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Critical pitting temperature of selective laser melted 316L stainless steel: A mechanistic approach

Journal Article · · Corrosion Science
 [1];  [1];  [2];  [3];  [1]
  1. Univ. of British Columbia, Vancouver, BC (Canada)
  2. Univ. of British Columbia, Vancouver, BC (Canada); Univ. of Nantes (France)
  3. Univ. of British Columbia, Vancouver, BC (Canada); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

In this work, the critical pitting temperature (CPT) of selective laser melted (SLM) 316 L stainless steel in 1.0 M NaCl was measured and compared with a commercial wrought alloy. Potentiostatic measurements determined a mean CPT value of 16 ± 0.7 °C, 27.5 ± 0.8 °C and 31 ± 1 °C for the wrought alloy, the SLM alloy normal to the build direction and parallel to the build direction, respectively. The lead-in pencil electrode technique was used to study the pit chemistry of the two alloys and to explain the higher CPT values observed for the SLM alloy. A lower critical current density required for passivation in a simulated pit solution was measured for the SLM alloy. Moreover, the ratio of the critical concentration to saturated concentration of dissolving metal cations was found to be higher for the SLM alloy, which was related to its different salt film properties, possibly as a result of the SLM’s distinct microstructure.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1769918
Alternate ID(s):
OSTI ID: 1828406
Report Number(s):
SAND--2021-2106J; 694000
Journal Information:
Corrosion Science, Journal Name: Corrosion Science Vol. 185; ISSN 0010-938X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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