Corrosion behavior and mechanism of laser powder bed fusion produced CoCrW in an acidic NaCl solution. (1st April 2023)

• Record Type: Journal Article
• Authors: Qin, P.; Chen, L.Y.; Liu, Y.J.; Zhao, C.H.; Lu, Y.J.; Sun, H.; Zhang, L.C.
• Is Part Of: Corrosion science. Volume 213(2023)
• Publication Date: 2023-04-01
• Subjects: Laser powder bed fusion -- CoCrW -- Immersion -- Corrosion -- Oxide film; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2023.110999
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The corrosion behavior and mechanism of the laser powder bed fusion (L -PBF) produced CoCrW were investigated in 0.9 wt% NaCl solution with a pH of 2. The corrosion resistance of the alloy increases after 28 days of immersion because of the formed oxide film, which results in the increased corrosion potential and the decreased passivation current density on the potentiodynamic polarization test. The corrosion mechanism of the L -PBF-produced CoCrW could be explained by the melt pool formed from the laser melting process, that the melt pools were "shrinking" by the formation and dissolution of the oxide film. Highlights: L -PBF-produced CoCrW was tested in an acidic NaCl solution (0.9 wt%). A 28-day immersion test on L -PBF-produced CoCrW was performed. The formed oxide film starts to be relatively unstable after 14 days of immersion. The corrosion of the alloy is related to the dissolution of the melt pool ("shrinks").