Materials and Corrosion最新文献

Causal discovery to understand hot corrosion 发现原因，了解热腐蚀

Materials and Corrosion Pub Date : 2024-02-12 DOI: 10.1002/maco.202314240

Akhil Varghese, Miguel Arana‐Catania, S. Mori, A. Encinas-Oropesa, Joy Sumner

引用次数: 0

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Materials and Corrosion Pub Date : 2024-02-09 DOI: 10.1002/maco.202470034

引用次数: 0

Identification of carbonation‐induced corrosion of steel in concrete by electrochemical testing 通过电化学测试识别混凝土中碳化引起的钢腐蚀

Materials and Corrosion Pub Date : 2024-02-08 DOI: 10.1002/maco.202414272

Samanbar Permeh, K. Lau

{"title":"Identification of carbonation‐induced corrosion of steel in concrete by electrochemical testing","authors":"Samanbar Permeh, K. Lau","doi":"10.1002/maco.202414272","DOIUrl":"https://doi.org/10.1002/maco.202414272","url":null,"abstract":"Carbonation‐induced corrosion of steel in concrete can allow for premature degradation of structures. Corrosion probes in health monitoring systems can assess concrete carbonation and steel corrosion rates. The electrochemical noise (EN) technique has advantages for corrosion sensing. Instrumented concrete columns were fitted with a carbonation chamber for accelerated testing. EN was assessed through statistical evaluation of noise time signatures, noise resistance, and spectral analysis. The mean noise potential for the electrodes showed electronegative potential and correspondingly high rms noise current, indicative of corrosion activation in carbonated concrete. The estimated corrosion rates obtained from the noise impedance were comparable to those resolved from the polarization resistance and noise resistance. The shot noise analysis indicated isolated spontaneous noise events associated with the activation of local steel anodes. The outcomes of the testing indicate that the placement of low‐cost sensors and passive EN measurements can be used to monitor the onset of carbonation‐induced corrosion of steel in concrete and provide estimates on corrosion rates.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"37 9-10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139853494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

13C isotopic labeling to decipher the iron corrosion mechanisms in a carbonated anoxic environment 利用 13C 同位素标记破译碳酸缺氧环境中的铁腐蚀机制

Materials and Corrosion Pub Date : 2024-02-06 DOI: 10.1002/maco.202314203

Hélène Lotz, D. Neff, F. Mercier‐Bion, C. Bataillon, Nicolas Nuns, P. Dillmann

{"title":"13C isotopic labeling to decipher the iron corrosion mechanisms in a carbonated anoxic environment","authors":"Hélène Lotz, D. Neff, F. Mercier‐Bion, C. Bataillon, Nicolas Nuns, P. Dillmann","doi":"10.1002/maco.202314203","DOIUrl":"https://doi.org/10.1002/maco.202314203","url":null,"abstract":"A two‐step corrosion experiment was performed on a ferritic steel (Armco) in a synthetic solution representing the Callovo–Oxfordian at 120°C. After the development of a carbonated corrosion product layer (CPL) during the first 15 days of the experimental step, corrosion front progression was investigated using 13C marked carbonate species during the second 15 days experimental step. CPL was characterized at each step, in terms of morphology (scanning electron microscopy), composition (energy‐dispersive spectroscopy), and structure (µ‐Raman). 13C corrosion product locations were analyzed by time‐of‐flight secondary ion mass spectrometry. Results evidenced that after a step of generalized corrosion, iron corrosion continues locally at the metal/CPL interface. These results suggest that although a protective siderite layer formed on the iron surface after 15 days, a local dissolution of the carbonate layer at the M/CPL interface occurred. A galvanic effect is developed between the bared surface (anode) and the covered one (cathode). This activates iron oxidation. The precipitation of carbonate corrosion products to the metal/CPL interface is possible by the diffusion of 13CO32− ions from the bulk through the siderite layer.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139860651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Workability and corrosion behavior studies on sintered iron‐based hybrid powder metallurgy alloys 烧结铁基杂化粉末冶金合金的可加工性和腐蚀行为研究

Materials and Corrosion Pub Date : 2022-11-01 DOI: 10.1002/maco.202213268

Kathhi Palaksha Reddy, Thanjavur Krishnamoorthi Kandavel, Selvaraj Nelson Raja

{"title":"Workability and corrosion behavior studies on sintered iron‐based hybrid powder metallurgy alloys","authors":"Kathhi Palaksha Reddy, Thanjavur Krishnamoorthi Kandavel, Selvaraj Nelson Raja","doi":"10.1002/maco.202213268","DOIUrl":"https://doi.org/10.1002/maco.202213268","url":null,"abstract":"Sintered low carbon steels are developed using prealloyed and elemental powders to improve the mechanical properties of powder metallurgy and powder forged parts. The research focuses on the mechanism of workability and corrosion studies on sintered preforms of Alloy 1 (ATOMET4601 + 0.35%C) and Alloy 2 (ATOMET4601‐0.35%C‐0.25%Mn‐0.1%Si‐0.9%Cr). Sintered preforms of relative densities of 81%, 84%, and 90% were used for the present work. The preforms with 84% relative density have been used to study the formability parameters. It is observed from the experimental study that the Alloy 2 preforms with the addition of alloying elements have undergone lesser densification and deformation due to the work hardening mechanism. Corrosion studies have been carried out by conducting aqueous immersion and electrochemical corrosion tests on these two alloys using 18% HCl solution at different timings. It is found that the Alloy 2 has exhibited a better corrosion resistance than the Alloy 1 due to the addition of various alloying elements. It is also observed that the corrosion rate has decreased with an increase in densification irrespective of the alloys. The microstructures, scanning electron microscopy, and X‐ray diffraction of corroded surfaces have been corroborated with densification and the corrosion behavior of alloys.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"92 1","pages":"1854 - 1864"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81609494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inhibitory effect of cysteine and lanthanides on AA7075‐T6 in neutral NaCl solution 半胱氨酸和镧系元素对中性NaCl溶液中AA7075‐T6的抑制作用

Materials and Corrosion Pub Date : 2022-11-01 DOI: 10.1002/maco.202213330

Jovana Pejić, Bojana M. Radojković, Dunja Marunkić, B. Jegdić, S. Stevanović, Milena Milošević, J. Bajat

{"title":"Inhibitory effect of cysteine and lanthanides on AA7075‐T6 in neutral NaCl solution","authors":"Jovana Pejić, Bojana M. Radojković, Dunja Marunkić, B. Jegdić, S. Stevanović, Milena Milošević, J. Bajat","doi":"10.1002/maco.202213330","DOIUrl":"https://doi.org/10.1002/maco.202213330","url":null,"abstract":"The inhibitory effect of cysteine in the presence of selected lanthanide chlorides (LaCl3, NdCl3, and CeCl3) in a neutral 0.1 M NaCl solution was analyzed. The cysteine concentration of 0.3 mM was determined as an optimal one. The resistance to general and pitting corrosion of AA7075‐T6 alloy in inhibitive solutions was determined using electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The surface appearance of the aluminum alloy was determined before and after corrosion tests using scanning electron microscopy/energy dispersive spectroscopy, while the presence of an inhibitory layer on the alloy surface was confirmed by X‐ray photoelectron spectroscopy analysis and atomic force microscopy. The inhibitory effect of cysteine was significantly higher in the presence of all tested lanthanide chlorides, especially to pitting corrosion. The protective ability of cysteine was increased by lanthanides in the following sequence: Ln < Nd < Ce ions. The inhibitory effect of cysteine in the presence of cerium ions was examined in more detail as cerium ions provided the highest inhibitory effect, both to general and pitting corrosion.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"15 1","pages":"1800 - 1812"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79121219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Micro‐galvanic corrosion of duplex stainless steel annealed at different temperatures evaluated by experiments and a numerical simulation model 通过实验和数值模拟模型研究了双相不锈钢在不同温度下的微电偶腐蚀

Materials and Corrosion Pub Date : 2022-08-03 DOI: 10.1002/maco.202213297

Xin Cao, Xiaojun Hu

引用次数: 0

Increasing corrosion resistance of AISI 1010 steel by boride coatings 硼化物涂层提高AISI 1010钢的耐蚀性

Materials and Corrosion Pub Date : 2022-08-01 DOI: 10.1002/maco.202213326

S. U. Bayça, O. Bican

{"title":"Increasing corrosion resistance of AISI 1010 steel by boride coatings","authors":"S. U. Bayça, O. Bican","doi":"10.1002/maco.202213326","DOIUrl":"https://doi.org/10.1002/maco.202213326","url":null,"abstract":"Boriding is the process of coating the metal surface with a ceramic metal boride layer by the diffusion method. Iron borides, one of the metal borides, are called ceramics because they are covalently bonded compounds. Iron boride coatings contain strong Fe–B and B–B covalent bonds. In this study, the effect of boronizing on the corrosion resistance of AISI 1010 steel was investigated. Baybora‐1 which has recently been patented was used as boronizing agent. AISI 1010 steel was borided at 950°C for 2, 4, and 6 h using the solid method. The microstructure, hardness, and corrosion rate of the samples were investigated. The change in the corrosion rate of the samples was determined by the corrosion test specified in the ASTM G31‐72 standard. The results showed that the hardness of the iron boride layer formed on the surface as a result of the boronizing process was greater than that of the matrix. As a result of the boriding process, the hardness of the iron boride layer on the steel surface reached approximately eight times the hardness of the substrate matrix. The thickness of the iron boride layer on the steel sample surface was measured at 950°C for 2 and 6 h, respectively, as 45 ± 12 and 155 ± 13 µm. It was concluded that the boriding process increased the corrosion resistance of steel.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"35 1","pages":"2032 - 2040"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85528670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Electrochemical characterization of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy in different pH environments 新型多组分Al75Mg5Li10Zn5Cu5低熵合金在不同pH环境下的电化学表征

Materials and Corrosion Pub Date : 2022-08-01 DOI: 10.1002/maco.202213103

P. Sudha, K. Tun, M. Gupta, A. Mourad, S. Vincent

{"title":"Electrochemical characterization of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy in different pH environments","authors":"P. Sudha, K. Tun, M. Gupta, A. Mourad, S. Vincent","doi":"10.1002/maco.202213103","DOIUrl":"https://doi.org/10.1002/maco.202213103","url":null,"abstract":"The corrosion behavior and microstructure of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy (Al LEA) were investigated in different Cl− ion concentrations of acidic (HCl), neutral (NaCl), and alkaline (NaOH) media. The study was performed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The surface morphologies and chemical composition were examined by using a scanning electron microscope with energy‐dispersive X‐ray spectroscopy. The results indicated that with the increase of the Cl− ion concentrations, the degradation rate with more pits and cracks was observed in both acidic and neutral media. This is due to the breakdown of Al(OH)3/Al2O3 passive layer. In an alkaline medium, increasing of pH value from pH 8 to pH 12, there was a slight increment in corrosion rate (CR). However, the corrosion trend was not witnessed on alloy surfaces because of the formation of Mg32(Al, Zn)49 and AlCu phases, which are more stable than α‐Al. The order of Al‐LEA CR is found to be HCl > NaCl > NaOH. The results obtained from the polarization and EIS were in good agreement with each other.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"64 1","pages":"2071 - 2083"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77890037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing corrosion resistance of magnesium alloy by rGO/Mg(OH)2 composite coating rGO/Mg(OH)2复合涂层增强镁合金耐腐蚀性能

Materials and Corrosion Pub Date : 2022-07-29 DOI: 10.1002/maco.202213360

Jing Yuan, Xiaofeng Cui, Rui Yuan, Qiushi Li, Xuerong Zheng

引用次数: 1