Corrosion最新文献_第4页

Microstructures and properties of FeCoNiCr high-entropy alloy coatings prepared by electrodeposition 电沉积制备的铁钴镍铬高熵合金镀层的微观结构和性能

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-02-02 DOI: 10.5006/4493

Xiang Ju, Chuanbo Zheng, Tianyi Lv, Hongbo Ju, Han Ma, Dianchun Ju, Jiming Zhang, Kaifei Gong, Bowen Li, Xiaotian Wang, Wenkai Zou

{"title":"Microstructures and properties of FeCoNiCr high-entropy alloy coatings prepared by electrodeposition","authors":"Xiang Ju, Chuanbo Zheng, Tianyi Lv, Hongbo Ju, Han Ma, Dianchun Ju, Jiming Zhang, Kaifei Gong, Bowen Li, Xiaotian Wang, Wenkai Zou","doi":"10.5006/4493","DOIUrl":"https://doi.org/10.5006/4493","url":null,"abstract":"\u0000 High-entropy alloys (HEAs) have attracted increasing attention owing to their multi-component characteristics with notable high entropy effects. However, obtaining HEAs with improved properties is still challenging. The properties of HEAs can be modulated by the fabrication technique. Electrodeposition could achieve the desired performance characteristics of HEA coatings while operating at reduced processing temperatures and energy consumption levels. Herein, novel FeCoNiCr HEA coatings were electrodeposited on copper substrates under various current densities. The microstructure, coating thickness, hardness, wear resistance, and corrosion properties of the FeCoNiCr HEA coatings prepared at different current densities were all examined. X-ray diffraction (XRD) revealed HEA coatings with a single disordered face-centered cubic (FCC) solid solution phase. Scanning electron microscopy (SEM) indicated uniform and dense surface of FeCoNiCr HEA coatings fabricated under a current density of 25 A/dm2, with significantly reduced coating cracking and improved structural integrity. The coatings prepared at 25A/dm2 also exhibited maximum thickness and favorable bonding with the substrate, as well as notably enhanced wear resistance. As the preparation current density increases, the hardness of the coating increases. The hardness of the coating reaches its maximum at 30A/dm2. FeCoNiCr HEA coatings fabricated under a current density of 25 A/dm2 in a 3.5 wt% NaCl solution simulated seawater conditions demonstrated improved electrochemical resistance to corrosion. By comparing the microstructure, Elemental content and properties of coatings prepared at various current densities, it was found that the FeCoNiCr high entropy alloy coating prepared at 25A/dm2 showed the best performance.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139810021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructures and properties of FeCoNiCr high-entropy alloy coatings prepared by electrodeposition 电沉积制备的铁钴镍铬高熵合金镀层的微观结构和性能

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-02-02 DOI: 10.5006/4493

Xiang Ju, Chuanbo Zheng, Tianyi Lv, Hongbo Ju, Han Ma, Dianchun Ju, Jiming Zhang, Kaifei Gong, Bowen Li, Xiaotian Wang, Wenkai Zou

{"title":"Microstructures and properties of FeCoNiCr high-entropy alloy coatings prepared by electrodeposition","authors":"Xiang Ju, Chuanbo Zheng, Tianyi Lv, Hongbo Ju, Han Ma, Dianchun Ju, Jiming Zhang, Kaifei Gong, Bowen Li, Xiaotian Wang, Wenkai Zou","doi":"10.5006/4493","DOIUrl":"https://doi.org/10.5006/4493","url":null,"abstract":"\u0000 High-entropy alloys (HEAs) have attracted increasing attention owing to their multi-component characteristics with notable high entropy effects. However, obtaining HEAs with improved properties is still challenging. The properties of HEAs can be modulated by the fabrication technique. Electrodeposition could achieve the desired performance characteristics of HEA coatings while operating at reduced processing temperatures and energy consumption levels. Herein, novel FeCoNiCr HEA coatings were electrodeposited on copper substrates under various current densities. The microstructure, coating thickness, hardness, wear resistance, and corrosion properties of the FeCoNiCr HEA coatings prepared at different current densities were all examined. X-ray diffraction (XRD) revealed HEA coatings with a single disordered face-centered cubic (FCC) solid solution phase. Scanning electron microscopy (SEM) indicated uniform and dense surface of FeCoNiCr HEA coatings fabricated under a current density of 25 A/dm2, with significantly reduced coating cracking and improved structural integrity. The coatings prepared at 25A/dm2 also exhibited maximum thickness and favorable bonding with the substrate, as well as notably enhanced wear resistance. As the preparation current density increases, the hardness of the coating increases. The hardness of the coating reaches its maximum at 30A/dm2. FeCoNiCr HEA coatings fabricated under a current density of 25 A/dm2 in a 3.5 wt% NaCl solution simulated seawater conditions demonstrated improved electrochemical resistance to corrosion. By comparing the microstructure, Elemental content and properties of coatings prepared at various current densities, it was found that the FeCoNiCr high entropy alloy coating prepared at 25A/dm2 showed the best performance.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139870099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Construction and optimization of corrosion map in a broad region of acidic soil via machine learning 通过机器学习构建和优化广阔酸性土壤区域的腐蚀地图

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-01-24 DOI: 10.5006/4498

Hui Su, Jun Wang, Yuxing Zeng, Chenmeng Dang, Yi Xie, Song Xu, Yongli Huang, Zhi Li, Tangqing Wu

{"title":"Construction and optimization of corrosion map in a broad region of acidic soil via machine learning","authors":"Hui Su, Jun Wang, Yuxing Zeng, Chenmeng Dang, Yi Xie, Song Xu, Yongli Huang, Zhi Li, Tangqing Wu","doi":"10.5006/4498","DOIUrl":"https://doi.org/10.5006/4498","url":null,"abstract":"\u0000 Machine learning has been widely applied to exploring the key affecting factors for metal corrosion in some local regions. However, there is a lack of systemic research and practicable prediction model for the metal corrosion in a broad region. In this paper, the corrosion map of Q235 steel in a broad region of acidic soils of Hunan province of Central China was constructed and optimized via the field experiment and machine learning. Both the experimental and optimized corrosion maps confirmed that the corrosion rate of the steel decreased from the western to the eastern part of the province. The concentrations of pH, F−, Cl−, NO3−, HCO3−, K+ and Mg2+ were the key affecting factors in the broad region of acidic soils of the province. Among them, the contribution rate of the HCO3− concentration was higher than that of other factors. The optimization model based on the ordinary least squares could be used for the optimization of the corrosion map of steels a broad region of acidic soils. The optimized corrosion map was a good alternative of the estimation methods for the corrosion rate of steels in soil.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139599767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Localized Corrosion Resistance of Nickel Alloy 718 In Chloride-Containing Environments 镍合金 718 在含氯化物环境中的局部抗腐蚀性能

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-01-24 DOI: 10.5006/4459

A. Reyad, M. S. Hazarabedian, Yang Hou, E. Hornus, Mariano Iannuzzi

{"title":"Localized Corrosion Resistance of Nickel Alloy 718 In Chloride-Containing Environments","authors":"A. Reyad, M. S. Hazarabedian, Yang Hou, E. Hornus, Mariano Iannuzzi","doi":"10.5006/4459","DOIUrl":"https://doi.org/10.5006/4459","url":null,"abstract":"\u0000 Resistant to aggressive reducing environments and combining excellent mechanical properties, the age-hardenable Alloy 718 is the most broadly used nickel alloy in the oil and gas industry. Nevertheless, its localized corrosion resistance in oxidizing halide-containing environments has yet to be thoroughly investigated, with conflicting results discussed in the literature. In this regard, Alloy 718 has a relatively low pitting resistance equivalent (PRE), limiting in practice its use where localized corrosion is expected, particularly in seawater applications. This work quantified the localized corrosion resistance of the alloy in chloride-containing environments. The potentiodynamic-galvanostatic-potentiodynamic (PD-GS-PD) technique was used to determine the crevice corrosion repassivation potential (ER, CREV) in deaerated natural seawater at different temperatures for two Alloy 718 grades (i.e., aerospace, as per ASTM B670, and oil and gas, as per API 6ACRA, grades). Additionally, potentiodynamic polarization testing was conducted for the API 6ACRA grade in acidified solutions with varying chloride concentrations to simulate pit/crevice-like conditions. In the aerospace heat treatment condition, Alloy 718 suffered crevice corrosion at temperatures as low as 10°C, while the API 6ACRA grade remained unaffected at the same testing temperature. Stable crevice corrosion occurred at 20°C and 50°C for both grades.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139602423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Considerations to avoid corrosion rate estimate error of the reinforcing steel if it is based only on concrete’s electrical resistivity. 如果仅根据混凝土的电阻率来估算钢筋的腐蚀率，则应考虑避免出现腐蚀率估算误差。

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-01-23 DOI: 10.5006/4482

A. Torres‐Acosta

{"title":"Considerations to avoid corrosion rate estimate error of the reinforcing steel if it is based only on concrete’s electrical resistivity.","authors":"A. Torres‐Acosta","doi":"10.5006/4482","DOIUrl":"https://doi.org/10.5006/4482","url":null,"abstract":"\u0000 In recent years, the use of electrical resistivity (ρ) of concrete as a design parameter has intensified, ranging from its use as a durability index in laboratories for the characterization of cement-based materials, as well as in inspection of existing structures, in order to diagnose the pathological problems they present. It has also being used as a durability index to accept or reject a concrete mixture during the construction of concrete infrastructure that it should comply as a durable concrete mixture. ρ of concrete has also been used as an indirect measure of the corrosion rate (icorr) of the embedded steel in concrete to determine not only the time of corrosion initiation, but also the propagation time of corrosion of reinforcing or prestressing steel. This allows indirect measurements of icorr from ρ measurements on the concrete surface without the need to connect the reinforcing or prestressing steel to the measuring equipment. The present investigation presents some results from the literature that corroborate this direct correlation between ρ of concrete and icorr of the embedded steel for some exposure conditions, and some considerations are discussed to avoid possible measurement interpretation errors if this correlation is used in real structures.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139605678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrochemical Evaluation of Al-5 wt% Zn Metal Rich Primer for Protection of Al-Zn-Mg-Cu Alloy in NaCl 用于在氯化钠中保护铝-锌-镁-铜合金的 Al-5 wt% 富锌金属底漆的电化学评估

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-01-18 DOI: 10.5006/4424

A. Korjenic, L. Blohm, A. Druschitz, J. R. Scully

{"title":"Electrochemical Evaluation of Al-5 wt% Zn Metal Rich Primer for Protection of Al-Zn-Mg-Cu Alloy in NaCl","authors":"A. Korjenic, L. Blohm, A. Druschitz, J. R. Scully","doi":"10.5006/4424","DOIUrl":"https://doi.org/10.5006/4424","url":null,"abstract":"\u0000 An intact and X-scribed Al-5wt%Zn rich primer (AlRP) without pretreatment or topcoat was evaluated for its ability to suppress potential dependent intergranular corrosion (IGC) and intergranular stress corrosion cracking (IGC-SCC) of peak aged AA7075A-T651 in NaCl salt fog and full immersion. The ability of the primer to provide sacrificial anode-based cathodic prevention of peak aged AA7075-T651 substrate was evaluated both under the primer coating and at scratches. The AlRP evaluated consisted of an epoxy-based resin embedded with spherical Al-5wt%Zn pigment particles. Performance was evaluated under full immersion in 0.6 M NaCl solution and compared to ASTM B-117 salt spray exposure using two approaches. These consisted of the University of Virginia (UVa) cycle test on intact coatings and the full immersion galvanic couple testing on simulated scratched panels created when intact coatings form bimetal couples with bare AA7075-T651. Focus was placed on the ability of the AlRP to achieve a targeted intermediate galvanic couple potential near a “prevention” potential which suppresses stress corrosion crack growth, intermetallic particle corrosion as well as intergranular corrosion. The long term (24-hour) open circuit potential (OCP) of AlRP coated AA7075-T651 in 0.6 M NaCl indicated that the AlRP provided less than 100mV of cathodic potential shift of the intact coating from its OCP. Electrochemical cycle testing conducted at −0.95 VSCE demonstrates that the AlRP did not enable sacrificial anode-based cathodic protection as the coupled potential remained at the corrosion potential of bare AA7075-T651. Furthermore, the current observed throughout galvanic corrosion experiments coupling of AlRP:AA7075-T651 indicated the AlRP coating was a cathode in the bimetal galvanic couple. ASTM B117 salt spray exposure of the AlRP revealed oxidation of the AA 7075-T651 substrate below the primer detected as a continually growing oxygen signal at the primer-substrate interface that did not arrest corrosion over the exposure period.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139615867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stress Corrosion Cracking of High-Strength Ni-Base Alloys in PWR Primary Water Containing KOH vs. LiOH 高强度镍基合金在含 KOH 与 LiOH 的压水堆原水中的应力腐蚀裂纹

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-01-16 DOI: 10.5006/4460

Z. Zhai, Ferdinan Cintron-Colon, Ryan A. Bouffioux, M. Toloczko

引用次数: 0

Predicting Microbiologically Influenced Concrete Corrosion in Self-cleansing Sewers using Meta-learning Techniques 利用元学习技术预测自净式下水道中受微生物影响的混凝土腐蚀情况

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-01-16 DOI: 10.5006/4457

Mohammad Zounemat-Kermani, Ammar Aldallal

{"title":"Predicting Microbiologically Influenced Concrete Corrosion in Self-cleansing Sewers using Meta-learning Techniques","authors":"Mohammad Zounemat-Kermani, Ammar Aldallal","doi":"10.5006/4457","DOIUrl":"https://doi.org/10.5006/4457","url":null,"abstract":"\u0000 Sewer networks are not only necessary as an infrastructure for human societies, but they can also help humans achieve a stable situation with the surrounding natural environment by controlling and preventing the spread of pollution in the environment. As a result, concrete sewer maintenance and analysis of their damaging elements are critical. In this regard, modeling microbiologically influenced corrosion (MIC) is a challenging phenomenon. Due to the complicated aspects related to the interaction of microorganisms and concrete degradation, this research suggests several machine-learning models as well as traditional multiple linear regression (MLR) model to predict the MIC in sewer pipelines. The models can be categorized into three sections: (i) stand-alone models (GMDH, GRNN, RBFNN, MLPNN, CHAID, and CART), (ii) integrative models (ANFIS and SVR with PSO, ABC and FA) and (iii) ensemble meta-learner Stepwise Regression model. After implementing the models, statistical measures, including RMSE, MAE, MBE, PCC, and Nash–Sutcliffe model efficiency (NSE) are considered for evaluating models' performances. The results indicate that the ensemble Meta-learner-SR model is significantly more precise than other models. They also demonstrate that using an integrative model can improve the accuracy of stand-alone models by at least up to 42 percent. The durability and lifespan of the sewer system is also estimated by the aid of the best predictive model (Meta-learner-SR) for two scenario cases of (i) gas phase and (ii) submerged conditions. It is concluded that the sewer systems have a considerably lower life span (24 years less) exposed to submerged sewage than the gas phase with 56 years of durability.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139528666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization using point defect theory of the microstructure effect on passivity stability in austenitic stainless steel 利用点缺陷理论表征微结构对奥氏体不锈钢钝化稳定性的影响

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-01-16 DOI: 10.5006/4365

R. Case, H. Castaneda, Y. Ding, D. Narayanan, A. Khan, M. Cedeño, G. Peña

{"title":"Characterization using point defect theory of the microstructure effect on passivity stability in austenitic stainless steel","authors":"R. Case, H. Castaneda, Y. Ding, D. Narayanan, A. Khan, M. Cedeño, G. Peña","doi":"10.5006/4365","DOIUrl":"https://doi.org/10.5006/4365","url":null,"abstract":"\u0000 The influence of the microstructure on the resistance to pitting potential in austenitic stainless steel UNS N31603 is evaluated to explain the effect of the distribution of features such as carbides. Different microstructures were obtained by processing, via surface laser melting (SLM) and sensitized at 600°C, 700°C and 800°C. The test solution used for electrochemical testing included a buffer pH 8 brine at room conditions.\u0000 The characterization of the passive conditions is done by using potentiodynamic, potentiostatic and Mott Schottky techniques. The results show that the UNS N31603 samples produced by SLM have higher passive layer stability. The correlation with the microstructural features attribute this to a lack of inclusions and carbides characteristic of the SLM process. The analysis of the experimental results using the point defect model description of the passive layer behavior indicates that the stability of the passive layer is a priori inversely proportional to both the metal cation and anion vacancy diffusivities. Experiments reveal the close dependence and explain the properties of the passive layer with respect to a Point defect model.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139620149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of graphene on corrosion resistance of low zinc epoxy coatings applied to low-carbon steel 石墨烯对低碳钢低锌环氧涂层耐腐蚀性的影响

IF 1.6 4区材料科学

Corrosion Pub Date : 2024-01-09 DOI: 10.5006/4435

引用次数: 0