Flow assisted corrosion characteristics of spark plasma sintered DSS 2205 - TiN in 3.5% NaCl

Materials development via spark plasma sintering is on the increase due to its versatility in producing wide variety of new and emerging materials in the realm of consolidating metallic/ceramic powders, and joining dissimilar materials among others. The sintered products are characterized with superior mechanical, tribological and chemical behaviour. However, the limitation is that the underlying principles are still under consideration. This paper provides information on the flow induced corrosion behaviour of reinforced DSS 2205-TiN manufactured by spark plasma sintering in 3.5% NaCl. The TiN reinforcement was added within the range of 0 - 8% at interval of 2% and the spark plasma sintering parameters were conducted as follows: sintering temperature (1150^oC), sintering time (10 mins), applied pressure (50 Mpa) and heating rate (100^oC/mins). The sintered samples were subjected to both gravimetric and using electrochemical measurement in 3.5% NaCl at flow velocity of 1.0 m/s and increasing at 0.5 m/s till 2.5 m/s. A field emission scanning electron microscope (FESEM) equipped with energy dispersive x-ray spectrometer (EDS) was employed to carry out the microstructural characterizations of the corroded sintered products. The results showed that increasing the flow velocity decreased the passive current but results in more positive corrosion potential of the sintered products. The active - passive behaviour and the role of microstructures on the reinforced sintered composites in 3.5% NaCl are discussed.