Corrosion Resistance of Sintered Stainless Steel Containing Nickel Based Additives

Abstract

The effect of nickel based brazing powder additions on the corrosion behaviour of sintered austenitic stainless steel in 0·5M H₂SO₄ has been investigated. It has been found that the corrosion resistance of the sintered mixture increased substantially and proportionally to the brazing powder content in the range 1–5 wt-%. The improvement in the corrosion resistance originates from the reduction in the open interconnected porosity due to the formation of a transient liquid phase. A corrosion resistance similar to wrought austenitic stainless steel was observed in the presence of 5 wt-% of fine particle additive. The presence of coarse particle additive has only a local effect and does not substantially affect the environmental behaviour of the sintered samples. PM/0610