The effects of heat treatment and surface state on the corrosion resistance of laser powder bed fusion 304L stainless steel in 3.5 wt% NaCl solution

The corrosion resistance of laser powder bed fusion (LPBF) 304L stainless steel (SS) in 3.5 wt% NaCl solution was evaluated at room temperature through potentiodynamic polarization and electrochemical impedance spectroscopy tests. For electropolished samples, annealing at 1200 °C slightly enhanced t...

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Bibliographic Details
Published in:Journal of materials research and technology 2024-03, Vol.29, p.5620-5632
Main Authors: Zhang, Shihao, Jia, Mengyao, Wang, Wei, Hou, Juan, Kuang, Wenjun
Format: Article
Language:English
Subjects:
304L stainless steel
Corrosion resistance
Heat treatment
Laser powder bed fusion
Surface state
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Summary:The corrosion resistance of laser powder bed fusion (LPBF) 304L stainless steel (SS) in 3.5 wt% NaCl solution was evaluated at room temperature through potentiodynamic polarization and electrochemical impedance spectroscopy tests. For electropolished samples, annealing at 1200 °C slightly enhanced the corrosion resistance due to changes in crystal orientation and inclusion composition, and reduced residual strain. In contrast, annealing at 1050 °C significantly reduced the corrosion resistance mainly due to the disappearance of dislocation cells and the remained residual dislocations. Residual stress/strain and martensitic transformation induced by sandpaper grinding can also deteriorate the corrosion resistance. Only the as-received sample shows stable passivation regardless of the surface conditions.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2024.03.025