Residual Stresses on Electro-Deposited NiCo-Al and NiCo-Zr Composite Coatings

Residual Stresses on Electro-Deposited NiCo-Al and NiCo-Zr Composite Coatings

F. Cai, C. Jiang, B. Pan

Abstract: This experiment examined the residual stresses on electrodeposited NiCo-Al and NiCo-Zr composite coatings as well as the impact of varying Co2+concentrations on other properties of the coating, namely grain size and texture. To prepare for the experiments, this project employed modified Watt Baths containing NiSO4·6H2O (240 g/L), NiCl2·6H2O (40 g/L), H3BO3 (30 g/L) and C12H25NaSO4 (0.2 g/L) in order to electrically deposit them on to Aluminum and Zirconium and to produce the two types of aforementioned specimen: NiCo-Al and NiCO-Zr. The amount of Co in the end product is regulated via adjusting the concentration of CoSO4·7H2O, providing a range of concentrations from 5 to 40 g/L. Furthermore, structural analyses of the coatings were performed via X-ray diffraction at 40kV and 30mA in standard 2θ–θ mode. The Voigt method was used to calculate grain size and micro-strain of coatings using the integral breadth of the (200) peak. Residual stresses on the as-deposited composite coatings were measured by using stress analyzer and classical sin2ψ method. Peaks of (331)α of Ni were selected to calculate the residual stresses. Results show that, for both NiCo-Al and NiCo-Zr composite coatings, grain size decreases and micro-strain increases with increasing Co contents. Pole figure experiments shown typical fiber texture for composite coatings. Texture coefficient results show that the (111) texture coefficient increases while (111) texture coefficient decreases with increasing Co content. In addition, results show that the residual stress of NiCo-Al and NiCo-Zr composite coatings increases as Co content increases, which could be attributed to decreasing grain size and texture evolution from (200) texture to (111) texture.

Keywords
Composite Coating, Electro-Deposition, Texture, Residual Stress

Published online 12/22/2016, 6 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: F. Cai, C. Jiang, B. Pan, ‘Residual Stresses on Electro-Deposited NiCo-Al and NiCo-Zr Composite Coatings’, Materials Research Proceedings, Vol. 2, pp 539-544, 2017

DOI: https://dx.doi.org/10.21741/9781945291173-91

The article was published as article 91 of the book Residual Stresses 2016

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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