Study on the corrosion resistance of the sintered UNS S31603 powder with molybdenum disulfide using electrochemical techniques and acoustic emission spectroscopy

Abstract This research was to study the corrosion behavior of 316L stainless steel sheet, the sintered of 316L stainless steel mixed with 0, 5, 10 and 15 wt% of MoS 2 using the electrochemical techniques and the acoustic emission spectroscopy (AE). The specimens with the specific compositions of MoS 2 were prepared and sintered. The microstructures of the specimens were studied using the optical and scanning electron microscopy (SEM). The tensile strength and hardness of the specimens were determined. The AE was used to monitor the signals which were released during the potentiodynamic tests in the 0.1, 0.3 and 0.5 M of sodium chloride solution. The results showed that the microstructures of 15wt% MoS 2 had the highest fraction of eutectic phase. The tensile strength of sintered 316L added with 0, 5, 10 and 15 wt% MoS 2 were 315, 299, 296 and 281 MPa, respectively. In addition, the addition of MoS 2 resulted in the hardness increasing. However, the corrosion resistance was found decreasing in the sintered 316L stainless steel with MoS 2 addition. The AE signal could be detected when the corrosion current of sintered stainless steel reached the value of 250 µA.