Corrosion Behavior of Ni-P Coated Steel Strips
Abstract
In addition to high hardness, Ni-P coatings obtained by the electroless method are widely used due to their high corrosion resistance. The corrosion resistance depends on the content of phosphorus in the coating. Various phosphorus contents result from changes in pH in the process of obtaining layers. The layers obtained in different working conditions were tested for electrochemical corrosion. Tests were conducted on a potentiostat PGP 201. There were plotted and analyzed the anodic polarization Tafel curves for different phosphorus contents, pH conditions and timeexposure in the coating bath. Analyzing the anodic polarization curves it is noticed that low phosphorus sample shows an almost continuous corrosion process while samples with high phosphorus content have slow corrosion in the 3.5% NaCl testing medium.
References
[2]. Glenn O. Mallory, Juan B. Hajdu, Electroless Plating – Fundamentals and Applications, American Society of Civil Engineers 1990.
[3]. Mordechay Schlesinger, Milan Paunovic, Electroless deposition of nickel in Modern Electroplating 5th Edition, ISBN 978-0-470-16778-6, 2010.
[4]. I. E. Ayoub, Study of electroless Ni-P plating on stainless steel, The Online Journal on Mathematics and Statistics (OJMS) vol. 1, no. 1, Reference Number: W10-0028 13, p. 13-16.
[5]. F. Reidenbach, ASM handbook, surface engineering, vol 5. ASM International, Materials Park, Pages p. 290-310, 1994.
[6]. A. C. Ciubotariu, L. Benea, M. Lakatos–Varsanyi, V. Dragan, Electrochemical impedance spectroscopy and corrosion behaviour of Al2O3 –Ni nano composite coatings, Electrochimica Acta, 53, p. 4557-4563, 2008.
[7]. Fernando B. Mainier, Maria P. Cindra Fonseca, Sérgio S. M. Tavares, Juan M. Pardal, Quality of Electroless Ni-P (NickelPhosphorus) Coatings Applied in Oil Production Equipment with Salinity, Journal of Materials Science and Chemical Engineering, 1, p. 1-8, 2013.
[8]. T. S. N. Sankara Narayanan, I. Baskaran, K. Krishnaveni, S. Parthiban, Deposition of electroless Ni–P graded coatings and evaluation of their corrosion resistance, Surface & Coatings Technology, 200, p. 3438-3445, 2006.
[9]. 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, p. 1917-1925, 2006.
