024