Studio del comportamento a corrosione dell’acciaio inossidabile AISI 316L prodotto mediante diverse tecnologie di additive manufacturing = Study of the corrosion behavior of AISI 316L stainless steel produced using different additive manufacturing technologies

The aim of the present work is to evaluate the localized corrosion behaviour of an AISI 316L stainless steel alloy produced using different additive manufacturing technologies, comparing it with products manufactured through conventional way. Potentiodynamic polarization and critical pitting temperature (CPT) tests were carried out. The results of the potentiodynamic polarization tests showed differences in breakdown potentials between materials produced with additive technologies and those produced by traditional methods. The CPT tests yielded results consistent with those observed in the potentiodynamic tests. The results of CPT tests are in agreement with the potentiodynamic tests, confirming that the pitting corrosion behaviour is strictly dependent upon the additive manufacturing technologies. The article stresses once more the importance of defining suitable protocols for the corrosion qualification of alloys obtained by additive manufacturing that take into account the specificity of the production process and the treatments performed on the alloys themselves.