Effect of Mn on the Growth Behavior of Pre-oxidized Film on the Heat-resistant Steel Surface

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

Oxidation of Metals Pub Date : 2024-04-06 DOI:10.1007/s11085-024-10242-1

Xinyu Cao, Yangpeng Zhang, Lijian Rong, Desheng Yan

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Abstract

The phase composition of the pre-oxidized film on an alloy surface usually has a great influence on its corrosion resistance. In this work, the surface oxide film growth behavior in low-oxygen atmosphere at 720 °C of two 12Cr heat-resistant steels with different Mn content was studied, and their corrosion resistance in liquid lead–bismuth eutectic (LBE) with saturated oxygen at 600 °C was tested. The results indicated that the pre-oxidized film of 1.6Mn steel is mainly composed of large-size Mn–Cr spinel and Fe–Cr spinel, while that of improved 0Mn steel is mainly composed of continuous and dense Cr₂O₃ and Fe–Cr spinel. This is because Mn has a high diffusion rate in Cr₂O₃, so it can pass through the Cr₂O₃ layer and combine with O to form Mn-rich oxides, and then the Mn-rich oxides react with Cr₂O₃ to form Mn–Cr spinel. However, due to the high solubility of Mn in LBE, the Mn-rich pre-oxidized film of 1.6Mn steel will dissolve and fail quickly, so its long-term corrosion resistance in LBE is lower than that of 0Mn steel.

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锰对耐热钢表面预氧化膜生长行为的影响

摘要合金表面预氧化膜的相组成通常对其耐腐蚀性有很大影响。本文研究了两种不同锰含量的 12Cr 耐热钢在 720 ℃ 低氧气氛中的表面氧化膜生长行为，并测试了它们在 600 ℃ 饱和氧气的液态铅铋共晶（LBE）中的耐腐蚀性。结果表明，1.6Mn 钢的预氧化膜主要由大尺寸的 Mn-Cr 尖晶石和 Fe-Cr 尖晶石组成，而改进后的 0Mn 钢的预氧化膜主要由连续致密的 Cr2O3 和 Fe-Cr 尖晶石组成。这是因为锰在 Cr2O3 中的扩散率很高，因此可以穿过 Cr2O3 层并与 O 结合形成富锰氧化物，然后富锰氧化物与 Cr2O3 反应形成 Mn-Cr 尖晶石。然而，由于 Mn 在 LBE 中的高溶解度，1.6Mn 钢的富 Mn 预氧化膜会很快溶解并失效，因此其在 LBE 中的长期耐腐蚀性低于 0Mn 钢。

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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

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.