Hits:

Indexed by:期刊论文

Date of Publication:2008-05-25

Journal:SURFACE & COATINGS TECHNOLOGY

Included Journals:SCIE、EI

Volume:202

Issue:17

Page Number:4137-4144

ISSN No.:0257-8972

Key Words:sediment co-deposition; nano-Al2O3 composite coatings; corrosion resistance; high temperature oxidation resistance

Abstract:Ni-Al2O3 composite coatings were prepared by using sediment co-deposition (SCD) technique from a Watt's type electrolyte containing nano-Al2O3 particles. The corrosion resistance and high temperature oxidation resistance of resulting composite coatings were investigated. It was found that the incorporation of nano-Al2O3 particles in Ni matrix refined the Ni crystal and changed the preferential orientation of composite coatings. Meanwhile, the corrosion and oxidation resistance were improved after the incorporation of nano-Al2O3 particles into Ni matrix. The nano-Al2O3 content in deposits plays an important role for improving the corrosion and oxidation protection. The corrosion and oxidation resistance of Ni-Al2O3 nano-composite coatings produced via SCD technique are superior to that of CEP technique. Compared to pure Ni and Ni-Al2O3 composite coatings fabricated using CEP technique, the Ni-7.58 wt.% Al2O3 composite coating obtained by SCD technique exhibits better corrosion resistance and enhanced high temperature oxidation resistance. Moreover, the mechanism of corrosion and high temperature oxidation resistance of Ni-Al2O3 nano-composite coatings are discussed. (C) 2008 Elsevier B.V. All rights reserved.