Pub Date : 2025-04-21DOI: 10.1016/j.corsci.2025.112961
João Victor de S. Araujo , Jinghui Chen , Isolda Costa , Xiaorong Zhou
The influence of defects formed by dissolution of constituent intermetallic particles (IMPs) on the corrosion resistance of anodized aluminium alloys, including AA2024-T3, AA2198-T8, AA2198-T851, and AA7475-T761, is investigated. Localized corrosion initiates cavity defects located at the film/alloy interface, mainly due to the dissolution of high-copper-containing IMPs. In AA2024, Si-containing particle-induced defects also contributed to a reduction in corrosion resistance. Low-copper-containing IMPs in AA7475-T761 alloy, however, do not affect corrosion resistance. The effects of particle density, composition, size, and location on the formation of defects in anodic films and, subsequently, on corrosion resistance of anodized alloys are discussed.
{"title":"Localized corrosion in anodized aluminium alloys: The role of constituent particle-induced defects in anodic films","authors":"João Victor de S. Araujo , Jinghui Chen , Isolda Costa , Xiaorong Zhou","doi":"10.1016/j.corsci.2025.112961","DOIUrl":"10.1016/j.corsci.2025.112961","url":null,"abstract":"<div><div>The influence of defects formed by dissolution of constituent intermetallic particles (IMPs) on the corrosion resistance of anodized aluminium alloys, including AA2024-T3, AA2198-T8, AA2198-T851, and AA7475-T761, is investigated. Localized corrosion initiates cavity defects located at the film/alloy interface, mainly due to the dissolution of high-copper-containing IMPs. In AA2024, Si-containing particle-induced defects also contributed to a reduction in corrosion resistance. Low-copper-containing IMPs in AA7475-T761 alloy, however, do not affect corrosion resistance. The effects of particle density, composition, size, and location on the formation of defects in anodic films and, subsequently, on corrosion resistance of anodized alloys are discussed.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112961"},"PeriodicalIF":7.4,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859013","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 : 2025-04-19DOI: 10.1016/j.corsci.2025.112962
Feng Chen , Baofei Liu , Nan Wang , Yangyang Sun , Jie Ding , Hui Chang , Lian Zhou
To investigate the corrosion behavior of high Nb-containing TiAl alloys, samples of Ti-45Al-8Nb, Ti-45Al-8Nb-0.5 wt% Fe, and Ti-45Al-8Nb-0.5 wt% Fe-2wt% TiB2 were fabricated via hot isostatic pressing (HIP). The effects of Fe micro-alloying and the combination of Fe micro-alloying with TiB2 reinforcement on the corrosion properties of TiAl alloys were explored. The results revealed that the introduction of Fe caused significant lattice distortion in the γ-TiAl phase, while the presence of TiB2 particles hindered the formation of a dense passive film on the sample surface. However, both Fe micro-alloying and TiB2 reinforcement led to a notable reduction in the size of lamellar colony and the width of lamellar layers. The surface of TiAl and TiAl-Fe samples after corrosion was affected by the layered morphology formed by the difference in corrosion resistance between TiAl and Ti3Al phases. The addition of Fe element reduced the number of corrosion pits, while TiAl-Fe-TiB2 was subjected to micro-galvanic corrosion near TiB2. The preferential corrosion area appeared, and there were flocculent and granular oxides. As a result, the corrosion current density of the sample decreased progressively from 1.42 × 10−7 A/cm2 to 1.05 × 10−7 A/cm2, and further to 9.86 × 10−8 A/cm2. Additionally, the corrosion potential exhibited an anodic shift, increasing from −0.27 V to −0.11 V, and further to −0.09 V, indicating a significant enhancement in the corrosion resistance of the material. This combined effect of lattice distortion and grain refinement was found to impede the diffusion of Cl- ions, significantly enhancing the formation rate of the passive film.
为了研究高含 Nb TiAl 合金的腐蚀行为，通过热等静压（HIP）制造了 Ti-45Al-8Nb、Ti-45Al-8Nb-0.5 wt% Fe 和 Ti-45Al-8Nb-0.5 wt% Fe-2wt% TiB2 样品。探讨了铁微合金化以及铁微合金化与 TiB2 增强相结合对 TiAl 合金腐蚀性能的影响。结果表明，铁的引入会导致γ-TiAl 相发生明显的晶格畸变，而 TiB2 颗粒的存在则会阻碍在样品表面形成致密的被动膜。然而，铁微合金化和 TiB2 增强都导致片状菌落的尺寸和片状层的宽度明显减小。腐蚀后的 TiAl 和 TiAl-Fe 样品表面受到 TiAl 和 Ti3Al 相耐腐蚀性差异所形成的层状形态的影响。铁元素的加入减少了腐蚀坑的数量，而 TiAl-Fe-TiB2 则在 TiB2 附近受到微电化学腐蚀。出现了优先腐蚀区，并出现了絮状和颗粒状氧化物。因此，样品的腐蚀电流密度从 1.42 × 10-7 A/cm2逐渐下降到 1.05 × 10-7 A/cm2，并进一步下降到 9.86 × 10-8 A/cm2。此外，腐蚀电位也出现了阳极移动，从-0.27 V 上升到-0.11 V，再进一步上升到-0.09 V，这表明材料的耐腐蚀性显著增强。晶格畸变和晶粒细化的共同作用阻碍了 Cl- 离子的扩散，显著提高了被动膜的形成速度。
{"title":"Influence of Fe micro-alloying and TiB2 reinforcement on the corrosion behavior of high Nb-containing TiAl alloys","authors":"Feng Chen , Baofei Liu , Nan Wang , Yangyang Sun , Jie Ding , Hui Chang , Lian Zhou","doi":"10.1016/j.corsci.2025.112962","DOIUrl":"10.1016/j.corsci.2025.112962","url":null,"abstract":"<div><div>To investigate the corrosion behavior of high Nb-containing TiAl alloys, samples of Ti-45Al-8Nb, Ti-45Al-8Nb-0.5 wt% Fe, and Ti-45Al-8Nb-0.5 wt% Fe-2wt% TiB<sub>2</sub> were fabricated via hot isostatic pressing (HIP). The effects of Fe micro-alloying and the combination of Fe micro-alloying with TiB<sub>2</sub> reinforcement on the corrosion properties of TiAl alloys were explored. The results revealed that the introduction of Fe caused significant lattice distortion in the γ-TiAl phase, while the presence of TiB<sub>2</sub> particles hindered the formation of a dense passive film on the sample surface. However, both Fe micro-alloying and TiB<sub>2</sub> reinforcement led to a notable reduction in the size of lamellar colony and the width of lamellar layers. The surface of TiAl and TiAl-Fe samples after corrosion was affected by the layered morphology formed by the difference in corrosion resistance between TiAl and Ti<sub>3</sub>Al phases. The addition of Fe element reduced the number of corrosion pits, while TiAl-Fe-TiB<sub>2</sub> was subjected to micro-galvanic corrosion near TiB<sub>2</sub>. The preferential corrosion area appeared, and there were flocculent and granular oxides. As a result, the corrosion current density of the sample decreased progressively from 1.42 × 10<sup>−7</sup> A/cm<sup>2</sup> to 1.05 × 10<sup>−7</sup> A/cm<sup>2</sup>, and further to 9.86 × 10<sup>−8</sup> A/cm<sup>2</sup>. Additionally, the corrosion potential exhibited an anodic shift, increasing from −0.27 V to −0.11 V, and further to −0.09 V, indicating a significant enhancement in the corrosion resistance of the material. This combined effect of lattice distortion and grain refinement was found to impede the diffusion of Cl<sup>-</sup> ions, significantly enhancing the formation rate of the passive film.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112962"},"PeriodicalIF":7.4,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851656","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 : 2025-04-18DOI: 10.1016/j.corsci.2025.112959
Hai Tang , Chengpu Li , Meng Xu , Liangliang Lv , Chen Sun , Baihui Xing , Shimin Qu , Zhengli Hua
Fatigue life evaluation of welded joints is essential for structural integrity management in hydrogen-mixed natural gas pipelines. In this study, the fatigue crack growth rate (FCGR) of X80 welded joints was examined in simulated natural gas environments under 12 MPa with hydrogen volume fractions of 0, 10, and 30 %. The experimental results demonstrate that the hydrogen-induced FCGR curve in double logarithmic coordinates exhibits non-linear behavior, comprised of transition and acceleration regimes. The FCGR in different regions of the welded joint ranks from high to low as follows: heat affected zone (HAZ), base metal (BM), and weld metal (WM). The WM exhibits superior hydrogen embrittlement (HE) resistance owing to high density of fine acicular ferrite (AF) microstructure, whereas the HAZ displays the highest HE susceptibility associated with bainitic structures and hard, brittle secondary phases. Based on experimental results, a finite element method was proposed to simulate cross-region fatigue crack growth in welded joints under hydrogen environments, explicitly incorporating region-specific variations in FCGRs across distinct zones of the weldment. The simulation results indicate that the semi-elliptical crack propagates from the WM through the HAZ to the BM, with its morphology transitioning from semi-ellipse to valley shape and then to semi-circle as fatigue cycles increase, resulting in stress concentration at the crack front of the WM zone.
{"title":"Fatigue crack growth behavior of X80 pipeline girth welded joints in natural gas/mixed hydrogen environment: Experimental and numerical investigations","authors":"Hai Tang , Chengpu Li , Meng Xu , Liangliang Lv , Chen Sun , Baihui Xing , Shimin Qu , Zhengli Hua","doi":"10.1016/j.corsci.2025.112959","DOIUrl":"10.1016/j.corsci.2025.112959","url":null,"abstract":"<div><div>Fatigue life evaluation of welded joints is essential for structural integrity management in hydrogen-mixed natural gas pipelines. In this study, the fatigue crack growth rate (FCGR) of X80 welded joints was examined in simulated natural gas environments under 12 MPa with hydrogen volume fractions of 0, 10, and 30 %. The experimental results demonstrate that the hydrogen-induced FCGR curve in double logarithmic coordinates exhibits non-linear behavior, comprised of transition and acceleration regimes. The FCGR in different regions of the welded joint ranks from high to low as follows: heat affected zone (HAZ), base metal (BM), and weld metal (WM). The WM exhibits superior hydrogen embrittlement (HE) resistance owing to high density of fine acicular ferrite (AF) microstructure, whereas the HAZ displays the highest HE susceptibility associated with bainitic structures and hard, brittle secondary phases. Based on experimental results, a finite element method was proposed to simulate cross-region fatigue crack growth in welded joints under hydrogen environments, explicitly incorporating region-specific variations in FCGRs across distinct zones of the weldment. The simulation results indicate that the semi-elliptical crack propagates from the WM through the HAZ to the BM, with its morphology transitioning from semi-ellipse to valley shape and then to semi-circle as fatigue cycles increase, resulting in stress concentration at the crack front of the WM zone.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112959"},"PeriodicalIF":7.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850392","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 : 2025-04-18DOI: 10.1016/j.corsci.2025.112949
Di Mei , Yishun Tian , Shuya Mao , Tiancai Kong , Zhipeng Liu , Jinxue Liu , Haitao Xie , Yang Xiao , Liguo Wang , Shijie Zhu , Shaokang Guan
Magnesium-lithium (Mg-Li) alloy is a lightweight structural material, but the localized corrosion restricts its widespread application. Corrosion inhibitors are an effective strategy for corrosion control, but there is very little research on Mg-Li alloys. This work systematically studied the effect of caffeic acid (CA) on the corrosion behavior of LAZ931 Mg-Li alloy in NaCl electrolyte. The results show that CA effectively slows down the corrosion of the alloy and reduces its localized corrosion tendency by preferentially adsorbing on the Li-rich phase. The findings obtained are of great significance for improving the service reliability of LAZ931 alloy in complex environments.
{"title":"The inhibitory effect of caffeic acid on localized corrosion of LAZ931 Mg alloy","authors":"Di Mei , Yishun Tian , Shuya Mao , Tiancai Kong , Zhipeng Liu , Jinxue Liu , Haitao Xie , Yang Xiao , Liguo Wang , Shijie Zhu , Shaokang Guan","doi":"10.1016/j.corsci.2025.112949","DOIUrl":"10.1016/j.corsci.2025.112949","url":null,"abstract":"<div><div>Magnesium-lithium (Mg-Li) alloy is a lightweight structural material, but the localized corrosion restricts its widespread application. Corrosion inhibitors are an effective strategy for corrosion control, but there is very little research on Mg-Li alloys. This work systematically studied the effect of caffeic acid (CA) on the corrosion behavior of LAZ931 Mg-Li alloy in NaCl electrolyte. The results show that CA effectively slows down the corrosion of the alloy and reduces its localized corrosion tendency by preferentially adsorbing on the Li-rich phase. The findings obtained are of great significance for improving the service reliability of LAZ931 alloy in complex environments.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112949"},"PeriodicalIF":7.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848413","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 : 2025-04-16DOI: 10.1016/j.corsci.2025.112951
Tim M. Schwarz , Nick Birbilis , Baptiste Gault , Ingrid McCarroll
Magnesium alloys continue to play a significant role in the context of lightweight structural materials, albeit that corrosion susceptibility remains a limit to their wider use. Most research to date has focused on aqueous corrosion of Mg alloys, whilst atmospheric corrosion remains poorly understood. Using atom probe tomography and a novel in-situ coating method, the native oxide layer in an additively manufactured Mg-Al alloy (AZ111) was investigated. Aluminum was found to diffuse outwards during oxidation and to be incorporated into a Mg-oxide/hydroxide rather than forming the postulated Al₂O₃ layer. This study advances the understanding of magnesium oxidation.
{"title":"Understanding the Al diffusion pathway during atmospheric corrosion of a Mg-Al alloy using atom probe tomography","authors":"Tim M. Schwarz , Nick Birbilis , Baptiste Gault , Ingrid McCarroll","doi":"10.1016/j.corsci.2025.112951","DOIUrl":"10.1016/j.corsci.2025.112951","url":null,"abstract":"<div><div>Magnesium alloys continue to play a significant role in the context of lightweight structural materials, albeit that corrosion susceptibility remains a limit to their wider use. Most research to date has focused on aqueous corrosion of Mg alloys, whilst atmospheric corrosion remains poorly understood. Using atom probe tomography and a novel <em>in-situ</em> coating method, the native oxide layer in an additively manufactured Mg-Al alloy (AZ111) was investigated. Aluminum was found to diffuse outwards during oxidation and to be incorporated into a Mg-oxide/hydroxide rather than forming the postulated Al₂O₃ layer. This study advances the understanding of magnesium oxidation.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112951"},"PeriodicalIF":7.4,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842153","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 : 2025-04-16DOI: 10.1016/j.corsci.2025.112950
Yue Jin , Rui Liu , Yu Cui , R.R.A. Garcia , O.R. Mattos , Fuhui Wang , Li Liu
This study examines the dual-phase Ti-6Al-4V alloy through corrosion fatigue tests in 3.5 wt% NaCl solution under different hydrostatic pressures. The effects of hydrostatic pressure and cyclic loading on the passive film, microstructure, and mechanical properties of the titanium alloy were investigated. Findings reveal that synergic effect of hydrostatic pressure and cyclic mechanical load reduces the compactness of the titanium alloy passive film, inducing crack initiation and propagation, accelerating the fatigue crack propagation rate, and reducing the fatigue life of titanium alloy. This study reveals the corrosion fatigue mechanism of titanium alloys under hydrostatic pressure and cyclic loading, providing reference values for designing components in deep-sea environments.
{"title":"Study on corrosion fatigue of Ti-6Al-4V alloy under hydrostatic pressure environment in 3.5 % NaCl solution","authors":"Yue Jin , Rui Liu , Yu Cui , R.R.A. Garcia , O.R. Mattos , Fuhui Wang , Li Liu","doi":"10.1016/j.corsci.2025.112950","DOIUrl":"10.1016/j.corsci.2025.112950","url":null,"abstract":"<div><div>This study examines the dual-phase Ti-6Al-4V alloy through corrosion fatigue tests in 3.5 wt% NaCl solution under different hydrostatic pressures. The effects of hydrostatic pressure and cyclic loading on the passive film, microstructure, and mechanical properties of the titanium alloy were investigated. Findings reveal that synergic effect of hydrostatic pressure and cyclic mechanical load reduces the compactness of the titanium alloy passive film, inducing crack initiation and propagation, accelerating the fatigue crack propagation rate, and reducing the fatigue life of titanium alloy. This study reveals the corrosion fatigue mechanism of titanium alloys under hydrostatic pressure and cyclic loading, providing reference values for designing components in deep-sea environments.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112950"},"PeriodicalIF":7.4,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842152","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 : 2025-04-15DOI: 10.1016/j.corsci.2025.112947
Qingchen Deng , Ziyi Liu , Qianye Wu , Xiyu Li , Xiao Han , Chenyang Ding , Yuhao Jin , Yujuan Wu , Wenjiang Ding , Liming Peng
Additive manufacturing of Mg alloys via laser powder bed fusion (LPBF) has garnered increasing interest due to its capacity to produce superior mechanical properties compared to conventional as-cast alloys. However, the corrosion resistance of as-built Mg alloys relative to their as-cast counterparts remains poorly understood. In this study, a high-strength Mg-11Gd-2Zn-0.4Zr (wt.%, GZ112K) alloy is fabricated using both LPBF and semi-continuous casting techniques. The corrosion behavior of both as-built and as-cast alloys is systematically evaluated before and after solution and aging (T4 and T6) heat treatment processes. Electrochemical and immersion tests reveal the following corrosion resistance ranking: As-built < LPBF-T6 < LPBF-T4 < F-T4 < F-T6 < As-cast. The as-built alloy, despite having finer grains and (Mg,Zn)3Gd eutectic secondary phase that enhance tensile properties, exhibits poorer corrosion resistance primarily due to the network distribution of (Mg,Zn)3Gd along grain boundaries, which lacks a corrosion barrier effect while increasing the cathode-to-anode ratio. During T4 treatment, the (Mg,Zn)3Gd phase transforms into blocky X phase along grain boundaries and lamellar long-period stacking ordered (LPSO) structures within the grains, reducing Volta potential differences, thereby improving corrosion resistance. However, the formation of β′ aging precipitates in the LPBF-T6 alloy increases the micro-galvanic corrosion tendency, reducing corrosion resistance. This study underscores the critical role of T4 and T6 heat treatments in optimizing the corrosion resistance of additively manufactured Mg alloys.
{"title":"Corrosion behavior of Mg-11Gd-2Zn-0.4Zr alloy before and after heat treatment: Additive manufacturing versus casting","authors":"Qingchen Deng , Ziyi Liu , Qianye Wu , Xiyu Li , Xiao Han , Chenyang Ding , Yuhao Jin , Yujuan Wu , Wenjiang Ding , Liming Peng","doi":"10.1016/j.corsci.2025.112947","DOIUrl":"10.1016/j.corsci.2025.112947","url":null,"abstract":"<div><div>Additive manufacturing of Mg alloys via laser powder bed fusion (LPBF) has garnered increasing interest due to its capacity to produce superior mechanical properties compared to conventional as-cast alloys. However, the corrosion resistance of as-built Mg alloys relative to their as-cast counterparts remains poorly understood. In this study, a high-strength Mg-11Gd-2Zn-0.4Zr (wt.%, GZ112K) alloy is fabricated using both LPBF and semi-continuous casting techniques. The corrosion behavior of both as-built and as-cast alloys is systematically evaluated before and after solution and aging (T4 and T6) heat treatment processes. Electrochemical and immersion tests reveal the following corrosion resistance ranking: As-built < LPBF-T6 < LPBF-T4 < F-T4 < F-T6 < As-cast. The as-built alloy, despite having finer grains and (Mg,Zn)<sub>3</sub>Gd eutectic secondary phase that enhance tensile properties, exhibits poorer corrosion resistance primarily due to the network distribution of (Mg,Zn)<sub>3</sub>Gd along grain boundaries, which lacks a corrosion barrier effect while increasing the cathode-to-anode ratio. During T4 treatment, the (Mg,Zn)<sub>3</sub>Gd phase transforms into blocky X phase along grain boundaries and lamellar long-period stacking ordered (LPSO) structures within the grains, reducing Volta potential differences, thereby improving corrosion resistance. However, the formation of β′ aging precipitates in the LPBF-T6 alloy increases the micro-galvanic corrosion tendency, reducing corrosion resistance. This study underscores the critical role of T4 and T6 heat treatments in optimizing the corrosion resistance of additively manufactured Mg alloys.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112947"},"PeriodicalIF":7.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859014","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 : 2025-04-15DOI: 10.1016/j.corsci.2025.112942
Xiao-Ze Ma , Xu Wang , Ting Chen , Jia-Chu Yang , Le Shi , Kai Zhu , Xin-Xin Zhang , Wen-Tie Yang , Ze-Hua Dong
This study investigated the deterioration mechanism of anti-rust oil (ARO) composed of sodium petroleum sulfonate (SPS) and white oil in humid atmospheres. The results demonstrated that ARO film can effectively intercept intruding saline droplets to protect the steel substrate. Micro-infrared analysis reveals that the SPS can transform water molecules from free to bound states through directional adsorption and reversed micelle effect, thereby reducing the corrosivity of intruding moisture in AROs. However, excessive saline intrusion may destabilise water-in-oil (W/O) micelles, causing water droplets to re-deposit on the surface of the steel substrate. Theoretical calculations suggest that the intermolecular forces between water clusters and metal ions enhance the electrostatic repulsion between the sulfonic groups of SPS, thus destroying the water/oil emulsion system and increasing the risk of corrosion.
{"title":"Atmospheric corrosion of mild steel under thin oil film: Emulsification, dispersion, and simulation of saline microdroplets in the oil phase","authors":"Xiao-Ze Ma , Xu Wang , Ting Chen , Jia-Chu Yang , Le Shi , Kai Zhu , Xin-Xin Zhang , Wen-Tie Yang , Ze-Hua Dong","doi":"10.1016/j.corsci.2025.112942","DOIUrl":"10.1016/j.corsci.2025.112942","url":null,"abstract":"<div><div>This study investigated the deterioration mechanism of anti-rust oil (ARO) composed of sodium petroleum sulfonate (SPS) and white oil in humid atmospheres. The results demonstrated that ARO film can effectively intercept intruding saline droplets to protect the steel substrate. Micro-infrared analysis reveals that the SPS can transform water molecules from free to bound states through directional adsorption and reversed micelle effect, thereby reducing the corrosivity of intruding moisture in AROs. However, excessive saline intrusion may destabilise water-in-oil (W/O) micelles, causing water droplets to re-deposit on the surface of the steel substrate. Theoretical calculations suggest that the intermolecular forces between water clusters and metal ions enhance the electrostatic repulsion between the sulfonic groups of SPS, thus destroying the water/oil emulsion system and increasing the risk of corrosion.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112942"},"PeriodicalIF":7.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842151","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}
This research provides detailed insights into the correlation of microstructural and morphological characteristics of a Cr/CrN multilayer coating deposited onto steel and its corrosion behavior, by examining its local surface electronic properties, nanomechanical behavior, and electrochemical activity in a 3.5 % NaCl solution. A key focus of the study is the influence of physicochemical surface evolution on nano-mechanical properties of Cr/CrN coating. This is investigated by correlating electrochemical data from electrochemical impedance spectroscopy (EIS) with findings from X-ray photoelectron spectroscopy (XPS) and nanoindentation analysis. The integrated approach shed light on physicochemical evolution of the coating, and its resistance to corrosion in demanding environments.
{"title":"A combined microstructural, electrochemical and nanomechanical study of the corrosion and passivation properties of a Cr/CrN multilayer coating","authors":"Ehsan Rahimi , Thijs Nijdam , Adwait Jahagirdar , Esteban Broitman , Arjan Mol","doi":"10.1016/j.corsci.2025.112943","DOIUrl":"10.1016/j.corsci.2025.112943","url":null,"abstract":"<div><div>This research provides detailed insights into the correlation of microstructural and morphological characteristics of a Cr/CrN multilayer coating deposited onto steel and its corrosion behavior, by examining its local surface electronic properties, nanomechanical behavior, and electrochemical activity in a 3.5 % NaCl solution. A key focus of the study is the influence of physicochemical surface evolution on nano-mechanical properties of Cr/CrN coating. This is investigated by correlating electrochemical data from electrochemical impedance spectroscopy (EIS) with findings from X-ray photoelectron spectroscopy (XPS) and nanoindentation analysis. The integrated approach shed light on physicochemical evolution of the coating, and its resistance to corrosion in demanding environments.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"252 ","pages":"Article 112943"},"PeriodicalIF":7.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842154","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}
Aluminide coatings are essential for protecting gas turbine hot-section components, but their longevity is often limited by the degradation of the protective β-NiAl phase. This study aims to elucidate the fundamental mechanisms driving β-NiAl degradation by comparing its behavior in aluminide coatings deposited on a nickel-based superalloy under isothermal oxidation (1100°C, air) and vacuum heat treatment (1100°C, vacuum) conditions. The results demonstrate conclusively that β-NiAl degradation is primarily caused by coating-substrate interdiffusion, which leads to Ni enrichment within the coating, rather than by Al depletion resulting from the formation of the surface oxide scale. Degradation was observed to initiate preferentially at the coating surface, the interface between coating sublayers, and the coating-substrate interface. Furthermore, thinner coatings exhibited accelerated β-NiAl degradation due to enhanced Ni enrichment resulting from shorter diffusion distances. These findings highlight the importance of managing diffusion processes to enhance coating performance and durability in high-temperature environments.
{"title":"Unraveling β-NiAl degradation in aluminide coatings: A comparative study of isothermal oxidation and vacuum heat treatment","authors":"Guo-Hui Meng, Shan-Shan Li, Ya-Nan Wang, Pei-Pei Gui, Ming-Yang Zhang, Kai-Yu Guo, Mei-Jun Liu, Guan-Jun Yang","doi":"10.1016/j.corsci.2025.112946","DOIUrl":"10.1016/j.corsci.2025.112946","url":null,"abstract":"<div><div>Aluminide coatings are essential for protecting gas turbine hot-section components, but their longevity is often limited by the degradation of the protective β-NiAl phase. This study aims to elucidate the fundamental mechanisms driving β-NiAl degradation by comparing its behavior in aluminide coatings deposited on a nickel-based superalloy under isothermal oxidation (1100°C, air) and vacuum heat treatment (1100°C, vacuum) conditions. The results demonstrate conclusively that β-NiAl degradation is primarily caused by coating-substrate interdiffusion, which leads to Ni enrichment within the coating, rather than by Al depletion resulting from the formation of the surface oxide scale. Degradation was observed to initiate preferentially at the coating surface, the interface between coating sublayers, and the coating-substrate interface. Furthermore, thinner coatings exhibited accelerated β-NiAl degradation due to enhanced Ni enrichment resulting from shorter diffusion distances. These findings highlight the importance of managing diffusion processes to enhance coating performance and durability in high-temperature environments.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"251 ","pages":"Article 112946"},"PeriodicalIF":7.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834914","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}
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