In general, PM stainless steel parts have inferior corrosion resistance to their wrought counterparts. Furthermore, the variation in surface porosity and oxide layers exhibited by sintered PM parts can lead to a considerable amount of uncertainty in corrosion resistance. In the present study addition of elements, which may modify or segregate to the surface of the powder, leading to enhanced corrosion resistance, are added prior to sintering. The effect of these elements on mechanical properties and corrosion resistance will be studied and compared to grades of stainless steel powder commercially available. The effect of processing variables such as sintering atmosphere and density will also be considered.
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