Obtaining of the Ni-P Coatings on Steel Strips

Abstract:

The Ni-P coatings on steel strips were obtained by electroless method. Experiments were performed at three pHs, respectively: 6.6; 5.11 and 4.32 with immersion times 5 and 12 minutes at 80 - 85°C. Deposits were caractherized by energy-dispersive analysis (EDS), scanning electron microscopy (SEM) and optical microscopy. The chemical composition shows an increased of phosphorus content at the pH descrease, so at the pH-6.6 the phosphorus content in the coating is 4.74 wt% and at pH-4.32 is 12.42 wt% P. Regardless of the pH value is observed was some chemical dishomogeneity of layers the more pronounced with as the pH value is higher. Alongside Ni and P the layers can contain small amounts of oxygen and other elements coming from the nickel bath impurities and from working environment. Also it shows the surface morphology in correlation with the deposition process parameters and surface defects possible.

• Periodical: Advanced Materials Research (Volume 1143)
• Pages: 20-25
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1143.20
• Online since: February 2017
• Authors: Tamara Radu
• Keywords: Chemical Homogenity, Defects, Electroless, Ni-P Layers, Surfaces Aspect

References

[1] B. F Mainier, M.P. Cindra Fonseca, S.S.M. Tavares, J.M. Pardal, Quality of Electroless Ni-P (Nickel-Phosphorus) Coatings Applied in Oil Production Equipment with Salinity, Journal of Materials Science and Chemical Engineering (2013) 1-8.

DOI: 10.4236/msce.2013.16001

[2] G.G. Istrate, S.I. Balint, A. Ciocan, V. Dragan, Influence of technological parameters on layer thickness to obtain Ni-P electroless coatings, SGEM 2015 Conference Proceedings, ISBN 978-619-7105-42-1/ISSN 1314-2704, Vol. 1 (2015) 113-125.

DOI: 10.5593/sgem2015/b61/s24.016

[3] S.I. Balint, S. Constantinescu, L. Balint, Influence of heat treatment on the characteristics of Ni-P-Al2O3 composite layers, SGEM 2015 Conference Proceedings, ISBN 978-619-7105-42-1/ISSN 1314-2704, Vol. 1(2015) 99-111.

DOI: 10.5593/sgem2015/b61/s24.014

[4] R. Taheri, Evaluation of Electroless Nickel-Phosphorus (EN) Coatings, Thesis, University of Saskatchewan, Saskatoon, (2003).

[5] G.G. Istrate, T. Radu, Corrosion Behavior of Ni-P Coated Steel Strips, The Annals of Dunarea de jos, University of Galati. Fascicle IX. Metallurgy and Mat. Sc. No. 3 (2015) 48-52.

DOI: 10.35219/mms.2020.1.06

[6] T. Radu, M. Vlad, F. Potecasu, G.G. Istrate, Preparation and characterisation of electroless Ni-P-Al2O3 nanocomposite coatings, Digest Journal of Nanomaterials and Biostructures, Vol. 10, No. 3 (2015) 1055 – 1065.

[7] K. Hari Krishnan, S. John, K.N. Srinivasan, J. Praveen, M. ganesan, P.M. Kavimani, An Overall Aspect of Electroless Ni-P Depositions—A Review Article, Metallurgical And Materials Transactions A, Vol. 37A, (2006) 1917-(1925).

DOI: 10.1007/s11661-006-0134-7

[8] M. Schwartz, Deposition from Aqueous Solutions, http: /www. tau. ac. il/~chemlaba/Files/1. pdf.

[9] L. Hyland, Electroless Deposition of Group Eight Metals, Thesis of Univ. of Hull, Oct. (1995).

[10] C. Gurău, G Gurău, P. alexandru, N. Ghiban, Ultrafine Microstructures Of Steel X60 Induced By Severe Plastic Deformation, Metallurgia International Special Issue vol. XIX no. 2 (2013) 37-42.

[11] T. Radu, S. Constantinescu, F. Potecasu - Cooling Oil Influence of the Surface Quality of the Rolled Strip The Annals of Dunarea de Jos, University of Galati. Fascicle IX. Metallurgy and Materials Science, nr. 4 (2014) 5-10.

DOI: 10.35219/mms.2018.4.02