Pitting corrosion of 17-4PH stainless steel manufactured by laser beam melting

Adrien Barroux (1) , Nadège Ducommun (2) , Eric Nivet (2) , Lydia Laffont (1) , Christine Blanc (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 CEntre Technique des Industries Mécaniques - Cetim (FRANCE)

The pitting corrosion behaviour of a 17-4PH martensitic stainless steel (MSS) manufactured by power bed laser beam melting (LBM) was compared to that of a wrought MSS. More noble pitting potentials were measured for LBM samples, probably due to a smaller size of NbCs as compared to wrought MSS. The metastable pits were less numerous, but had a higher nucleation rate and longer life time for the LBM samples compared to the wrought MSS. This was explained by assuming a decrease in the repassivation ability of LBM samples due to small gas pores

Mots clés: A. Stainless steel; B. Polarisation; B. TEM; C. Passivity; C. Pitting corrosion

Domaines: Matériaux

Adrien Barroux, Nadège Ducommun, Eric Nivet, Lydia Laffont, Christine Blanc. Pitting corrosion of 17-4PH stainless steel manufactured by laser beam melting. Corrosion Science, 2020, 169, pp.108594. ⟨10.1016/J.CORSCI.2020.108594⟩. ⟨hal-03165278⟩