Authors: Verdian, M. M.¹; Salehi, M.²; Raeissi, K.²

Source: Surface Engineering, Volume 26, Number 6, August 2010 , pp. 491-496(6)

Publisher: Maney Publishing

Abstract:

NiTi alloys were sprayed on AISI 1045 steel substrate using high velocity oxyfuel process. In this regard, amorphous/nanocrystalline NiTi powders were used as feedstock. The phase composition and microstructure of the coatings were examined by X-ray diffraction and scanning electron microscopy. The results indicated that B2-NiTi (austenite phase), Ni₄Ti₃, Ni and NiTiO₃ were present in the coatings. In addition, all sprayed coatings showed high microhardness values (>588 HV0·3). Further investigations showed that with the increase in fuel/oxygen ratio, the oxide content increased and porosity level decreased. Hereon, a dense coating with porosity level of 0·8% and oxide content of 5% was obtained as the optimum coating. Polarisation tests were employed to study the corrosion behaviour of the optimum coating in 3·5%NaCl solution. These tests indicated that the corrosion current density of the optimum coating is comparable to that of NiTi alloys reported in the literature.

Keywords: POROSITY; HIGH VELOCITY OXYFUEL; CORROSION; NITI COATINGS; INTERMETALLICS; MICROHARDNESS

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708410X12593178265823

Affiliations: 1: Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;, Email: m.verdianrizi@ma.iut.ac.ir 2: Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran

Publication date: 2010-08-01

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