Corrosion Science最新文献_第6页

Effects of Cu content and Ga addition on suppressing intergranular corrosion of copper substrate in stainless steel/copper vacuum brazed joints Cu含量和Ga对抑制不锈钢/铜真空钎焊接头中铜基体晶间腐蚀的影响

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

Corrosion Science

Pub Date : 2026-01-05 DOI: 10.1016/j.corsci.2026.113605

Guoqian Mu , Dongping Gao , Wenqing Qu , Xiaohong Li , Yanhua Zhang , Hongshou Zhuang

The intergranular corrosion of copper substrates caused by molten Ag-Cu based brazing alloys during the vacuum brazing of copper/stainless steel joints significantly compromises the structural integrity of assemblies in microwave vacuum electronic devices. This study presents a metallurgical approach to suppress intergranular liquid filler corrosion by modifying brazing alloy chemistry. It was found that both increasing the Cu content and adding Ga to Ag-Cu28-Ni0.75 brazing alloys effectively inhibit intergranular corrosion. A higher Cu content promotes the formation of a saturated liquid phase, thereby reducing the thermodynamic driving force for dissolution of solid copper. Meanwhile, the addition of Ga alters the composition and properties of the interfacial copper solid solution layer. Gallium facilitates uniform dissolution of the solid copper substrate rather than localized intergranular attack, thereby enhancing the mutual solubility between the solid and liquid. Based on these mechanisms, new quaternary Ag-Cu-Ni-Ga alloys were designed. The optimized Ag-Cu45-Ni-Ga9 and Ag-Cu50-Ni-Ga10 alloys completely suppressed intergranular corrosion at a brazing temperature of 870 ℃, producing sound joints free of cracks and pores. These newly developed brazing alloys consist of blocky copper solid solution and Ag-rich eutectic structure, with moderate hardness and good processability, without intermetallic compounds or liquid phase separation. The solidus and liquidus temperatures are 732–839 ℃ for Ag-Cu45-Ni-Ga9, and 734–847 ℃ for Ag-Cu50-Ni-Ga10. These results confirm that the intergranular corrosion of copper substrates is fundamentally associated with the grain boundary dissolution of solid copper.

微波真空电子器件中铜/不锈钢接头真空钎焊过程中，银铜基钎焊合金熔液对铜衬底造成晶间腐蚀，严重影响组件的结构完整性。本文提出了一种通过改变钎焊合金的化学性质来抑制晶间液体填料腐蚀的冶金方法。结果表明，在Ag-Cu28-Ni0.75钎焊合金中增加Cu含量和添加Ga均能有效抑制晶间腐蚀。较高的Cu含量促进了饱和液相的形成，从而降低了固体铜溶解的热力学驱动力。同时，Ga的加入改变了界面铜固溶层的组成和性能。镓有利于固体铜底物的均匀溶解，而不是局部的晶间攻击，从而增强了固液之间的相互溶解度。基于这些机理，设计了新型四元合金Ag-Cu-Ni-Ga。优化后的Ag-Cu45-Ni-Ga9和Ag-Cu50-Ni-Ga10合金在870℃的钎焊温度下完全抑制了晶间腐蚀，产生了无裂纹和气孔的良好接头。这些新开发的钎焊合金由块状铜固溶体和富银共晶组织组成，具有中等硬度和良好的加工性能，无金属间化合物和液相分离。Ag-Cu45-Ni-Ga9固相温度为732 ~ 839℃，Ag-Cu50-Ni-Ga10固相温度为734 ~ 847℃。这些结果证实了铜基体的晶间腐蚀从根本上与固体铜的晶界溶解有关。

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引用次数: 0

Superior hydrogen embrittlement resistance of WAAM Ti-6Al-4V compared to wrought alloy under gaseous hydrogen charging 在气体充氢条件下，WAAM Ti-6Al-4V合金的抗氢脆性能优于变形合金

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

Corrosion Science

Pub Date : 2026-01-05 DOI: 10.1016/j.corsci.2025.113591

Soobin Kim , Yuanjiu Huang , Dong-Hyuck Kam , Jin-Yoo Suh , Kee-Ahn Lee

This study demonstrates the superior hydrogen embrittlement (HE) resistance of Ti-6Al-4V fabricated by wire arc additive manufacturing (WAAM) compared with its wrought counterpart under high-pressure gaseous hydrogen charging (300 °C, 15 MPa, 72 h). After hydrogen exposure, both alloys exhibited increased strength; however, their ductility responses differed significantly. The WAAM specimen retained stable tensile properties, with elongation decreasing from 9.33 % to 8.91 %, corresponding to a HE index (HEI) of only 4.5 %. In contrast, the wrought specimen showed a substantial ductility reduction, from 10.42 % to 7.73 %, resulting in an HEI of 25.8 % and indicating much higher susceptibility to embrittlement. Microstructural and crystallographic analyses revealed that the continuous α/β lamellar structure in WAAM activated hydrogen-enhanced localized plasticity (HELP) in a spatially distributed manner across multiple interfaces in conjunction with dual hydrogen-trapping states. Such interfacial dislocation activity facilitated slip transfer and alleviated strain localization, thereby enabling a more uniform macroscopic deformation response. Conversely, the wrought alloy exhibited highly localized HELP together with hydrogen-enhanced decohesion (HEDE) within the β phase, associated with a single deep trapping state that accelerated premature cracking. These results highlight that the unique interfacial network generated by WAAM mitigates hydrogen-induced damage and preserves ductility, underscoring its potential as a titanium structural material suitable for hydrogen-containing environments.

在高压气体充氢（300°C, 15 MPa, 72 h）条件下，采用电弧增材制造（WAAM）法制备的Ti-6Al-4V合金具有较好的抗氢脆（HE）性能。氢暴露后，两种合金的强度均有所提高；然而，它们的延性反应有显著差异。WAAM试样保持了稳定的拉伸性能，伸长率从9.33 %下降到8.91 %，HE指数（HEI）仅为4.5 %。相比之下，变形后的试样显示出明显的塑性降低，从10.42 %降至7.73 %，导致HEI为25.8 %，表明脆性敏感性更高。显微组织和晶体学分析表明，WAAM激活氢增强局部塑性（HELP）的连续α/β片层结构在多个界面上以空间分布的方式分布，并伴有双氢俘获态。这种界面位错活动促进了滑移传递，缓解了应变局部化，从而使宏观变形响应更加均匀。相反，变形后的合金在β相中表现出高度局域化的HELP和氢增强脱粘（HEDE），与单一深俘获态相关，加速了过早开裂。这些结果强调了WAAM产生的独特界面网络减轻了氢引起的损伤并保持了延展性，强调了其作为适合含氢环境的钛结构材料的潜力。

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引用次数: 0

Texture and nano-precipitates synergistically suppress hydrogen embrittlement susceptibility in titanium-free maraging steel 织构和纳米析出相协同抑制无钛马氏体时效钢的氢脆敏感性

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

Corrosion Science

Pub Date : 2026-01-05 DOI: 10.1016/j.corsci.2026.113599

Xin Liu , Kaiyu Zhang , Wanliang Zhang , Jinrong Wu , Kehang Wu , Chengshuang Zhou , Lin Zhang , Jinyang Zheng

This study modifies the texture and precipitation phases of titanium-free maraging steel by adjusting the heat treatment process, thereby enhancing its resistance to hydrogen embrittlement and toughness without compromising the steel's strength. The results revealed three key advancements: (i) ω-precipitates and reversed austenite acted as hydrogen traps, delaying hydrogen diffusion; the subsequent formation of the Laves phase further enhanced this effect, significantly reducing the hydrogen diffusion coefficient by 71.3 %; (ii) incomplete recrystallization of austenite before quenching inhibited the formation of martensite variants, resulting in a pronounced < 110 > //RD fiber texture that effectively altered the crack propagation path—a texture mechanism previously overlooked in hydrogen embrittlement studies; (iii) analysis of the crack path and thermal desorption spectra of SLLA-480 demonstrated that reversed austenite served as a hydrogen trap, inhibiting hydrogen diffusion, while dispersed reversed austenite had limited capacity to impede crack propagation in high-strength maraging steel. Due to these synergistic mechanisms, the SLLA-480 process reduced hydrogen embrittlement sensitivity by 17 % without compromising strength. This work deepens our understanding of the hydrogen embrittlement mechanism in maraging steel and proposes a microstructure design strategy based on the synergistic control of nanoprecipitates and crystal texture—a strategy particularly important for titanium-free maraging steel systems.

本研究通过调整热处理工艺来改变无钛马氏体时效钢的织构和析出相，从而在不影响钢强度的前提下提高其抗氢脆和韧性。结果显示了三个关键进展：(1)ω-沉淀和反向奥氏体作为氢阱，延缓氢的扩散；随后Laves相的形成进一步增强了这一效应，使氢扩散系数显著降低71.3 %；（ii）淬火前奥氏体的不完全再结晶抑制了马氏体变体的形成，导致显著的<； 110 >； //RD纤维织构，有效地改变了裂纹扩展路径——这是以前在氢脆研究中忽略的织构机制；（iii） SLLA-480的裂纹路径和热解吸光谱分析表明，在高强马氏体时效钢中，反向奥氏体作为氢阱，抑制氢扩散，而分散的反向奥氏体对裂纹扩展的抑制能力有限。由于这些协同机制，SLLA-480工艺在不影响强度的情况下降低了17% %的氢脆敏感性。这项工作加深了我们对马氏体时效钢中氢脆机制的理解，并提出了一种基于纳米沉淀和晶体织构协同控制的微观结构设计策略——这一策略对无钛马氏体时效钢体系尤其重要。

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引用次数: 0

Robust corrosion resistance enabled by in-situ oxygen-tailored microstructure of CrNbTiZr multi-principal element coating CrNbTiZr多主元素涂层的原位氧定制显微结构使其具有强大的耐腐蚀性

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

Corrosion Science

Pub Date : 2026-01-05 DOI: 10.1016/j.corsci.2026.113602

Jun Fan , Hongwei Yao , Kai Xu , Gang Liu , Jibin Pu

Corrosion is the primary challenge for metallic materials serving in marine environments, and the pursuit of lower corrosion rate and more stable passivation remains perpetual. However, these two key properties are difficult to simultaneously optimize for traditional metallic materials. Oxygen, typically treated as an impurity during the smelting process of metallic materials, requires strict control. In contrast, oxygen in marine environments can promote the formation of dense passive films on metal surfaces. In this work, in-situ incorporation of oxygen into a novel CrNbTiZr multi-principal element coating was implemented to achieve the synergistic regulation of corrosion rate and passivation behavior. In NaCl solution, the self-corrosion current density of the coating was reduced by approximately two orders of magnitude compared to traditional 304 stainless steel and its passivation potential even outperformed that of titanium alloys. The excellent corrosion resistance originates from the microstructural transformation of CrNbTiZr from BCC to amorphous state induced by controlled oxygen content. The collapsed BCC phase enables more uniform distribution of Nb/Ti passivating elements within the amorphous phase. Additionally, the formation of local (covalent) bonds between oxygen and metal atoms reduces the element dissolution rate, facilitating the formation of a uniform-thickness and dense double-layer passive film across different phases on the surface of the coating. The high-quality passive film and dense intrinsic structure of coatings significantly enhance the resistance of Cl⁻ attack, endowing the coating with potential applications in marine engineering. This work highlights the beneficial effect of in-situ oxygen incorporation on the corrosion resistance of metallic materials, providing a new strategy for the design of metallic materials with high corrosion resistance in harsh environments.

腐蚀是金属材料在海洋环境中的主要挑战，追求更低的腐蚀速率和更稳定的钝化仍然是永恒的。然而，传统金属材料很难同时优化这两个关键性能。在金属材料的冶炼过程中，氧通常被视为杂质，需要严格控制。相反，海洋环境中的氧气可以促进金属表面致密钝化膜的形成。在这项工作中，将氧原位掺入一种新型的CrNbTiZr多主元素涂层中，以实现腐蚀速率和钝化行为的协同调节。在NaCl溶液中，涂层的自腐蚀电流密度比传统304不锈钢降低了约两个数量级，其钝化电位甚至优于钛合金。优异的耐蚀性源于控制氧含量诱导CrNbTiZr由BCC态向无定形态转变的微观组织。BCC相的塌缩使得Nb/Ti钝化元素在非晶相内的分布更加均匀。此外，氧和金属原子之间局部（共价键）的形成降低了元素的溶解速度，有利于在涂层表面不同相上形成厚度均匀、致密的双层钝化膜。高质量的钝化膜和致密的内在结构显著增强了涂层对Cl -毒血症的抵抗能力，使涂层在海洋工程中具有潜在的应用前景。本工作强调了原位氧掺入对金属材料耐腐蚀性能的有益影响，为在恶劣环境下设计高耐腐蚀金属材料提供了新的策略。

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引用次数: 0

The influence of pre-compression/tension induced deformation mechanisms on the corrosion behavior of AM60 Mg alloy 预压缩/拉伸变形机制对AM60镁合金腐蚀行为的影响

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

Corrosion Science

Pub Date : 2026-01-05 DOI: 10.1016/j.corsci.2026.113596

Lili Liu , Haiyang Jiang , Quan Shan , Junlei Zhang , Xiang Chen , Zulai Li , Dawei Wang , Guangsheng Huang

This study systematically investigated, through a combination of experimental characterization and first-principles calculations, the influence of pre-deformation modes on the microstructural evolution and corrosion behavior of AM60 magnesium alloy. The results indicated that basal slip was the dominant mechanism during pre-tension, leading to significant dislocation multiplication. In contrast, pre-compression activated extensive twinning, which resulted in grain refinement and a reorientation of the grain c-axis by ∼86.5°. Mechanical testing indicated that pre-deformation improved the alloy's strength at the expense of ductility; the yield strength increased by ∼50 MPa, and the elongation reduced by ∼1.6 % (pre-tension) and ∼5.2 % (pre-compression). Corrosion results revealed that the corrosion rates of the pre-tensioned and pre-compressed samples increased to 2.01 and 1.19 times that of the initial state, respectively. The high-density dislocations generated by pre-tension formed preferential corrosion channels, which promoted cracking of the surface product film, thereby accelerating localized corrosion. Conversely, the twins introduced by pre-compression refined the grain structure, which effectively alleviated the tensile stress within the product film and facilitated the formation of a dense protective layer. First-principles calculations further revealed the dual role of

{10 \overset{̅}{1} 2}

extension twins. Although their high interfacial energy (90.4 mJ/m²) decreased atomic stability, the high-density twin distribution in the pre-compressed specimen reduced its surface energy (1.431 J/cm²) compared to the pre-tensioned specimen (1.465 J/cm²), while simultaneously diminishing the energy differences among grains. The synergistic effect between surface energy optimization and grain refinement collectively contributes to the superior corrosion resistance of pre-compressed specimens over pre-tensioned ones.

本研究通过实验表征和第一性原理计算相结合的方法，系统研究了预变形模式对AM60镁合金微观组织演变和腐蚀行为的影响。结果表明，基底滑移是预拉伸过程中的主要机制，导致位错倍增。相比之下，预压缩激活了广泛的孪晶，导致晶粒细化和晶粒c轴的重定向约86.5°。力学试验表明，预变形以牺牲塑性为代价提高了合金的强度；屈服强度提高了~ 50 MPa，伸长率降低了~ 1.6 %（预拉伸）和~ 5.2 %（预压缩）。腐蚀结果表明，预拉伸和预压缩试样的腐蚀速率分别是初始状态的2.01倍和1.19倍。预拉伸产生的高密度位错形成了优先腐蚀通道，促进了表面产品膜的开裂，从而加速了局部腐蚀。相反，预压缩引入的孪晶细化了晶粒组织，有效地缓解了产品膜内的拉应力，有利于形成致密的保护层。第一性原理计算进一步揭示了{101′2}扩展双生子的双重作用。虽然高界面能（90.4 mJ/m2）降低了原子稳定性，但高密度孪晶在预压缩试样中的分布比预拉伸试样（1.465 J/cm2）降低了表面能（1.431 J/cm2），同时减小了晶粒间的能差。表面能优化和晶粒细化的协同作用共同导致预压缩试样的耐蚀性优于预拉伸试样。

{"title":"The influence of pre-compression/tension induced deformation mechanisms on the corrosion behavior of AM60 Mg alloy","authors":"Lili Liu , Haiyang Jiang , Quan Shan , Junlei Zhang , Xiang Chen , Zulai Li , Dawei Wang , Guangsheng Huang","doi":"10.1016/j.corsci.2026.113596","DOIUrl":"10.1016/j.corsci.2026.113596","url":null,"abstract":"<div><div>This study systematically investigated, through a combination of experimental characterization and first-principles calculations, the influence of pre-deformation modes on the microstructural evolution and corrosion behavior of AM60 magnesium alloy. The results indicated that basal slip was the dominant mechanism during pre-tension, leading to significant dislocation multiplication. In contrast, pre-compression activated extensive twinning, which resulted in grain refinement and a reorientation of the grain c-axis by ∼86.5°. Mechanical testing indicated that pre-deformation improved the alloy's strength at the expense of ductility; the yield strength increased by ∼50 MPa, and the elongation reduced by ∼1.6 % (pre-tension) and ∼5.2 % (pre-compression). Corrosion results revealed that the corrosion rates of the pre-tensioned and pre-compressed samples increased to 2.01 and 1.19 times that of the initial state, respectively. The high-density dislocations generated by pre-tension formed preferential corrosion channels, which promoted cracking of the surface product film, thereby accelerating localized corrosion. Conversely, the twins introduced by pre-compression refined the grain structure, which effectively alleviated the tensile stress within the product film and facilitated the formation of a dense protective layer. First-principles calculations further revealed the dual role of <span><math><mrow><mspace></mspace><mo>{</mo><mn>10</mn><mover><mrow><mn>1</mn></mrow><mo>̅</mo></mover><mn>2</mn><mo>}</mo></mrow></math></span> extension twins. Although their high interfacial energy (90.4 mJ/m<sup>2</sup>) decreased atomic stability, the high-density twin distribution in the pre-compressed specimen reduced its surface energy (1.431 J/cm<sup>2</sup>) compared to the pre-tensioned specimen (1.465 J/cm<sup>2</sup>), while simultaneously diminishing the energy differences among grains. The synergistic effect between surface energy optimization and grain refinement collectively contributes to the superior corrosion resistance of pre-compressed specimens over pre-tensioned ones.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"261 ","pages":"Article 113596"},"PeriodicalIF":7.4,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tribocorrosion resistance of high entropy alloy CoCrFeNiTix in simulated seawater 高熵合金CoCrFeNiTix在模拟海水中的耐摩擦腐蚀性能

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

Corrosion Science

Pub Date : 2026-01-03 DOI: 10.1016/j.corsci.2026.113595

Wang Diao , Junwei Wang , Li Lu , Bo Li , Leyang Dai , Jun Cheng , Haifeng Liao , Xiangning Wang , Zhenjie Wang , Zhilong Xu

The anti-tribocorrosion mechanisms of CoCrFeNiTi_x (x = 0.0, 0.1, 0.3, 0.5, 1.0) in simulated seawater were investigated quantitatively. At low Ti content (Ti_0.1), corrosion-promoted wear (ΔW_c) is pronounced due to rapid repassivation, resulting in a high tribocorrosion rate. At higher Ti contents (Ti_0.5 and Ti_1.0), the Laves phase (L-phase) delaminates after the R phase (HCP structure similar to Ni₃Fe) is corroded, also leading to a high tribocorrosion rate. The Ti_0.3 alloy exhibits outstanding tribocorrosion resistance (4.35 × 10⁻⁶ mm³/(N·m)) due to the anodic protection by the R phase. Improving wear resistance and reducing the L phase are beneficial for enhancing its tribocorrosion resistance.

对CoCrFeNiTix （x = 0.0,0.1,0.3,0.5,1.0）在模拟海水中的抗摩擦腐蚀机理进行了定量研究。在低Ti含量（Ti0.1）时，由于快速的再钝化，腐蚀促进磨损（ΔWc）明显，导致高摩擦腐蚀速率。当Ti含量较高（Ti0.5和Ti1.0）时，R相（HCP结构与Ni3Fe相似）被腐蚀后，Laves相（l相）发生分层，导致摩擦腐蚀速率较高。由于R相的阳极保护，Ti0.3合金具有良好的耐摩擦腐蚀性能（4.35 × 10−6 mm³/(N·m)）。提高耐磨性，减少L相有利于提高其耐摩擦腐蚀性能。

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 : 2026-01-02 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

Type II hot corrosion of the polycrystalline nickel-based superalloy AD730 in presence of Na2SO4 and Na2SO4-MgSO4 deposits Na2SO4和Na2SO4- mgso4沉积存在下多晶镍基高温合金AD730的II型热腐蚀

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

Corrosion Science

Pub Date : 2026-01-02 DOI: 10.1016/j.corsci.2026.113592

D. Diomande, P-J. Panteix, S. Migot, J. Ghanbaja, L. Aranda, C. Clément, M. Vilasi, S. Mathieu

The type II corrosion resistance of AD730 was studied at 650 °C and 700 °C in air + 400 ppm SO₂ (g), in the presence of Na₂SO₄ and Na₂SO₄-MgSO₄ deposits. At 650°C, the pit-like attacks were of similar depth for both salts and less severe than those observed at 700°C. Although the sulfate mixture (Na₂SO₄-MgSO₄) was liquid at 700°C from the beginning of the exposure, it proved to be less aggressive than Na₂SO₄. Wavelength dispersive spectrometry characterization of the pits revealed the systematic stratification of the oxides from the alloy-corrosion products interface toward the corrosion products-gas interface across the pit corrosion products, i.e. the establishment of a gradient of oxygen ions activity. High resolution transmission electron microscopy highlighted a high level of porosity, sulfur enrichment as well as the presence of the WS₂ sulfide, with an anisotropic bidimensional structure, located at the alloy-oxide interface. Sulfation tests carried out on nickel oxide and cobalt oxide in the presence of Na₂SO₄ and Na₂SO₄-MgSO₄ showed little sulfation with the magnesium-containing salt, thus demonstrating how MgSO₄ contributes to limit the corrosion at 700°C. The results demonstrated that the severe hot corrosion attacks are not only related to the formation of a liquid phase, but also to its chemical composition.

研究了AD730在650℃和700℃空气+ 400 ppm SO2 (g)、Na2SO4和Na2SO4- mgso4沉积条件下的II型耐蚀性。在650°C时，两种盐的坑状腐蚀深度相似，并且比在700°C时观察到的严重。虽然硫酸盐混合物（Na2SO4- mgso4）在700°C时是液态的，但它的侵蚀性比Na2SO4小。波长色散光谱表征表明，氧化物从合金-腐蚀产物界面向腐蚀产物-气体界面跨坑腐蚀产物有系统的分层，即氧离子活性梯度的建立。在高分辨率透射电镜下，发现了高孔隙度、硫富集以及位于合金-氧化物界面的WS2硫化物的存在，具有各向异性的二维结构。在Na2SO4和Na2SO4-MgSO4存在下对氧化镍和氧化钴进行的磺化试验表明，含镁盐几乎没有磺化作用，从而证明了MgSO4如何有助于限制700°C下的腐蚀。结果表明，严重的热腐蚀不仅与液相的形成有关，而且与其化学成分有关。

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引用次数: 0

The effect of sigma phase of 2507 duplex stainless steel on hydrogen-induced pitting corrosion 2507双相不锈钢sigma相对氢致点蚀的影响

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

Corrosion Science

Pub Date : 2026-01-02 DOI: 10.1016/j.corsci.2026.113594

Huafeng Liu , Baolong Jiang , Xiaohuan Du , Xuerong Zheng , Zhenyu Wang , Hua Yang , Tao Xu , Ang Xiao , Yue Pan , Weiting Yang , Yida Deng

The influence of σ phase content, adjusted by heat treatment, and the σ phase distribution/content and hydrogen interaction on the pitting corrosion of 2507 duplex stainless steel was investigated through electrochemical hydrogen-charging, electrochemical measurements, and immersion tests. It indicates that the σ-phase content reaches a peak area fraction of 18 % at 850 °C. The most severe hydrogen enrichment occurs at the σ/γ₂ phase boundaries, followed by within the γ₂ and σ phases, correlating with the Cr/Mo concentrations and the resultant galvanic coupling. Consequently, hydrogen-induced pitting corrosion initiates most severely at the phase boundaries and subsequently propagates into the γ₂ phase.

通过电化学充氢、电化学测量和浸渍试验，研究了热处理后σ相含量、σ相分布/含量和氢相互作用对2507双相不锈钢点蚀的影响。结果表明，在850℃时，σ相含量达到峰值面积分数18 %。最严重的氢富集发生在σ/γ 2相交界处，其次是在γ 2和σ相交界处，这与Cr/Mo浓度和由此产生的电偶联有关。因此，氢致点蚀在相界处开始最严重，随后扩展到γ₂相。

引用次数: 0

Quantitative insights into hydrogen embrittlement in two-step aged 7xxx aluminum alloys 两步时效7xxx铝合金氢脆的定量分析

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

Corrosion Science

Pub Date : 2026-01-02 DOI: 10.1016/j.corsci.2025.113590

Yafei Wang , Hiroyuki Toda , Hiro Fujihara , Kazuyuki Shimizu , Kyosuke Hirayama

Nanoscopic η-MgZn₂ precipitates are crucial for strengthening aluminum alloys but has recently been reported to be a primary source of hydrogen embrittlement. Two-step over-aging has been used to mitigate this issue, traditionally attributed to η precipitate evolution. However, recent studies highlight the hydrogen-trapping capability of T-phase precipitates, suggesting their role in practical alloys has been historically overlooked. The present study confirms and quantifies T-phase precipitates in both one-step and two-step over-aged high-Zn 7xxx Al alloys, aiming to isolate their effect on hydrogen embrittlement from industrial aging treatments. Results show that at the same strength level, two-step aged alloys exhibit higher hydrogen resistance than their one-step aged counterparts, which cannot be explained by η precipitate coarsening alone. Instead, this improvement is attributed to an increased fraction of hydrogen-trapping T-phase precipitates, as supported by high-resolution transmission electron microscopy. This finding creates opportunities for optimizing industrial aging techniques to develop next-generation hydrogen-resistant aluminum alloys.

纳米级的η-MgZn 2沉淀对于强化铝合金是至关重要的，但最近有报道称它是氢脆的主要来源。两步过时效已被用来缓解这一问题，传统上归因于η析出物的演变。然而，最近的研究强调了t相沉淀的捕氢能力，这表明它们在实际合金中的作用一直被忽视。本研究确认并量化了一步时效和两步时效高zn 7xxx铝合金中的t相沉淀，旨在分离它们对工业时效处理氢脆的影响。结果表明，在相同强度水平下，两步时效合金的抗氢性能高于一步时效合金，这不能仅仅用η相粗化来解释。相反，这种改善归因于氢捕获t相沉淀物的比例增加，正如高分辨率透射电子显微镜所支持的那样。这一发现为优化工业时效技术以开发下一代抗氢铝合金创造了机会。

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引用次数: 0