Effects of NaBH4 and Heat-Treat on Corrosion Resistance of Electroless Plating Ni-B Coating

Abstract:

Ni-B/Ni-B-B4C composite coatings on the substrate of medium-carbon steel (45#) were successfully fabricated by electroless plating in a low temperature bath. The corrosion resistance of Ni-B coating were examined by using electrochemical workstation. The results indicated that there are no pores and cracks and other defects at the interface between the substrate and composite coating. It was found that the corrosion resistance of Ni-B coating increased and then decreased with the addition of NaBH₄ increasing, and the best addition in plating bath was about 0.9 g/L. While the corrosion resistance of Ni-B coating heat-treated at 400°C with NaBH₄ addition 0.9 g/L was the worst.

• Periodical: Materials Science Forum (Volumes 809-810)
• Pages: 604-609
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.809-810.604
• Online since: December 2014
• Authors: Chu Xu Dong, Wan Chang Sun*, Jumei Zhang, Hui Cai, Li Bin Niu
• Keywords: B₄C Particles, Corrosion Resistance, Electroless Deposition, Ni-B Alloy

References

[1] T.P. PengXuan. Functional material surface coating and its application] [M]. Beijing: Mechanical Industry Press, 2008: 110~113.

[2] Mustafa Anik, Erhan Körpe, Esin Şen. Effect of coating bath composition on the properties of electroless nickel-boron films[J]. Surface & Coatings Technology, 2008, 202: 1718-1727.

DOI: 10.1016/j.surfcoat.2007.07.031

[3] K. Krishnaveni, T.S.N. Sankara Narayanana, S.K. Seshadri. Electroless Ni-B coatings: preparation and evaluation of hardness and wear resistance[J]. Surface & Coatings Technology, 2005, 190: 115-121.

DOI: 10.1016/j.surfcoat.2004.01.038

[4] K. Brunelli, M. Dabalà, F. Dughiero, et al. Diffusion treatment of Ni-B coatings by induction heating to harden the surface of Ti-6Al-4V alloy[J]. Materials Chemistry and Physics, 2009, 54: 127-136.

DOI: 10.1016/j.matchemphys.2009.01.016

[5] W.X. Zhang, Z.H. Jiang, G.Y. Li, et al. Electroless Ni-P/Ni-B duplex coatings for improving the hardness and the corrosion resistance of AZ91D magnesium alloy[J]. Applied Surface Science, 2008, 254: 4949-4955.

DOI: 10.1016/j.apsusc.2008.01.144

[6] I. Baskaran, R. Sakthi Kumar, T.S.N. Sankara Narayanan, et al. Formation of electroless Ni-B coatings using low temperature bath and evaluation of their characteristic properties[J]. Surface & Coatings Technology, 2006, 200: 6888-6894.

DOI: 10.1016/j.surfcoat.2005.10.013

[7] Qun-li Rao, Gang Bi, Qing-hua Lu, et al. Microstructure evolution of electroless Ni-B film during its depositing process[ J ]. Applied Surface Science, 2005, 240: 28-33.

DOI: 10.1016/j.apsusc.2004.07.059

[8] B. Oraon, G. Majumdar, B. Ghosh. Improving hardness of electroless Ni–B coatings using optimized deposition conditions and annealing[J]. Materials and Design, 2008, 29: 1412-1418.

DOI: 10.1016/j.matdes.2007.09.005