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Corrosion resistance of thermally sprayed high-boron iron-based amorphous-metal coatings: Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4

Published online by Cambridge University Press:  31 January 2011

J.C. Farmer ,
J.J. Haslam ,
S.D. Day ,
T. Lian ,
C.K. Saw ,
P.D. Hailey ,
J-S. Choi ,
R.B. Rebak ,
N. Yang  and
J.H. Payer
...Show all authors
J.C. Farmer*
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551-0808
J.J. Haslam
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551-0808
S.D. Day
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551-0808
T. Lian
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551-0808
C.K. Saw
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551-0808
P.D. Hailey
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551-0808
J-S. Choi
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551-0808
R.B. Rebak
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551-0808
N. Yang
Affiliation:
Sandia National Laboratory, Livermore, California 94551
J.H. Payer
Affiliation:
Case Western Reserve University, Cleveland, Ohio 44106-7204
J.H. Perepezko
Affiliation:
University of Wisconsin, Madison, Wisconsin 53706
K. Hildal
Affiliation:
University of Wisconsin, Madison, Wisconsin 53706
E.J. Lavernia
Affiliation:
University of California, Davis, California 95616
L. Ajdelsztajn
Affiliation:
University of California, Davis, California 95616
D.J. Branagan
Affiliation:
The NanoSteel Company, Idaho Falls, Idaho 83402
E.J. Buffa
Affiliation:
The NanoSteel Company, Idaho Falls, Idaho 83402
L.F. Aprigliano
Affiliation:
Strategic Analysis, Arlington, Virginia 21811
*
a)Address all correspondence to this author. e-mail: farmer4@llnl.gov
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Abstract

An iron-based amorphous metal, Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4 (SAM2X5), with very good corrosion resistance has been developed. This material was prepared as a melt-spun ribbon, as well as gas atomized powder and a thermal-spray coating. During electrochemical testing in several environments, including seawater at 90 °C, the passive film stability was found to be comparable to that of high-performance nickel-based alloys and superior to that of stainless steels, based on electrochemical measurements of the passive film breakdown potential and general corrosion rates. This material also performed very well in standard salt fog tests. Chromium (Cr), molybdenum (Mo), and tungsten (W) provided corrosion resistance, and boron (B) enabled glass formation. The high boron content of this particular amorphous metal made it an effective neutron absorber and suitable for criticality control applications. This material and its parent alloy maintained corrosion resistance up to the glass transition temperature and remained in the amorphous state during exposure to relatively high neutron doses.

Keywords

AmorphousCorrosionCoating
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 8 , August 2007 , pp. 2297 - 2311
Copyright
Copyright © Materials Research Society 2007

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