Corrosion of nanocrystalline Ni-W alloys in alkaline and acidic 3.5 wt.% NaCl solutions

TitleCorrosion of nanocrystalline Ni-W alloys in alkaline and acidic 3.5 wt.% NaCl solutions
Publication TypeJournal Article
Year of Publication2011
AuthorsChianpairot, A, Lothongkum, G, Schuh, CA, Boonyongmaneerat, Y
JournalCorrosion Science
Volume53
Issue3
Pagination1066 - 1071
Date Published2011/03//
Abstract

The corrosion behaviour of reverse-pulse electrodeposited nanocrystalline nickel tungsten alloys (nc Ni-W) in pH 3 and 10 3.5 wt.% NaCl solutions is investigated and analysed as a function of grain size. A potentiodynamic polarisation study reveals that the corrosion rate of nc Ni-W generally increases with the reduction of grain size in alkaline condition, but decreases with the reduction of grain size in acidic environment. Furthermore, for both environments, nc Ni-W alloys exhibit superior localised corrosion resistance than a microcrystalline Ni control specimen. Factors controlling the corrosion behaviour of these materials, including grain size, tungsten content, passivation and crystallographic texture are addressed. (C) 2010 Elsevier Ltd. All rights reserved.