The green SUS304 stainless steel powder compacts were prepared by the conventional die and warm die compaction. Then they were sintered at 1393 K, 1473 K and 1523 K in three kinds of atmospheres, i.e. N2 gas, Ar gas and vacuum, and their corrosion behavior were investigated by the electrochemical procedure. Both mass losses of the specimens prepared by conventional compaction or warm compaction decreased almost linearly with an increase in sintered density ratio. The data points, however, fall on two different straight lines. The measurement of electrochemical reactivation ratio was carried out by the newly developed method in this study, and it was confirmed that the reactivation ratio of the specimen sintered in N2 gas was lower than those of the specimens sintered in Ar or vacuum. This result suggests that the specimen sintered in N2 gas has less corrosion resistance than those sintered in Ar or vacuum.
