3D printing by Laser-Powder Bed Fusion (L-PBF) is an innovative process using a high energy density laser to melt the raw material into a powder form. Previous studies have shown that the powder properties are crucial for the density, quality and microstructure of the materials produced [1, 2] but much remains unknown about their influence on corrosion behaviour. Therefore, the objective of this study is to establish the relationship between electrochemical reactivity of the raw material and the additively manufactured 316L stainless steel (SS). To this aim, cyclic voltammetry technique was performed using a cavity microelectrode (CME) densely filled with metal 316L powder (Fig. 1. A and B) and a sessile drop over the surface of L-PBF 316L SS (Fig. 2) in H2SO4 (0.5 mol.L-1) at room temperature. These configurations allow the use of small amounts of material, the reduction of the electrode size and consequently, smaller ohmic drop [3]. As a result, high-scan rate cyclic voltammetry can be applied, allowing faster measurements. In addition, the electrochemical droplet cell is of great interest to study corrosion processes of heterogeneous materials. The principle consists in placing directly a sessile drop of a few microliters on the material surface considered as the working electrode. By this way, the current and potential lines are limited to the small volume of the hemispherical cap. For a few microliter drop, the diameter of the covered surface is of the order of a millimetre and depends on the wettability of the material [4]. To complete the experimental setup, the reference electrode and the counter electrode are introduced inside the sessile drop (Fig. 1. C). Cyclic voltammetry measurements showed similar electrochemical reactivity between the metal powder and L-PBF 316L SS. Several analytical techniques were also used for the characterizations of powders and materials in order to explain the relationship between them (chemical composition and heterogeneities, precipitates, etc.).