Corrosion Science最新文献_第4页

New insights into HCl-induced low-temperature corrosion in biomass- and waste-fired boilers 生物质和废物燃烧锅炉中盐酸引起的低温腐蚀的新见解

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

Corrosion Science

Pub Date : 2025-12-27 DOI: 10.1016/j.corsci.2025.113587

Farzad Jafarihonar , Alessandro Ruozzi , Hanna Kinnunen , Leena Hupa , Emil Vainio

This study investigates the risk of low-temperature corrosion on carbon steel tube surfaces located at the clean side of the flue gas channel downstream of a selective catalytic reduction (SCR) unit in a full-scale bubbling fluidized bed (BFB) boiler, where the HCl(g) concentration is typically very low (<5 ppm_v). Short- and long-term corrosion probe measurements, along with online deposit monitoring, were carried out in the flue gas channel to determine the causes of corrosion and establish safe material temperatures. To further investigate the results, laboratory tests were conducted in a quartz-tube furnace under simulated flue gas conditions. The results demonstrated that corrosion rates increased once the material surface temperature fell below 90 °C, with particularly severe attack evident at 80 and 70 °C. Notably, a considerable amount of chlorine was present in the corrosion products, indicating a high risk of chlorine-induced corrosion at cold-end surfaces, even at very low HCl(g) concentrations. Two potential corrosion mechanisms were identified, namely the absorption of HCl(g) into surface-adsorbed water monolayers above the water dew point, and the presence of corrosive NH₄Cl(s,aq) on tube surfaces. HCl-induced corrosion was found to be the most likely mechanism. According to this mechanism, corrosion can occur even without bulk water condensation, and it depends on the local relative humidity (RH) at the steel surface. The findings collectively suggest that carbon steel surfaces on the clean side of the flue gas path should be maintained above approximately 90 °C (with an appropriate safety margin, depending on flue gas H₂O(g) concentration) to mitigate the observed HCl-induced corrosion. A similar corrosion mechanism may also affect the dirty side of the flue gas path at similarly low temperatures.

本研究调查了位于全尺寸鼓泡流化床（BFB）锅炉中选择性催化还原（SCR）装置下游烟气通道清洁侧的碳钢管表面的低温腐蚀风险，其中HCl(g)浓度通常非常低（<5 ppmv）。在烟气通道中进行了短期和长期腐蚀探针测量以及在线沉积物监测，以确定腐蚀原因并确定安全的材料温度。为了进一步研究结果，在模拟烟气条件下的石英管炉中进行了实验室测试。结果表明，当材料表面温度低于90℃时，腐蚀速率增加，在80℃和70℃时腐蚀尤为严重。值得注意的是，腐蚀产物中存在相当数量的氯，这表明即使在非常低的HCl(g)浓度下，冷端表面也存在氯引起腐蚀的高风险。确定了两种潜在的腐蚀机制，即HCl(g)被吸收到水露点以上的表面吸附水单层中，以及腐蚀性NH4Cl（s,aq）在管表面的存在。盐酸腐蚀是最可能的腐蚀机制。根据这一机制，即使没有大量冷凝水，腐蚀也会发生，这取决于钢表面的局部相对湿度（RH）。研究结果共同表明，烟气路径清洁一侧的碳钢表面应保持在约90°C以上（根据烟气H2O(g)浓度有适当的安全裕度），以减轻所观察到的盐酸引起的腐蚀。类似的腐蚀机制也可能在类似的低温下影响烟气路径的脏侧。

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引用次数: 0

Corrigendum to “Premature breakaway oxidation of ferritic stainless steels triggered by austenitization” [Corros. Sci. 256 (2025) 113260] “由奥氏体化引起的铁素体不锈钢过早分离氧化”的勘误表[腐蚀]。科学通报。256 (2025)113260]

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

Corrosion Science

Pub Date : 2025-12-27 DOI: 10.1016/j.corsci.2025.113578

Anton Chyrkin, Jan Froitzheim

引用次数: 0

Comparing the oxidation behaviour of three generations of single crystal nickel-based superalloys at an intermediate service temperature 比较三代单晶镍基高温合金在中等使用温度下的氧化行为

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

Corrosion Science

Pub Date : 2025-12-26 DOI: 10.1016/j.corsci.2025.113582

Joseph C. Doyle , Edward A. Saunders , Jane M. Woolrich , Mark E. Light , Nong Gao , Philippa A.S. Reed

The oxidation behaviours of three different generations of single crystal Ni-based superalloys (SRR-99 – 1st generation, CMSX-4 – 2nd generation, and CMSX-10N – 3rd generation) have been investigated and compared at 550 °C. Isothermal oxidation tests were carried out at various exposure times ranging from 2 h up to 1000 h and it was found that oxide morphology and development showed noticeable differences between the alloys. Scanning electron microscopy (SEM), 3D imaging reconstruction, energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were employed to characterise the oxide scales. The external and internal oxides were studied through high-resolution imaging, measurements from which revealed the oxidation kinetics of CMSX-4 and CMSX-10N followed a near-parabolic law whilst a logarithmic law better described the kinetics behaviour of SRR-99. Thermodynamic modelling was used to predict the species and composition of oxides formed in each alloy and compared to measured EDS and XRD results. From the experimental results and modelling, it was found that the mechanism and oxide products formed for CMSX-4 and CMSX-10N are very similar, as NiO initially formed externally over the γ channels and the γ’ precipitates were preferentially oxidised internally at the γ/γ’ interface.

研究了三代单晶镍基高温合金（第一代SRR-99、第二代CMSX-4和第三代CMSX-10N）在550℃下的氧化行为。在2 h到1000 h的不同暴露时间下进行等温氧化试验，发现合金之间的氧化物形态和发育有明显的差异。采用扫描电镜（SEM）、三维成像重建、能量色散x射线能谱（EDS）和x射线衍射（XRD）对氧化鳞片进行表征。通过高分辨率成像研究了外部和内部氧化物，测量结果显示CMSX-4和CMSX-10N的氧化动力学遵循近抛物线定律，而对数定律更好地描述了SRR-99的动力学行为。利用热力学模型预测了每种合金中形成的氧化物的种类和组成，并与EDS和XRD的测量结果进行了比较。从实验结果和模拟结果来看，CMSX-4和CMSX-10N的氧化机制和氧化产物非常相似，NiO最初是在γ通道上形成的，而γ′沉淀在γ/γ′界面上优先被氧化。

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引用次数: 0

Microstructure-dependent high-temperature oxidation behavior of Mn-Containing β-solidifying γ-TiAl alloys 含锰β-凝固γ-TiAl合金的显微组织高温氧化行为

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

Corrosion Science

Pub Date : 2025-12-26 DOI: 10.1016/j.corsci.2025.113579

Junjie Hao , Chuanyi Chen , Peng Xue , Bo Chen , Lei Shu , Mengshu Zhang , Hongzhi Niu , Xiaobing Li , Kui Liu

Heat-treated Ti-44Al-3Mn-0.4Mo-0.4W-0.1B-0.1 C alloy with near-lamellar (NL) and equiaxed microstructures (EQ) underwent 100-hour cyclic oxidation at 750/800 °C and 100–3000 h isothermal oxidation at 750 °C. The microstructural evolution and oxidation behavior were characterized using SEM, EPMA, EBSD, EDS, XRD, and TEM. Results demonstrate that the oxidation kinetics of both microstructures approximately follow near-linear law during cyclic oxidation. The surface oxidation products primarily consist of a mixture of rutile and α-Al₂O₃, accompanied by minor amounts of TiN_xO_y (fcc) and α-Mn₂O₃. The EQ microstructure exhibits marginally superior oxidation resistance compared to the NL microstructure, with both forming intact oxide scales devoid of cracking or spallation. The transition layer primarily consists of Laves phases with minor β_o phases. Notably, under long-term isothermal oxidation, the NL microstructure demonstrates significantly enhanced oxidation resistance compared to the EQ structure. Phase transformation near the oxide layer in the NL structure generates a diffusion zone comprising (β_o+γ+Laves) phases. This transformation facilitates the formation of a dense and structurally coherent transition layer with reduced β_o phase content, effectively suppressing outward Mn diffusion and substantially improving oxidation resistance. Conversely, the EQ microstructure shows no significant phase transformation near the oxide layer. Abundant β_o phases were found in the transition layer that compromise structural integrity, resulting in inferior oxidation performance.

热处理后的Ti-44Al-3Mn-0.4Mo-0.4W-0.1B-0.1 近片层组织（NL）和等轴组织（EQ）的C合金分别在750℃/800℃下循环氧化100小时和750℃下等温氧化100-3000 h。采用SEM、EPMA、EBSD、EDS、XRD和TEM等手段对其微观结构演化和氧化行为进行了表征。结果表明，在循环氧化过程中，两种微观结构的氧化动力学近似遵循近线性规律。表面氧化产物主要由金红石和α-Al2O3的混合物组成，并伴有少量的TiNxOy （fcc）和α-Mn2O3。与NL微观结构相比，EQ微观结构的抗氧化性能略好于NL微观结构，两者都形成完整的氧化层，没有开裂或剥落。过渡层主要由Laves相和少量βo相组成。值得注意的是，在长期等温氧化条件下，与EQ结构相比，NL结构的抗氧化能力显著增强。NL结构中靠近氧化层的相变产生了一个由（βo+γ+Laves）相组成的扩散区。这种转变有利于形成致密且结构一致的过渡层，βo相含量降低，有效抑制Mn向外扩散，显著提高抗氧化性。相反，EQ组织在氧化层附近没有明显的相变。过渡层中存在大量的βo相，破坏了结构的完整性，导致氧化性能较差。

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引用次数: 0

Thermal expansion mismatch-induced in situ self-assembly design of gradient coatings: 1700 ℃ oxidation protection and oxygen barrier enhancement mechanism of borosilicate-modified ZrB2-MoSi2-BSG gradient composite coatings 热膨胀错配诱导的梯度涂层原位自组装设计：硼硅酸盐改性ZrB2-MoSi2-BSG梯度复合涂层1700℃氧化防护及氧障增强机理

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

Corrosion Science

Pub Date : 2025-12-26 DOI: 10.1016/j.corsci.2025.113581

Xiang Ji , Jun Zhao , Xuanru Ren , Zhichao Shang , Chengshan Ji , Peipei Wang , Yi Sun , Philipp V. Kiryukhantsev-Korneev , Evgeny A. Levashov , Xueqin Kang , Baojing Zhang , Ping Zhang , Xiaohong Wang , Junfei Peng , Junfeng Wang , Leihua Xu , Peizhong Feng

To enhance the high-temperature oxidation resistance of carbon-based materials through optimized ceramic coating structures, a borosilicate glass (BSG)-modified ZrB₂-MoSi₂-BSG gradient composite coating was successfully fabricated via in-situ self-assembly induced by thermal expansion mismatch. The influence of densification temperature on the oxygen-blocking microstructure and oxidation resistance of the composite coating was systematically investigated. Results indicate that when the densification temperature exceeds 1300 ℃, a gradient oxygen-blocking structure is formed via self-assembly during high-temperature oxidation protection. With increasing densification temperature, the interfacial bonding strength between the coating and the substrate initially increases and then decreases, reaching an optimum performance at a specific temperature. The maximum bonding strength achieved was 84.6 N, accompanied by a minimal oxidation weight gain of 0.24 × 10⁻² g·cm⁻² after 100 min at 1700 ℃. Additionally, the oxygen transmission rate was as low as 0.04 %, the carbon loss rate was 0.13 × 10⁻⁶ g·cm⁻²·s⁻¹, and the cumulative protection efficiency reached 99.95 %. However, further increasing the sintering temperature leads to excessive accumulation of self-assembled SiO₂ layers at the coating interface, resulting in structural defects such as pores and cracks within the coating. These defects provide pathways for oxygen permeation, thereby degrading the oxidation resistance of the coating. This study demonstrates that thermal expansion mismatch can be effectively utilized to induce gradient in-situ self-assembly in BSG-modified ZrB₂-MoSi₂ composite coatings, enabling effective regulation of glass phase distribution and interfacial structure through optimized sintering temperatures. This approach provides a viable strategy for the controllable structural design and highly efficient oxygen-blocking protection of ultra-high temperature ceramic coatings.

为了通过优化陶瓷涂层结构来提高碳基材料的高温抗氧化性，通过热膨胀失配诱导的原位自组装，成功制备了硼硅酸盐玻璃（BSG）修饰的ZrB2-MoSi2-BSG梯度复合涂层。系统地研究了致密化温度对复合涂层阻氧组织和抗氧化性能的影响。结果表明，当致密化温度超过1300℃时，高温氧化保护过程中通过自组装形成梯度阻氧结构。随着致密化温度的升高，涂层与基体之间的界面结合强度先增大后减小，在特定温度下达到最佳性能。在1700℃下，经过100 min后，得到的最大结合强度为84.6 N，氧化质量增加最小，为0.24 × 10−2 g·cm−2。氧气透过率低至0.04 %，碳损失率为0.13 × 10−6 g·cm−2·s−1，累计保护效率达99.95 %。然而，进一步提高烧结温度会导致自组装SiO2层在涂层界面处过度堆积，导致涂层内部出现气孔、裂纹等结构缺陷。这些缺陷为氧渗透提供了途径，从而降低了涂层的抗氧化性。本研究表明，热膨胀失配可以有效地诱导bsg改性ZrB2-MoSi2复合涂层的梯度原位自组装，通过优化烧结温度可以有效地调节玻璃相分布和界面结构。该方法为超高温陶瓷涂层的可控结构设计和高效阻氧保护提供了可行的策略。

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引用次数: 0

Distinct corrosion behaviors and mechanisms of Pt/Ti anodes in molten carbonates induced by Cl- and F- impurities Cl-和F-杂质诱导的熔融碳酸盐中Pt/Ti阳极的不同腐蚀行为和机理

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

Corrosion Science

Pub Date : 2025-12-26 DOI: 10.1016/j.corsci.2025.113580

Lei Guo , Kaifa Du , Xiang Chen , Wenmiao Li , Di Chen , Jinhang Fan , Yiqun Xiao , Huayi Yin , Dihua Wang

The halide impurities are unavoidable in the industrial scenarios of molten salt CO₂ capture and electro-transformation technology (MSCC-ET), but their effects on anode corrosion are insufficiently studied. Herein, the corrosion behavior of Pt/Ti anodes in molten carbonate containing various concentration of Cl^-/F^- was investigated. The corresponding corrosion mechanisms are analyzed and compared. The Cl^--induced platinum coating dissolution accelerated the titanium substrate passivation, thus causing more extensive performance degradation and reducing service life of Pt/Ti anodes. However, F^- affects the stability of Pt/Ti anodes in a quite different way, penetrating into the platinum coating and attacking the titanium oxide interlayer. Once above the critical F^- concentration, devastating fluorination reactions take place, followed by severe coating bulging and spallation. This work provides crucial insights into the protection and optimization of Pt/Ti anodes for further development in practical implementation.

在熔盐CO2捕集与电转化技术（MSCC-ET）的工业场景中，卤化物杂质是不可避免的，但其对阳极腐蚀的影响研究尚不充分。本文研究了Pt/Ti阳极在含不同浓度Cl-/F-的熔融碳酸盐中的腐蚀行为。对相应的腐蚀机理进行了分析和比较。Cl诱导的铂涂层溶解加速了钛衬底的钝化，从而导致更广泛的性能下降，降低了Pt/Ti阳极的使用寿命。而F-则以完全不同的方式影响Pt/Ti阳极的稳定性，渗透到铂镀层中并攻击氧化钛中间层。一旦超过临界氟浓度，就会发生破坏性的氟化反应，接着是严重的涂层膨胀和剥落。这项工作为Pt/Ti阳极的保护和优化提供了重要的见解，有助于在实际实施中进一步发展。

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引用次数: 0

Effect of zinc injection on the oxide film structure and corrosion release behavior of Alloy 690TT in high temperature pressurized water 注锌对690TT合金氧化膜结构及高温加压水中腐蚀释放行为的影响

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

Corrosion Science

Pub Date : 2025-12-24 DOI: 10.1016/j.corsci.2025.113577

Bin Wu , Xiaotian Wei , Hongliang Ming , Yichen Bao , Fanjiang Meng , Peifeng Han , Jianqiu Wang , En-Hou Han

To elucidate the inhibition mechanism of zinc water chemistry on the corrosion product release from key materials in pressurized water reactor (PWR), this study systematically investigates the evolution of oxide films and the release kinetics of elements (Ni, Cr, Fe) from Alloy 690TT under both basic (Zn-free) and zinc-injected (50 ppb) conditions in simulated primary water at 325 °C for up to 3336 h. Oxide film analysis reveals that zinc injection promotes the transformation of the outer oxide layer from a porous, needle-like NiCr₂O₄ spinel to a dense, granular (Zn,Cr,Fe)₃O₄ composite spinel, while the inner compact Cr₂O₃ layer remains stable. Analysis of the release kinetics shows that zinc injection significantly reduces the corrosion release rates of the main metallic elements. Nickel is the primary released element, and its initial release rate is reduced by approximately 71 % with zinc injection. Furthermore, based on the corrosion release rate data from various time points, a quantitative predictive model describing the evolution of the average release rates of Ni, Cr, and Fe over time has been established.

为了阐明锌水化学对压水堆（PWR）中关键材料腐蚀产物释放的抑制机制，本研究系统地研究了690TT合金在碱性（无锌）和注入锌（50 ppb）条件下氧化膜的演变和元素（Ni, Cr, Fe）在325℃、3336 h的模拟一次水中的释放动力学。氧化膜分析表明，锌的注入促进了外层氧化层从多孔的针状NiCr₂O₄尖晶石转变为致密的粒状（Zn,Cr,Fe）₃O₄复合尖晶石，而内部致密的Cr₂O₃尖晶石层保持稳定。释放动力学分析表明，注锌显著降低了主要金属元素的腐蚀释放速率。镍是主要的释放元素，注射锌后镍的初始释放速率降低了约71% %。此外，基于不同时间点的腐蚀释放速率数据，建立了描述Ni、Cr和Fe平均释放速率随时间变化的定量预测模型。

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引用次数: 0

The effects of dislocation density and configuration, and grain boundary properties on hydrogen induced stress cracking of conventionally processed and additively manufactured Inconel 625 位错密度、构形和晶界性能对常规加工和增材制造Inconel 625氢致应力开裂的影响

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

Corrosion Science

Pub Date : 2025-12-24 DOI: 10.1016/j.corsci.2025.113552

Alex Kovacs , Mobin Salasi , Zakaria Quadir , Christopher Hutchinson , Thaneshan Sapanathan

This study examined the hydrogen embrittlement properties of both conventional and additively manufactured (AM) Nickel Alloy 625. The conventional Nickel Alloy 625 samples were prepared to contain altered grain boundary properties and dislocation densities and were evaluated in relation to AM 625 specimens which displayed distinct dislocation configurations and columnar grain structures. Step loading and slow strain-rate tensile tests with hydrogen charging, fractography, crack analysis and hydrogen desorption tests were performed to determine the hydrogen effects in the wrought material in “as received”, “annealed” and “annealed & pre-strained” conditions and AM 625. The hydrogen embrittlement resistance of as-received wrought 625 (W625) and annealed (ANN) wrought 625 (ANN W625) showed no comparative difference between their hydrogen charged condition and their baseline uncharged Fast Fracture Strength (FFS) tests, both failing at 12 incremental steps despite the removal of grain boundary precipitates and the larger grain size in the annealed condition. Annealed & pre-strained wrought (ANN W625_S), with similar flow stress and dislocation density as AM 625, showed an increased HE resistance compared to W625 and ANN W625 which was attributed to a reduction in the mobile hydrogen due to trapping at the random dislocation arrangement. W625, ANN W625, and AM 625 showed higher mobile hydrogen concentrations through hydrogen desorption tests, however the AM 625 material still maintained a higher threshold stress and higher ductility compared to W625 and ANN W625. This work suggests that the dislocation density and arrangement are important contributors to the increase in hydrogen embrittlement resistance of AM 625 compared to W625 and ANN W625, which is supported by the fractography and crack analysis.

研究了常规和增材制造（AM）镍合金625的氢脆性能。常规镍合金625样品的晶界性能和位错密度发生了变化，并与am625样品进行了比较，后者显示出明显的位错配置和柱状晶粒结构。通过加氢加载和慢应变速率拉伸试验、断口分析、裂纹分析和氢解吸试验，确定了在“接收”、“退火”和“退火&预应变”条件下变形材料和am625中的氢效应。在充氢条件和基准不充氢快速断裂强度（FFS）试验中，接收态变形625 （W625）和退火态（ANN）变形625 （ANN W625）的抗氢脆性能没有比较差异，尽管在退火条件下晶界析出物去除和晶粒尺寸增大，但在12个增量步骤中均失败。退火预应变变形（ANN W625_S）具有与am625相似的流动应力和位错密度，与W625和ANN W625相比，显示出更高的HE阻力，这是由于在随机位错排列处捕获可移动氢的减少。通过氢解吸试验，W625、ANN W625和AM 625表现出更高的流动氢浓度，但与W625和ANN W625相比，AM 625材料仍保持更高的阈值应力和更高的延展性。研究表明，与W625和ANN W625相比，位错密度和排列是AM 625抗氢脆性能提高的重要原因，断口分析和裂纹分析也支持了这一结论。

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引用次数: 0

Predicting, interpreting and optimizing water resistance in epoxy/amine coatings via machine learning and NSGA-Ⅱ framework 通过机器学习和NSGA-Ⅱ框架预测、解释和优化环氧/胺涂层的耐水性

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

Corrosion Science

Pub Date : 2025-12-24 DOI: 10.1016/j.corsci.2025.113568

Fengda Pan , Yu Cui , Fuhui Wang , Li Liu

Achieving excellent water resistance with low diffusion coefficient (D) and saturated water absorption ratio (W) is crucial and ideal for developing long-lasting organic anti-corrosion coatings, especially in ocean applications. However, the traditional ways to develop organic anti-corrosion coatings mainly rely on repetitive experiments. Here, this study proposes a hybrid approach combining machine learning (ML) techniques with prior knowledge on coatings to rapidly design and accurately predict the water resistance of different coatings’ formula. D and W data of epoxy/amine coatings are collected, and then two feature construction strategies (Ⅰ and Ⅱ) are proposed. The strategy Ⅱ incorporating the physicochemical features of the coatings demonstrates high prediction accuracy, with the R² values of the D and W datasets increasing by 31 % and 24 %, respectively. Integrating Shapley Additive Explanations analysis (SHAP) into machine learning models determine each feature’s contribution to water resistance performance, offering a systematic understanding of the composition-processing-performance relationship. The non-dominated sorting genetic algorithm (NSGA-II) generated a Pareto optimal solution set for D and W, guiding the optimization of coatings with water resistance properties. The coatings’ formula with the water resistance from the optimal set using the entropy weight method are selected for experimental preparation, with average errors of 14.22 % (D) and 12.02 % (W), respectively. This established ML strategy with prior expert knowledge on coating failure has excellent reliability in the prediction of water resistance of coating, and provides a versatile framework for designing highly corrosion-resistant and durable organic anti-corrosion coatings.

实现低扩散系数(D)和饱和吸水率(W)的优异耐水性对于开发持久的有机防腐涂料至关重要，特别是在海洋应用中。然而，传统的有机防腐涂料开发方法主要依赖于重复实验。在这里，本研究提出了一种混合方法，将机器学习（ML）技术与涂料的先验知识相结合，以快速设计和准确预测不同涂料配方的耐水性。收集环氧/胺类涂料的D和W数据，提出两种特征构建策略（Ⅰ和Ⅱ）。结合涂层物理化学特征的策略Ⅱ显示出较高的预测精度，D和W数据集的R²值分别提高了31% %和24% %。将Shapley加性解释分析（SHAP）集成到机器学习模型中，确定每个特征对防水性能的贡献，从而系统地了解成分-处理-性能关系。非支配排序遗传算法（NSGA-II）生成D和W的Pareto最优解集，指导耐水性涂料的优化。采用熵权法选取最优集的耐水性涂料配方进行实验制备，平均误差分别为14.22 % (D)和12.02 % (W)。基于先验的涂层失效专家知识建立的ML策略在预测涂层耐水性方面具有优异的可靠性，为设计高耐腐蚀和耐用的有机防腐涂层提供了一个通用的框架。

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引用次数: 0

Experimental and multi-scale simulation evaluation of nanoclay/nanosilica epoxy coatings for enhanced corrosion protection of structural steel 纳米粘土/纳米二氧化硅环氧涂层增强结构钢防腐性能的实验与多尺度模拟评价

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

Corrosion Science

Pub Date : 2025-12-23 DOI: 10.1016/j.corsci.2025.113574

Zahoor Hussain , Xingyu Wang , Iram Riaz , Zhibin Lin , Wenjian Nie , Yizhou Lin , Chengcheng Tao , Ying Huang

This work investigates the corrosion protection mechanisms of epoxy coatings reinforced with two types of nanoparticles: nanoclay (layered platelets) and nanosilica (spherical particles). Coatings with varying nanofiller concentrations were evaluated by electrochemical impedance spectroscopy (EIS) and salt spray testing, supported by microstructural and mechanical characterization. The incorporation of 1.5 %-2 % nanoclay/nanosilica yielded the highest impedance response (2.28 × 10⁶ Ω·cm²), while coatings containing 2 % nanofillers exhibited minimal chloride and iron penetration after salt spray exposure, as confirmed by SEM-EDS. Nanoparticle addition also refined the coating microstructure by reducing pore size (0.034 mm) and porosity (0.03 %), thereby enhancing barrier performance. Abrasion resistance improved substantially, with nanofiller-modified coatings showing up to 68 % lower mass loss than pure epoxy after 1000 cycles. Complementary molecular dynamics simulations revealed that nanoparticle incorporation restricted polymer chain mobility and enhanced matrix stiffness, whereas finite element modeling demonstrated improved damage tolerance under abrasion. Notably, nanosilica provided a broader interaction range (95–105 Å) compared to nanoclay (25–35 Å), contributing to the long-term stability of the passive barrier. These findings establish a multi-scale understanding of how hybrid nanofillers improve epoxy coating corrosion resistance and durability, offering design guidelines for advanced protective systems in structural and industrial applications.

本研究研究了两种纳米颗粒增强环氧涂层的防腐机制：纳米粘土（层状片状）和纳米二氧化硅（球形颗粒）。通过电化学阻抗谱（EIS）和盐雾测试对不同纳米填料浓度的涂层进行了评价，并进行了微观结构和力学表征。SEM-EDS证实，掺入1.5 %-2 %纳米粘土/纳米二氧化硅的涂层产生了最高的阻抗响应（2.28 × 10⁶Ω·cm²），而含有2 %纳米填料的涂层在盐雾暴露后表现出最小的氯化物和铁渗透。纳米颗粒的加入还可以通过减小孔径（0.034 mm）和孔隙率（0.03 %）来改善涂层的微观结构，从而提高阻隔性能。耐磨性大大提高，纳米填料改性涂层在1000次循环后的质量损失比纯环氧树脂低68% %。互补的分子动力学模拟表明，纳米颗粒的掺入限制了聚合物链的迁移性，增强了基体的刚度，而有限元模型表明，纳米颗粒的掺入改善了磨损下的损伤容忍度。值得注意的是，与纳米粘土（25-35 Å）相比，纳米二氧化硅提供了更广泛的相互作用范围（95-105 Å），有助于被动屏障的长期稳定性。这些发现建立了对混合纳米填料如何提高环氧涂层耐腐蚀性和耐久性的多尺度理解，为结构和工业应用中的先进保护系统提供了设计指南。

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引用次数: 0