Corrosion Rate of Electrodeposited Ni-Fe Alloys in Aerated Deionized Water and HCl Solutions
Abstract
The study of corrosion rate for Ni-Fe alloys will lead to fundamental data which is useful for manufacturing process of reader-writer in hard disk drive such as metal thickness loss and passivation behavior. The electrochemical technique such as potentiodynamic polarization was applied for corrosion rate study. However the corrosion study of Ni-Fe alloy which embedded in the reader-writer is not feasible due to the nanoscale size of the alloy. This work aims to produce electrodeposited Ni-Fe alloys at different mass fraction. The corrosion rate study was then performed in aerated deionized water and in aerated deionized water with the pH of 2 and 5 by addition of hydrochloric acid. The aeration allowed oxygen to dissolve into solution and oxygen can participate in the corrosion reaction. In the literature, the corrosion measurement is most of the time performed using inert gas to exclude oxygen out of the reaction. The measurement with the presence of oxygen in this work is similar to the actual corrosion of reader-writer in manufacturing process under atmosphere with normal oxygen level. It was found that the corrosion rate of Ni-Fe alloy has been increased with increasing Fe content. Keywords : corrosion, hard disk drive, Ni-Fe alloys, potentiodynamic polarizationReferences
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Tabakovic, I., Inturi, V., Thurn, J., & Kief, M. (2010). Properties of Ni1−xFex (0.1<x<0.9) and Invar (x=0.64) alloys obtained by electrodeposition. Electrochimica Acta, 55, 6749-6754.
Tetsukawa, H., Hommura, H., Okabe, A., & Soda, Y. (2007). Improved corrosion resistance of spin-valve film. Journal of Magnetism and Magnetic Materials, 313, 300-305.
van den Meerakker, J., & Baarslag, P. (2000). The behaviour of permalloy in NH4F/HF solutions. Corrosion Science, 42, 1169-1183.
Wood, R. (2009). Future hard disk drive systems. Journal of Magnetism and Magnetic Materials, 321, 555-561.
Bai, A., & Hu, C. (2005). Composition controlling of Co–Ni and Fe–Co alloys using pulse-reverse electroplating through means of experimental strategies. Electrochimica Acta, 50, 1335–1345.
Cooper, E.I., Bonhôte, C., Heidmann, J., Hsu, Y., Kern, P., Lam, J.W., Ramasubramanian, M., Robertson, N., Romankiw, L.T., & Xu, H. (2005). Recent developments in high-moment electroplated materials for recording heads. IBM Journal of Research and Development, 49, 103-126.
Coutu, L., Chaput, L., & Waeckerle, T. (2000). 50.50 FeNi permalloy with Ti and Cr additions for improved hardness and corrosion resistance. Journal of Magnetism and Magnetic Materials, 215-216, 237-239.
Frankel, G., Brusic, V., Schad, R., & Chang, J. (1993). Pitting corrosion of electroplated permalloy films. Corrosion Science, 35, 63-71.
Pourbaix, M. (1974). Atlas of electrochemical equilibria in aqueous solutions. Houston: NACE.
Revie, R.W. (2011). Uhlig's corrosion handbook. (3rd ed). New Jersey: Wiley.
Sriraman, K., Raman, S., & Seshadri, S. (2007). Corrosion behaviour of electrodeposited nanocrystalline Ni–W and Ni–Fe–W alloys. Materials Science and Engineering A, 460-461, 39-45.
Tabakovic, I., Inturi, V., Thurn, J., & Kief, M. (2010). Properties of Ni1−xFex (0.1<x<0.9) and Invar (x=0.64) alloys obtained by electrodeposition. Electrochimica Acta, 55, 6749-6754.
Tetsukawa, H., Hommura, H., Okabe, A., & Soda, Y. (2007). Improved corrosion resistance of spin-valve film. Journal of Magnetism and Magnetic Materials, 313, 300-305.
van den Meerakker, J., & Baarslag, P. (2000). The behaviour of permalloy in NH4F/HF solutions. Corrosion Science, 42, 1169-1183.
Wood, R. (2009). Future hard disk drive systems. Journal of Magnetism and Magnetic Materials, 321, 555-561.
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2016-07-07
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