Improving corrosion resistance of Q235 steel by Ni-Cr alloyed layer

Abstract

Ni-Cr alloyed layer was formed on surface of Q235 steel by double glow plasma surface metallurgy to improve the corrosion resistance of substrate. The composition and microstructure of alloyed layer was analyzed by SEM and XRD. Potentiodynamic polarization and electrochemical impedance spectroscopy was applied to evaluate the corrosion resistance of the alloyed layer. The results showed working pressure had a great effect on structure of Ni-Cr alloyed layer, and the dense and smooth alloyed layer was prepared at 50 Pa working pressure. Compared with substrate, Ni-Cr alloyed layer exhibited higher corrosion potential, lower corrosion current density and larger charge transfer resistance, which indicated that Ni-Cr alloyed layer significantly modified the corrosion resistance of Q235 steel.

Keywords

double glow plasma surface metallurgy / Ni-Cr alloyed layer / potentiodynamic polarization / electrochemical impedance spectroscopy / corrosion resistance

References

[1] Schmid T. E., Hecht R. Y. High Technology Ceramic Coatings-Current Limitations/Future Needs [J]. Ceramic Engineering and Science Proceedings, 1988, 9: 1 089-1 094.

[2] Aita C. R. Phase Maps for Sputter Deposited Refractory Metal Oxide Ceramic Coatings: Review of Niobium Oxide, Yttrium Oxide, and Zirconium Oxide Growth [J]. Materials Science and Technology, 1992, 8: 666-672.

[3] Huang N. K., Kheyrandish H., Colligon J. S. Microstructure of Zirconia Films Prepared by Argon Ion Beam Enhanced Deposition [J]. Physica Status Solidi (a), 1992, 132: 405-411.

[4] Gal-Or L., Silberman I., Chaim R. Electrolytic ZrO₂ Coatings [J]. Journal of Electrochemical Society, 1991, 138: 1 939-1 941.

[5] Thomas A., El-Wahabi M., Cabrera J. M., . High Temperature Deformation of Inconel 718[J]. Journal of Materials Processing Technology, 2006, 177: 469-472.

[6] Carranza R. M., Alvarez M. G. The Effect of Temperature on the Passive Film Properties and Pitting Behaviour of A Fe-Cr-Ni Alloy [J]. Corrosion Science, 1996, 38: 909-925.

[7] Kawakita J., Kuroda S., Fukushima T., . Corrosion Resistance of HVOF Sprayed HastelloyC Nickel Base Alloy in Seawater [J]. Corrosion Science, 2003, 45: 2 819-2 835.

[8] Sundararajan T., Kuroda S., abe F. Steam Oxidation Resistance of Twolayered Ni-Cr and Al APS Coating for USC Boiler Applications [J]. Corrosion Science, 2005, 47: 1 129-1 147.

[9] Sidhu B. S., Prakash S. Performance of NiCrAlY, Ni-Cr, Stellite-6 and Ni₃Al Coatings in Na₂SO₄-60% V₂O₅ Environment at 900 °C Under Cyclic Conditions [J]. Surface and Coatings Technology, 2006, 201: 1 643-1 654.

[10] Fernández E., García J. R., Cuetos J. M., . Behaviour of Laser Treated Cr, Ni Coatings in The Oxidative Atmosphere of A Steam Boiler [J]. Surface and Coatings Technology, 2005, 195: 1-7.

[11] Double X. Z. Glow Plasma Surface Alloying and Plasma Nitriding [J]. Surface and Coatings Technology, 2007, 201(9–11): 4 822-4 825.

[12] Zhang X., Xie X. S., Yang Z. M., . A Study of Nickel-based Corrosion Resisting Alloy Layer Obtained by Double Glow Plasma Surface Alloying Technique [J]. Surface and Coatings Technology, 2000, 131: 378-382.

[13] Matthes B., Broszeit E., Aromaa J., . Corrosion Performance of Some Titanium-base Hard Coatings [J]. Surface and Coatings Technology, 1991, 49: 489-495.

[14] Creus J., Mazille H., Idrissi H. Porosity Evaluation of Protective Coatings onto Steel, Through Electrochemical Techniques [J]. Surface and Coatings Technology, 2000, 130: 224-232.

[15] He Z. Y., Zhao J. X., Gao Y., . Study on Absorption Ratio of Alloy Elements in Plasma Ni-Cr Alloying by Double Glow Plasma Process [J]. Journal of Chinese Society for Corrosion and Protection, 1999, 19: 345-350.

[16] Li C. M., Tian L. H., Xu Z., . Sputtering of W-Mo Alloy Under Ion Bombardment [J]. Transactions on Nonferrous Metal Society of Chinese, 1999, 9: 629-633.

[17] Hanmdy A. S., Veccaria A. M., Spiniello R. The Effect of Cerium Pretreatment on The Corrosion Behaviour of Aluminium Composites[J]. Corrosion Prevention and Control, 2001, 48(3): 101-105.

[18] Zhang P. Q., Wu J. X., Zhang W. Q., . A Pitting Mechanism for Passive 304 Stainless Steel in Sulphuric Acid Media Containing Chloride Ions [J]. Corrosion Science, 1993, 34: 1 343-1 348.