Abstract
Corrosion behavior of SUS304 stainless steels sintered in vacuum or (H2+N2) gas atmospheres with various compositions was studied by polarization curve measurement test, immersion test and 0.5 kmol·m−3 H2SO4 boiling test. The sintered density ratio of the SUS304 stainless steel specimen sintered in pure H2 gas was the highest, while it decreased with increasing N2 content in the (H2+N2) mixed gas. On the other hand, the specimen sintered in vacuum showed the second highest density ratio. And the linear relationship between sintered density ratio and N2 content was recognized. Both corrosion current densities at Ecorr and at 0.5 V in passivity state region showed the almost linear relationship against sintered density. The mass loss measured by immersion test also decreased linearly with an increase in sintered density, while that by 0.5 kmol·m−3 H2SO4 boiling test did not show the linear decrement though it decreased gradually with increasing sintered density.
