TITLE:
Effect of Silicon on the Corrosion Behavior of Powder-Processed Phosphoric Irons
AUTHORS:
Yashwant Mehta, Shefali Trivedi, K. Chandra, P.S. Mishra
KEYWORDS:
Phosphoric Iron, Corrosion, Powder Metallurgy, Forging, Ancient iron.
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.9 No.10,
October
20,
2010
ABSTRACT: The corrosion behaviour of phosphoric irons (i.e. Fe-P alloys containing low phosphorous
in the range 0.1 to 0.7 wt. % ) containing chromium with/without addition of silicon,
prepared by powder forging route was studied in different environments. The various
environments chosen were acidic (0.25 M H2SO4 solution of pH 0.6), neutral/marine (3.5 % NaCl solution of pH 6.8) and alkaline (0.5M Na2CO3 + 1.0 M NaHCO3 solution of pH 9.4).
The corrosion studies were conducted using Tafel Extrapolation and Linear Polarization
techniques. The studies compare electrolytic Armco iron with phosphoric irons. It was
observed that silicon improved the resistance to corrosion in all the environments. Corrosion
rates were higher in acid medium, minimal in alkaline medium and low in neutral solution.