Pub Date : 2026-01-15DOI: 10.1016/j.corsci.2026.113632
Ziyu Li , Dawei Guo , Hongchang Qian , Dawei Zhang , Zhongyu Wu , Qian Qiao , Lap Mou Tam , Chi Tat Kwok
This study investigated the early-stage corrosion behavior of additive friction stir deposition (AFSD)-fabricated AA2024. The AFSD process reduced the grain size and the degree of particle clustering, fragmented the large constituent particles, and promoted the coarsening of the precipitate S-phase. Isolated and clustered particles presented distinct corrosion behavior. Isolated particles experienced localized attack at and around active particles, and a greater corrosion product coverage was found in AFSD made samples since the coarsening of precipitate S-phase provided extra active sites. Rings of corrosion products, typical features of stable pitting corrosion, were both observed on the feedstock and AFSD made alloys. However, stable pitting corrosion was less severe on AFSD fabricated specimen due to the weakening particle clustering.
{"title":"Corrosion behavior of AA2024 aluminum alloy manufactured by solid state additive manufacturing – Additive friction stir deposition","authors":"Ziyu Li , Dawei Guo , Hongchang Qian , Dawei Zhang , Zhongyu Wu , Qian Qiao , Lap Mou Tam , Chi Tat Kwok","doi":"10.1016/j.corsci.2026.113632","DOIUrl":"10.1016/j.corsci.2026.113632","url":null,"abstract":"<div><div>This study investigated the early-stage corrosion behavior of additive friction stir deposition (AFSD)-fabricated AA2024. The AFSD process reduced the grain size and the degree of particle clustering, fragmented the large constituent particles, and promoted the coarsening of the precipitate S-phase. Isolated and clustered particles presented distinct corrosion behavior. Isolated particles experienced localized attack at and around active particles, and a greater corrosion product coverage was found in AFSD made samples since the coarsening of precipitate S-phase provided extra active sites. Rings of corrosion products, typical features of stable pitting corrosion, were both observed on the feedstock and AFSD made alloys. However, stable pitting corrosion was less severe on AFSD fabricated specimen due to the weakening particle clustering.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"262 ","pages":"Article 113632"},"PeriodicalIF":7.4,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146006610","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}
Pub Date : 2026-01-15DOI: 10.1016/j.corsci.2026.113634
Ni Ao , Songquan Tang , Xu Zhang , Yanan Fu , Shengchuan Wu
Visual observation of the entire life cycle during corrosion fatigue loading for Al alloys provides valuable insights into the underlying damage mechanisms. In this study, the full-field spatial-temporal evolution of corrosion fatigue, encompassing corrosion pit initiation, pit growth, pit-to-crack transition, crack growth and final fracture, is recorded by in situ synchrotron X-ray tomography. By integrating microstructural characterizations, this work offers a novel perspective on the corrosion fatigue damage mechanism of Al alloys. The geometrical morphology of corrosion pits strongly governs their subsequent evolution. Some corrosion pits own regular and uniform morphologies, while others, which ultimately become fatal pits, develop complex geometrical shapes due to interactions with constituent particles and voids in the material interior. The pit-to-crack transition is characterized by a repetitive process of crack tip growth followed by preferential dissolution of the sharp tip at the bottom of the pits. During the corrosion fatigue crack growth stage, a significant number of hydrogen bubbles are observed between crack surfaces, confirming the hybrid damage mechanism of hydrogen embrittlement (HE) and anodic dissolution (AD). The observed “growth-blunting-growth” behavior of the crack tip indicates that the corrosion fatigue crack growth rate is determined by a balance between the accelerating effects of HE and AD and the decelerating effect of AD-induced tip blunting.
{"title":"4D evolution of corrosion fatigue crack initiation and growth behavior in high-strength Al alloy by in situ synchrotron X-ray tomography","authors":"Ni Ao , Songquan Tang , Xu Zhang , Yanan Fu , Shengchuan Wu","doi":"10.1016/j.corsci.2026.113634","DOIUrl":"10.1016/j.corsci.2026.113634","url":null,"abstract":"<div><div>Visual observation of the entire life cycle during corrosion fatigue loading for Al alloys provides valuable insights into the underlying damage mechanisms. In this study, the full-field spatial-temporal evolution of corrosion fatigue, encompassing corrosion pit initiation, pit growth, pit-to-crack transition, crack growth and final fracture, is recorded by <em>in situ</em> synchrotron X-ray tomography. By integrating microstructural characterizations, this work offers a novel perspective on the corrosion fatigue damage mechanism of Al alloys. The geometrical morphology of corrosion pits strongly governs their subsequent evolution. Some corrosion pits own regular and uniform morphologies, while others, which ultimately become fatal pits, develop complex geometrical shapes due to interactions with constituent particles and voids in the material interior. The pit-to-crack transition is characterized by a repetitive process of crack tip growth followed by preferential dissolution of the sharp tip at the bottom of the pits. During the corrosion fatigue crack growth stage, a significant number of hydrogen bubbles are observed between crack surfaces, confirming the hybrid damage mechanism of hydrogen embrittlement (HE) and anodic dissolution (AD). The observed “growth-blunting-growth” behavior of the crack tip indicates that the corrosion fatigue crack growth rate is determined by a balance between the accelerating effects of HE and AD and the decelerating effect of AD-induced tip blunting.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"262 ","pages":"Article 113634"},"PeriodicalIF":7.4,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075765","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}
Pub Date : 2026-01-15DOI: 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.
{"title":"The mechanism of microbiologically induced stress corrosion cracking of X80 steel under different Desulfovibrio vulgaris biofilm distributions","authors":"Zhong Li , Yuzhou Chen , Xiaolong Li , Xiaohu Zhang , Zhiyong Liu , Hongchi ma , Jiaxing Cai , Yi Fan , Daiwei Guo , Zehua Li , Xiaogang Li , Jike Yang","doi":"10.1016/j.corsci.2026.113633","DOIUrl":"10.1016/j.corsci.2026.113633","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"262 ","pages":"Article 113633"},"PeriodicalIF":7.4,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036903","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}
Pub Date : 2026-01-15DOI: 10.1016/j.corsci.2026.113629
Vincenzo Bongiorno , Niek Hijnen , Xiaorong Zhou
Large Language Models (LLMs) were applied to automate the interpretation of electrochemical impedance spectroscopy (EIS) data, enabling classification and parameter estimation without the need for a task specific machine learning training. The approach achieved classification accuracies up to 96 % and produced fitting results comparable to those obtained with specifically trained neural networks. The methodology reduces reliance on labelled data and manual intervention. While demonstrated in the context of organic coatings, the framework provides a scalable AI-based workflow that could, in principle, be extended to conceptually similar tasks in materials and corrosion research, subject to dedicated validation.
{"title":"Exploring the use of large language models for EIS: A feasibility study on organic coatings for corrosion protection","authors":"Vincenzo Bongiorno , Niek Hijnen , Xiaorong Zhou","doi":"10.1016/j.corsci.2026.113629","DOIUrl":"10.1016/j.corsci.2026.113629","url":null,"abstract":"<div><div>Large Language Models (LLMs) were applied to automate the interpretation of electrochemical impedance spectroscopy (EIS) data, enabling classification and parameter estimation without the need for a task specific machine learning training. The approach achieved classification accuracies up to 96 % and produced fitting results comparable to those obtained with specifically trained neural networks. The methodology reduces reliance on labelled data and manual intervention. While demonstrated in the context of organic coatings, the framework provides a scalable AI-based workflow that could, in principle, be extended to conceptually similar tasks in materials and corrosion research, subject to dedicated validation.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"261 ","pages":"Article 113629"},"PeriodicalIF":7.4,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023973","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}
Pub Date : 2026-01-14DOI: 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.
{"title":"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","authors":"Zinuo Wang, Peng Zhou, Tao Zhang, Fuhui Wang","doi":"10.1016/j.corsci.2026.113628","DOIUrl":"10.1016/j.corsci.2026.113628","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"262 ","pages":"Article 113628"},"PeriodicalIF":7.4,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037492","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}
Pub Date : 2026-01-12DOI: 10.1016/j.corsci.2026.113626
Anton Kokalj
In a recent study (Kokalj, 2026), a model was developed to map multilayer surface coverage to inhibition efficiency (). In that model, the corrosion protectiveness of adsorbed molecular layers beyond the first was postulated to follow a Langmuir-like dependence on the number of layers. In the present work, this model is generalized by leveraging an experimental observation that the polarization resistance of Langmuir–Blodgett monolayers increases linearly with the number of deposited monolayers beyond the first. It is shown that the previously developed model is a special case of the more general formulation presented here. Both models predict a characteristic hallmark shape in the versus plot — where is the inhibitor concentration — featuring a bent, arching profile above the line at low concentrations, followed by a linear regime at higher concentrations. The generalized model, however, provides further insight, indicating that the extent of this curvature increases when the contribution of the subsequent layers to inhibition efficiency is strong, or when the first adsorbed layer contributes weakly, a behavior that is consistently reproduced when the model is applied to experimental inhibition efficiency data from the literature. Yet under many conditions, the curvature remains too subtle to allow unambiguous identification of multilayer adsorption based on versus plots alone.
{"title":"A generalized model of corrosion inhibition efficiency for multilayer adsorption","authors":"Anton Kokalj","doi":"10.1016/j.corsci.2026.113626","DOIUrl":"10.1016/j.corsci.2026.113626","url":null,"abstract":"<div><div>In a recent study (Kokalj, 2026), a model was developed to map multilayer surface coverage to inhibition efficiency (<span><math><mi>η</mi></math></span>). In that model, the corrosion protectiveness of adsorbed molecular layers beyond the first was postulated to follow a Langmuir-like dependence on the number of layers. In the present work, this model is generalized by leveraging an experimental observation that the polarization resistance of Langmuir–Blodgett monolayers increases linearly with the number of deposited monolayers beyond the first. It is shown that the previously developed model is a special case of the more general formulation presented here. Both models predict a characteristic hallmark shape in the <span><math><mrow><mi>c</mi><mo>/</mo><mi>η</mi></mrow></math></span> versus <span><math><mi>c</mi></math></span> plot — where <span><math><mi>c</mi></math></span> is the inhibitor concentration — featuring a bent, arching profile above the <span><math><mrow><mi>c</mi><mo>/</mo><mi>η</mi><mo>=</mo><mi>c</mi></mrow></math></span> line at low concentrations, followed by a linear regime at higher concentrations. The generalized model, however, provides further insight, indicating that the extent of this curvature increases when the contribution of the subsequent layers to inhibition efficiency is strong, or when the first adsorbed layer contributes weakly, a behavior that is consistently reproduced when the model is applied to experimental inhibition efficiency data from the literature. Yet under many conditions, the curvature remains too subtle to allow unambiguous identification of multilayer adsorption based on <span><math><mrow><mi>c</mi><mo>/</mo><mi>η</mi></mrow></math></span> versus <span><math><mi>c</mi></math></span> plots alone.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"261 ","pages":"Article 113626"},"PeriodicalIF":7.4,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023896","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}
Pub Date : 2026-01-12DOI: 10.1016/j.corsci.2026.113627
Xiaohong Chen, Taoqiang Ling, Danchu Wang, Dan Zhou, Pengcheng Zhou, Wenpo Li
The porous, loose rust layer on bronze artifacts induces continuous corrosion of the bronze substrate, ultimately causing perforation and pulverization. Conventional sealing methods have limitations like poor aging resistance, environmental harm, and damage to artifacts’ original appearance, creating an urgent need for environmentally benign, long-lasting, non-destructive sealing materials. In this work, silane coupling agent (KH550) and polyaspartic acid (PASP) were hydrothermally modified to prepare corrosion inhibitor N@KH550. Via simple immersion, N@KH550 can penetrate the bronze corrosion layer to the copper matrix and self-assemble into a dense protective film. Its siloxane and carbonyl/amido-containing compounds form the dense composite film through physical adsorption (van der Waals forces, hydrogen bonds), metal ion complexation, and Si-O-Si condensation, effectively blocking corrosive media ingress. At 298 K, 30 min pre-filming yielded 94.52 % corrosion inhibition efficiency for bronze samples, showing high efficacy; even at 333 K, efficiency remained over 90 %, indicating good thermal stability. Critically, it does not affect bronze patina morphology or color, meeting cultural heritage conservation requirements. This study is expected to provide new theoretical and technical support for bronze preservation, advancing cultural heritage conservation.
{"title":"Non-destructive conservation and thermally stable self-assembled films for bronze: Evaluation of synergistic protection mechanisms","authors":"Xiaohong Chen, Taoqiang Ling, Danchu Wang, Dan Zhou, Pengcheng Zhou, Wenpo Li","doi":"10.1016/j.corsci.2026.113627","DOIUrl":"10.1016/j.corsci.2026.113627","url":null,"abstract":"<div><div>The porous, loose rust layer on bronze artifacts induces continuous corrosion of the bronze substrate, ultimately causing perforation and pulverization. Conventional sealing methods have limitations like poor aging resistance, environmental harm, and damage to artifacts’ original appearance, creating an urgent need for environmentally benign, long-lasting, non-destructive sealing materials. In this work, silane coupling agent (KH550) and polyaspartic acid (PASP) were hydrothermally modified to prepare corrosion inhibitor N@KH550. Via simple immersion, N@KH550 can penetrate the bronze corrosion layer to the copper matrix and self-assemble into a dense protective film. Its siloxane and carbonyl/amido-containing compounds form the dense composite film through physical adsorption (van der Waals forces, hydrogen bonds), metal ion complexation, and Si-O-Si condensation, effectively blocking corrosive media ingress. At 298 K, 30 min pre-filming yielded 94.52 % corrosion inhibition efficiency for bronze samples, showing high efficacy; even at 333 K, efficiency remained over 90 %, indicating good thermal stability. Critically, it does not affect bronze patina morphology or color, meeting cultural heritage conservation requirements. This study is expected to provide new theoretical and technical support for bronze preservation, advancing cultural heritage conservation.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"261 ","pages":"Article 113627"},"PeriodicalIF":7.4,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974633","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}
Pub Date : 2026-01-10DOI: 10.1016/j.corsci.2026.113625
Yuanxing Ning , Peixun Yang , Ming Song , Yan Wang , Yuxing Li , Cuiwei Liu , Cailin Wang
This study systematically investigates the hydrogen embrittlement (HE) behavior of X65 pipeline steel base metal (BM) and weld metal (WM) in gaseous hydrogen environments. The hydrogen permeation characteristics, fatigue properties and fracture behaviour of both the BM and WM under various hydrogen partial pressure environments were considered intensively. Electron backscatter scanning diffraction (EBSD) was employed to characterize crystallographic features of the BM and WM. The results indicate that the BM exhibits no pronounced texture and contains a low proportion of high angle grain boundaries (HAGBs). The WM shows distinct texture and possesses relatively low dislocation density. Under in-situ gaseous hydrogen charging conditions, the hydrogen diffusivity for various regions of WM are about half an order of magnitude greater than that of the BM. With the increase of hydrogen partial pressure, the correlation between partial pressure and the fatigue crack growth rate (FCGR) weakens. At the hydrogen partial pressure of 1.26 MPa, the FCGRR of WM is approximately 1.4 times that of the BM, which is more susceptible to hydrogen effects. Macroscopic and microscopic analyzes of the specimen fracture surfaces were conducted using a 3D super depth of field microscope and a scanning electron microscope (SEM). Comparing with BM specimens, WM specimens accompany more abundant brittle fracture characteristics and exhibit lower fracture toughness. Under the identical hydrogen partial pressure, the embrittlement index (EI) of BM and WM are comparable, whereas the fracture toughness of WM was approximately 37.7 % and 14.6 % lower than those of BM respectively.
{"title":"Investigation on hydrogen embrittlement behaviour of X65 steel base metal and girth weld metal under in-situ hydrogen environment","authors":"Yuanxing Ning , Peixun Yang , Ming Song , Yan Wang , Yuxing Li , Cuiwei Liu , Cailin Wang","doi":"10.1016/j.corsci.2026.113625","DOIUrl":"10.1016/j.corsci.2026.113625","url":null,"abstract":"<div><div>This study systematically investigates the hydrogen embrittlement (HE) behavior of X65 pipeline steel base metal (BM) and weld metal (WM) in gaseous hydrogen environments. The hydrogen permeation characteristics, fatigue properties and fracture behaviour of both the BM and WM under various hydrogen partial pressure environments were considered intensively. Electron backscatter scanning diffraction (EBSD) was employed to characterize crystallographic features of the BM and WM. The results indicate that the BM exhibits no pronounced texture and contains a low proportion of high angle grain boundaries (HAGBs). The WM shows distinct texture and possesses relatively low dislocation density. Under in-situ gaseous hydrogen charging conditions, the hydrogen diffusivity for various regions of WM are about half an order of magnitude greater than that of the BM. With the increase of hydrogen partial pressure, the correlation between partial pressure and the fatigue crack growth rate (FCGR) weakens. At the hydrogen partial pressure of 1.26 MPa, the FCGRR of WM is approximately 1.4 times that of the BM, which is more susceptible to hydrogen effects. Macroscopic and microscopic analyzes of the specimen fracture surfaces were conducted using a 3D super depth of field microscope and a scanning electron microscope (SEM). Comparing with BM specimens, WM specimens accompany more abundant brittle fracture characteristics and exhibit lower fracture toughness. Under the identical hydrogen partial pressure, the embrittlement index (EI) of BM and WM are comparable, whereas the fracture toughness of WM was approximately 37.7 % and 14.6 % lower than those of BM respectively.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"261 ","pages":"Article 113625"},"PeriodicalIF":7.4,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974688","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}
Pub Date : 2026-01-09DOI: 10.1016/j.corsci.2026.113624
Yuxin Lou , You Wang , Kun Zhang , Jiaqi Li , Yiheng Wu , Dongxin Gao , Yangxin Li , Hao Wang , Zhao Shen , Xiaoqin Zeng
The corrosion behavior of a FeCrNiAl dual-phase high-entropy alloy (DP-HEA) was examined in oxygen-deficient lead–bismuth eutectic (10⁻⁷ wt% O) at 500 °C for up to 3000 h. The ordered B2-NiAl phase exhibited excellent stability, while the FCC matrix underwent severe Ni dissolution, driving an FCC→Fe-rich BCC transformation with orientation inheritance. Upon cooling, dissolved elements reprecipitated sequentially as Fe–Cr intermetallics at the LBE interface, followed by Ni–Al precipitates at grain boundaries. These results establish a phase-dependent corrosion mechanism, wherein the NiAl phase acts as a stable skeleton and the FCC phase is highly susceptible to dissolution. The findings provide mechanistic insight into selective corrosion and phase evolution in DP-HEAs, offering guidance for alloy design in liquid-metal environments.
{"title":"Dissolution-driven phase transformation and precipitation in a FeCrNiAl dual-phase HEA exposed to oxygen-deficient LBE","authors":"Yuxin Lou , You Wang , Kun Zhang , Jiaqi Li , Yiheng Wu , Dongxin Gao , Yangxin Li , Hao Wang , Zhao Shen , Xiaoqin Zeng","doi":"10.1016/j.corsci.2026.113624","DOIUrl":"10.1016/j.corsci.2026.113624","url":null,"abstract":"<div><div>The corrosion behavior of a FeCrNiAl dual-phase high-entropy alloy (DP-HEA) was examined in oxygen-deficient lead–bismuth eutectic (10⁻⁷ wt% O) at 500 °C for up to 3000 h. The ordered B2-NiAl phase exhibited excellent stability, while the FCC matrix underwent severe Ni dissolution, driving an FCC→Fe-rich BCC transformation with orientation inheritance. Upon cooling, dissolved elements reprecipitated sequentially as Fe–Cr intermetallics at the LBE interface, followed by Ni–Al precipitates at grain boundaries. These results establish a phase-dependent corrosion mechanism, wherein the NiAl phase acts as a stable skeleton and the FCC phase is highly susceptible to dissolution. The findings provide mechanistic insight into selective corrosion and phase evolution in DP-HEAs, offering guidance for alloy design in liquid-metal environments.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"261 ","pages":"Article 113624"},"PeriodicalIF":7.4,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974632","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}
Pub Date : 2026-01-08DOI: 10.1016/j.corsci.2026.113608
Jinghua Tian , Linqian Wang , Bingqiang Wei , Min Zha , Xiangyang Yuan , Shenbao Jin , Fei Zhang , Zulai Li , Hui-Yuan Wang
Mg alloys prepared by wire arc additive manufacturing (WAAM) typically exhibit low corrosion resistance due to the presence of defects and microstructural inhomogeneities. In this study, laser was integrated into the WAAM process of a Mg-0.7Al-0.6Ce-0.5Mn-0.5Ca (wt%) alloy to tailor its microstructure. The influence of laser input power on alloy’s microstructural characteristics, including defect, grain size, texture and residual stress was systematically investigated. Furthermore, the resulting changes in corrosion behavior associated with these microstructural modifications were examined. The results reveal that applying a laser power of 200 W significantly reduced both defect size and grain size, which mitigated pitting corrosion and enhanced the protectiveness of the surface film. Consequently, a corrosion rate of 1.37 mm/y in 3.5 wt% NaCl solution was achieved, ∼28.6 % lower than that of the alloy prepared without laser assistance (1.92 mm/y). However, excessive laser power (e.g. 500 W) led to the formation of coarse grains with non-basal orientation and high residual stress, which preferentially corroded and initiated severe localized corrosion, increasing the corrosion rate to 2.61 mm/y. Overall, these findings demonstrate that incorporating laser heating with optimized input power is an effective strategy to enhance the corrosion resistance of WAAM-fabricated Mg alloys.
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