Influence of aluminizing and pre-oxidation on corrosion behavior of 316Ti in liquid Pb at 600–700 °C
A. Purwitasari, R. Fetzer, A. Heinzel, C. Oskay, A.Weisenburger, G. Müller
Corrosion Science 251 (2025) 112896, DOI: 10.1016/j.corsci.2025.112896
This study explores the possibility to extend the service temperature of austenitic steel 316Ti in liquid lead to 700 °C. To improve the material compatibility, 316Ti is subjected to three different pre-treatments prior to Pb exposure: pre-oxidation in hot air, aluminizing by pack cementation, and the combination of both. In exposure tests with duration up to 5000 hours, the combined pre-treatment comprising aluminizing by pack cementation and subsequent pre-oxidation is found to provide the most effective corrosion protection to austenitic steel 316Ti in contact with liquid Pb containing 2 × 10⁻⁷ wt% dissolved oxygen at both 600 and 700 °C.
Fig. 8: Untreated 316Ti after exposure in liquid Pb at 700 °C. a) BSE image after 2000 h exposure b) SE image after 5000 h exposure, c) EBSD phase mapping result and d) EDS elemental distribution mappings of b).
Fig. 4: Aluminized 316Ti after pre-oxidation. a) BSE image of the coating and substrate, b) BSE image of a homogeneous outer layer, c) EDS line scan result along green arrow in b), d) BSE image of an outer layer with markedly microstructural evolution, e) EDS line scan result along green arrow in d), f) EDS elemental distribution mapping of a).
Fig. 15: Aluminized 316Ti pre-oxidized after 5000 h exposure in liquid Pb at 700 °C. a) Cross-sectional BSE image, b) EDS elemental line scan result (see green line in Fig a), c) EDS elemental distribution mapping result of a. Detail a1) enlarged section of oxide layer and the EDS line scan results across the oxide layer.Reprinted from Corrosion Science with permission from Elsevier according to the Creative Commons license.
