Electrochemical Characteristics of 410 Stainless Steel Produced by MIM Process through EIS Method under SSRT Test

Abstract:

In this experiment two kinds of 410L stainless steel, i.e., the first one is prepared by the I/M process and the second one is prepared by MIM process were used, and their corrosion behavior under stress in deionized water and the aqueous solution of 0.01kmol·m^-3HCl+1.72mol·m^-3MgCl₂ (pH=2.33) has been investigated by Electrochemical Impedance Spectroscopy (hereafter shortened as EIS) under Slow Strain Rate Tensile (hereafter shortened as SSRT) test. The charge transfer resistance (R_ct) of the I/M specimen is larger than that of the MIM specimen irrespective of under stress or non-stress, which means that the I/M specimen has the better corrosion resistance than the MIM specimen in the 0.01kmol·m^-3HCl+1.72mol·m^-3MgCl₂ (pH=2.33) solution. It was also confirmed from the fracture surface observation that hydrogen embrittlement occurred on the MIM specimen in the aqueous solution of 0.01kmol·m^-3HCl+1.72mol·m^-3MgCl₂ (pH=2.33). This result would be confirmed to be due to the existing impurities and defects in the MIM specimen.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 2008-2013
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.2008
• Online since: January 2012
• Authors: Satoshi Sunada, Norio Nunomura, Kazuhiko Majima
• Keywords: Corrosion Resistance, Electrochemical Impedance Spectroscopy (EIS), Hydrogen Embrittlement, Metal Injection Molding (MIM), Slow Strain Rate Tensile, SUS410

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