Electroless ternary Ni-Co-P and quaternary Ni-W-Co-P coatings: Preparation and characterization

Ezhil Selvi, V and Balaraju, JN and Ramesh, K (2015) Electroless ternary Ni-Co-P and quaternary Ni-W-Co-P coatings: Preparation and characterization. In: Int. Conf. on Advances in Materials, Manfacturing and Applications (AMMA-2015), 04-09-2015, NIT Tiruchirappalli.

PDF cp317.pdf Download (65kB)

Abstract

Autocatalytic/electroless quaternary NiCoWP coatings were prepared by using an alkaline based bath. Ternary NiCoP coatings were also prepared for the comparison. Coatings were characterized for their morphology, composition, phase transformation behavior, microhardness and corrosion resistance. Surface of the both deposits exhibited nodular structure but W incorporation in NiCoP matrix had resulted in a marginal increase in nodularity. Roughness (Ra) values measured using Optical profilometer indicated that quaternary deposits exhibited more roughness (0.08 μm) compared to ternary deposits. Compositional analysis carried out on ternary deposit showed the presence of Ni (37 wt.%), Co (53 wt.%) along with about 10 wt.% of P. Whereas W ( ≈ 3 wt.%) incorporation in NiCoP matrix had resulted in decrease in Co (48 wt.%) and P (7 wt.%) contents. Microhardness measurements made on as-plated both coatings exhibited almost similar hardness (about 430±20 VHN25gf)

Item Type:	Conference or Workshop Item (Paper)
Subjects:	ENGINEERING > Structural Mechanics
Depositing User:	Mrs Manoranjitha M D
Date Deposited:	02 May 2016 07:54
Last Modified:	02 May 2016 07:54
URI:	http://nal-ir.nal.res.in/id/eprint/12466

Actions (login required)

View Item