Late News Poster Session: Corrosion
Program Organizers: TMS Administration
Monday 5:30 PM
March 20, 2023
Room: Exhibit Hall G
Location: SDCC
Cancelled
B-2: Comparative Corrosion Evaluation of Additively Manufactured and Commercial Aluminum Alloys for Automotive Applications: Evangelia Kiosidou1; Jiheon Jun1; Alex Plotkowski1; Amit Shyam1; Sumit Bahl1; Ryan Dehoff1; James A. Haynes1; 1Oak Ridge National Laboratory
The goal of the present study is to provide a semi-quantitative corrosion resistance ranking among commercial cast (A356+0.6Cu) and laser powder bed printed commercial (Al-10Si-Mg) and developmental (Al-Ce-Ni-Mn and Al-Ce-Ni-Mn-Zr) aluminum alloys. In addition, some wrought alloys (1100, 2024, 7055) were examined to set a performance baseline. All selected alloys are in use or being considered for automotive applications. Corrosion measurements were based on electrochemical impedance spectroscopy (EIS) and anodic potentiodynamic polarization techniques in 0.6 M NaCl solution open-to-air at room temperature. EIS was performed as one-time measurement for all materials and for the ones with the highest corrosion resistance it was repeated at 1-day intervals during a 1-week immersion experiment, in order to capture the gradual degradation of their inherent barrier properties. X-ray diffraction analysis and scanning electron microscopy/energy dispersive spectroscopy were also conducted.This work was supported by U.S. DOE EERE Vehicle Technologies Office, Powertrain Materials Core Program.
B-3: The Effects of Atmospheric Corrosion on Additively Manufactured Stainless Steel: Kasandra Escarcega Herrera1; 1Sandia National Laboratories
Laser beam powder bed fusion (LB-PBF) is a modern manufacturing technique for complicated metal components. It can produce parts with complex organic designs but often results in tortuous as-printed surfaces and heterogeneous microstructures which result in unexpected corrosion susceptibility. This study will investigate the susceptibility of LB-PBF stainless steel samples to atmospheric environments, like those in marine applications. While stainless steels exhibit good general corrosion resistance, in chloride containing environments, they are susceptible to localized corrosion and pitting. The localized corrosion susceptibility of LB-PBF 316L stainless steel exposed to an artificial seawater atmospheric corrosion environment (40% relative humidity at 35oC) with a fixed contaminant level will be assessed. Different surface preparation techniques will be explored, including: as-printed, electropolished, and chemically cleaned conditions. Post-exposure corrosion damage will be quantified with electron microscopy and optical profilometry. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. SAND2022-8724 A