Home HOME Kovove Materialy-Metallic Materials 2019 Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 3, pp.167–175

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Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 3, pp.167–175

Title: Influence of current type on tribological and corrosion properties of nickel boron coatings produced by electrodeposition
Author: U. Barut, R. Karslioglu
Abstract: In the present work, Ni-B alloys were successfully coated on the low carbon steel substrate
from a modified watt type bath with direct current, pulse current and pulse reverse
current. Effects of current type on microstructure and surface morphology were characterized
via scanning electron microscopy. Crystallographic orientation, lattice distortion and grain
size changing with different current type were investigated with X-ray diffraction. High lattice
distortion and lower grain size performed with pulse current and pulse reverse current type
respectively. Mechanical studies imply that pulse current type provides the highest microhardness
values. Tribological properties of alloys carried out reciprocating sliding wear tests.
Reciprocating sliding wear tests evidenced that the alloy coatings deposited by using pulse
current and pulse reverse current demonstrated substantial advancement in mechanical properties
and wear resistance because of the current type. Pulse current and pulse reverse current
provide higher wear resistance when compared with plating produced via direct current. According
to the corrosion test results, the highest corrosion resistance was obtained by direct
current, and the lowest corrosion resistance was obtained by pulse reverse current. The result
is that the grain size is the main factor for corrosion resistance.
Keywords: electrodeposition, current type, nickel boron, wear, corrosion
Published online: 21-May-2019
Year: 2019, Volume: 57, Issue: 3 Page From: 167, Page To: 175
doi:10.4149/km_2019_3_167


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