含V、W高Mn奥氏体耐热钢在熔融Na2SO4中热腐蚀行为

doi:10.11902/1005.4537.2025.143

中国腐蚀与防护学报 DOI: 10.11902/1005.4537.2025.143

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含V、W高Mn奥氏体耐热钢在熔融Na2SO4中热腐蚀行为

王乙初¹,刘天龙²,张思倩¹,赵利²,骆智超²,郑开宏²

1. 沈阳工业大学
2. 广东省科学院新材料研究所

Hot Corrosion Behavior of High-Mn Austenitic Heat-Resistant Steel Containing V and W beneath Molten Sodium Sulfate

引用本文:

王乙初刘天龙张思倩赵利骆智超郑开宏. 含V、W高Mn奥氏体耐热钢在熔融Na2SO4中热腐蚀行为[J]. 中国腐蚀与防护学报, 10.11902/1005.4537.2025.143.

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摘要: 以一种含V、W高Mn奥氏体耐热钢及其基础合金为对象，研究了其在900℃熔融Na2SO4中的热腐蚀行为。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、电子背散射衍射仪(EBSD)和能谱仪(EDS)等手段对合金微观组织、腐蚀产物和腐蚀层结构进行了分析。结果显示，含V、W高Mn奥氏体耐热钢较基础合金具有更优异的抗熔融Na2SO4热腐蚀性能。两种实验钢的腐蚀动力学曲线均呈现出双抛物线关系，即随着腐蚀时间的延长，两种实验钢均出现了加速腐蚀现象。但含V、W高Mn奥氏体耐热钢较基础合金具有更长的加速腐蚀孕育期。基础合金的加速腐蚀行为主要受到内氧化和内部硫化的影响。含V、W高Mn奥氏体耐热钢中形成的(Cr, V)2O3内氧化膜在腐蚀初期对合金基体起到保护作用，提升了含V、W高Mn奥氏体耐热钢的抗熔融盐腐蚀性能。但(Cr, V)2O3转变为(Cr, Fe)VO4后可与渗入到内层的熔融盐反应形成偏钒酸盐/钒酸盐，造成了含V、W高Mn奥氏体耐热钢加速腐蚀的发生。

关键词 ：高Mn奥氏体耐热钢, 熔融Na2SO4, 钒元素, 热腐蚀行为, 热腐蚀机理

Abstract：This study focused on a high-manganese austenitic heat-resistant steel containing V and W, as well as its base alloy, and investigated their hot corrosion behavior in molten Na2SO4 at 900℃. The microstructure, corrosion products, and corrosion scale structure of the alloys were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and energy dispersive spectrometer (EDS). The results showed that the high-manganese austenitic heat-resistant steel containing V and W exhibited excellent resistance to hot corrosion by molten Na2SO4 compared to the base alloy. The corrosion kinetics curves of both experimental steels presented a double parabolic relationship, indicating that with the extension of corrosion time, both experimental steels exhibited accelerated corrosion phenomena. However, the high-manganese austenitic heat-resistant steel containing V and W had a longer incubation period for accelerated corrosion compared to the base alloy. The accelerated corrosion behavior of the base alloy was mainly influenced by internal oxidation and internal sulfidation. The (Cr, V)2O3 inner oxide layer formed in the high-manganese austenitic heat-resistant steel containing V and W protected the matrix in the early stage of corrosion, enhancing the corrosion resistance of the high-manganese austenitic heat-resistant steel to molten salts. However, when (Cr, V)2O3 transformed into (Cr, Fe)VO4, it could react with the molten salt that infiltrated into the inner layer to form metavanadate/vanadate, causing the accelerated corrosion of the high-manganese austenitic heat-resistant steel containing V and W.

Key words： High-Mn austenitic heat-resistant steel Molten Na2SO4 Vanadium Hot corrosion behavior Hot corrosion mechanism

收稿日期: 2025-05-10

ZTFLH:

TG172.6+2

基金资助:广东省基础与应用基础研究基金项目;广东省基础与应用基础研究基金项目;广东省学科类重点实验室评估专项;广东省科技计划项目;清远市科技计划项目

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https://www.jcscp.org/CN/Y0/V/I/0

[1]	王希靖, 王博士, 杨超, 杨艳, 沈斌. 纯Ni母材及焊缝在熔融Na₂SO₄-K₂SO₄中热腐蚀研究[J]. 中国腐蚀与防护学报, 2018, 38(5): 495-501.

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