Additive Manufacturing: Corrosion Proofing by Infusion of Interstitial Solute—Exemplified for Alloy 22

The corrosion resistance of Cr-containing alloy parts made by additive manufacturing can be significantly improved a post-treatment gas-phase-based infusion concentrated interstitial solute (carbon and nitrogen). We demonstrate this universal approach for the example low-temperature nitrocarburization solid-reagent pyrolysis applied to Alloy 22 (UNS N06022) laser powderbed fusion. show that improves crevice-corrosion these parts, as well corresponding from wrought surpass maximum crevice test temperature specified in ASTM G48-D, whereas non-treated samples typically fail below. Similarly, cyclic potentiodynamic polarization testing (ASTM G61-86) demonstrates makes additively manufactured more corrosion-resistant than alloy.