Pub Date : 2025-02-20DOI: 10.1016/j.corsci.2025.112810
Zhichao Che , Hui Xue , Jing Liu , Xun Zhou , Wei Liu , Shufeng Yang , Yuzhou Du , Xuequn Cheng , Xiaogang Li , Chao Liu
This work illustrates the relationship between dislocation density and corrosion resistance of 316L stainless steel based on passive film nucleation growth kinetics calculations. Contrary to previous reports, the increase in high dislocation density zones is an important feature associated with the passivation behaviour of stainless steel. With the expansion of the high dislocation density region, the passivation current density decreases from 1.48 × 10−5 A·cm−2 to 1.35 × 10−7 A·cm−2, and the corrosion resistance of the stainless steel increases. The results of TEM showed that the thickness of the passive film increased from 3 ∼ 4 nm to 6 ∼ 7 nm after 72 h of immersion after the dislocation density was increased. Based on the laboratory results, a theoretical validation was carried out by means of a computational model of passive film nucleation and growth kinetics. The results show that the number of nucleation sites can be increased by increasing the dislocation density, resulting in faster passive film growth. Te and La improve the stability of the passive film mainly by hindering the dissolution of the elements. La does not exist stably in the passive film but can be preferentially deposited to increase the nucleation sites to promote the growth of the passive film.
{"title":"A novel understanding of dislocation density effect on the corrosion resistance of 316L stainless steel with passive film nucleation growth kinetic calculation","authors":"Zhichao Che , Hui Xue , Jing Liu , Xun Zhou , Wei Liu , Shufeng Yang , Yuzhou Du , Xuequn Cheng , Xiaogang Li , Chao Liu","doi":"10.1016/j.corsci.2025.112810","DOIUrl":"10.1016/j.corsci.2025.112810","url":null,"abstract":"<div><div>This work illustrates the relationship between dislocation density and corrosion resistance of 316L stainless steel based on passive film nucleation growth kinetics calculations. Contrary to previous reports, the increase in high dislocation density zones is an important feature associated with the passivation behaviour of stainless steel. With the expansion of the high dislocation density region, the passivation current density decreases from 1.48 × 10<sup>−5</sup> A·cm<sup>−2</sup> to 1.35 × 10<sup>−7</sup> A·cm<sup>−2</sup>, and the corrosion resistance of the stainless steel increases. The results of TEM showed that the thickness of the passive film increased from 3 ∼ 4 nm to 6 ∼ 7 nm after 72 h of immersion after the dislocation density was increased. Based on the laboratory results, a theoretical validation was carried out by means of a computational model of passive film nucleation and growth kinetics. The results show that the number of nucleation sites can be increased by increasing the dislocation density, resulting in faster passive film growth. Te and La improve the stability of the passive film mainly by hindering the dissolution of the elements. La does not exist stably in the passive film but can be preferentially deposited to increase the nucleation sites to promote the growth of the passive film.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112810"},"PeriodicalIF":7.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464011","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 : 2025-02-20DOI: 10.1016/j.corsci.2025.112797
Boxin Wei , Zheng Cai , Mengchao Niu , Jin Xu , Bokai Liao , Tangqing Wu , Changkun Yu , Cheng Sun
This study investigated microbiologically influenced corrosion (MIC) of steel in offshore produced seawater at 60 °C. Microbial community analysis identified Desulfomicrobium and Methanosarcinaceae as the dominant microbial genera. Corrosion analyses revealed that Desulfomicrobium reduced sulfate to H₂S, while methanogens utilized carbon dioxide to produce methane, collectively driving MIC. After 14 days, corrosion weight loss reached 0.32 ± 0.023 mm y⁻¹ , with pitting depths up to 29 µm, indicating severe pitting corrosion. The corrosion products exhibited a double-layer structure, promoting microbial colonization and ion transport. These findings highlight the pivotal role of microbial activity in accelerating steel corrosion under real-world conditions.
{"title":"Synergistic microbial interactions and electrochemical mechanisms driving microbiologically influenced corrosion in offshore platform produced seawater at 60 °C","authors":"Boxin Wei , Zheng Cai , Mengchao Niu , Jin Xu , Bokai Liao , Tangqing Wu , Changkun Yu , Cheng Sun","doi":"10.1016/j.corsci.2025.112797","DOIUrl":"10.1016/j.corsci.2025.112797","url":null,"abstract":"<div><div>This study investigated microbiologically influenced corrosion (MIC) of steel in offshore produced seawater at 60 °C. Microbial community analysis identified <em>Desulfomicrobium</em> and <em>Methanosarcinaceae</em> as the dominant microbial genera. Corrosion analyses revealed that <em>Desulfomicrobium</em> reduced sulfate to H₂S, while methanogens utilized carbon dioxide to produce methane, collectively driving MIC. After 14 days, corrosion weight loss reached 0.32 ± 0.023 mm y⁻¹ , with pitting depths up to 29 µm, indicating severe pitting corrosion. The corrosion products exhibited a double-layer structure, promoting microbial colonization and ion transport. These findings highlight the pivotal role of microbial activity in accelerating steel corrosion under real-world conditions.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112797"},"PeriodicalIF":7.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480173","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 : 2025-02-20DOI: 10.1016/j.corsci.2025.112807
Yalin Wu , Zhilin Li , Di Wang , Zehong Tian , Bei Liu , Zishuai Zhou , Tingyue Gu , Fuhui Wang , Dake Xu
Microbiologically influenced corrosion (MIC) caused by anaerobic Desulfovibrio vulgaris and aerobic Bacillus licheniformis was inhibited by an advanced Cr-Cu-bearing pipeline steel combined with bifunctional biocide rosin thiourea iminazole quaternary ammonium salt (RTIQAS) and antibacterial silver nanoparticles (Ag NPs). The combination of Cr-Cu-bearing steel with 50 ppm RTIQAS and 50 ppm Ag NPs achieved 99 % and 82 % reductions in icorr, and more than 99 % and 88 % reductions in weight loss, caused by D. vulgaris and B. licheniformis, respectively, compared to untreated X80 carbon steel. This work provides a promising multi-faceted strategy for MIC prevention using advanced steel with eco-friendly biocides.
{"title":"Combination of Cr-Cu-bearing pipeline steel and novel biocides as a strategy to combat microbiologically influenced corrosion","authors":"Yalin Wu , Zhilin Li , Di Wang , Zehong Tian , Bei Liu , Zishuai Zhou , Tingyue Gu , Fuhui Wang , Dake Xu","doi":"10.1016/j.corsci.2025.112807","DOIUrl":"10.1016/j.corsci.2025.112807","url":null,"abstract":"<div><div>Microbiologically influenced corrosion (MIC) caused by anaerobic <em>Desulfovibrio vulgaris</em> and aerobic <em>Bacillus licheniformis</em> was inhibited by an advanced Cr-Cu-bearing pipeline steel combined with bifunctional biocide rosin thiourea iminazole quaternary ammonium salt (RTIQAS) and antibacterial silver nanoparticles (Ag NPs). The combination of Cr-Cu-bearing steel with 50 ppm RTIQAS and 50 ppm Ag NPs achieved 99 % and 82 % reductions in <em>i</em><sub>corr</sub>, and more than 99 % and 88 % reductions in weight loss, caused by <em>D. vulgaris</em> and <em>B. licheniformis</em>, respectively, compared to untreated X80 carbon steel. This work provides a promising multi-faceted strategy for MIC prevention using advanced steel with eco-friendly biocides.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112807"},"PeriodicalIF":7.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143488335","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 : 2025-02-19DOI: 10.1016/j.corsci.2025.112802
Yanan Pu , Zihao Guo , Su Hou , Yue Hou , Congrui Zhu , Fan Feng , Hongbo Zeng , Shougang Chen
The susceptibility of 90/10 Cu-Ni alloy to crevice corrosion induced by Desulfovibrio vulgaris was investigated using a custom-designed crevice structure device under varying media conditions. There was no crevice corrosion in 20 % carbon source (CS) medium inoculated with D. vulgaris, whereas noticeable crevice corrosion occurred in 100 % CS D. vulgaris medium. The uneven distribution of D. vulgaris biofilms between the crevice interior and exterior resulted in localized variations in cathodic species concentration and electrochemical potentials, identified as key factors driving and accelerating crevice corrosion. The deceleration of crevice corrosion in the later stages was attributed to a decline in electrochemical driving force, likely caused by the diminished metabolic activity of D. vulgaris.
{"title":"Toward understanding the microbiologically induced crevice corrosion of 90/10 Cu-Ni alloy in the presence of Desulfovibrio vulgaris","authors":"Yanan Pu , Zihao Guo , Su Hou , Yue Hou , Congrui Zhu , Fan Feng , Hongbo Zeng , Shougang Chen","doi":"10.1016/j.corsci.2025.112802","DOIUrl":"10.1016/j.corsci.2025.112802","url":null,"abstract":"<div><div>The susceptibility of 90/10 Cu-Ni alloy to crevice corrosion induced by <em>Desulfovibrio vulgaris</em> was investigated using a custom-designed crevice structure device under varying media conditions. There was no crevice corrosion in 20 % carbon source (CS) medium inoculated with <em>D. vulgaris</em>, whereas noticeable crevice corrosion occurred in 100 % CS <em>D. vulgaris</em> medium. The uneven distribution of <em>D. vulgaris</em> biofilms between the crevice interior and exterior resulted in localized variations in cathodic species concentration and electrochemical potentials, identified as key factors driving and accelerating crevice corrosion. The deceleration of crevice corrosion in the later stages was attributed to a decline in electrochemical driving force, likely caused by the diminished metabolic activity of <em>D. vulgaris</em>.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112802"},"PeriodicalIF":7.4,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464012","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 : 2025-02-19DOI: 10.1016/j.corsci.2025.112805
Zuojun Jiao , Yan Zhou , Xiaowei Dai , Jiahao Wu , Yonghua Chen , Mingyi Wu , Wenhui Yao , Yuan Yuan , Zhihui Xie , Yanlong Ma , Atrens Andrej , Liang Wu
To obtain magnesium (Mg) alloys with long-term corrosion resistance, coatings with enhanced stability and self-healing effect are necessary. This study in-situ produced a layered double hydroxides (LDHs) coating using hydrothermal method to process the cerium salt treated micro arc oxidation (MAO) coating in sodium dodecylbenzene sulfonate (SDBS)-modified graphene oxide (GO) solution (MgAlCe-LDHs@GO-SDBS), and further introduced 3,5-dinitrosalicylic (D) acid and quinolizic acid (Q) via anion-exchange method. The multiple effects of Ce, GO-SDBS, and corrosion inhibitors significantly enhanced the coatings’ anti-corrosive and self-healing performance. The MgAlCe-LDHs@GO-S&D coating possessed significantly decreased corrosion current density of 3.6 × 10−9 A·cm−2.
{"title":"A bimodified MgAlCe-LDHs@GO self-healing anti-corrosion coating based on the micro arc oxidation coating of AZ31 magnesium alloy","authors":"Zuojun Jiao , Yan Zhou , Xiaowei Dai , Jiahao Wu , Yonghua Chen , Mingyi Wu , Wenhui Yao , Yuan Yuan , Zhihui Xie , Yanlong Ma , Atrens Andrej , Liang Wu","doi":"10.1016/j.corsci.2025.112805","DOIUrl":"10.1016/j.corsci.2025.112805","url":null,"abstract":"<div><div>To obtain magnesium (Mg) alloys with long-term corrosion resistance, coatings with enhanced stability and self-healing effect are necessary. This study in-situ produced a layered double hydroxides (LDHs) coating using hydrothermal method to process the cerium salt treated micro arc oxidation (MAO) coating in sodium dodecylbenzene sulfonate (SDBS)-modified graphene oxide (GO) solution (MgAlCe-LDHs@GO-SDBS), and further introduced 3,5-dinitrosalicylic (D) acid and quinolizic acid (Q) via anion-exchange method. The multiple effects of Ce, GO-SDBS, and corrosion inhibitors significantly enhanced the coatings’ anti-corrosive and self-healing performance. The MgAlCe-LDHs@GO-S&D coating possessed significantly decreased corrosion current density of 3.6 × 10<sup>−9</sup> A·cm<sup>−2</sup>.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112805"},"PeriodicalIF":7.4,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480175","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 : 2025-02-18DOI: 10.1016/j.corsci.2025.112801
J. Chen , X. Pan , H.Y. Nie , B. Kobe , E. Bergendal , C. Lilja , M. Behazin , D.W. Shoesmith , J.J. Noël
Damage to Cu corroded in sulfide-containing solutions was investigated using scanning electron microscopy and surface profilometry. For dilute sulfide solutions (≤ 5 × 10−5 M), a thin, porous film was formed, and general corrosion to a depth of < 1 μm observed. At a higher concentration (5 × 10−4 M), a compact film was formed and micro-galvanic corrosion observed. With increasing exposure time at higher concentration, the extent of micro-galvanic corrosion decreased in favor of general corrosion, as the aspect ratio of the locally corroded sites increased. This indicates that micro-galvanic corrosion will eventually be stifled and only rough general corrosion observed.
{"title":"Topographical and statistical studies of the corrosion damage underneath a sulfide film formed on a Cu surface","authors":"J. Chen , X. Pan , H.Y. Nie , B. Kobe , E. Bergendal , C. Lilja , M. Behazin , D.W. Shoesmith , J.J. Noël","doi":"10.1016/j.corsci.2025.112801","DOIUrl":"10.1016/j.corsci.2025.112801","url":null,"abstract":"<div><div>Damage to Cu corroded in sulfide-containing solutions was investigated using scanning electron microscopy and surface profilometry. For dilute sulfide solutions (≤ 5 × 10<sup>−5</sup> M), a thin, porous film was formed, and general corrosion to a depth of < 1 μm observed. At a higher concentration (5 × 10<sup>−4</sup> M), a compact film was formed and micro-galvanic corrosion observed. With increasing exposure time at higher concentration, the extent of micro-galvanic corrosion decreased in favor of general corrosion, as the aspect ratio of the locally corroded sites increased. This indicates that micro-galvanic corrosion will eventually be stifled and only rough general corrosion observed.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112801"},"PeriodicalIF":7.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-18DOI: 10.1016/j.corsci.2025.112800
Alyshia Keogh , Emily Aradi , Mark Taylor , Anthony Cook , Ed Pickering , Zacharie Obadia , Philip Prangnell , Fabio Scenini
The effect of microstructure on the localised corrosion resistance of 15–5PH stainless steel was investigated as a function of ageing temperature (450°C, 540°C and 650°C). Microstructural characterisation revealed an increase in reverted austenite content for samples aged at 650°C. Cu precipitates increased in size with ageing temperature. Cr carbides were observed in samples aged at 540°C, and in samples aged at 650°C with a greater size and number density. Potentiodynamic Polarisation (PDP) and Double-Loop Electrochemical Potentiokinetic Reactivation (DL-EPR) were used to determine the Pitting Potential (Epit) and the Degree Of Reactivation (DOR) at each ageing temperature, respectively. The scatter in the measured Epit values was too large to confidently rank pitting susceptibility as a function of ageing temperature. However, it was found that the DOR increased with ageing temperature; this increase correlated with an increase in density of Cr carbides in the microstructure at an ageing temperatures of 540°C and the formation of reverted austenite at 650 °C. These heat treatment induced changes resulted in the distribution of Cr in the microstructure becoming less homogeneous as the ageing temperature increased, leading to a likely increase in the number of susceptible sites for localised corrosion by disruption of the integrity of the passive film.
{"title":"Effect of ageing temperature on the microstructure and localised corrosion of 15–5PH stainless steel","authors":"Alyshia Keogh , Emily Aradi , Mark Taylor , Anthony Cook , Ed Pickering , Zacharie Obadia , Philip Prangnell , Fabio Scenini","doi":"10.1016/j.corsci.2025.112800","DOIUrl":"10.1016/j.corsci.2025.112800","url":null,"abstract":"<div><div>The effect of microstructure on the localised corrosion resistance of 15–5PH stainless steel was investigated as a function of ageing temperature (450°C, 540°C and 650°C). Microstructural characterisation revealed an increase in reverted austenite content for samples aged at 650°C. Cu precipitates increased in size with ageing temperature. Cr carbides were observed in samples aged at 540°C, and in samples aged at 650°C with a greater size and number density. Potentiodynamic Polarisation (PDP) and Double-Loop Electrochemical Potentiokinetic Reactivation (DL-EPR) were used to determine the Pitting Potential (E<sub>pit</sub>) and the Degree Of Reactivation (DOR) at each ageing temperature, respectively. The scatter in the measured E<sub>pit</sub> values was too large to confidently rank pitting susceptibility as a function of ageing temperature. However, it was found that the DOR increased with ageing temperature; this increase correlated with an increase in density of Cr carbides in the microstructure at an ageing temperatures of 540°C and the formation of reverted austenite at 650 °C. These heat treatment induced changes resulted in the distribution of Cr in the microstructure becoming less homogeneous as the ageing temperature increased, leading to a likely increase in the number of susceptible sites for localised corrosion by disruption of the integrity of the passive film.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112800"},"PeriodicalIF":7.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-18DOI: 10.1016/j.corsci.2025.112796
Mohammad Alinezhadfar , Patrik Schmutz , Fabio E. Furcas , Joakim Reuteler , Rowena Crockett , Ueli Angst
This study investigates the formation mechanism of zinc phosphate conversion coatings on pearlitic steel and ferritic iron with emphasis on the impact of microstructure and substrate corrosion. Deposition parameters, including pH (2 and 2.5) and temperature (50°C and 70°C), were explored. Open circuit potential (OCP) monitoring was used to identify different stages of coating formation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed that higher temperatures accelerated the growth of phosphate crystals, composed of hopeite (Zn3(PO4)2) and phosphophyllite (Zn2Fe(PO4)2) on both substrates. Deposition at pH 2.5 led to bulk-solution precipitation on substrates, while at pH 2, coatings were growing from the substrate surface. Electrochemical impedance (EIS) and inductively coupled plasma mass spectrometry (ICP-MS) measurements revealed that iron corroded around 2.5 times slower than steel. As identified by energy dispersive X-ray spectroscopy (EDS) in SEM, iron phosphate particles were formed on both substrates. These particles accumulated in higher amounts on steel, while iron exhibited minimal corrosion product accumulation. Different phosphating stages were then studied using SEM and time-of-flight – secondary ion mass spectrometry (ToF-SIMS). ToF-SIMS depth profiles highlighted a thicker iron phosphate layer on steel at early phosphating stages, compared to iron. Focused ion beam (FIB) cross-sections of fully phosphated steel showed a porous interlayer, mainly composed of iron-phosphate, at the coating/steel interface. Zinc phosphate crystals were nucleated on this porous layer or formed by near-surface solution precipitation. Iron substrates did not show this porous interlayer, and had lower phosphatability with only near-surface solution precipitation of zinc phosphate crystals.
{"title":"Mechanism of zinc phosphate conversion coating formation on iron-based substrates","authors":"Mohammad Alinezhadfar , Patrik Schmutz , Fabio E. Furcas , Joakim Reuteler , Rowena Crockett , Ueli Angst","doi":"10.1016/j.corsci.2025.112796","DOIUrl":"10.1016/j.corsci.2025.112796","url":null,"abstract":"<div><div>This study investigates the formation mechanism of zinc phosphate conversion coatings on pearlitic steel and ferritic iron with emphasis on the impact of microstructure and substrate corrosion. Deposition parameters, including pH (2 and 2.5) and temperature (50°C and 70°C), were explored. Open circuit potential (OCP) monitoring was used to identify different stages of coating formation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed that higher temperatures accelerated the growth of phosphate crystals, composed of hopeite (Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>) and phosphophyllite (Zn<sub>2</sub>Fe(PO<sub>4</sub>)<sub>2</sub>) on both substrates. Deposition at pH 2.5 led to bulk-solution precipitation on substrates, while at pH 2, coatings were growing from the substrate surface. Electrochemical impedance (EIS) and inductively coupled plasma mass spectrometry (ICP-MS) measurements revealed that iron corroded around 2.5 times slower than steel. As identified by energy dispersive X-ray spectroscopy (EDS) in SEM, iron phosphate particles were formed on both substrates. These particles accumulated in higher amounts on steel, while iron exhibited minimal corrosion product accumulation. Different phosphating stages were then studied using SEM and time-of-flight – secondary ion mass spectrometry (ToF-SIMS). ToF-SIMS depth profiles highlighted a thicker iron phosphate layer on steel at early phosphating stages, compared to iron. Focused ion beam (FIB) cross-sections of fully phosphated steel showed a porous interlayer, mainly composed of iron-phosphate, at the coating/steel interface. Zinc phosphate crystals were nucleated on this porous layer or formed by near-surface solution precipitation. Iron substrates did not show this porous interlayer, and had lower phosphatability with only near-surface solution precipitation of zinc phosphate crystals.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112796"},"PeriodicalIF":7.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-18DOI: 10.1016/j.corsci.2025.112803
Xiejing Luo , Luqi Chang , Chenhao Ren , Yingyu Ding , Jiuhong Zhang , Dawei Zhang , Jizheng Yao , Zhanfeng Deng , Chaofang Dong
The potential application of renewable energy sources such as wind power and photovoltaics in hydrogen production from water electrolysis has driven the development of bipolar plates. Combined with theoretical conductivity calculations and electrode potential-pH diagram constructions, a novel Nb:Ti:N film for bipolar plates is innovatively designed with excellent electrical conductivity and corrosion resistance, as well as high thermal and chemical stability. The Nb and N elements improve the electronic delocalisation effect and transport capacity of Ti and TiO2, and the interfacial contact resistance of the Nb:Ti:N film modified Ti bipolar plates has been decreased to 3.27 mΩ cm2 at 1.4 MPa, with an enhancement of electrical conductivity by about 86 %. At 0 < pH < 7, both Ti metal and Nb metal present good stability and the passivation zone is mainly in the form of TiO2 and Nb2O5. At 1.8 V (vs. Ag/AgCl), the corrosion resistance of Nb metal is better and the Nb oxide formed by passivation of Nb metal prevents the dissolution of Ti substrate into TiO2+ and (TiO2)2+ ions. Moreover, periodic triangle and square wave polarization potentials have been applied to simulate wind and photovoltaic power input. By evaluating the durability and dynamic response characteristics of the bipolar plates under fluctuating voltage input conditions, it can be concluded that the high potential promotes the passivation behavior of Nb metal in Nb:Ti:N films, which results in a fast response to current fluctuations caused by fluctuating potentials.
{"title":"Dynamic response to fluctuating input of Nb:Ti:N film modified Ti bipolar plates for proton exchange membrane water electrolyser","authors":"Xiejing Luo , Luqi Chang , Chenhao Ren , Yingyu Ding , Jiuhong Zhang , Dawei Zhang , Jizheng Yao , Zhanfeng Deng , Chaofang Dong","doi":"10.1016/j.corsci.2025.112803","DOIUrl":"10.1016/j.corsci.2025.112803","url":null,"abstract":"<div><div>The potential application of renewable energy sources such as wind power and photovoltaics in hydrogen production from water electrolysis has driven the development of bipolar plates. Combined with theoretical conductivity calculations and electrode potential-pH diagram constructions, a novel Nb:Ti:N film for bipolar plates is innovatively designed with excellent electrical conductivity and corrosion resistance, as well as high thermal and chemical stability. The Nb and N elements improve the electronic delocalisation effect and transport capacity of Ti and TiO<sub>2</sub>, and the interfacial contact resistance of the Nb:Ti:N film modified Ti bipolar plates has been decreased to 3.27 mΩ cm<sup>2</sup> at 1.4 MPa, with an enhancement of electrical conductivity by about 86 %. At 0 < pH < 7, both Ti metal and Nb metal present good stability and the passivation zone is mainly in the form of TiO<sub>2</sub> and Nb<sub>2</sub>O<sub>5</sub>. At 1.8 V (vs. Ag/AgCl), the corrosion resistance of Nb metal is better and the Nb oxide formed by passivation of Nb metal prevents the dissolution of Ti substrate into TiO<sup>2+</sup> and (TiO<sub>2</sub>)<sup>2+</sup> ions. Moreover, periodic triangle and square wave polarization potentials have been applied to simulate wind and photovoltaic power input. By evaluating the durability and dynamic response characteristics of the bipolar plates under fluctuating voltage input conditions, it can be concluded that the high potential promotes the passivation behavior of Nb metal in Nb:Ti:N films, which results in a fast response to current fluctuations caused by fluctuating potentials.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112803"},"PeriodicalIF":7.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509162","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 : 2025-02-18DOI: 10.1016/j.corsci.2025.112804
Pengfei Gao , Yanhui Li , Wang Zhu , Jie Qiu , Zhouyang Bai , Qibo Wang , Shaoming Ding
This study investigates the corrosion behavior of 308L stainless steel in simulated small modular reactor boron-free and boron containing environments after exposure of long period. It reveals the twin crystal structures of the porous Fe₃O₄-dominated outer layer and the dynamic transformation of the oxide film components, from Cr₂O₃ in the early stages to FeCr₂O₄ with extended exposure. The mechanism of boron incorporation into the film and its role in enhancing corrosion resistance were also analyzed. These findings elucidate oxide film mechanisms, offering innovative insights for optimizing material design and extending SMR component lifespan under varying water chemistries.
{"title":"Dynamic oxide film evolution and corrosion mechanisms of 308L stainless steel in simulated SMR environments","authors":"Pengfei Gao , Yanhui Li , Wang Zhu , Jie Qiu , Zhouyang Bai , Qibo Wang , Shaoming Ding","doi":"10.1016/j.corsci.2025.112804","DOIUrl":"10.1016/j.corsci.2025.112804","url":null,"abstract":"<div><div>This study investigates the corrosion behavior of 308L stainless steel in simulated small modular reactor boron-free and boron containing environments after exposure of long period. It reveals the twin crystal structures of the porous Fe₃O₄-dominated outer layer and the dynamic transformation of the oxide film components, from Cr₂O₃ in the early stages to FeCr₂O₄ with extended exposure. The mechanism of boron incorporation into the film and its role in enhancing corrosion resistance were also analyzed. These findings elucidate oxide film mechanisms, offering innovative insights for optimizing material design and extending SMR component lifespan under varying water chemistries.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"248 ","pages":"Article 112804"},"PeriodicalIF":7.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464016","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号