Pub Date : 2025-01-27DOI: 10.1016/j.corsci.2025.112744
Xin Guo , Bingxiao Shi , Zhongheng Fu , Guowei Yang , Yiran Li , Luntao Wang , Lin Lu , Lingwei Ma , Dawei Zhang
Molecular simulations are essential for understanding the corrosion inhibition mechanisms of organic corrosion inhibitors. However, traditional models often focus on ideal metal surfaces, differing from the complex conditions in real environments. In this work, we constructed defective copper/water interfaces to study imidazole adsorption behaviors and to clarify the interactions among imidazole, copper, and water molecules. We found that the adsorption kinetics of imidazole at the defect sites does not correlate with its adsorption stability clearly, due to its competitive adsorption with water molecules. These findings enhance understanding of imidazole adsorption on copper and are important for designing corrosion inhibitors.
{"title":"Atom-scale insight into the adsorption behavior of imidazole corrosion inhibitors at defective copper/water interfaces","authors":"Xin Guo , Bingxiao Shi , Zhongheng Fu , Guowei Yang , Yiran Li , Luntao Wang , Lin Lu , Lingwei Ma , Dawei Zhang","doi":"10.1016/j.corsci.2025.112744","DOIUrl":"10.1016/j.corsci.2025.112744","url":null,"abstract":"<div><div>Molecular simulations are essential for understanding the corrosion inhibition mechanisms of organic corrosion inhibitors. However, traditional models often focus on ideal metal surfaces, differing from the complex conditions in real environments. In this work, we constructed defective copper/water interfaces to study imidazole adsorption behaviors and to clarify the interactions among imidazole, copper, and water molecules. We found that the adsorption kinetics of imidazole at the defect sites does not correlate with its adsorption stability clearly, due to its competitive adsorption with water molecules. These findings enhance understanding of imidazole adsorption on copper and are important for designing corrosion inhibitors.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112744"},"PeriodicalIF":7.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176825","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 : 2025-01-27DOI: 10.1016/j.corsci.2025.112743
Weiping Zhang , Yanqiang Qiao , Xiping Guo , Longfei Li , Xi Nan
A dense and multilayered Si-Cr-Fe-Ti coating was prepared on Nb-Si based alloy by slurry sintering. The oxidation behavior of the coating at 1250, 1350 and 1450 ℃ were systematically investigated. The coating exhibits good oxidation resistance at high temperatures, forming dense and multi-layer scales after oxidation at 1250 ℃∼1350 ℃, while forming a dense glassy silica scale at 1450 ℃. The addition of a certain amount of Ti and Fe is beneficial for the formation and stability of the Cr2TiO5 middle layer, thus effectively inhibiting the further oxidation of Cr2O3 to volatile CrO3.
{"title":"Microstructure characteristics and oxidation behavior of a dense Si-Cr-Fe-Ti coating with a multi-layer structure on Nb-Si based alloy by slurry sintering","authors":"Weiping Zhang , Yanqiang Qiao , Xiping Guo , Longfei Li , Xi Nan","doi":"10.1016/j.corsci.2025.112743","DOIUrl":"10.1016/j.corsci.2025.112743","url":null,"abstract":"<div><div>A dense and multilayered Si-Cr-Fe-Ti coating was prepared on Nb-Si based alloy by slurry sintering. The oxidation behavior of the coating at 1250, 1350 and 1450 ℃ were systematically investigated. The coating exhibits good oxidation resistance at high temperatures, forming dense and multi-layer scales after oxidation at 1250 ℃∼1350 ℃, while forming a dense glassy silica scale at 1450 ℃. The addition of a certain amount of Ti and Fe is beneficial for the formation and stability of the Cr<sub>2</sub>TiO<sub>5</sub> middle layer, thus effectively inhibiting the further oxidation of Cr<sub>2</sub>O<sub>3</sub> to volatile CrO<sub>3</sub>.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112743"},"PeriodicalIF":7.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175889","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 : 2025-01-27DOI: 10.1016/j.corsci.2025.112745
Tatiana Blank , Sabine Behrens , Elisabeth Franziska Lange , Christian Klose , Demircan Canadinc , Martin Durisin , Thomas Lenarz , Hans Jürgen Maier
Cochlear implants (CIs) have revolutionized the treatment of profound hearing loss, yet their long-term durability remains a challenge due to potential corrosion-induced degradation of the platinum electrodes of the CI. This study examines the corrosion behavior of platinum wires under accelerated test conditions, and compares the results with corrosion patterns observed in explanted CI electrodes from patients after almost 1 year and 26 years. Accelerated corrosion tests with frequencies from 1 to 5 kHz were validated as predictive tools for long-term performance, as the surface morphologies of stimulated platinum wires exhibit notable similarities to those of explanted electrodes. The as-drawn wires analyzed in this study exhibit up to 50 % more corrosion attack than annealed ones. Additionally, the impact of grain orientation on corrosion is examined by testing platinum single crystals with different electrochemical methods. For this purpose, single crystals with the orientation [111], [110] and [100] were analyzed. The research highlights the importance of annealing platinum and minimizing plastic deformation during electrode assembly to enhance electrode durability. Corrosion was found to primarily occur at grain boundaries, with grain orientation showing minimal influence. These findings suggest that engineering grain boundary characteristics could significantly improve the corrosion resistance of polycrystalline electrodes, offering a promising pathway to enhance the longevity of CIs.
{"title":"The influence of microstructure on the corrosion behavior of platinum used for cochlea implant electrodes","authors":"Tatiana Blank , Sabine Behrens , Elisabeth Franziska Lange , Christian Klose , Demircan Canadinc , Martin Durisin , Thomas Lenarz , Hans Jürgen Maier","doi":"10.1016/j.corsci.2025.112745","DOIUrl":"10.1016/j.corsci.2025.112745","url":null,"abstract":"<div><div>Cochlear implants (CIs) have revolutionized the treatment of profound hearing loss, yet their long-term durability remains a challenge due to potential corrosion-induced degradation of the platinum electrodes of the CI. This study examines the corrosion behavior of platinum wires under accelerated test conditions, and compares the results with corrosion patterns observed in explanted CI electrodes from patients after almost 1 year and 26 years. Accelerated corrosion tests with frequencies from 1 to 5 kHz were validated as predictive tools for long-term performance, as the surface morphologies of stimulated platinum wires exhibit notable similarities to those of explanted electrodes. The as-drawn wires analyzed in this study exhibit up to 50 % more corrosion attack than annealed ones. Additionally, the impact of grain orientation on corrosion is examined by testing platinum single crystals with different electrochemical methods. For this purpose, single crystals with the orientation [111], [110] and [100] were analyzed. The research highlights the importance of annealing platinum and minimizing plastic deformation during electrode assembly to enhance electrode durability. Corrosion was found to primarily occur at grain boundaries, with grain orientation showing minimal influence. These findings suggest that engineering grain boundary characteristics could significantly improve the corrosion resistance of polycrystalline electrodes, offering a promising pathway to enhance the longevity of CIs.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112745"},"PeriodicalIF":7.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176052","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 : 2025-01-27DOI: 10.1016/j.corsci.2025.112742
Renda Wang , Chengtong Ge , Ping Yu , Bingsheng Li , Chonghong Zhang , Nabil Daghbouj , Fanping Meng , Fangfang Ge , Qing Huang
Cr-based coatings, as protective coatings of Zr-alloy fuel claddings, inevitably suffer from irradiation damage under actual nuclear operating conditions. Here, Cr/CrAlSiN multilayer coatings were deposited on Zircaloy substrates by magnetron sputtering, followed by the evaluation of irradiation resistance using Fe ions. The insertion of nanochannel-CrAlSiN layers refined the columns/grains in Cr layers and increased the interface density, contributing to the greatly enhanced irradiation tolerance and mechanical properties. A low average swelling rate of Cr layers was estimated to be ∼0.015 %/dpa after the irradiation of Fe ions at 400 °C. Moreover, the coating became compacted with strengthening columnar boundaries after low-dose irradiation (∼0.8 dpa). Both nanoindentation and micropillar compression test showed the transformation of the deformation mechanism for the multilayer coating, as the irradiated samples relieved stress mainly depending on the plastic deformation under loading, while many cracks formed in the as-deposited ones. Furthermore, in 1200 °C steam, a significantly thinner and denser oxide scale formed on the irradiated Cr/CrAlSiN coating, indicative of improved oxidation resistance. The mechanism of radiation-decelerated oxidation was briefly discussed.
{"title":"Enhancing the irradiation resistance of Cr coating via periodic insertion of nanochannel CrAlSiN layers that act as elastic unsaturated “sponges”","authors":"Renda Wang , Chengtong Ge , Ping Yu , Bingsheng Li , Chonghong Zhang , Nabil Daghbouj , Fanping Meng , Fangfang Ge , Qing Huang","doi":"10.1016/j.corsci.2025.112742","DOIUrl":"10.1016/j.corsci.2025.112742","url":null,"abstract":"<div><div>Cr-based coatings, as protective coatings of Zr-alloy fuel claddings, inevitably suffer from irradiation damage under actual nuclear operating conditions. Here, Cr/CrAlSiN multilayer coatings were deposited on Zircaloy substrates by magnetron sputtering, followed by the evaluation of irradiation resistance using Fe ions. The insertion of nanochannel-CrAlSiN layers refined the columns/grains in Cr layers and increased the interface density, contributing to the greatly enhanced irradiation tolerance and mechanical properties. A low average swelling rate of Cr layers was estimated to be ∼0.015 %/dpa after the irradiation of Fe ions at 400 °C. Moreover, the coating became compacted with strengthening columnar boundaries after low-dose irradiation (∼0.8 dpa). Both nanoindentation and micropillar compression test showed the transformation of the deformation mechanism for the multilayer coating, as the irradiated samples relieved stress mainly depending on the plastic deformation under loading, while many cracks formed in the as-deposited ones. Furthermore, in 1200 °C steam, a significantly thinner and denser oxide scale formed on the irradiated Cr/CrAlSiN coating, indicative of improved oxidation resistance. The mechanism of radiation-decelerated oxidation was briefly discussed.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112742"},"PeriodicalIF":7.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303704","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 : 2025-01-26DOI: 10.1016/j.corsci.2025.112737
Solomon-Oshioke Agbedor , Ding Gao , Kaiyang Li , Qian Lei , Aqsa Kanwal , Igbafen Emmanuel Ohiomomo , Shaohua Xing , Jian Hou , Mingxian Sun , Hong Wu
Experimental and computational methods were combined to explore the effects of Cu content on the microstructure, mechanical, and corrosion properties of powder metallurgy (P/M) Ti-Mo-Nb-Ta refractory CCAs. Cu addition refines the grains and significantly improves the strength and work hardening rate. The Cu-free alloy suffered pitting corrosion in Mo-rich regions. Cu addition redistributes Mo and reduces matrix susceptibility to pitting. An electro-dissolution mechanism is proposed and the effect of the alloying elements upon the impedance response is explained. The TMNT-C1.0 specimen exhibited the best corrosion resistance of 26.0 × 103 Ω•cm2 and the least corrosion rate of 0.00396 mm/a compared to the Cu-free specimen. New solid solution oxide complexes were discovered, which act as a protective layer on the Cu-containing specimens. DFT calculation reveals that the mixed oxide complex film is more resistant to Clˉ adsorption, potentially inhibiting corrosion more effectively than the stable Mo2O5/Cl or MoO3/Cl at the pit sites.
{"title":"A significant improvement in corrosion resistance and mechanical properties of Cu-containing nanocrystalline Ti-Mo-Nb-Ta refractory complex concentrated alloy","authors":"Solomon-Oshioke Agbedor , Ding Gao , Kaiyang Li , Qian Lei , Aqsa Kanwal , Igbafen Emmanuel Ohiomomo , Shaohua Xing , Jian Hou , Mingxian Sun , Hong Wu","doi":"10.1016/j.corsci.2025.112737","DOIUrl":"10.1016/j.corsci.2025.112737","url":null,"abstract":"<div><div>Experimental and computational methods were combined to explore the effects of Cu content on the microstructure, mechanical, and corrosion properties of powder metallurgy (P/M) Ti-Mo-Nb-Ta refractory CCAs. Cu addition refines the grains and significantly improves the strength and work hardening rate. The Cu-free alloy suffered pitting corrosion in Mo-rich regions. Cu addition redistributes Mo and reduces matrix susceptibility to pitting. An electro-dissolution mechanism is proposed and the effect of the alloying elements upon the impedance response is explained. The TMNT-C1.0 specimen exhibited the best corrosion resistance of 26.0 × 10<sup>3</sup> Ω•cm<sup>2</sup> and the least corrosion rate of 0.00396 mm/a compared to the Cu-free specimen. New solid solution oxide complexes were discovered, which act as a protective layer on the Cu-containing specimens. DFT calculation reveals that the mixed oxide complex film is more resistant to Clˉ adsorption, potentially inhibiting corrosion more effectively than the stable Mo<sub>2</sub>O<sub>5</sub>/Cl or MoO<sub>3</sub>/Cl at the pit sites.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112737"},"PeriodicalIF":7.4,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176844","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 : 2025-01-25DOI: 10.1016/j.corsci.2025.112723
Zidi Hang , Jian Zhang , Bo Peng , Zhiheng Zhao , Na Jiang , Guoliang Li , Hongyuan Fu , Weibo Zhang , Jinchuan Jie , Yibo Ouyang , Tingju Li
Selective phase corrosion, driven by potential differences between phases is a major concern for NiAl bronze alloys in NaCl solution. The higher addition of Mn inhibits selective phase corrosion by reducing the potential difference between the phases. The NiAl bronze alloy with 4.5 wt% Mn exhibits superior corrosion resistance that the corrosion rate is 67 % lower than that of the Mn-free NiAl bronze alloy after 30d of immersion. In addition, a dense effective protective film forms on the surface of the alloys after immersion, which isolates the matrix from corrosion medium.
{"title":"Enhancing the selective phase corrosion resistance of NiAl bronze in 3.5 % NaCl solution by adding Mn element","authors":"Zidi Hang , Jian Zhang , Bo Peng , Zhiheng Zhao , Na Jiang , Guoliang Li , Hongyuan Fu , Weibo Zhang , Jinchuan Jie , Yibo Ouyang , Tingju Li","doi":"10.1016/j.corsci.2025.112723","DOIUrl":"10.1016/j.corsci.2025.112723","url":null,"abstract":"<div><div>Selective phase corrosion, driven by potential differences between phases is a major concern for NiAl bronze alloys in NaCl solution. The higher addition of Mn inhibits selective phase corrosion by reducing the potential difference between the phases. The NiAl bronze alloy with 4.5 wt% Mn exhibits superior corrosion resistance that the corrosion rate is 67 % lower than that of the Mn-free NiAl bronze alloy after 30d of immersion. In addition, a dense effective protective film forms on the surface of the alloys after immersion, which isolates the matrix from corrosion medium.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112723"},"PeriodicalIF":7.4,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176048","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 : 2025-01-25DOI: 10.1016/j.corsci.2025.112728
Yu-Fei Xie , Jia-Ming Liu , Qian Hu , Shuo Su , Xiuxin Zhang , Xiaopeng Lu , Hong-Qiang Fan , Xian-Zong Wang
To improve the durability of bipolar plates in proton exchange membrane fuel cells, two types of coatings with mixed- and alternating-layers (mix-C/Cr and alt-C/Cr) are comparatively evaluated. Both coating designing strategies meet DOE targets with i0.84 V declining to 0.10 and 0.27 μA·cm−2 and achieving low interfacial contact resistance of 1.14 and 1.01 mΩ·cm2 for mix-C/Cr and alt-C/Cr, respectively. Analysis suggests that alternating-layer prevent the delamination of C layer and contributes to multiple interfaces which polishing the interfacial potential distribution. The results of this study confirm the promise of mixed- and alternating-layer coating strategies for high-performance coatings on bipolar plates.
{"title":"Comparative study of mixed- and alternating-layer C/Cr coated metal bipolar plates under high potentials toward proton exchange membrane fuel cells","authors":"Yu-Fei Xie , Jia-Ming Liu , Qian Hu , Shuo Su , Xiuxin Zhang , Xiaopeng Lu , Hong-Qiang Fan , Xian-Zong Wang","doi":"10.1016/j.corsci.2025.112728","DOIUrl":"10.1016/j.corsci.2025.112728","url":null,"abstract":"<div><div>To improve the durability of bipolar plates in proton exchange membrane fuel cells, two types of coatings with mixed- and alternating-layers (mix-C/Cr and alt-C/Cr) are comparatively evaluated. Both coating designing strategies meet DOE targets with i0.84 V declining to 0.10 and 0.27 μA·cm−2 and achieving low interfacial contact resistance of 1.14 and 1.01 mΩ·cm2 for mix-C/Cr and alt-C/Cr, respectively. Analysis suggests that alternating-layer prevent the delamination of C layer and contributes to multiple interfaces which polishing the interfacial potential distribution. The results of this study confirm the promise of mixed- and alternating-layer coating strategies for high-performance coatings on bipolar plates.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112728"},"PeriodicalIF":7.4,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175883","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 : 2025-01-25DOI: 10.1016/j.corsci.2025.112740
Ze Zhang , Peng Jin , Yuhe Chen , Teng Fei Zhang , Gobinda Gyawali , Xiaozhe Zhu , Gangfei Li , Shihong Zhang
Surface protective coating is crucial for tungsten-copper alloys to prevent corrosion failure in marine applications. In this work, self-organized nanomultilayer AlCrON coatings with alternating nitrogen-rich and oxygen-rich sublayers were fabricated by arc ion plating technology, whose modulation structure was adjusted by altering substrate-rotation mode. AlCrON deposited with 2D rotation exhibits minimum modulation period and superior protective effect in electrochemical, acidic-salt-spray corrosion and tribo-corrosion conditions. No obvious corrosion was observed on AlCrON coated tungsten-copper alloy after acidic-salt-spray exposure for 180 h. Oxygen doping and nano-multilayer interfaces effectively restrained galvanic corrosion, blocked the intrusion of corrosive media and enhanced the corrosion resistance.
{"title":"Enhanced corrosion and tribo-corrosion resistance of self-organized nano-multilayer oxynitride coatings on tungsten copper alloy","authors":"Ze Zhang , Peng Jin , Yuhe Chen , Teng Fei Zhang , Gobinda Gyawali , Xiaozhe Zhu , Gangfei Li , Shihong Zhang","doi":"10.1016/j.corsci.2025.112740","DOIUrl":"10.1016/j.corsci.2025.112740","url":null,"abstract":"<div><div>Surface protective coating is crucial for tungsten-copper alloys to prevent corrosion failure in marine applications. In this work, self-organized nanomultilayer AlCrON coatings with alternating nitrogen-rich and oxygen-rich sublayers were fabricated by arc ion plating technology, whose modulation structure was adjusted by altering substrate-rotation mode. AlCrON deposited with 2D rotation exhibits minimum modulation period and superior protective effect in electrochemical, acidic-salt-spray corrosion and tribo-corrosion conditions. No obvious corrosion was observed on AlCrON coated tungsten-copper alloy after acidic-salt-spray exposure for 180 h. Oxygen doping and nano-multilayer interfaces effectively restrained galvanic corrosion, blocked the intrusion of corrosive media and enhanced the corrosion resistance.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112740"},"PeriodicalIF":7.4,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175888","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 : 2025-01-25DOI: 10.1016/j.corsci.2025.112736
Jian Li , Tao He , Xiang-yang Du , Alexey Vereschaka
In this study, a novel strategy is proposed to address the challenge of balancing strength and corrosion in deformed Al-Zn-Mg-Cu alloys. The alloy was strengthened by equal channel angular pressing (ECAP) and the microstructure was optimized by subsequent retrogression and re-aging (RRA) treatment. The results indicated that the high-density dislocations generated by ECAP in the {111}Al plane further promoted the precipitation of nanoscale η' phases during the RRA process. The total aging time of RRA was further reduced by 62.5 %, and the average size of the precipitates was also reduced from 5.63 nm before RRA to 4.97 nm. Furthermore, RRA resolves the problems of uneven distribution of precipitated phases and elemental segregation during aging of alloys after ECAP. Reducing the maximum intergranular corrosion depth of the alloy from 86.9 µm to 34.2 µm was achieved by a combination of complex corrosion paths provided by the complex corrosion paths and discontinuous grain boundary precipitation phases.
{"title":"Enhancing the corrosion resistance of high-strength Al-Zn-Mg-Cu alloys after equal channel angular pressing by developing retrogression and re-aging strategies","authors":"Jian Li , Tao He , Xiang-yang Du , Alexey Vereschaka","doi":"10.1016/j.corsci.2025.112736","DOIUrl":"10.1016/j.corsci.2025.112736","url":null,"abstract":"<div><div>In this study, a novel strategy is proposed to address the challenge of balancing strength and corrosion in deformed Al-Zn-Mg-Cu alloys. The alloy was strengthened by equal channel angular pressing (ECAP) and the microstructure was optimized by subsequent retrogression and re-aging (RRA) treatment. The results indicated that the high-density dislocations generated by ECAP in the {111}<sub>Al</sub> plane further promoted the precipitation of nanoscale η' phases during the RRA process. The total aging time of RRA was further reduced by 62.5 %, and the average size of the precipitates was also reduced from 5.63 nm before RRA to 4.97 nm. Furthermore, RRA resolves the problems of uneven distribution of precipitated phases and elemental segregation during aging of alloys after ECAP. Reducing the maximum intergranular corrosion depth of the alloy from 86.9 µm to 34.2 µm was achieved by a combination of complex corrosion paths provided by the complex corrosion paths and discontinuous grain boundary precipitation phases.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112736"},"PeriodicalIF":7.4,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176056","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}
Temperature and humidity fluctuations can cause condensation on a PCB surface which creates a continuous electrolyte pathway between two biased connector pads, leading to current leakage and subsequent dendrite growth. The effect of concentric droplet growth and inter-droplet layer on corrosion failure was investigated using a custom-designed test Printed Circuit Board (PCB) under simulated condensing conditions using DC chronoamperometry, in-situ imaging of the growth and coalescence of water droplets and subsequent dendrite growth, along with the COMSOL secondary current model analyzing leak currents for different droplet coalescence morphologies. While the secondary current model has limitations of not incorporating mass transport phenomena, it can still be used to get some insights into factors such as the effect of droplet coalescence on the occurrence of leakage currents, which indicate dendrite growth. Results indicate that for the investigated PCB layout, droplet coalescence is necessary to cause leakage currents and dendrites.
{"title":"Mechanistic Insight into water film formation and subsequent corrosion-linked dendritic growth on PCBs","authors":"Anish Rao Lakkaraju, Jyothsna Murli Rao, Kapil Kumar Gupta, Rajan Ambat","doi":"10.1016/j.corsci.2025.112741","DOIUrl":"10.1016/j.corsci.2025.112741","url":null,"abstract":"<div><div>Temperature and humidity fluctuations can cause condensation on a PCB surface which creates a continuous electrolyte pathway between two biased connector pads, leading to current leakage and subsequent dendrite growth. The effect of concentric droplet growth and inter-droplet layer on corrosion failure was investigated using a custom-designed test Printed Circuit Board (PCB) under simulated condensing conditions using DC chronoamperometry, in-situ imaging of the growth and coalescence of water droplets and subsequent dendrite growth, along with the COMSOL secondary current model analyzing leak currents for different droplet coalescence morphologies. While the secondary current model has limitations of not incorporating mass transport phenomena, it can still be used to get some insights into factors such as the effect of droplet coalescence on the occurrence of leakage currents, which indicate dendrite growth. Results indicate that for the investigated PCB layout, droplet coalescence is necessary to cause leakage currents and dendrites.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112741"},"PeriodicalIF":7.4,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176055","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}
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