Article
Metallurgy & Metallurgical Engineering
Akif Soltan, Matthew S. Dargusch, Zhiming Shi, Fiona Jones, Barry Wood, Darren Gerrard, Andrej Atrens
Summary: This study found that commercial corrosion inhibiting compounds can effectively reduce the corrosion rates of pure Mg and Mg alloys in NaCl solution, with LPS 3 showing the best corrosion inhibition effect. Different inhibitors form barrier films through different mechanisms of chemical adsorption and physical adsorption, which play a key role in reducing corrosion rates.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Multidisciplinary
Li Lei, Zhongyu Cui, Hui Pan, Kun Pang, Xin Wang, Hongzhi Cui
Summary: The microstructure, corrosion behavior, and cytocompatibility of as-cast and extruded Mg-Zn-Mn-(0, 1.5)Sr alloys in Hank's solution were investigated. Extrusion resulted in grain refinement and preferred texture, while distinct features of Sr-free and Sr-containing alloys included an increase in dislocation density and fragmentation of Mg17Sr2, respectively. Extrusion significantly accelerated the corrosion rate of Sr-free alloy, while alloyed Sr eliminated this deterioration process. Sr alloying decreased the corrosion rate and enhanced the cytocompatibility of the extruded Mg-Zn-Mn alloy without affecting the corrosion penetration depth, demonstrating the superiority of Sr alloying for extruded magnesium alloys as implant materials.
Article
Materials Science, Multidisciplinary
Mei-Xuan Li, Cheng Wang, Yi-Jia Li, Da-Wei Wang, Min Zha, Yipeng Gao, Hui-Yuan Wang
Summary: The effect of trace Ce addition on the microstructure evolution and corrosion behavior of dilute Mg-0.6Al-0.5Mn-0.25Ca alloys has been investigated. The addition of Ce resulted in the formation of less noble Al8Mn4Ce and Al11Ce3 phases. Notably, the alloy containing 0.3 wt% Ce exhibited the lowest corrosion rate, attributed to factors such as the low potential difference, compact composite oxide film, and enrichment of Fe.
Article
Chemistry, Physical
Guonan Liu, Jilei Xu, Baojing Feng, Jinhui Liu, Dongqing Qi, Wenzhan Huang, Peixu Yang, Shaojun Zhang
Summary: Adjusting the microstructure through deformation process affects the corrosion behavior of Mg alloys. This study investigated the corrosion performance of extruded and forged WE43 alloys in NaCl solution, and found that the different microstructures resulted in different corrosion behaviors and corrosion resistance.
Article
Materials Science, Multidisciplinary
Yi-Jia Li, Mei-Xuan Li, Zhen-Ming Hua, Bing-Yu Wang, Yipeng Gao, Hui-Yuan Wang
Summary: The effect of Al on microstructure and corrosion behavior of cast Mg-2Zn-xAl-0.5Ca (x = 0, 0.5, 1.0, 2.0 wt%) alloys is investigated. The addition of 0.5 wt% Al leads to the lowest corrosion rate of 4 mm/y. This is attributed to the decreased cathodic activity of Ca2Mg6Zn3 phase due to Al doping and the refined intermetallics resulting from Al alloying, which reduce pitting corrosion. Additionally, the finer grains enhance the barrier effect at grain boundaries, effectively confining corrosion propagation. The formation of Al2O3 reinforces the surface film. The optimum Al content is determined to be 0.5-1.0%, which provides the alloy with admirable corrosion resistance and high ultimate tensile strength.
Article
Electrochemistry
Sankalpita Chakrabarty, J. Alberto Blazquez, Tali Sharabani, Ananya Maddegalla, Olatz Leonet, Idoia Urdampilleta, Daniel Sharon, Malachi Noked, Ayan Mukherjee
Summary: Rechargeable magnesium batteries are attractive due to their high volumetric capacity, low cost, and safety features. Progress in their development includes the introduction of nonaqueous electrolytes enabling reversible electrodeposition of magnesium metal. The study shows the efficacy of carbon coating on the current collector, with Ni@C collector exhibiting higher corrosion pit initiation potential compared to uncoated metallic foils. Improving the anodic stability of current collectors is critical in developing practical rechargeable Mg batteries.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Metallurgy & Metallurgical Engineering
Lei Fan, Juantao Zhang, Hao Wang, Yang Liu, Yu Cui, Cheng Wang, Rui Liu, Dongxiao Xu
Summary: The study revealed that Cl- ions can cause pitting corrosion in aluminum alloy 6063, and the combination of Cl- with Cu2+ or Fe3+ ions can exacerbate this corrosion. Fe3+ accelerates uniform corrosion, while Cu2+ mainly promotes pitting corrosion.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Wei Zhang, Bruce Brown, David Young, Gheorghe Bota, Srdjan Nesic, Marc Singer
Summary: The parametric study identified specific conditions that lead to corrosion of mild steel in marginally sour environments, including temperature, H2S pH, solution pH, and sodium chloride concentration. Transmission electron microscopy revealed a porous layer containing mackinawite and magnetite, with corrosion initiating when the mackinawite layer broke down and exposing the steel surface to corrosive substances, leading to propagation of corrosion due to galvanic coupling.
Article
Chemistry, Physical
Pengfei Ji, Shuguang Liu, Chunbao Shi, Kuixue Xu, Zhenguo Wang, Bohan Chen, Bo Li, YuJing Yang, Riping Liu
Summary: The synergistic effect of Zr addition and grain refinement on the corrosion resistance and pitting corrosion behavior of Ti-Zr-based alloys was evaluated. It was found that Zr addition increases pitting sensitivity while grain refinement improves the stability of the passivation film. In alloys with low Zr content, grain refinement inhibits corrosion pits inside the grains, while in alloys with high Zr content, grain refinement induces small corrosion pits.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Andrey I. Marshakov, Alevtina A. Rybkina
Summary: Considerable fluctuations in the cathodic protection potential under the impact of stray currents lead to local corrosion on steel structures. This paper studies the impact of sign-alternating cyclic polarization on the general and local corrosion of carbon steel and finds that hydrogen absorption by the metal determines the corrosion behavior.
Article
Materials Science, Multidisciplinary
Leticia Cabrera-Correa, Leandro Gonzalez-Rovira, Juan de Dios Lopez-Castro, F. Javier Botana
Summary: Research on localized corrosion of Scalmalloy processed by SLM under certified conditions reveals correlation with intermetallic particles in the microstructure, showing two groups of pits with different repassivation behavior in all samples. Heat treatment does not affect pitting corrosion performance, but slightly increases intergranular corrosion susceptibility.
Article
Metallurgy & Metallurgical Engineering
Jufeng Huang, Guang-Ling Song, Yixing Zhu, Dajiang Zheng, Ziming Wang
Summary: In order to elucidate the mechanism of anodic dissolution of Mg, the hydrogen evolution from pure Mg in acidic solutions under galvanostatic conditions was measured. The results showed that with increasing anodic current density, the cathodic hydrogen evolution rate decreased, while the anodic hydrogen evolution rate increased and some surface areas on the Mg became darker. Based on surface analysis and electrochemical equations, the evolution kinetics of hydrogen from Mg was deduced, and the most probable surface intermediate species that could facilitate anodic Mg dissolution and anodic hydrogen evolution were proposed. This study further develops the model of incomplete film Mg+ dissolution, explains various experimental phenomena, and clarifies misconceptions about the current mechanism.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Metallurgy & Metallurgical Engineering
Jufeng Huang, Guang-Ling Song, Yixing Zhu, Dajiang Zheng, Ziming Wang
Summary: To understand the anodic dissolution of Mg, researchers systematically measured the hydrogen evolution from pure Mg in acidic solutions under galvanostatic conditions. The results showed that as the anodic current density increased, the cathodic hydrogen evolution rate decreased, and the anodic hydrogen evolution rate increased. The study proposed possible surface intermediate active species that could facilitate the anodic Mg dissolution and anodic hydrogen evolution, and clarified misunderstandings of the current mechanism.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Construction & Building Technology
Francesca Vecchi, Lorenzo Franceschini, Francesco Tondolo, Beatrice Belletti, Javier Sanchez Montero, Paolo Minetola
Summary: The study investigated the geometric morphology of pits induced by corrosion in naturally corroded prestressed concrete beams. A new method for evaluating the average pit depth of prestressing strands was proposed, and the pitting factor of the corroded samples was calculated through detailed analysis and classification of the corrosion pits.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Huiyun Tian, Zhongyu Cui, Heng Ma, Peilin Zhao, Maoxin Yan, Xin Wang, Hongzhi Cui
Summary: The effect of electrolyte presence form on the corrosion evolution and stress corrosion cracking (SCC) behavior of E690 steel in the simulated marine environment was investigated. The steel exhibited the highest corrosion rate in splash environment and the lowest corrosion rate in immersion environment due to differences in oxygen availability, rust layer property, and scour stress. γ-FeOOH dominated the rust formed in atmospheric environment, while Fe3O4 prevailed in the splash environment. The steel corroded in splash environment showed the most severe SCC degradation with high pit number density, high maximum pit depth, and high cathodic reaction activity.
Article
Metallurgy & Metallurgical Engineering
Lara Moreno, Marta Mohedano, Raul Arrabal, Endzhe Matykina
Summary: PEO coatings were developed on MgZnxCay alloys for biomedical applications using different treatment times and a novel transparent electrolyte containing Ca, P, Si and F. The study found that Zn-rich intermetallics favor the formation of large voids in the coatings, and Ca, P, F, and Si are successfully incorporated into the coatings. The coatings consist of crystalline phases and amorphous material. Corrosion of the bare substrates can be accelerated by amino acids and organic components in the α-MEM solution, but they have no significant influence on the corrosion resistance of coated specimens. Furthermore, Zn-rich intermetallic particles in the undercoating crevice induce a more aggressive corrosive environment and enhanced micro-galvanic couple effect, leading to faster degradation of the coated alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Metallurgy & Metallurgical Engineering
Morteza Daavari, Masoud Atapour, Marta Mohedano, Hugo Mora Sanchez, Juan Rodriguez-Hernandez, Endzhe Matykina, Raul Arrabal, Aboozar Taherizadeh
Summary: This study investigated the effects of multi-walled carbon nanotubes (MWCNTs) and polycaprolactone (PCL) on the quasi-in vivo corrosion behavior of AZ31B Mg alloy treated by plasma electrolytic oxidation (PEO). The findings reveal that the incorporation of MWCNTs modified the PEO coating, resulting in increased roughness, a thicker inner barrier layer, and reduced hydrophilicity. The PEO and PCT ceramic coatings decreased hydrogen generation, with the PCTPCL6 coating exhibiting the lowest amount of collected hydrogen.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
R. del Olmo, M. Mohedano, E. Matykina, R. Arrabal
Summary: The Ca-Al-Layered Double Hydroxide (Ca-Al-LDH) coating and Ca-Al-LDH-Mn coating were successfully synthesized by in situ growth methodology. Ca-Al-LDH-Mn coating exhibited optimal paint adhesion and the highest long-term corrosion resistance in 3.5 wt% NaCl solution.
Article
Chemistry, Physical
Polina Karlova, Maria Serdechnova, Carsten Blawert, Xiaopeng Lu, Marta Mohedano, Domonkos Tolnai, Berit Zeller-Plumhoff, Mikhail L. Zheludkevich
Summary: In this study, the porosity of PEO coatings on Al- and Mg-based substrates was studied using SEM and computer microtomography. The results showed that microCT was a more appropriate method for porosity evaluation compared to SEM imaging. It was also found that the PEO coating on Al substrate had a lower porosity compared to Mg substrates under the same processing parameters.
Article
Materials Science, Multidisciplinary
Hugo Mora-Sanchez, Florian Pixner, Ricardo Buzolin, Marta Mohedano, Raul Arrabal, Fernando Warchomicka, Endzhe Matykina
Summary: This study investigates, for the first time, the combination of electron beam surface structuring and plasma electrolytic oxidation, aiming to provide a multiscale topography and bioactive surface for Ti6Al4V alloy in biomedical applications. The results show that the electrolytic oxidation process, morphology, and composition of coatings were almost identical regardless of the surface topography. However, the growth rate of coatings was related to specific topographical features. Nevertheless, all the coatings exhibited excellent corrosion resistance.
Article
Metallurgy & Metallurgical Engineering
B. Pillado, B. Mingo, R. del Olmo, E. Matykina, A. M. Kooijman, Y. Gonzalez-Garcia, R. Arrabal, M. Mohedano
Summary: Zinc aluminium (Zn-Al) and lithium aluminium (Li-Al) - layered double hydroxides (LDH) coatings with incorporated inhibitors (Li -, Mo- and W-based) were successfully synthesized on AZ31 Mg alloy. Zn -Al LDH W and Li -Al LDH Li showed the highest corrosion resistance and were selected for further evaluation.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Engineering, Biomedical
Lara Moreno, Cheng Wang, Sviatlana V. Lamaka, Mikhail L. Zheludkevich, Juan Rodriguez-Hernandez, Raul Arrabal, Endzhe Matykina
Summary: In this study, a hybrid hierarchical coating system consisting of plasma electrolytic oxidation (PEO) coating and a homogeneously porous structured polycaprolactone (PCL) top-coat layer loaded with ciprofloxacin (CIP) was developed on Mg3Zn0.4Ca alloy. The HHC system achieved controlled drug release, multi-level protection, and corrosion inhibition by sealing the PEO coating pores, inhibiting corrosive species, and forming insoluble CIP-Me (Mg/Ca) chelates. CIP actively participated in the protection mechanism by interacting with cations coming through the damaged coating.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Gerardo Garces, Pablo Perez, Judit Medina, Rafael Barea, Adrian Gomez, Javier Garcia, Paloma Adeva
Summary: The Mg-2%Nd alloy, after thermal treatment and quenching at 520 degrees C, shows plastic instabilities at intermediate temperatures between 100 and 300 degrees C due to dynamic strain aging caused by the presence of neodymium atoms. The competition between the precipitation of Mg-Nd particles and the DSA phenomenon during compression tests depends on the test temperature. Below 200 degrees C, the formation of neodymium-rich precipitates is slow and the interaction is insignificant, resulting in a normal behavior of the DSA. However, at temperatures above 200 degrees C, the faster formation of neodymium-rich precipitates and the decrease of neodymium in solid solution lead to an inverted evolution of the critical strain with temperature.
Article
Materials Science, Multidisciplinary
Lara Moreno, Marta Mohedano, Raul Arrabal, Juan Rodriguez-Hernandez, Endzhe Matykina
Summary: A hybrid hierarchical coating (HHC) biodegradable system was developed on Mg3Zn0.4Ca alloy and evaluated under quasi-in vivo conditions. The HHC system improves the corrosion resistance by 10-12 times compared to the stand-alone PEO coating and can be further functionalized with pharmaceutical agents due to its inherent porosity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Metallurgy & Metallurgical Engineering
Lara Moreno, Endzhe Matykina, Kiryl A. Yasakau, Carsten Blawert, Raul Arrabal, Marta Mohedano
Summary: The present study aims to evaluate the effect of alloy processing and composition, pH control, and testing medium on the corrosion performance of Mg-Zn-Ca systems for biodegradable implants. Various microscopic methods were used to analyze the grain size and secondary phases. The corrosion performance of the alloys was evaluated using electrochemical and hydrogen evolution methods. The pH control was achieved through daily solution replacement and CO2 flow.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Physical
Morteza Daavari, Ana Conde, Masoud Atapour, Mohsen HosseinpourRokni, Hugo Mora Sanchez, Marta Mohedano, Endzhe Matykina, Raul Arrabal
Summary: The effects of incorporating multi-walled carbon nanotubes (MWCNTs) and posttreating with polycaprolactone (PCL) on the environmental-assisted cracking behavior of a plasma electrolytic oxidation (PEO) coated AZ31B Mg alloy were studied. The results showed that although the PEO coatings (with and without MWCNTs) had a significant positive influence on the bio-electrochemical behavior of the alloy, the improvement in environmental-assisted cracking performance was marginal.
SURFACES AND INTERFACES
(2023)
Article
Engineering, Biomedical
Morteza Daavari, Masoud Atapour, Marta Mohedano, Endzhe Matykina, Raul Arrabal, Dobrila Nesic
Summary: Different coating systems produced via plasma electrolytic oxidation (PEO) can regulate the degradation rate and improve the surface biocompatibility of the AZ31B magnesium alloy. The smooth and homogenous surface of the PEO + CNT/PCL coating can decrease magnesium corrosion and enhance biological functionality.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(2023)
