Abstract Scope |
Compared to fusion-based additive manufacturing (AM) such as laser powder bed fusion (L-PBF), binder jet printing (BJP), aka a non-beam-based process, utilizes a powder feedstock and an inkjet printhead to shape metal powders into preforms that are then processed in a furnace to reach near-full density. Based on the AM processing, as-fabricated parts show different microstructures in which columnar grain structures with fine solidification cells are common in L-PBF steels, while fine equiaxed grains with some annealing twins are seen in BJP steels. Here, corrosion behavior of AM fabricated steels will be studied. Surface topography, porosity, surface oxide composition, and electrochemical characteristics, including pitting corrosion, dynamic polarization, and electrochemical impedance spectroscopy are investigated at room temperature in different electrolytes. Results are compared to corrosion behavior of wrought and cast steel alloys. The nature of passive film structure and its impact on the corrosion resistance of AM fabricated parts are discussed. |