Improvement Corrosion Resistance of Gray Cast Iron Grade FC220 on Chromizing Process by Separate Cr Powder and NH₄Cl Powder System

Abstract:

A new configuration of chromizing process was developed by separating Cr powder from NH₄Cl. FC220 gray cast iron specimens were chromized in this new experimental setup at 450, 550, 650,750, 850 and 950°C during 13 hours in order to study the possibility of chromizing at “low” temperature. The chromized specimens were examined using Scanning Electron Microscopy (SEM), macro-hardness, micro-hardness, compression test and salt spray test. The results shows that the specimen chromized at 650°C gives the best compromise between the corrosion resistance and the hardness of the FC220 with 1.73 ڌm of thickness of the chromized layer. However, after 13 hours of the process, the hardness of the FC220 specimens decreased considerably from 93 HRB to 64.2 HRB (31%).

• Periodical: Applied Mechanics and Materials (Volumes 799-800)
• Pages: 397-401
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.799-800.397
• Online since: October 2015
• Authors: Pudsadee Chupong*, Pijan Jornsanoh, Karuna Tuchinda, Anantawit Tuchinda
• Keywords: Chromizing Process, Corrosion Resistance, Cr, Gray Cast Iron

References

[1] Assoc. Prof. Manus Sathirajinda, CAST IRON, p.7 – 8 (2000).

[2] Jamrus Jan-in, Pajaree Srigiofun, Saralee Jamorntamakul, Study on effect of temperature and time chromizing process in various steels, Senior project Engineering Faculty Materials Field King Mongkut's University of Technology Thonburi, p.8 – 11.

[3] Yu. G. Gurevich, V. E. Ovsyannikov, and V. A. Frolov, Diffusion chromizing of gray cast iron by reaction with chromium oxide, Metallurgist, Vol. 55 (2012), pp.854-858.

DOI: 10.1007/s11015-012-9513-z

[4] F.J. Peérez, F. Pedraza, M.P. Hierro, M.C. Carpintero, and C. Goémez, Chromising of stainless steels by the use of the CVD-FBR technology, Surface and Coatings Technology, Vol. 184(2004), p.47 – 54.

DOI: 10.1016/j.surfcoat.2003.08.089

[5] D.M. Fabijanic, G.L. Kelly, J. Long, and P.D. Hodgson, A nitrocaburising and low temperature chromising duplex surface treatment, Materials Forum, Vol. 29(2005), p.77 – 82.

[6] Hongyan Wua, Pingze Zhang, Ling Wanga, Haofeng Zhao, and Zhong Xu, The role of process parameters in plasma surface chromising of Ti2AlNb-based alloys, Applied Surface Science, Vol. 256(2009), p.1333 – 1340.

DOI: 10.1016/j.apsusc.2009.07.076

[7] A. DEMIR, R. SAMUR, and I. KILIÇASLAN, Investigation of the coatings applied onto brake discs on disc - brake pad pair, METABK, Vol. 48(2009), No. 3, pp.161-166.

[8] Z.B. Wang, J. Lu, and K. Lu, Wear and corrosion properties of a low carbon steel processed by means of SMAT followed by lower temperature chromizing treatment, Surface and Coatings Technology, Vol. 201(2006), p.2796–2801.

DOI: 10.1016/j.surfcoat.2006.05.019