Mudassir Farooq, Muhammad Sohail Hanif and Ahmad Sorour
Keywords: Corrosion, Powder Metallurgy, Amorphous Alloy Powder, Passive Film
Abstract:
<p>In
this study, the corrosion behavior of a Fe-Cr-Mo-B-C alloy which was fabricated
by spark plasma sintering of an amorphous alloy powder, in 3.5% NaCl solution was
analyzed. Electrochemical impedance spectroscopy and potentiodynamic
polarization are techniques which were used for electrochemical performance
estimation of samples and the results were further compared with conventional
alloys: 1080 carbon steel and 304 stainless steel. Corrosion surface products
were characterized through scanning electron microscopy,
energy dispersive x-ray spectroscopy and x-ray photoelectron spectroscopy.
Specimens sintered at 800⁰C (S1-800) had achieved 94% densification
approximately while the sample sintered at 900⁰C (S2-900), had densified more which was 98%
approximately. S2-900 had better corrosion resistance than S1-800 while in
comparison to conventional alloys; it was inferior to 304 stainless steel. It was concluded that the increase in density of
sintered samples favoured the formation of more uniform surface products and
enhanced the formation of the passive chromium oxide (Cr<sub>2</sub>O<sub>3</sub>)
layer.<br></p>
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