The Effect of Oxides Additives on Anti-corrosion Properties of Sintered 316L Stainless Steel

Abstract

<p>As wrought stainless steel, sintered stainless steel (STS) has excellent high-temperature anti-corrosion even at high temperature of 800ºC and exhibit corrosion resistance in air. The oxidation behavior and oxidation mechanism of the sintered 316L stainless was reported at the high temperature in our previous study. In this study, the effects of additives on high-temperature corrosion resistances were investigated above 800ºC at the various oxides (SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, MgO and Y<sub>2</sub>O<sub>3</sub>) added STS respectively as an oxidation inhibitor. The morphology of the oxide layers were observed by SEM and the oxides phase and composition were confirmed by XRD and EDX. As a result, the weight of STS 316L sintered body increased sharply at 1000oC and the relative density of specimen decreased as metallic oxide addition increased. Compared with STS 316L sintered parts, weight change ratio corresponding to different oxidation time at 900oC and 1000oC, decreased gradually with the addition of metallic oxide. The best corrosion resistance properties of STS could be improved in case of using Y<sub>2</sub>O<sub>3</sub>. The oxidation rate was diminished dramatically by suppression the peeling on oxide layers at Y<sub>2</sub>O<sub>3</sub> added sintered stainless steel.</p>