Pb corrosion of ferritic/martensitic steels at 600-700 °C

A. Purwitasari, R. Fetzer, A. Heinzel, C. Oskay, A. Weisenburger, G. Müller

Corrosion Science 255 (2025), 113142, DOI: 10.1016/j.corsci.2025.113142

Purwitasari2025b_fig5

Fig. 5. P91 samples after exposures at 700 °C. a) SE image after 1000 h, b) corresponding EBSD phase mapping and c) EDS elemental mapping result, d) result of line scan through MnS precipitate, e) BSE image after 2000 h, f) BSE image after 5000 h, g) corresponding EDS elemental mapping result.

Purwitasari2025b_fig12

Fig. 12. SEM images of aluminized P91 after etching and its corresponding unetched images in higher magnification: a) initial state, i.e., after aluminizing and heat treatment procedure, b) after 5000 h exposure at 600 °C, and c) after 5000 h exposure at 700 °C.

Reprinted from Corrosion Science witrh permission from Elsevier according to the Creative Commons lincense.

This research investigates the corrosion behavior of three different ferritic/martensitic steels (P91, 1.4748, 1.4136) in liquid lead containing 2 × 10⁻⁷ wt% dissolved oxygen. Additionally, one of the steels (P91) is surface-aluminized by pack cementation prior to Pb exposure to explore the efficacy of an aluminide coating. The aim of this study is to explore the possibility to extend the use from a corrosion point of view of the selected F/M steels in liquid Pb up to 700 °C. To gain a better understanding of the corrosion behavior over time, exposure tests with three different durations up to 5000 h are performed. Post-exposure analysis demonstrates oxidation on all materials in the initial stage, followed by various differing scenarios specific for each material and exposure temperature. These range from oxidation with protective properties and selective Cr dissolution with intergranular Pb penetration to total dissolution.

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