High-Temperature Corrosion Behavior of Fe-18Ni-12Cr-2.9Al and Fe-18Ni-12Cr-2.3Al-Nb-C Austenitic Steels Depending on Dissolved Oxygen Concentration in Static Liquid Pb at 700 °C

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-03-07 DOI:10.1007/s11085-024-10233-2

Valentyn Tsisar, Zhangjian Zhou, Olaf Wedemeyer, Aleksandr Skrypnik, Jürgen Konys, Carsten Schroer

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Abstract

The corrosion behavior of the aluminum-alloyed austenitic steels Fe-18Ni-12Cr-2.9Al and Fe-18Ni-12Cr-2.3Al-Nb-C was investigated at 700 °C in static Pb for 1000 h as a function of the concentration of dissolved oxygen in the liquid metal. In Pb with ~ 5 × 10^–9 mass % dissolved oxygen, both steels showed dissolution. Depth of corrosion averaged 67 (± 18) µm and 78 (± 25) µm for Fe-18Ni-12Cr-2.3Al-Nb-C and Fe-18Ni-12Cr-2.9Al, respectively. In Pb with higher oxidation potential of 2 × 10^–6 mass %O, both steels showed protective and accelerated oxidation. The protective thin oxide film (≤ 1 µm) was composed of outermost Fe-rich, intermediate Cr-rich and inner Al-rich sublayers. The thicker oxide scale was of irregular thickness (2 ÷ 30 µm) and consisted of Fe–Cr mixed oxide with Ni-rich metallic inclusions.

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700 °C 时静态液态铅中的溶解氧浓度对 Fe-18Ni-12Cr-2.9Al 和 Fe-18Ni-12Cr-2.3Al-Nb-C 奥氏体钢高温腐蚀性能的影响

研究了铝合金奥氏体钢 Fe-18Ni-12Cr-2.9Al 和 Fe-18Ni-12Cr-2.3Al-Nb-C 在 700 °C 静态 Pb 中 1000 小时的腐蚀行为与液态金属中溶解氧浓度的函数关系。在溶解氧质量百分比为 ~ 5 × 10-9 的铅中，两种钢都出现了溶解现象。Fe-18Ni-12Cr-2.3Al-Nb-C 和 Fe-18Ni-12Cr-2.9Al 的平均腐蚀深度分别为 67 (± 18) µm 和 78 (± 25) µm。在氧化电位为 2 × 10-6 质量 %O 的较高铅中，两种钢都出现了保护性加速氧化。保护性氧化薄膜（≤ 1 µm）由最外层的富铁、中间层的富铬和内层的富铝亚层组成。较厚的氧化膜厚度不规则（2 ÷ 30 µm），由铁铬混合氧化物和富含镍的金属夹杂物组成。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

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