Oxygen-driven de-alloying of Fe-14Cr-12Ni-10Mn-3Cu-2.5Al-1Nb austenitic steel at 500 °C in static Pb-Bi eutectic with concentration of dissolved oxygen alternating from ∼10-6 to 10-9 mass% for 10000 h

Corrosion Communications Pub Date : 2024-11-12 DOI:10.1016/j.corcom.2024.01.002

Valentyn Tsisar , Erich Stergar , Serguei Gavrilov , Eloa Lopes Maia , Wouter Van Renterghem , Pierre Louette , Stéphane Lucas

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Abstract

A high-Mn austenitic steel Fe-14Cr-12Ni-10Mn-3Cu-2.5Al-1Nb was tested at 500 °C in static Pb-Bi eutectic for 10000 h. In the course of the test, oxygen concentration in liquid metal was cycled from ∼10^-6 to ∼10^-9 mass%, which provides oxidation and dissolution regimes, respectively. After 10000 h exposure steel showed formation of ferrite corrosion zone depleted in Mn, Ni, Cu, Cr, Fe and penetrated by Pb and Bi. Average depth of corrosion is 15±5 µm, while maximum corrosion depth locally reaches ∼35 µm. Dissolved Mn and Cr re-precipitated in the vicinity of steel surface in a form of stratified Mn-O/Cr-Mn-O oxide scale. Obtained results were compared to those of similar Al-alloyed austenitic steels with lower Mn content, which exhibited protective oxidation under same test conditions. The phenomenological mechanism of oxygen-driven de-alloying of steel in Pb-Bi[O] is discussed.

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在 500 ℃ 的静态铅铋共晶中，溶解氧浓度从 ∼10-6 到 10-9 质量%交替变化，10000 小时内，Fe-14Cr-12Ni-10Mn-3Cu-2.5Al-1Nb 奥氏体钢的氧驱动脱合金过程

一种高锰奥氏体钢 Fe-14Cr-12Ni-10Mn-3Cu-2.5Al-1Nb 在 500 °C 的静态 Pb-Bi 共晶中进行了 10000 小时的试验。试验过程中，液态金属中的氧浓度从 ∼10-6 质量%到 ∼10-9 质量%不等，分别提供了氧化和溶解状态。暴露 10000 小时后，钢中形成了铁素体腐蚀区，锰、镍、铜、铬、铁含量减少，铅和铋渗透其中。平均腐蚀深度为 15±5 µm，局部最大腐蚀深度达到 ∼35 µm。溶解的锰和铬在钢表面附近以 Mn-O/Cr-Mn-O 氧化层的形式重新沉淀。获得的结果与锰含量较低的类似铝合金奥氏体钢的结果进行了比较，后者在相同的测试条件下表现出保护性氧化。讨论了 Pb-Bi[O]中钢的氧驱动脱合金现象机理。

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