Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11076
Title: NiTi cladding on stainless steel by TIG surfacing process Part II. Corrosion behavior
Authors: Cheng, FT
Lo, KH
Man, HC 
Keywords: AISI 316 stainless steel
Corrosion
Galvanic effect
NiTi
Issue Date: 2003
Publisher: Elsevier
Source: Surface and coatings technology, 2003, v. 172, no. 2-3, p. 316-321 How to cite?
Journal: Surface and coatings technology 
Abstract: Thick NiTi coatings were deposited on AISI 316 stainless steel samples by the tungsten inert gas (TIG) surfacing process. In Part I, the composition, microstructure and cavitation erosion behavior of the NiTi deposit were investigated. In Part II, the corrosion behavior of the NiTi deposit in 3.5% NaCl solution at ambient temperature was studied by electrochemical methods. Based on the results of cyclic potentiodynamic polarization tests, the corrosion resistance of the NiTi deposit in NaCl solution was found to be comparable to, but lower than, that of AISI 316. Compared with bulk NiTi, the corrosion resistance of the TIG-deposited cladding was reduced due to the presence of pores and a more heterogeneous microstructure. The galvanic effect between the NiTi deposit and the 316 steel substrate was minimal, as evidenced by a low galvanic current density relative to the uncoupled corrosion current density for the anodic member. The results of these corrosion tests indicate that TIG-deposited NiTi cladding is compatible with AISI 316 stainless steel and may be employed as local protection against cavitation erosion in NaCl solutions.
URI: http://hdl.handle.net/10397/11076
ISSN: 0257-8972
EISSN: 1879-3347
DOI: 10.1016/S0257-8972(03)00346-3
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