The Effect of Nickel Addition on the Corrosion Behaviour of Sintered Stainless Steel in H sub 2 SO sub 4

The influence of Ni addition on the corrosion behaviour of hot sintered stainless steel of type 316 in H sub 2 SO sub 4 solution was investigated. It was found that Ni additions enhance the passivation processes of the hot-pressed stainless steel. The corrosion resistance was substantially improved by the Ni addition after 48 h of sintering, and the weight loss was negligible as compared to corrosion up to total loss identified in the hot-pressed and sintered 316 stainless steel. It is suggested that threshold microstructure conditions are necessary for the passivation processes of sintered stainless steel, depending on the alloying element. 17 ref.--AA