Corrosion behaviour of magnetron sputtered α- and β-Ta coatings on AISI 4340 steel as a function of coating thickness

Document Type

Article

Publication Date

8-1-2006

Abstract

The corrosion behaviour of magnetron sputtered α- and β-Ta coated AISI 4340 steels was studied with potentiodynamic polarization and electrochemical impedance spectroscopy. The coating porosity was observed to decrease with increasing coating thickness. For coatings less than 10 μm thick (α- or β-Ta), porosity was significant and open pores resulted in severe localized corrosion of the steel substrate, coating delamination, and overall coating failure. Additionally, the β-Ta coatings were more susceptible than the α-phase to delamination. As for the 50 and 100 μm thick α-Ta coatings, the electrochemical impedance behaviour was comparable to that of Ta foil, demonstrating the coating viability and corrosion resistance. © 2005 Elsevier Ltd. All rights reserved.

Identifier

33746257006 (Scopus)

Publication Title

Corrosion Science

External Full Text Location

https://doi.org/10.1016/j.corsci.2005.08.007

ISSN

0010938X

First Page

2154

Last Page

2171

Issue

8

Volume

48

Grant

DAAE30-98-C-1050

Fund Ref

Nanjing Institute of Technology

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