Effect of Cerium Concentration on the Corrosion Resistance of Electro-Less Ni-P-PTFE Composite Coatings

Abstract:

In order to improve the corrosion resistance of electro-less Ni-P-PTFE composite coating, electro-less Ni-P-PTFE composite coatings were prepared on 45# carbon steels specimen with addition of rare element cerium (Ce). Surface morphology of the coatings was observed by scanning electron microscope (SEM). Effect of cerium concentration on PTFE content of the coatings was investigated. The results indicated that properly added cerium into the bath increases the PTFE content of the coatings, decrease the corrosion rate, made the corrosion resistance improved of the coatings. And effect of cerium concentration on corrosion resistance of the composite coatings was evaluated by immersion test with 3.5% NaCl and 5% NaOH solutions respectively. With the rare element cerium concentration exceeding, the corrosion rate gradually increase. At the cerium concentration was 0.01 g.L^-1, the corrosion rate of coating in the solutions were lowest, at 0.00186 mg·cm^-2·h^-1 and 0.00109 mg·cm^-2· h^-1. But with the cerium concentration go on increasing, the corrosion resistance of the coatings then decreases.

• Periodical: Applied Mechanics and Materials (Volume 618)
• Pages: 247-251
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.618.247
• Online since: August 2014
• Authors: Chuan Qi Fu*, Fan Yong, Qing Le Zhang
• Keywords: Cerium Concentration, Corrosion Resistance, PTFE, Rare Element Cerium, Solution

References

[1] Gu C, Lian J, Li G, et al. High corrosion-resistant Ni-P/Ni/Ni-P multilayer coatings on steel [J]. Surface & Coatings Technology, 2005, 197(1): 61-67.

DOI: 10.1016/j.surfcoat.2004.11.004

[2] Y. S Huang, F.Z. Cui. Effect of complexing agent on the morphology and microstructure of electro-less deposited Ni-P alloy, Surface & Coatings Technology Vol. 201(2007), p.5416.

DOI: 10.1016/j.surfcoat.2006.07.189

[3] Peeters P, Hoorn G, Daenen T. Properties of electro-less and electroplated Ni-P and its application in microgalvanics [J]. Electrochim, Acta, 2001, 47(9): 161-169.

DOI: 10.1016/s0013-4686(01)00546-1

[4] R. Elansezhian, B. Ramamoorthy, P. Kesavan Nair, Effect of surfactants on the mechanical properties of electro-less (Ni-P) coating. Surface & Coatings Technology Vol. 203 (2008), p.709.

DOI: 10.1016/j.surfcoat.2008.08.021

[5] Caturla F, Molina F, Molina Sabio M, et al. Electro-less plating of graphite with copper and nickel[ J] . Journal of the Electro chemical Society, 1995, 142 (12): 4084-4090.

DOI: 10.1149/1.2048468

[6] Ming-Der Ger, Kung-Hsu Hou, Bing-Joe Hwang. Transient phenomena of the co-deposition of PTFE with electro-less Ni-P coating at the early stage[J]. Materials Chemistry and Physics, 2004, 87: 102-108.

DOI: 10.1016/j.matchemphys.2004.05.004

[7] Burchardt T. The effect of deposition temperature on the catalytic activity of Ni-P alloys toward the hydrogen reaction [J]. Int J Hydrogen Energy, 2002, 27: 323 － 326.

DOI: 10.1016/s0360-3199(01)00111-2

[8] Sharma A. K., Suresh M R, Bho jraj H, et al. Electro less nickel plating on magnesium alloy [J]. Metal Finishing, 1998, 96(3): 10~ 18.

DOI: 10.1016/s0026-0576(97)83005-x

[9] S. Alirezaei, S. M. Monirvaghefi, M. Salehi, A. Saatchi. Wear behavior of Ni-P and Ni-P-Al2O3 electro-less coatings. Wear. Vol. 262(2007), p.978.

DOI: 10.1016/j.wear.2006.10.013

[10] Zhao-Zhu Zhang, Qun-Ji Xue, Wei-Min Liu, Wei-Chang Shen, Friction and wear properties of metal powder filled PTFE composites under oil lubricated conditions. Wear. Vol. 210(1997), p.151.

DOI: 10.1016/s0043-1648(97)00052-5