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Electrodeposited Ni-B coatings: Formation and evaluation of hardness and wear resistance
Suresh Krishnamoorthy Seshadri
Published in
2006
Volume: 99
   
Issue: 2-3
Pages: 300 - 308
Abstract
The formation of electrodeposited Ni-B alloy coatings using a dimethylamine borane (DMAB) modified Watt's nickel bath and evaluation of their structural characteristics, hardness and wear resistance are discussed. The boron content in the electrodeposited Ni-B alloy coating is determined by the ratio of rate of reduction of nickel and rate of decomposition of DMAB. The boron content of the electrodeposited Ni-B coating decreases as the current density increased from 0.4 to 4 A dm-2. XRD diffraction pattern of electrodeposited Ni-B coatings in their as-plated condition exhibits the presence of Ni (1 1 1), (2 0 0) and (2 2 0) reflections with (1 1 1) texture. Heat treatment at 400 °C for 1 h has resulted in the formation of nickel boride phases, which results in an increase in hardness and wear resistance. The mechanism of wear in electrodeposited Ni-B coatings is intensive plastic deformation of the coating due to the ploughing action of the hard counter disk. © 2005 Elsevier B.V. All rights reserved.
About the journal
JournalMaterials Chemistry and Physics
ISSN02540584
Open AccessNo
Concepts (15)
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    Decomposition
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    Electrodeposition
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    Hardness
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    Heat treatment
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    Plastic deformation
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    Protective coatings
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    Structure (composition)
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    Textures
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    Wear resistance
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    X ray diffraction
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    COUNTER DISK
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    DIMETHYLAMINE BORANE (DMAB)
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    NI-B COATING
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    Nickel boride
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    Nickel alloys