Effect of Silicon on the Corrosion Behavior of Powder-Processed Phosphoric Irons
- 1 Indian Institute of Technology, Roorkee- 247667, Uttarakhand, India
- 2 Indian Institute of Technology, Roorkee- 247667, Uttarakhand, India
- 3 Indian Institute of Technology, Roorkee- 247667, Uttarakhand, India
- 4 Indian Institute of Technology, Roorkee- 247667, Uttarakhand, India
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 H 2 SO 4 solution of pH 0.6), neutral/marine (3.5 % NaCl solution of pH 6.8) and alkaline (0.5M Na 2 CO 3 + 1.0 M NaHCO 3 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.
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