Additive manufacturing (AM) is gaining increasing interest in various strategic industrial sectors such as Oil & Gas, aerospace, and chemical industries. This group of technologies includes both innovative yet well-established techniques and more recent methods like Material Extrusion (MEX). This technique shows several advantages over other AM techniques, including high deposition rates and simplicity in feedstock material handling; however, it presents numerous endogenous macro-defects that can affect the corrosion resistance. The relationship between the defects of this technology and its corrosion behaviour still needs to be thoroughly investigated. This work studies the relationship between microstructure, internal defects, and corrosion behaviour in reducing acidic environments of alloy 625 obtained through MEX, compared to the same alloy obtained with traditional technology. The results lay the groundwork for further studies aimed to study the relationship between microstructure and corrosion behaviour of alloy 625 obtained with other AM technologies. © 2025 Associazione Italiana di Metallurgia. All rights reserved.

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