Corrosion Science最新文献_第6页

Stress corrosion behavior of 316 stainless steel tube under dual-loop high-temperature waters 316不锈钢管在双回路高温水中的应力腐蚀行为

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.corsci.2026.113683

Tingguang Liu , Yongming Han , Zhenhua Li , Yonghao Lu , Tetsuo Shoji

Steam generator (SG) tubes in pressurized water reactors have been extensively studied; however, investigations using tubular specimens under simulated operating conditions, dual-loop environments of high-flowing high-temperature and high-pressure waters, remain scarce. In this work, a slow strain rate tensile test was conducted on a 316 stainless steel tube under such dual‑loop conditions that simulated a temperature difference of > 30 °C and a pressure difference of 7 MPa between the primary and secondary sides. The corrosion damage behavior on the inner and outer surfaces of the tube was systematically compared. The results show that oxidation was more severe on the inner surface, while cracks on the outer surface penetrated deeper, exhibiting typical intergranular stress corrosion cracking (IGSCC) characteristics. In contrast, cracks on the inner surface were shallower (average depth about one‑third of that on the outer surface) but significantly denser (2.3 times that on the outer surface). The average crack spacing (35.3 μm) was close to the average grain size excluding twins (29.3 μm), suggesting that the majority of random high-angle grain boundaries in inner surface experienced cracking. Comprehensive analysis reveals that the dominant failure mechanism on the outer surface is IGSCC, whereas intergranular corrosion is the predominant failure mechanism on the inner surface.

压水堆中的蒸汽发生器（SG）管已被广泛研究；然而，在高流量高温高压双回路环境下模拟操作条件下的管状试样研究仍然很少。本文对316不锈钢管在双回路条件下进行了慢应变速率拉伸试验，模拟了主、次侧温差为>； 30℃，压力差为7 MPa。系统地比较了钢管内外表面的腐蚀损伤行为。结果表明：内表面氧化更严重，外表面裂纹渗透更深，表现出典型的晶间应力腐蚀开裂（IGSCC）特征；相比之下，内表面的裂缝较浅（平均深度约为外表面的三分之一），但密度明显较高（是外表面的2.3倍）。除孪晶外，平均裂纹间距（35.3 μm）与平均晶粒尺寸（29.3 μm）接近，表明内表面随机高角度晶界大部分发生了裂纹。综合分析表明，外表面的主要破坏机制为晶间腐蚀，内表面的主要破坏机制为晶间腐蚀。

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引用次数: 0

Design and fabrication strategy for wear- and corrosion-resistant MAO coatings upon Mg-Li alloys via incorporation of conductive TiBCN ceramic nanoparticles 导电TiBCN陶瓷纳米颗粒在Mg-Li合金表面制备耐磨耐蚀氧化钨涂层的设计与制造策略

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.corsci.2026.113679

Bingzhi Li , Bingce Liu , Enyu Guo , Keqiang Su , Zhihao Zhou , Yibo Ouyang , Xingchen Li , Huijun Kang , Zongning Chen , Xiao-Bo Chen , Tongmin Wang

Magnesium-lithium (Mg-Li) alloys are promising lightweight materials for engineering applications, but their use is limited by poor wear and corrosion resistance. To address those challenges, micro-arc oxidation (MAO) coatings were fabricated on a model Mg-Li alloy LA81 using electrolytes containing conductive ceramic nanoparticles (TiBCN). Results suggest that TiBCN enhances electrolyte conductivity and altering arc discharge behavior, thereby reducing overall porosity of the resultant MAO coatings. Comprehensive characterization including coating thickness, microstructure, triboelectrochemical and corrosion resistance identify 2.5 g/L TiBCN as the optimal concentration. This formulation exhibits enhanced corrosion resistance, wear resistance and a notably low pore density. Three-dimensional evolution of corrosion in the optimized MAO coating was examined using synchrotron X-ray computed tomography. In corrosive environments, the combined effects of corrosion and expansion of corrosion products alter size, shape, and number of microdefects in MAO coatings over time. These changes were driven by the interactions between localized corrosion propagation and the accumulation and expansion of corrosion products. Ultimately, neighboring micro-defects merged, forming interconnected through-pores and accelerating MAO coating degradation.

镁锂（Mg-Li）合金是一种很有前途的轻型工程材料，但其使用受到较差的耐磨性和耐腐蚀性的限制。为了解决这些问题，研究人员利用含有导电陶瓷纳米颗粒（TiBCN）的电解质在Mg-Li合金LA81模型上制备了微弧氧化（MAO）涂层。结果表明，TiBCN提高了电解液的导电性，改变了电弧放电行为，从而降低了氧化锆涂层的整体孔隙率。综合表征涂层厚度、微观结构、摩擦电化学和耐蚀性，确定2.5 g/L TiBCN为最佳浓度。该配方具有增强的耐腐蚀性，耐磨性和显着的低孔隙密度。采用同步x射线计算机断层扫描技术对优化后的MAO涂层进行了三维腐蚀演化研究。在腐蚀环境中，腐蚀产物的腐蚀和膨胀的综合影响会随着时间的推移改变MAO涂层中微缺陷的大小、形状和数量。这些变化是由局部腐蚀扩展和腐蚀产物的积累和膨胀之间的相互作用驱动的。最终，邻近的微缺陷合并，形成相互连接的通孔，加速MAO涂层的降解。

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引用次数: 0

Failure mechanism of K411 superalloy under the coupling effect of corrosion and creep 腐蚀与蠕变耦合作用下K411高温合金的破坏机理

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-26 DOI: 10.1016/j.corsci.2026.113663

Ren Yu , Yao Wang , Jiasheng Dong , Yu Chang , Min Li , Lei Wang

The coupling effect of corrosion and creep on failure mechanism of K411 nickel-based superalloy under a simulated turbine blade service conditions (900 °C/165 MPa with 2 vol% SO₂) was investigated. The results show that the creep rupture time in coupling environment decreased around 73 % comparing with that of normal creep. The presence of SO₂ in the environment leads to the formation of voids, which serve as rapid diffusion pathways for nitrogen. Subsequently, nitrogen transport was enhanced by applied stress through dislocation-pipe diffusion mechanisms. This coupling effect promotes extensive formation of needle-like and cross-shaped TiN precipitates. The TiN precipitation consumes main γ'-forming elements Ti, generating γ'-free zone beneath corrosion scale measuring approximately 34 ± 3.2 μm in width (increased around 143 %). At the TiN/substrate interfaces, strain incompatibility leads to void nucleation, which was further interconnected and transformed into crack. These cracks then combined with voids initiated by sulphides, leading to surface crack formation and premature failure. The coupling effect of corrosion and creep accelerates nitrogen permeation, which constitutes the fundamental mechanism of the significant rupture time reduction.

在模拟涡轮叶片工况（900 °C/165 MPa、2 vol% SO2）下，研究了腐蚀和蠕变耦合对K411镍基高温合金失效机理的影响。结果表明，与正常蠕变相比，耦合环境下的蠕变断裂时间缩短了73% %左右。环境中SO2的存在导致孔隙的形成，这是氮的快速扩散途径。随后，外加应力通过位错-管道扩散机制增强了氮的输运。这种耦合效应促进了针状和十字形TiN析出物的广泛形成。TiN的析出消耗了主要的γ′形成元素Ti，在腐蚀层下方形成了宽度约为34 ± 3.2 μm的无γ′区（增加约143 %）。在TiN/衬底界面处，应变不相容导致空洞形核，空洞形核进一步连通并转化为裂纹。这些裂纹随后与硫化物形成的空洞结合，导致表面裂纹形成和过早失效。腐蚀和蠕变的耦合作用加速了氮的渗透，这是显著缩短断裂时间的根本机制。

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引用次数: 0

Anisotropic corrosion study of Q345 steel incorporating experiment-informed polycrystalline modelling 采用实验多晶模型的Q345钢各向异性腐蚀研究

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-21 DOI: 10.1016/j.corsci.2026.113630

Lichao Xu , Xin Ruan , Fabio Biondini , Qidi Wang

This study investigates the corrosion behaviour of Q345 steel in different directions, considering the characteristics of polycrystalline microstructures. Based on metallographic experimental results, a polycrystalline-structure dimensional upscaling modelling method (2D to 3D) is proposed to construct refined microstructural models. Building on these models, a pit-evolution prediction model is developed to reveal and quantitatively characterize the influence of microstructure on the corrosion process. The proposed polycrystalline modelling method and the baseline corrosion-prediction model are validated through comparisons with metallographic and corrosion experiments, thereby ensuring the reliability of the subsequent extended analyses. On this basis, a systematic comparative study is conducted, supported by cross-validation between numerical simulations and corrosion experiments, to evaluate the directional corrosion behaviour of Q345 steel and to quantitatively assess the anisotropic corrosion characteristics of engineering structural steel. The results indicate that polycrystalline microstructures exert a significant influence on the corrosion process of engineering steels: the corrosion rate along the direction of multilayer grain-boundary stacking is higher than that in other directions. When the corrosion mass-loss ratio reaches approximately 2 %, this directional difference corresponds to a maximum difference of 23.03 % in localized pit depth. Therefore, accurate consideration of polycrystalline microstructures is necessary for reliable corrosion prediction of steel structures. These findings not only provide a reasonable explanation for the frequently observed abnormally rapid edge corrosion in steel components of engineering structures, but also offer a robust tool for refined corrosion prediction and analysis.

考虑多晶组织的特点，研究了Q345钢在不同方向上的腐蚀行为。在金相实验结果的基础上，提出了一种多晶结构二维到三维的尺度提升建模方法，以构建精细的微观组织模型。在这些模型的基础上，建立了坑演化预测模型，以揭示和定量表征微观组织对腐蚀过程的影响。通过与金相和腐蚀实验的比较，验证了所提出的多晶建模方法和基线腐蚀预测模型，从而确保了后续扩展分析的可靠性。在此基础上，通过数值模拟与腐蚀实验的交叉验证，进行系统对比研究，评价Q345钢的定向腐蚀行为，定量评价工程结构钢的各向异性腐蚀特性。结果表明，多晶组织对工程钢的腐蚀过程有显著影响，沿多层晶界堆积方向的腐蚀速率高于其他方向。当腐蚀质量损失比约为2 %时，该方向差对应于局部坑深的最大差为23.03 %。因此，准确地考虑多晶组织对钢结构腐蚀的可靠预测是必要的。这些发现不仅为工程结构钢构件中经常观察到的异常快速边缘腐蚀提供了合理的解释，而且为精细腐蚀预测和分析提供了强有力的工具。

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引用次数: 0

Unraveling the influence of redox conditions on corrosion product deposition in Cr-coated cladding 揭示氧化还原条件对cr包覆层腐蚀产物沉积的影响

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-28 DOI: 10.1016/j.corsci.2026.113672

Tao Huang , Fujie Zhou , Shixin Gao , Huifang Yue , Kun Zhang , Junsen Fu , Yao Xiao , Zhao Shen , Hua Pang , Lefu Zhang , Kai Chen

The redox condition plays a decisive role in the high temperature corrosion resistance of Cr coatings, while its influence on corrosion product deposition remains insufficiently understood. In this study, long-term deposition tests were conducted in an internally heated recirculating loop, combined with high-resolution characterization, to investigate the corrosion product deposition behavior of Cr-coating in high-temperature water under different redox conditions. Results show that under reducing conditions, the deposits primarily consist of coarse Fe₃O₄ and NiFe₂O₄ particles. Although Cr species were barely detectable in water (<1 ppb), the Cr coating undergoes slight dissolution-redeposition, leading to the accumulation of Cr oxides that accounted for nearly 20 % of the inner deposits. In contrast, under oxidizing conditions, the Cr coating experiences severe porous dissolution, accompanied by significant dissolution-redeposition. The deposit layer is considerably thicker and is mainly composed of fine Fe₂O₃/Cr₂O₃ and NiFe₂O₄/(Ni,Fe)Cr₂O₄ core-shell structured particles, with locally dense CrOOH precipitates within the inner deposits. A thermodynamic Fe-Cr-Ni precipitation model was developed to elucidate the underlying deposition mechanisms under different redox conditions.

氧化还原条件对Cr涂层的耐高温腐蚀性起决定性作用，但对腐蚀产物沉积的影响尚不清楚。本研究通过在内加热循环回路中进行长期沉积试验，结合高分辨率表征，研究cr涂层在不同氧化还原条件下在高温水中的腐蚀产物沉积行为。结果表明：在还原条件下，沉积主要由粗粒Fe3O4和NiFe2O4组成；虽然Cr在水中几乎检测不到（<1 ppb），但Cr涂层经历了轻微的溶解-再沉积，导致Cr氧化物的积累，占内部沉积物的近20% %。相反，在氧化条件下，Cr涂层发生严重的多孔溶解，并伴有明显的溶解-再沉积。沉积层较厚，主要由细小的Fe2O3/Cr2O3和NiFe2O4/(Ni,Fe)Cr2O4核壳结构颗粒组成，内部沉积层有局部致密的CrOOH沉淀。建立了Fe-Cr-Ni沉积热力学模型，阐明了不同氧化还原条件下的沉积机制。

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引用次数: 0

Synthesis, microstructure and properties of SiC reinforced MoAlB composites prepared by fast hot-pressing sintering 快速热压烧结SiC增强MoAlB复合材料的合成、组织与性能

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-28 DOI: 10.1016/j.corsci.2026.113662

Mingkun Xiao , Yaofeng Wu , Qing Chang , Yanjiao Liu , Ce Zheng , Xiaoqiang Li , Chao Ye

SiC-reinforced MoAlB composites (5–20 wt%) were fabricated via fast hot-pressing (FHP) to enhance high-temperature performance. Phase-pure MoAlB powder was first synthesized by vacuum sintering stoichiometric Mo/Al/B (1:1.3:1 mol) at 1250 ℃ (<10⁻³ Pa). Composites were consolidated by FHP (1200 °C, 40 MPa, 10 min, vacuum), achieving near-full densification (98.3 % relative density) with chemically inert MoAlB-SiC interfaces, as confirmed by XRD/SEM-EDS. The 10 wt% SiC composite delivered optimal mechanical properties: flexural strength to 615 MPa (+35 %), hardness to 30.6 GPa (+60 %), Vickers hardness to 12.8 Gpa (+62 %) and indentation fracture toughness to 8.95 MPa·m^1/2 (+70 %) versus monolithic MoAlB. Cyclic oxidation (900–1200 °C) demonstrated SiC-induced formation of a protective dual-phase (Al₂O₃-SiO₂) scale following parabolic kinetics. This synergistic barrier suppressed cation interdiffusion, reducing oxidation rates by 42–68 % across temperatures compared to unmodified MoAlB. The results establish MoAlB-SiC composites as promising candidates for extreme-environment applications.

采用快速热压（FHP）法制备了sic增强MoAlB复合材料（5-20 wt%），以提高高温性能。采用化学计量Mo/Al/B（1:1.3:1 mol）在1250℃（<10⁻³Pa）下真空烧结法首次合成相纯MoAlB粉末。通过FHP（1200°C, 40 MPa, 10 min，真空）固结复合材料，通过XRD/SEM-EDS证实，具有化学惰性MoAlB-SiC界面的复合材料接近完全致密（相对密度为98.3% %）。与单片MoAlB相比，10 wt% SiC复合材料具有最佳的力学性能：抗弯强度为615 MPa(+35 %)，硬度为30.6 GPa(+60 %)，维氏硬度为12.8 GPa(+62 %)，压入断裂韧性为8.95 MPa·m2 /2（+70 %）。循环氧化（900-1200°C）证明了sic诱导的保护性双相（Al₂O₃-SiO₂）垢的形成遵循抛物线动力学。与未经改性的MoAlB相比，这种协同屏障抑制了阳离子的相互扩散，在不同温度下将氧化速率降低了42-68 %。结果表明MoAlB-SiC复合材料是极端环境应用的有希望的候选者。

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引用次数: 0

Regression analysis of metal dusting of Ni-based multicomponent dilute alloys: Impact of Cu and Fe ni基多组分稀合金金属粉尘的回归分析：Cu和Fe的影响

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-01 Epub Date: 2026-01-02 DOI: 10.1016/j.corsci.2026.113593

C. Schlereth , E. White , G. Chai , M. Lundberg , M.C. Galetz

Ni-based multicomponent dilute alloys with 20 – 31 wt% Cr and mixed minor additions of Al, Si, Mn, Ti, Fe, Ta, Co, Nb, Cu, W, Mo, and C were tested to determine their metal dusting resistance. Samples were exposed in a 47 CO, 47 H₂, 4 CO₂ and 2 H₂O atmosphere at 620 °C and 18 bar for up to 2970 h. An estimation of the pit area growth rate was used to categorize the metal dusting resistance of the alloys. Using these categories, a simple and a multiple linear regression analysis were performed to study the impact of each element. Within the studied alloys, Cu contents up to around 5 wt% were found to have a strong positive influence. Negative effects were seen for Fe additions of around 10–15 wt%. Statistically significant improvements in metal dusting resistance were also found for Mn and Ta additions. Some of the tested alloys showed an unusually shallow pit growth, which is promising for long-term applications in harsh metal dusting conditions.

采用20 ~ 31 wt% Cr和少量Al、Si、Mn、Ti、Fe、Ta、Co、Nb、Cu、W、Mo和C混合添加的ni基多组分稀合金进行了抗粉尘性能测试。样品在620°C和18 bar的47 CO， 47 H2, 4 CO2和2 H2O气氛中暴露至2970 h。利用坑面积增长速率对合金的抗粉尘性能进行了分类。利用这些类别，进行了简单和多元线性回归分析，以研究每个元素的影响。在所研究的合金中，高达5 wt%左右的Cu含量被发现具有强烈的积极影响。铁添加量约为10-15 wt%时产生负面影响。Mn和Ta的添加也显著改善了金属抗粉尘性能。一些被测试的合金显示出异常浅的坑生长，这有望在恶劣的金属粉尘条件下长期应用。

引用次数: 0

Unexpected low temperature crack propagation in nuclear post-shutdown water chemistry of Alloy 52 with potential effects of hydrogen 氢的潜在影响下52合金核后停堆水化学中的意外低温裂纹扩展

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-01 Epub Date: 2026-01-06 DOI: 10.1016/j.corsci.2026.113604

Pedro A. Ferreirós , Ulla Ehrnstén , Yanling Ge , Björn Forssgren , Mimmi Bäck , Song Lu , Pål Efsing , Zaiqing Que

Constant-displacement bolt-loaded compact tension specimens of Nickel-based Alloy 52 were exposed to boiling water reactor environment for 12 years, followed by an additional 3 years in post-shutdown cold water conditions in a Swedish nuclear power plant test loop, under a stress intensity factor of 20 MPa√m. After outer surface decontamination and specimen opening, unexpected crack extensions of 3–4.5 mm were observed. The fracture surface and the cross-sectional deformation microstructure were examined by electron microscopies techniques down to the nanoscale. The oxide layer in the region exhibiting unexpected crack growth was notably thin, suggesting that it formed after exposure to elevated operating temperatures. The dominant fracture mode is transgranular, propagating along close-packed {111} planes. The grains contained heterogeneous microstructures with regions enriched in nanometer-sized Ti(N,C) and the zigzag crack paths did not traverse these regions strengthened areas. Extensive shear bands were present near the crack tips, indicating pronounced localized plasticity. Hydrogen reduces stacking fault energy, results in localized plasticity and enhances shear bands formation. Low temperature crack propagation with evident effects of hydrogen was considered as the potential cause of crack propagation in Alloy 52 in the absence of external dynamic loading under post-shutdown cold water chemistry.

镍基合金52的恒位移螺栓加载紧绷试样在沸水反应堆环境中暴露了12年，然后在瑞典核电站试验回路中在关闭后的冷水条件下额外暴露了3年，应力强度系数为20 MPa√m。经外表面净化和试样打开后，观察到3-4.5 mm的意外裂纹扩展。采用纳米级的电子显微镜技术对断口表面和截面变形组织进行了观察。在出现意外裂纹扩展的区域的氧化层非常薄，表明它是在暴露于较高的工作温度后形成的。主要的断裂模式是穿晶断裂，沿致密的{111}面扩展。晶粒具有非均匀的显微结构，富含纳米级Ti（N，C）的区域，锯齿形裂纹路径不会穿过这些强化区域。裂纹尖端附近存在广泛的剪切带，表明明显的局部塑性。氢降低了层错能，产生了局部塑性，促进了剪切带的形成。在停堆后冷水化学作用下，在没有外部动载荷的情况下，氢的低温裂纹扩展是52合金裂纹扩展的潜在原因。

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引用次数: 0

Hydrogen embrittlement in low-Ni austenitic stainless steel: Microstructure-driven mechanisms revealed by experimental and simulation study 低镍奥氏体不锈钢的氢脆：微观组织驱动机制的实验和模拟研究

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-01 Epub Date: 2026-01-05 DOI: 10.1016/j.corsci.2026.113598

Yeonggeun Cho , Hyung-Jun Cho , Jinheung Park , Sung-Joon Kim

The present study investigated the microstructure-driven mechanisms governing hydrogen embrittlement (HE) in low-Ni austenitic stainless steels, by integrating multi-scale experimental analysis with crystal plasticity and hydrogen transport simulations. The results revealed that while α’ martensite increases susceptibility to HE, grain-size heterogeneity and intragranular nanoscale carbides play critical roles in local H distribution and H-induced cracking. Grain refinement enhanced strength and decreased H uptake; however, simulations demonstrated that inevitable grain-size deviations induced stress heterogeneity between fine and coarse grains. H segregation along high-angle grain boundaries, coupled with stress heterogeneity, promoted localized H-induced cracking in highly deformed regions to deteriorate HE resistance. Increased carbon content for strengthening facilitated the precipitation of nanoscale Cr₂₃C₆ carbides within austenite grains, but these carbides increased the uptake of diffusible H. Their interfaces acted as preferential crack initiation sites in central regions, and the cracks propagated toward the surface during deformation. Surface H-induced cracks generated additional stress concentrations in the interior, which synergized negatively with central cracking to accelerate premature fracture of the steel.

本研究采用多尺度实验分析、晶体塑性和氢输运模拟相结合的方法，研究了低镍奥氏体不锈钢氢脆（HE）的微观组织驱动机制。结果表明，在α′马氏体增加HE敏感性的同时，晶粒尺寸不均一性和粒内纳米碳化物对H的局部分布和H致开裂起关键作用。晶粒细化提高了强度，降低了吸氢量；然而，模拟表明，不可避免的晶粒尺寸偏差导致了细晶粒和粗晶粒之间的应力不均匀性。沿高角度晶界的H偏析，加上应力不均匀性，促进了高变形区域的局部H致开裂，从而降低了HE抗力。碳含量的增加促进了奥氏体晶粒内纳米级Cr23C6碳化物的析出，但这些碳化物增加了扩散h的吸收，它们的界面在中心区域成为首选的裂纹萌生点，并且在变形过程中裂纹向表面扩展。表面h裂纹在内部产生额外的应力集中，与中心裂纹负协同作用，加速钢的过早断裂。

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引用次数: 0

Insight into the corrosion mechanism of pre-stressed 9Cr RAFM steel with long-term thermal aging exposed to oxygen saturated LBE at 550 ℃ 550℃饱和氧LBE下长期热时效的预应力9Cr RAFM钢腐蚀机理研究

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2026-04-01 Epub Date: 2026-01-15 DOI: 10.1016/j.corsci.2026.113619

Chao Hai , Tingjun Huang , Huaiyun Cui , Qunying Huang , Yutao Zhai

In fast neutron reactors, the degradation of microstructures and buildup of stress in structural materials significantly affect their performance and structural integrity under high temperatures and corrosive coolant environments. This study examines the microstructural evolution of 9Cr reduced activation ferritic-martensitic (RAFM) steel after thermal aging at 550℃ for 2000 h, and its subsequent influence on oxidation corrosion under stress in an oxygen-saturated lead-bismuth eutectic (LBE) environment. The resulting oxide layer was found to comprise Fe₃O₄, Fe-Cr spinel and an inner oxidation zone (IOZ). During the thermal aging, coarsening of M₂₃C₆ carbides reduced the passivation capability of the steel and accelerated the initial stage of LBE corrosion. Moreover, those coarsened M₂₃C₆ precipitates preferentially oxidized to form oxides Cr₂O₃, which increased the thickness of IOZ layer. The stress was observed to markedly enhance the corrosion rate, an effect that was further amplified by long-term thermal aging. The underlying mechanisms were discussed with the framework of the available space model.

在快中子反应堆中，在高温和腐蚀性冷却剂环境下，结构材料中微结构的退化和应力的积累会严重影响其性能和结构的完整性。本文研究了9Cr还原活化铁素体-马氏体（RAFM）钢在550℃2000 h热时效后的显微组织演变，以及随后在氧饱和铅铋共晶（LBE）环境下应力氧化腐蚀的影响。氧化层由Fe3O4、Fe-Cr尖晶石和内氧化区组成。在热时效过程中，M23C6碳化物的粗化降低了钢的钝化能力，加速了LBE腐蚀的初始阶段。粗化的M23C6析出物优先氧化形成Cr2O3氧化物，增加了IOZ层的厚度。观察到应力显著提高了腐蚀速率，长期热老化进一步放大了这一效应。在可用空间模型的框架下，讨论了其基本机制。

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引用次数: 0