Corrosion of a spark plasma sintered Fe-Cr-Mo-B-C alloy in 3.5% NaCl solution

Mudassir FAROOQ; Sohail MUHAMMAD; A. A.  SOROUR

doi:10.55713/jmmm.v33i1.1588

Authors

Mudassir FAROOQ Department of Mechanical Engineering, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia; Department of Materials Engineering, NED University of Engineering and Technology, Karachi 75270, Pakistan
Sohail MUHAMMAD Department of Materials Engineering, NED University of Engineering and Technology, Karachi 75270, Pakistan
A. A. SOROUR Department of Mechanical Engineering, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia; Interdisciplinary Research Center for Advanced Materials, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia

DOI:

https://doi.org/10.55713/jmmm.v33i1.1588

Keywords:

Corrosion, Powder Metallurgy, Amorphous Alloy Powder, Passive Film

Abstract

In this study, the corrosion behavior of a Fe-Cr-Mo-B-C alloy, 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 800℃ (S1-800) had achieved 94% densification approximately while the sample sintered at 900℃ (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 (Cr₂O₃) layer.

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