Open AccessElectrochemical Studies of Passive Film Stability on Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4 Amorphous Metal in Seawater at 90oCElectrochemical Studies of Passive Film Stability on Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4 Amorphous Metal in Seawater at 9
Author(s) -
Joseph C. Farmer,
J Haslam,
S D Day,
Tiangan Lian,
C. K. Saw,
P Hailey,
Jin Sung Choi,
R B Rebak,
Nancy Yang,
Joe H. Payer,
John H. Perepezko,
K Hildal,
E.J. Lavernia,
L. Ajdelsztajn,
D. J. Branagan,
E J Buffa,
L Aprigliano
Publication year - 2007
Language(s) - English
Resource type - Reports
DOI - 10.2172/1046111
Subject(s) - materials science , corrosion , metallurgy , amorphous solid , amorphous metal , tungsten , molybdenum , electrochemistry , coating , ribbon , boron , thermal stability , alloy , seawater , composite material , chemical engineering , chemistry , organic chemistry , electrode , engineering , oceanography , geology
An iron-based amorphous metal, Fe{sub 49.7}Cr{sub 17.7}Mn{sub 1.9}Mo{sub 7.4}W{sub 1.6}B{sub 15.2}C{sub 3.8}Si{sub 2.4} (SAM2X5), with very good corrosion resistance was 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