SSRT条件下におけるMIM法により作製されたSUS304ステンレス鋼の腐食特性 [in Japanese] Corrosion Behavior of Type 304 Stainless Steel Produced by MIM Process under SSRT Condition [in Japanese]
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In this study, the corrosion behavior of MIM (Metal Injection Molding) specimen has been investigated by SSRT (Slow Strain Rate Tensile) test and EIS (Electrochemical Impedance Spectroscopy) method in comparison with I/M (Ingot Metallurgy) specimen. In the SSRT test, the aqueous solution composed of 2.5 kmol·m<SUP>−3</SUP> H<SUB>2</SUB>SO<SUB>4</SUB> and 0.20 kmol·m<SUP>−3</SUP> NaCl (hereafter shortened as SCC solution) in which SCC occurs was used. In addition to this solution, the aqueous solution of 2.5 kmol·m<SUP>−3</SUP> H<SUB>2</SUB>SO<SUB>4</SUB> and 3.0 kmol·m<SUP>−3</SUP> NaCl (hereafter shortened as general corrosion solution) in which general corrosion occurs was used in the EIS test.<BR><I>C</I><SUB>dl</SUB> (Electric Double Layer Capacitance) of I/M specimen has increased abruptly at 7.2 ks during holding in the SCC solution under applied stress, while it has increased gradually without applied stress. On the other hand, the <I>C</I><SUB>dl</SUB> of MIM specimen has increased gradually increased irrespective of with or without applied stress for MIM specimen. The remarkable <I>R</I><SUB>ct</SUB> difference was observed in two cases with or without applied stress in the SCC solution for both I/M and MIM specimen while the slight <I>R</I><SUB>ct</SUB> difference was observed in the general corrosion solution. The fracture surface appearance by SEM showed that the typical transgranular SCC occurred on I/M specimen while the intergranular SCC along grain boundaries occurred on MIM specimen. It was also confirmed that the more significant HE-SCC (Hydrogen Embrittlement) and the weaker APC-SCC (Active Path Corrosion) were observed on the MIM specimen compared with the I/M specimen.
- Journal of the Japan Society of Powder and Powder Metallurgy
Journal of the Japan Society of Powder and Powder Metallurgy 54(5), 336-344, 2007-05-15
Japan Society of Powder and Powder Metallurgy