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Influence of carbon nanotubes on microstructure and corrosion performance of additively manufactured 316L stainless steel

Journal Article · · Corrosion Science
 [1];  [2];  [3];  [3];  [1]
  1. North Carolina State University, Raleigh, NC (United States)
  2. North Carolina State University, Raleigh, NC (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  3. Naval Postgraduate School, Monterey, CA (United States)
For this study, laser powder bed fusion (LPBF) was performed on feedstock-modified 316L stainless steel powder with 1 and 2 vol% carbon nanotubes (CNT). The corrosion resistance was evaluated following cyclic potentiodynamic polarization tests conducted in 0.6 M NaCl at room temperature, 35 and 50 °C, and immersion tests in 6 % FeCl3. The CNT addition has increased the pitting potential and decreased number of pits formed during immersion in FeCl3 solution, which could be attributed to Mn-Si-O nano inclusions refinement and segregation of chromium around the inclusions. The observed corrosion behavior was correlated with the altered microstructure due to CNT addition.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2246641
Report Number(s):
PNNL-SA--185836
Journal Information:
Corrosion Science, Journal Name: Corrosion Science Vol. 224; ISSN 0010-938X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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