The SCC (Stress Corrosion Cracking) behavior of the MIM (Metal Injection Molding) 304 stainless steel specimen in aqueous solutions containing 2.5 kmol·m−3 H2SO4 and NaCl of varying concentrations was studied in comparison with that of I/M (Ingot Metallurgy) 304 stainless steel specimen. Both MIM and I/M specimens showed the SCC in the aqueous solutions containing 2.5 kmol·m−3 H2SO4 and NaCl of particular concentration ranges, and the general corrosion in the solutions of the other NaCl concentration ranges.
The V-shape plots were obtained in the relationship between the corrosion mass loss against NaCl concentration for both I/M and MIM specimens, in which the NaCl concentration of the MIM specimen showing the minimum corrosion mass shifted to the higher concentration side than that of the I/M specimen. The similar V-shape plots were obtained in the relationship between the crack length against NaCl for both MIM and I/M specimens, in which the NaCl concentration of the MIM specimen showing the maximum crack length shifted to the higher concentration side than that of the I/M specimen. The concentration ranges of NaCl for the minimum peak of corrosion mass loss and for the maximum peak of crack length are approximately the same.