Effect of Chromium on the Corrosion Behavior of Powder-Processed Fe-0.35 wt % P Alloys


The corrosion behaviour of phosphoric irons (i.e. Fe-P alloys containing low phosphorous in the range 0.1 to 0.7 wt. %) with/without addition of chromium, 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, chromium improved the resistance to corrosion in all the environments. Corrosion rates were higher in acid medium due to the enhanced hydrogen evolution and hence, the cathodic reaction. The corrosion rates were minimal in alkaline medium and low in neutral solution.

Share and Cite:

Y. Mehta, S. Trivedi, K. Chandra and P. Mishra, "Effect of Chromium on the Corrosion Behavior of Powder-Processed Fe-0.35 wt % P Alloys," Journal of Minerals and Materials Characterization and Engineering, Vol. 8 No. 7, 2009, pp. 501-511. doi: 10.4236/jmmce.2009.87044.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Fontana M. G. 2006 Corrosion Engineering McGraw-Hill International Edition 3rd ed. pp. 23–27 and pp. 499–503.
[2] Lorbeer, P., and Lorenz, W. J., 1980,”The Kinetics of Iron Dissolution and Passivation in Solutions Containing Oxygen, Electrochim. Acta,” Vol. 25, pp. 375–381.
[3] Vera, R., Rosales, B. M., and Tapia, C., 2003, “Effect of the Exposure Angle in the Corrosion Rate of Plain Carbon Steel in a Marine Atmosphere,” Corros. Sci., Vol. 45, pp. 321–337.
[4] Parkins, R. N., 1990, Environment-Induced Cracking of Metals (Edited by Gangloff, R. P. and Ives, M. B.), NACE, Houston, p. 1.
[5] Stencel, H., Vehoff, H. and Neumann, P., 1987 Chemistry and Physics of Fracture (Edited by Latanision, R. M. and Jones, R. H.), Martinus Nijhoff, Dordrecht p. 652.
[6] Cleary H J Greene N D 1967 “Corrosion Properties of Iron and steel” Corrosion Science Vol 7 pp. 821-831
[7] Hudson J C Stanners J F 1955 “The Corrosion Resistance of Low- Alloy Steels” Journal Of The Iron And Steel Institute 180 pp271-284
[8] Balasubramaniam, R., 2000,”On the Corrosion Resistance of the Delhi Iron Pillar,” Corros. Sci., Vol. 42, pp. 2103–2129.
[9] Balasubramaniam, R. and Ramesh Kumar, A. V., 2000, “Characterization of Delhi Iron Pillar Rust by X-Ray Diffraction, Fourier Infrared Spectroscopy, M?ssbauer Spectroscopy,” Corros. Sci., Vol. 42, pp. 2085–2101.
[10] Sahoo, Gadadhar, and Balasubramaniam, R., 2008, “Corrosion of Phosphoric Irons in Acidic Environments, Journal of ASTM International[Paper ID JAI101191],” Vol. 5, No. 5, pp 1-7.
[11] Trivedi S Mehta Y Chandra K Mishra P S 2009 “Effect of Chromium on the Mechanical Behavior of Powder-Processed Fe-0.35 wt % P Alloys” (communicated)
[12] ASTM Standard G3-89, Standard Practice for Conventions Applicable to Electrochemical Measurements in Corrosion Testing. Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA, Vol. 3.02, 2006.
[13] ASTM Standard G102-89, Standard Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements. Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA, Vol. 3.02, 2006.
[14] Ijsseling, F. P., Application of Electrochemical Methods of Corrosion Rate Determination to System Involving Corrosion Product Layers, Br. Corros. J., London, Vol. 21, 1986, pp. 95–101.
[15] Flitt, H. J., and Schweinsberg, D., Evaluation of Corrosion Rate from Polarization Curves Not Exhibiting a Tafel Region, Corros. Sci., Vol. 47, 2005, pp. 3034–3052.
[16] Davydov, A., Rybalka, V., Beketaeva, L., Engelhardt, G., Jayaweera, P., and Macdonald, D., The Kinetics of Hydrogen Evolution and Oxygen Reduction on Alloy 22, Corros. Sci., Vol. 47, 2005, pp. 195–215.
[17] McCafferty, E., Validation of Corrosion Rates Measured By the Tafel Extrapolation Method, Corros. Sci., Vol. 47, 2005, pp. 3202–3215.
[18] Dexter, S. C., Handbook of Oceanographic Engineering Materials, John Wiley & Sons, New York, 1979, p. 111.
[19] Sikora, E., Sadkowski, A. and Flis, J., Impedance study of effect of phosphorus on anodic behavior of iron in carbonate/bicarbonate solutions, Electrochimica Acta, Vol. 38, No. 16, 1993 pp. 2443-2447.

Copyright © 2024 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.