Corrosion Science最新文献_第5页

The mechanism of microbiologically induced stress corrosion cracking of X80 steel under different Desulfovibrio vulgaris biofilm distributions 不同寻常脱硫弧菌生物膜分布下X80钢微生物诱发应力腐蚀开裂机理研究

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

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-15 DOI: 10.1016/j.corsci.2026.113633

Zhong Li , Yuzhou Chen , Xiaolong Li , Xiaohu Zhang , Zhiyong Liu , Hongchi ma , Jiaxing Cai , Yi Fan , Daiwei Guo , Zehua Li , Xiaogang Li , Jike Yang

This study investigates the impact of sulfate-reducing bacteria (SRB) biofilm distribution on the stress corrosion cracking (SCC) behavior of X80 steel in an anaerobic environment. U-bend X80 specimens, with stress distributions calculated through Finite Element Modeling (FEM) simulation, were immersed in culture media with varying biofilm distributions. The weight-loss tests, electrochemical tests, and analyses of biogenic H₂S and H₂ gases, as well as SCC crack morphology, were used to investigate the MISCC behavior of different biofilm distributions. The results show that a smaller biofilm distribution causes more severe microbiologically induced corrosion (MIC) because of a higher SRB cell count, following the extracellular electron transfer MIC (EET-MIC) mechanism, which leads to increased weight loss and blunter SCC cracks. Conversely, a larger biofilm distribution results in less weight loss and sharper SCC cracks over the 14 days. Higher levels of biogenic H₂S and H₂ were associated with more active microbiologically induced stress corrosion cracking (MISCC), resulting in deeper, more pronounced cracks in environments with more extensive biofilm distribution. The study suggests that a combined mechanism involving bio-electrochemical activity and biogenic hydrogen sulfide production drives the SCC process. This research provides insights into the biofilm-dependent MISCC interaction, offering guidance for selecting pipeline materials and developing mitigation strategies in environments where SRB activity is present.

研究了厌氧环境下硫酸盐还原菌（SRB）生物膜分布对X80钢应力腐蚀开裂（SCC）行为的影响。将u型X80试样浸泡在不同生物膜分布的培养基中，通过有限元模拟计算应力分布。通过失重试验、电化学试验、生物源H₂S和H₂气体分析以及SCC裂纹形貌，研究了不同生物膜分布的MISCC行为。结果表明，较小的生物膜分布会导致更严重的微生物诱导腐蚀（MIC），因为SRB细胞数量较高，遵循细胞外电子转移MIC （EET-MIC）机制，导致重量损失增加，SCC裂纹变钝。相反，在14天内，较大的生物膜分布导致体重减轻较少，SCC裂缝更明显。较高的生物源H₂S和H₂水平与更活跃的微生物诱导应力腐蚀开裂（MISCC）相关，导致在生物膜分布更广泛的环境中产生更深、更明显的裂缝。该研究表明，生物电化学活性和生物源硫化氢生产的综合机制驱动了SCC过程。这项研究提供了对生物膜依赖性MISCC相互作用的见解，为在SRB活动存在的环境中选择管道材料和制定缓解策略提供了指导。

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引用次数: 0

Revealing the enhanced corrosion resistance of Cr/FeCrAl-coated Zr alloy in simulated PWR water 揭示了Cr/ fecral涂层Zr合金在模拟压水堆水中增强的耐蚀性

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

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-20 DOI: 10.1016/j.corsci.2026.113644

Xiaoling Yang , Kun Zhang , Baifeng Luan , Jiyuan Cui , Lijun Chen , Haibo Ruan , Weijiu Huang , Kazuhiro Ogawa

The long-term corrosion behavior and oxide evolution of Cr/FeCrAl-coated Zr-4 alloy in simulated PWR primary water (360 °C and 18.6 MPa) were systematically investigated. Results showed that a continuous triplex oxide film, featuring FeCr₂O₄ spinel, Fe₃O₄ spinel and (Cr,Al)₂O₃, was developed on the coating, effectively protecting Zr substrate from corrosion. In the early stage, sustained outward Fe/Cr diffusion precipitated on the surface to form the outer spinel layer, while the internal (Cr,Al)₂O₃ layer grew inwards through oxidant transport. Over time, the diffusion barrier effect of dense (Cr,Al)₂O₃ layer shifted spinel growth mechanism to dissolution-reprecipitation, accompanied by a decelerated oxide growth. The superior corrosion resistance was dominated by the (Cr,Al)₂O₃ layer. During exposure, the FeCrAl-Cr interface and the developed near-equiaxed Cr nanograins arrested the vertical cracks along GBs and promoted blunting/deflection, mitigating coating spallation and preserving structural integrity.

系统研究了Cr/ fecral涂层Zr-4合金在模拟压水堆一次水中（360°C, 18.6 MPa）的长期腐蚀行为和氧化物演化。结果表明：涂层上形成了一层由FeCr2O4尖晶石、Fe3O4尖晶石和（Cr,Al）2O3组成的连续三元氧化膜，有效地保护了Zr基体免受腐蚀；初期，Fe/Cr持续向外扩散，形成尖晶石外层，而内部的（Cr,Al）2O3层则通过氧化剂的运输向内生长。随着时间的推移，致密（Cr,Al）2O3层的扩散阻挡效应使尖晶石的生长机制转变为溶解-再沉淀，并伴有氧化物生长减速。（Cr,Al）2O3层具有较好的耐蚀性。在暴露过程中，fecr - al -Cr界面和形成的近等轴Cr纳米颗粒阻止了沿gb的垂直裂纹，促进了钝化/偏转，减轻了涂层的剥落，保持了结构的完整性。

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引用次数: 0

Influence of Ni on the cathodic reaction of corrosion products formed on low alloy steel under wet-dry cycling Ni对低合金钢干湿循环腐蚀产物阴极反应的影响

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

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-24 DOI: 10.1016/j.corsci.2026.113648

Shan Jiang , Jian-ping Cao , Zhi-yong Liu , Ning Cai , Xue-tao Li

The reduction behavior of corrosion products formed on low alloy steels and oxygen reduction behavior are investigated in this study using ex- and in-situ electrochemical-phase analysis methods. The role of Ni in the cathodic reaction is also elucidated. The reduction of the corrosion products and oxygen is inhibited by the enrichment of Ni in the rust layer formed on Ni-containing steels. The reduction of amorphous substance and maghemite is not inhibited by the enrichment of Ni in the rust layer, while the oxidation behavior of the corrosion products is inhibited, leading to a reduction in the amount of reducible corrosion products. Therefore, the reduction of corrosion products formed on the Ni-containing steels is inhibited by decreasing the amount of reducible corrosion products. The effect of Ni on the reduction of corrosion products is therefore an indirect inhibitory process.

采用原位和原位电化学相分析方法研究了低合金钢腐蚀产物的还原行为和氧还原行为。同时阐明了Ni在阴极反应中的作用。在含镍钢上形成的锈层中富集镍，抑制了腐蚀产物和氧的还原。在锈层中富集Ni不抑制非晶态物质和磁铁矿的还原，而抑制腐蚀产物的氧化行为，导致可还原腐蚀产物的数量减少。因此，减少可还原性腐蚀产物的数量会抑制含镍钢上形成的腐蚀产物的还原。因此，镍对腐蚀产物还原的影响是一个间接抑制过程。

引用次数: 0

RE-mediated dynamic film reconstruction for concurrent corrosion and stress corrosion cracking resistance re介导的动态膜重构的耐腐蚀和应力腐蚀开裂性能

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

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-23 DOI: 10.1016/j.corsci.2026.113652

Jiawei He , Dawei Wang , Dan Qi , Linyang Zhang , Wei Cheng , Qifei Peng , Pinliang Jiang , Boyang Liu , Peng Chen , Cheng Wang , Min Zha

Formation kinetics of corrosion product film in Mg-Y-Al alloys is deliberately controlled via Y addition. An optimized Y content (3.5 wt%) promotes rapid Mg(OH)₂ nucleation via Y(OH)₃-assisted heterogeneous nucleation yet restrains its growth rate, forming a dense and protective film. This rapid generation is paramount during SCC, enabling swift film repair after rupture to hinder Cl⁻/H ingress, thereby mitigating the corrosion-hydrogen-stress synergy. This leads to a low corrosion rate (∼0.1 mm y⁻¹) and reduced SCC susceptibility (near zero strength loss and ∼10 % ductility loss). This work demonstrates that regulating film formation kinetics critically enhances corrosion and SCC resistance.

通过添加Y来控制Mg-Y-Al合金腐蚀产物膜的形成动力学。优化后的Y含量（3.5 wt%）通过Y(OH)3辅助的非均相成核促进了Mg(OH)2的快速成核，但抑制了其生长速度，形成致密的保护膜。在SCC过程中，这种快速生成是最重要的，可以在破裂后迅速修复膜，阻止Cl - H的进入，从而减轻腐蚀-氢应力的协同作用。这导致低腐蚀速率（~ 0.1 mm y⁻¹）和降低SCC敏感性（接近零强度损失和~ 10 %延性损失）。这项工作表明，调节成膜动力学可以提高腐蚀和抗SCC能力。

引用次数: 0

A cost-effective Pt-Ta multilayer coating strategy for highly durable bipolar plates in PEMWE 一种具有成本效益的高耐用双极板Pt-Ta多层涂层策略

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

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-28 DOI: 10.1016/j.corsci.2026.113675

Xiaozhi Xu , Xinyi Liu , Yingran Zhu , Xu Luo , Yutong Zhao , Shucheng Sun , Kai Sun , Xiaodong Hao , Zhigang Shao

Although the proton exchange membrane water electrolyzer (PEMWE) is considered one of the most promising technologies for green hydrogen production, the high cost of precious-metal coatings and the insufficient durability of non-precious alternatives in bipolar plates (BPs) continue to restrict large-scale commercialization. To balance cost and durability, a Pt/TaPt/Ta composite coating was fabricated on Ti substrates using magnetron sputtering (MS). The Pt loading was reduced to only 0.012 mg cm^–2. A 3–5 nm Pt top layer effectively suppressed interfacial Schottky barrier formation, while a 10–15 nm PtTa mixed layer facilitated electron transport through the oxide, ensuring excellent electrical conductivity. At the same time, the underlying Ta corrosion-resistant layer provided reliable protection for the Ti substrate. After 48 h of durability testing at 2 V vs. SCE, the interfacial contact resistance (ICR) remained as low as 2.14 mΩ cm² at 1.4 MPa, and Ti ion dissolution was reduced to 0.23 ppb (1.7 % of bare Ti). These results demonstrate that the Pt/TaPt/Ta multilayer coating provides a feasible pathway for cost-effective and durable BPs in PEMWE.

尽管质子交换膜水电解槽（PEMWE）被认为是最有前途的绿色制氢技术之一，但贵金属涂层的高成本和双极板（bp）中非贵金属替代品的耐久性不足继续限制大规模商业化。为了平衡成本和耐用性，采用磁控溅射技术在Ti衬底上制备了Pt/ tpt /Ta复合涂层。Pt加载量降至0.012 mg cm-2。3-5 nm的Pt顶层有效抑制了界面肖特基势垒的形成，而10-15 nm的PtTa混合层促进了电子通过氧化物的传递，确保了优异的导电性。同时，下面的耐腐蚀层为钛基板提供了可靠的保护。在2 V vs. SCE下进行48 h的耐久性测试后，在1.4 MPa下，界面接触电阻（ICR）保持在2.14 mΩ cm2的低水平，Ti溶解降低到0.23 ppb（占裸Ti的1.7 %）。这些结果表明，Pt/ tpt /Ta多层涂层为PEMWE中具有成本效益和耐用性的bp提供了可行的途径。

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引用次数: 0

Bridge for the thermodynamics and kinetics of electrochemical corrosion: Influence of trace fluctuations in alloying element content on the corrosion resistance of low alloy steels 电化学腐蚀的热力学和动力学桥梁：合金元素含量的微量波动对低合金钢耐蚀性的影响

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

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-14 DOI: 10.1016/j.corsci.2026.113628

Zinuo Wang, Peng Zhou, Tao Zhang, Fuhui Wang

The corrosion resistance of low-alloy steel exhibits a profound sensitivity to trace compositional fluctuations within the standard range, a paradox given the negligible corresponding changes in microstructure and mechanical properties. This longstanding puzzle has lacked a mechanistic understanding. Our work resolves this by introducing a synergistic framework that couples the dissolution-ionization-diffusion-deposition (DIDD) model with interpretable machine learning (ML). This approach decouples mechanism discovery from experimental constraints by using the DIDD model as a high-throughput, computational data generator, providing reliable datasets for ML training. Our findings definitively identify Mn as the pivotal element dictating corrosion performance in four Q420B steels. We further establish that corrosion resistance is enhanced at concentrations above 0.13 wt% Cr, 0.36 wt% Ni, and 0.19 wt% Cu, but is diminished beyond a threshold of 0.61 wt% Mn.

低合金钢的耐蚀性对标准范围内微量成分波动表现出高度敏感性，这是一个悖论，因为相应的微观结构和力学性能变化可以忽略不计。这个长期存在的谜题缺乏对机制的理解。我们的工作通过引入一个将溶解-电离-扩散-沉积（DIDD）模型与可解释机器学习（ML）耦合的协同框架来解决这个问题。该方法通过使用DIDD模型作为高吞吐量的计算数据生成器，将机制发现与实验约束解耦，为机器学习训练提供可靠的数据集。我们的研究结果明确地确定Mn是决定四种Q420B钢腐蚀性能的关键元素。我们进一步确定，当浓度高于0.13 wt% Cr、0.36 wt% Ni和0.19 wt% Cu时，耐蚀性增强，但超过0.61 wt% Mn时，耐蚀性减弱。

引用次数: 0

Effect of the solutionizing temperature on the strength and hydrogen embrittlement resistance of the laser powder bed fused Inconel 718 superalloy 溶化温度对激光粉末床熔合Inconel 718高温合金强度和抗氢脆性能的影响

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

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-01-19 DOI: 10.1016/j.corsci.2026.113642

Liuwei Zheng , Leilei Shen , Yingzhi Wang , Hongxia Wang , Yakai Zhao , Upadrasta Ramamurty , Jun Hu

Laser powder bed fusion (LPBF) enables the fabrication of complex, high-performance Inconel 718 (IN718) components with unique non-equilibrium microstructures that are characterized by cellular substructures, elemental segregation, and Laves phase formation. Applications of LPBF IN718 with high strength in hydrogen-rich environments are limited by their low hydrogen embrittlement (HE) resistance. Keeping this in view, we examine the role of solutionizing temperature on the strength and HE resistance of solutionized and double aged (SA) LPBF IN718 with the aid of slow strain rate tensile (SSRT) tests that are conducted in air as well as in situ hydrogen charging conditions. Results reveal that solutionizing at a relatively low-temperature of 980 °C (LSA) enhances strength while maintaining HE resistance comparable to the as-built alloy, owing to retained dislocation cellular networks decorated with the Laves phases and nanoscale γ'/γ'' precipitates that promote uniform hydrogen distribution and suppress strain localization. In contrast, high-temperature solutionizing at 1150 °C (HSA) results in the dissolution of cellular structures and recrystallization and grain growth that leads to a microstructure with coarse equiaxed grains. The latter facilitate rapid hydrogen diffusion along their boundaries, which results in severe intergranular cracking. These findings demonstrated that controlled, lower-temperature solutionizing enables a balanced optimization of strength and HE resistance in LPBF-produced precipitation-strengthened superalloys, providing valuable guidance for the post-processing design of materials intended for applications in hydrogen-rich environments.

激光粉末床熔合（LPBF）能够制造复杂、高性能的Inconel 718 （IN718）组件，该组件具有独特的非平衡微观结构，其特征是细胞亚结构、元素偏析和Laves相形成。高强度LPBF IN718在富氢环境中的应用受到其低氢脆（HE）抗性的限制。考虑到这一点，我们通过在空气和原位充氢条件下进行的慢应变速率拉伸（SSRT）试验，研究了固溶温度对固溶和双时效（SA） LPBF IN718的强度和HE抗性的作用。结果表明，在相对较低的980℃（LSA）固溶下，由于保留了由Laves相装饰的位错细胞网络和纳米级γ′/γ”沉淀，促进了均匀的氢分布，抑制了应变局部化，从而提高了强度，同时保持了与构建合金相当的HE电阻。相比之下，1150℃高温固溶（HSA）导致细胞结构溶解、再结晶和晶粒长大，形成粗糙等轴晶粒的微观组织。后者促进氢沿其边界的快速扩散，从而导致严重的晶间开裂。这些发现表明，受控的低温固溶可以平衡优化lpbf生成的沉淀强化高温合金的强度和HE抗性，为富氢环境下应用的材料后处理设计提供了有价值的指导。

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引用次数: 0

Synergistic effect of residual stress and sulfate-reducing bacteria on corrosion and mechanical degradation of M54 martensitic steel 残余应力和硫酸盐还原菌对M54马氏体钢腐蚀和机械降解的协同作用

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

Corrosion Science

Pub Date : 2026-04-15 Epub Date: 2026-02-01 DOI: 10.1016/j.corsci.2026.113674

Yufeng Zhang , Enze Zhou , Chenchong Wang , Wei Xu , Fuhui Wang , Dake Xu

This study systematically investigates the influence of residual stress on the microbiologically influenced corrosion (MIC) and mechanical properties of M54 martensitic steel in the presence of Desulfovibrio vulgaris. Controlled residual stress levels were applied, including low stress (LS, −215 ± 10 MPa), moderate stress (MS, −387 ± 19 MPa), and high stress (HS, −468 ± 23 MPa). The results indicated that residual stress significantly aggravated MIC susceptibility. In the biotic medium, the LS coupon exhibited superior MIC resistance, with a corrosion current density of 6.2 ± 0.2 μA cm⁻², weight loss of 1.1 ± 0.12 mg cm⁻², and average pit depth of 3.6 ± 0.3 μm. In contrast, the HS coupon showed severe corrosion damage, with corresponding values of 19.2 ± 2.1 μA cm⁻², 2.5 ± 0.12 mg cm⁻², and 6.1 ± 0.5 μm. Corrosion preferentially initiated at prior austenite grain boundaries (PAGBs), which served as electron donation sites for D. vulgaris. Stress concentration zones in the HS coupon further promoted intergranular attack and cracking. More critically, the synergistic effect of residual stress and microbial activity resulted in severe mechanical degradation, with the HS coupon suffering reductions of 18.9 % in yield strength, 10.1 % in tensile strength, and 27.3 % in elongation compared to the LS coupon in abiotic medium. These findings underscore the detrimental role of residual stress in accelerating MIC and mechanical failure, emphasizing the importance of stress management for enhancing the durability of martensitic steels in microbial environments.

本研究系统地研究了在普通脱硫弧菌存在下残余应力对M54马氏体钢微生物影响腐蚀（MIC）和力学性能的影响。控制残余应力水平应用,包括低压力(215 LS,− ±10  MPa),适度压力(387 MS,− ± 19 MPa),和高应力(HS−468 ± 23 MPa)。结果表明，残余应力显著加重了MIC敏感性。在生物介质中，LS复合材料表现出优异的耐MIC性能，腐蚀电流密度为6.2 ± 0.2 μA cm−2，失重1.1 ± 0.12 mg cm−2，平均坑深为3.6 ± 0.3 μm。HS腐蚀损伤严重，腐蚀损伤值分别为19.2 ± 2.1 μA cm−2、2.5 ± 0.12 mg cm−2和6.1 ± 0.5 μm。腐蚀优先发生在先前的奥氏体晶界（pagb），这是D. vulgaris的电子给能位点。HS层的应力集中区进一步促进了晶间攻击和开裂。更关键的是，残余应力和微生物活性的协同作用导致了严重的机械降解，与非生物培养基中的LS材料相比，HS材料的屈服强度降低了18.9 %，抗拉强度降低了10.1 %，延伸率降低了27.3 %。这些发现强调了残余应力在加速MIC和机械失效中的有害作用，强调了应力管理对提高微生物环境下马氏体钢耐久性的重要性。

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引用次数: 0

Amorphous CrN/CrAlN multilayer coating: Tailored interface design for enhanced corrosion and wear resistance in marine engineering environments 非晶CrN/CrAlN多层涂层：定制界面设计，增强海洋工程环境的耐腐蚀和耐磨性

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.2026.113684

Xing Xu , Guozheng Ma , Jiadong Shi , Fenghua Su

The realization of amorphous structures was typically desired to achieve the superior protection of transition metal nitride coatings. Here, an amorphous CrN/CrAlN multilayer coating was first synthesized on aluminum alloy via tailored interface design using DC magnetron sputtering. The findings revealed that tailored interface design successfully generated the CrN/CrAlN multilayer coating with a completely amorphous structure, unlike the partially crystalline structure observed in CrN and CrAlN monolayer coatings. Thanks to the aforementioned structural optimization, the amorphous CrN/CrAlN multilayer coating exhibited the finest mechanical properties. The compact amorphous microstructure and multilayer interfaces endowed the CrN/CrAlN coating with extremely superior corrosion resistance in 3.5 % NaCl solution Simultaneously, with the help of excellent mechanical properties, the amorphous multilayer coating achieved a minimum wear rate of 1.58 × 10⁻⁵ mm³ /Nm, which was nearly 200 times lower than that of the aluminum alloy. This work paves the way for the fabrication of amorphous transition metal nitride coating by tailored interface design.

非晶结构的实现是实现过渡金属氮化涂层的优良保护的典型要求。本文采用直流磁控溅射技术，通过定制界面设计，首次在铝合金表面合成了非晶CrN/CrAlN多层涂层。研究结果表明，定制界面设计成功地生成了具有完全非晶结构的CrN/CrAlN多层涂层，而不是在CrN和CrAlN单层涂层中观察到的部分结晶结构。由于上述结构优化，非晶CrN/CrAlN多层涂层表现出最好的力学性能。致密的非晶态组织和多层界面使CrN/CrAlN涂层在3.5 % NaCl溶液中具有极好的耐蚀性，同时，凭借优异的力学性能，非晶态多层涂层的最小磨损率为1.58 × 10⁻- 5 mm³ /Nm，比铝合金低近200倍。本研究为通过定制界面设计制备非晶过渡金属氮化物涂层铺平了道路。

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引用次数: 0

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