Article
Materials Science, Ceramics
Leonardo Hernandez, Jesus E. Gonzalez, Violeta Barranco, Yaymarilis Veranes-Pantoja, J. C. Galvan, Geonel Rodriguez Gattorno
Summary: The study focused on depositing bioactive hydroxyapatite coatings on pure magnesium surfaces using a modified biomimetic deposition method. Different preparation parameters were adjusted to achieve HAp and/or doped apatite coatings with varying characteristics. Results showed that the behavior of the coatings depended on both the type of surface pre-treatment and the immersion time in the supersaturated calcification solution (SCS).
CERAMICS INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
K. S. Duran, N. Hernandez, L. M. Rueda, C. A. Hernandez-Barrios, A. E. Coy, F. Viejo
Summary: This study developed multilayer barrier-bioactive coatings to enhance the corrosion resistance of magnesium alloy and promote the growth of apatite-like phases. However, an increase in salt content led to the formation of porous coatings, affecting the corrosion resistance of magnesium alloy.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Multidisciplinary
Jing Wang, Ning Wang, Mengnan Liu, Chengyue Ge, Baorong Hou, Guichang Liu, Wen Sun, Yiteng Hu, Yanli Ning
Summary: The addition of hexagonal boron nitride fillers into poly(vinyl butyral) coatings improves the corrosion protection performance of copper due to non-covalent interactions between the fillers and PVB molecules. The BN-reinforced PVB coating shows significantly higher corrosion resistance compared to pristine PVB coating, providing a long-term protective barrier for the copper substrate. Increasing the loading of h-BN fillers in PVB enhances the corrosion protection performance without accelerating copper corrosion when the coating is damaged.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
M. Daroonparvar, A. Helmer, A. M. Ralls, A. K. Kasar, M. U. Farooq Khan, P. L. Menezes, M. Misra, S. Shao, R. K. Gupta
Summary: Cold sprayed commercially pure Al-based coatings were applied on Mg-based alloys at different N2 gas temperatures. The porosity percentage of the coatings decreased and the flattening ratio increased as the N2 gas temperature decreased, due to in-situ tamping densification. This resulted in a noticeable reduction in wear rate of the Al-based coatings.
Article
Materials Science, Multidisciplinary
K. S. Duran, C. A. Hernandez-Barrios, A. E. Coy, F. Viejo
Summary: Fluoride-based pretreatment of the WE54 magnesium alloy can improve the corrosion resistance of the sol-gel coatings and alloy, but long pretreatment times may lead to structural defects that accelerate corrosive attack in saline environments.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Francisco R. Rangel-Olivares, Elsa M. Arce-Estrada, Roman Cabrera-Sierra
Summary: Polymer nanocomposites consisting of polyaniline (PANI) and metal oxide nanoparticles (SiO2, CeO2, and TiO(2)A) were synthesized through in situ chemical oxidative polymerization. The incorporation of metal oxide nanoparticles into the polymer matrix enhanced the thermal resistance and anti-corrosion properties of the coatings. Among the coatings, those made with TiO(2)A NPs exhibited the best anti-corrosion performance.
Article
Materials Science, Ceramics
M. Ostapiuk
Summary: Magnesium alloys have attracted significant interest in various industries, especially the aviation sector. The innovative combination of a composite layer with carbon fibers encourages detailed analysis of the corrosive behavior of chemically different material connections. Prior to joining, the corrosion behavior of magnesium alloys must be examined.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2021)
Article
Chemistry, Applied
Flavio de Sousa Santos, Almir Spinelli, Nico Scharnagl, Thiago Ferreira da Conceicao
Summary: This study investigated the properties of pectin coatings crosslinked with Ba2+ or Ca2+ ions on AZ31 magnesium alloy, and found that the coatings crosslinked with Ba2+ exhibited better swelling resistance and corrosion protection. These results indicate that pectin is a suitable polymer for preparing efficient, sustainable, and biodegradable coatings for magnesium alloys.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Materials Science, Multidisciplinary
A. S. Gnedenkov, S. Lamaka, S. L. Sinebryukhov, D. Mashtalyar, V. S. Egorkin, I. M. Imshinetskiy, M. L. Zheludkevich, S. Gnedenkov
Summary: The composite calcium-phosphate coating on MA8 Mg alloy, modified with superdispersed polytetrafluoroethylene using electrophoretic deposition, decreases electrochemical activity of the sample in minimum essential medium and ensures the material biocompatibility.
Article
Materials Science, Multidisciplinary
Jiapeng Sun, Bingqian Xu, Zhenquan Yang, Feihu Jiang, Keke Yang, Jing Han, Guosong Wu
Summary: A hierarchal micro-nano beta phase framework is proposed to improve the barrier effect of the second phase in high-aluminum-containing Mg-Al alloy, which effectively mitigates corrosion due to the formation of a brick-and-mortar structured corrosion product layer.
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
Materials Science, Multidisciplinary
Florina Branzoi, Adriana Baran, Simona Petrescu
Summary: In this study, a new composite polymer coating N-methylpyrrole-Triton-X100/N, N,N-diethylaniline (NMPY-TRX100/NNDEA) was synthesized on carbon steel type OL 37 electrode for corrosion protection using an electrodeposition method. The surfactant Triton-X100 played a significant role in improving the corrosion protection performance of the composite by impeding the penetration of corrosive ions. The PNMPY-TRX100/PNNDEA coatings exhibited good anticorrosion protection of OL 37 in corrosive solutions, with corrosion rates around nine times lower than uncoated electrodes and a corrosion protection yield of over 90%.
Article
Chemistry, Applied
Carlos Henrique Michelin Beraldo, Almir Spinelli, Nico Scharnagl, Thiago Ferreira da Conceicao
Summary: This paper investigates the influence of different amounts of phosphoric acid on the protective properties of phosphorylated PVA (PPVA) coatings on a Mg AZ31 alloy. The PPVA coatings and free-standing films were characterized and analyzed. The results demonstrate that PPVA coatings show interesting anticorrosion properties and can be considered as water-based alternatives to polysaccharide coatings.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Michael Schneider, Uta Gierth, Lenka Simunkova, Paul Gierth
Summary: This study focused on investigating the degradation of screen-printed epoxy coatings on printed circuit boards under multiple corrosion loads using the pressure cooker test. The approach utilized electrochemical impedance spectroscopy and Fourier-transformed infrared spectroscopy to study the change in electrochemical behavior and molecular structure of the polymer. The results showed that the complex conditions of the PCT initiated a controversial mechanism, leading to delayed degradation kinetics of the epoxy resin.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2021)
Article
Materials Science, Multidisciplinary
Anawati Anawati, Efrina Hidayati, Hasna Labibah
Summary: The study proposes a combination of short processing time and high current density to enhance the current efficiency of the plasma electrolytic oxidation (PEO) process. The resulting magnesium phosphate coatings demonstrated significantly improved hardness and corrosion resistance. The PEO process efficiency was relatively high, with the highest efficiency achieved at 800 A.m(-2).
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Sihang You, Yuanding Huang, Hajo Dieringa, Emad Maawad, Weimin Gan, Yaping Zhang, Karl Ulrich Kainer, Regine Willumeit-Roemer, Norbert Hort
Summary: The addition of rare earth element Y can effectively improve the creep properties of magnesium alloys, enhancing both ambient strength and high temperature strength. Y additions exhibit a linear relationship with the yield strength of Mg-Y alloys at room temperature, but reduce the yield strength at high temperatures. These alloys also demonstrate high thermal stability above 200 degrees C. The creep resistance of magnesium is largely improved with small amounts of Y, but further increasing Y content weakens its contribution to creep resistance.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Physical
Maria del Rosario Silva Campos, Carsten Blawert, Nico Scharnagl, Michael Stoermer, Mikhail L. Zheludkevich
Summary: In this study, a screening of Al-X alloys was conducted to find environmentally friendly alternatives to replace Cd for corrosion protection of steel. Promising Al-based sacrificial alloys were identified and suitable heat treatments were implemented to improve their corrosion properties. Extensive evaluation in NaCl solution identified the most promising alloys for efficient cathodic protection of steel, avoiding Al passivation.
Article
Metallurgy & Metallurgical Engineering
Tatsiana Shulha, M. Serdechnova, M. H. Iuzviuk, I. A. Zobkalo, P. Karlova, N. Scharnagl, D. C. F. Wieland, S. Lamaka, A. A. Yaremchenko, C. Blawert, M. L. Zheludkevich
Summary: This study reports the possibility of directly synthesizing layered double hydroxide (LDH) on AZ91 surface in the presence of chelating agent DTPA. The obtained LDH was characterized using experimental and computational methods, and a comparison of three possible LDHs was performed. The results confirmed the growth of mixed LDH-OH/CO3 on the surface in the presence of DTPA pentasodium salt.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Polymer Science
Rubiane Marta Mayer Ferreira, Alan Ambrosi, Thiago Ferreira da Conceicao
Summary: In this article, we investigated the post-polymerization modification of a polyetherimide via Friedel-Crafts acylation to synthesize derivatives with different side groups and degrees of acylation. The results showed that increasing the degree of acylation and the size of the acyl group led to a decrease in the glass transition temperature, while the thermal stability remained unaffected. The water contact angle of the derivative membranes increased with higher degrees of acylation. Gas permeability tests demonstrated that the permeability to N-2 and CO2 increased as the degree of acylation increased, indicating the potential of post-polymerization Friedel-Crafts acylation in obtaining efficient gas separation membranes.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Chemical
Zhenzhen Zhang, Md. Mushfequr Rahman, Barbara Bajer, Nico Scharnagl, Volker Abetz
Summary: In this study, a series of porous membranes with different effective pore sizes were successfully prepared using a membrane post-modification technique. The excellent separation performance was demonstrated by separating organic molecules of 1-2 nm in size.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Yaping Zhang, Yuanding Huang, Xiang Chen, Berengere Luthringer-Feyerabend, Ju Xue, Daniela Zander, Regine Willumeit-Roemer, Karl Ulrich Kainer, Norbert Hort
Summary: This study investigates the biodegradation properties of pure magnesium with different iron contents and surprisingly finds that the iron impurity does not have a negative effect on the degradation of pure magnesium, even when the iron content exceeds the previous tolerance limit. Detailed microstructural analyses reveal that the severe local micro-galvanic corrosion caused by the iron impurity promotes the formation of a compact calcium-rich corrosion product layer, protecting the adjacent magnesium matrix from further corrosion.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Jiangfeng Song, Hua Zhao, Jinge Liao, Bin Jiang, Ang Zhang, Yuanding Huang, Karl Ulrich Kainer, Norbert Hort, Fusheng Pan
Summary: This study investigated the hot tearing mechanism of Mg-1Al, Mg-0.9Y, Mg-2Gd, Mg-1.5Zn, and Mg-0.5Ca binary alloys by conducting hot tearing tests and utilizing 3D X-ray tomography technology. The results revealed the susceptibility of these alloys to hot tearing and the factors contributing to it, such as temperature range and residual liquid fraction. The discussion also considered factors like fluidity, thermal expansion coefficient, and mechanical property to provide a comprehensive understanding of the hot tearing mechanism.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Sergey Perevoznikov, Ludmila Tsybulskaya, Vladislav Shendyukov, Nico Scharnagl
Summary: A new method of preparing light absorbing coatings based on electrodeposited nickel-phosphorus coatings has been proposed. By modifying the electrolyte, an ultrablack surface with a low reflectance coefficient can be achieved. The chemical composition and formation mechanism of both surfaces have been studied. It has been found that etching in nitric acid leads to oxidation and the formation of a needle-like microstructure. The light absorbance ability of the coatings is caused by the distribution of fine nickel-phosphorus particles in a dielectric matrix and the specific microstructure of their surfaces.
SURFACES AND INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Yiyi Lu, Yuanding Huang, Julia Bode, Carla Vogt, Regine Willumeit-Romer, Karl Ulrich Kainer, Norbert Hort
Summary: The influences of Gd additions and T4 treatment on the mechanical properties and corrosion of Mg-Gd alloys were investigated. Gd solid solution and intermetallic particles were found to improve the hardness and strength of the alloy, while increasing Gd additions led to higher corrosion rates. T4 heat treatment effectively reduced degradation rates and susceptibility to pitting. Mg-2Gd alloy showed a favorable combination of mechanical properties and low homogeneous degradation rate, making it a potential candidate for implants.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Applied
Carlos Henrique Michelin Beraldo, Almir Spinelli, Nico Scharnagl, Thiago Ferreira da Conceicao
Summary: This study investigated environmentally friendly coatings of chitosan-derivatives with natural aldehydes for corrosion protection of magnesium AZ31 alloy. The derivatives were characterized using FTIR and UV-Vis, and the coated samples were analyzed using SEM, potentiodynamic polarization and EIS. The results showed that increased modification degree led to decreased corrosion current density and swelling degree, while impedance modulus increased. The relationship between |Z| and swelling with modification degree was proposed for the first time.
CARBOHYDRATE POLYMERS
(2022)
Article
Crystallography
Maria Nienaber, Gerrit Kurz, Dietmar Letzig, Karl Ulrich Kainer, Jan Bohlen
Summary: The application of magnesium flat products is affected by the limited formability at room temperature and the anisotropy of the mechanical properties, which is mainly caused by the underlying hexagonal crystal structure of magnesium and the development of strong crystallographic textures during massive forming processes. This study focuses on the influence of the manufacturing process on the microstructure and texture evolution of flat products made of conventional magnesium alloy AZ31, and discusses the effects on mechanical properties and formability.
Article
Nanoscience & Nanotechnology
Zhihao Chen, Xianliang Li, Bin Gong, Nico Scharnagl, Mikhail L. Zheludkevich, Hanjie Ying, Wenzhong Yang
Summary: We have fabricated double stimuli-responsive PPy nanocapsules and incorporated them into a corrosion-resistant epoxy coating for protecting Fe-based metal substrates. The nanocapsules respond to pH and redox stimuli, controlling the release of corrosion inhibitors and inhibiting corrosion reactions.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Biophysics
Nils Burmeister, Christel Vollstedt, Cathrin Kroeger, Timo Friedrich, Nico Scharnagl, Marcus Rohnke, Eilika Zorn, Sebastian G. Wicha, Wolfgang R. Streit, Wolfgang Maison
Summary: Zwitterionic polymer brushes were successfully grafted from bulk polyethylene via air plasma activation and radical polymerization. The resulting layers showed a low contact angle and a high density of solvent accessible zwitterions. Antifouling properties were confirmed through bacterial adhesion tests and seawater tests.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2023)
Article
Chemistry, Applied
Flavio de Sousa Santos, Almir Spinelli, Nico Scharnagl, Thiago Ferreira da Conceicao
Summary: This study investigated the properties of pectin coatings crosslinked with Ba2+ or Ca2+ ions on AZ31 magnesium alloy, and found that the coatings crosslinked with Ba2+ exhibited better swelling resistance and corrosion protection. These results indicate that pectin is a suitable polymer for preparing efficient, sustainable, and biodegradable coatings for magnesium alloys.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Materials Science, Multidisciplinary
Zhichao Shang, Xiaoping Cai, Farshid Pahlevani, Yan Zheng, Akbar Hojjati-Najafabadi, Xinran Gao, Baojing Zhang, Peizhong Feng
Summary: High porosity Co-Al-Fe intermetallics with 3D-microstructures were successfully synthesized in one step via a thermal explosion reaction. The link between pore structure and permeability was investigated using 3D-XRM technology. The corrosion resistance of the samples with different Fe contents was studied at 900 degrees C under an oxygen/sulphur atmosphere for up to 120 h. The results showed that the samples maintained stable pore structure and intact internal matrices, attributed to the formation of a thin protective layer on the surface. In addition, inward diffusion of S resulted in the formation of FeS nodules.
Article
Materials Science, Multidisciplinary
Lian Ma, Hain Yang, Daquan Zhang, Wei Wu
Summary: In this study, an environmentally friendly volatile corrosion inhibitor, lysine salts (LA), was prepared between graphene oxide (GO) layers using an in situ intercalation technique. The corrosion inhibition effect of LA was evaluated, and it was found that LA-GO2 achieved a 99.3% corrosion inhibition efficiency after composition optimization. The inhibition of the electrochemical anodic process on the surface of mild steel was the main reason for the high corrosion inhibition efficiency of LA-GO2. The properties of the surface film on the corroded steel were also characterized in detail to understand the corrosion inhibition mechanism of LA-GO2.
Article
Materials Science, Multidisciplinary
Running Wang, Jiaping Zhang, Bing Liu, Jie Fei, Qiangang Fu
Summary: By introducing a tailored SiC-C interphase, the carbon fiber can be effectively protected, improving the mechanical and ablation properties of leading edge shaped C/C-ZrC-SiC composites.
Article
Materials Science, Multidisciplinary
Zihua Wang, Chijia Wang, Ruitao Wang, Jiapeng Deng, Kun Zhang, Yanji Zhu, Huaiyuan Wang
Summary: A robust anti-corrosive coating has been developed using functional fly ash, which demonstrates excellent corrosion resistance and improved mechanical properties. The coating achieves these enhancements through molecular cross-linking design and surface augmentation techniques, resulting in a significantly improved impedance modulus compared to pure polyurea coatings.
Article
Materials Science, Multidisciplinary
Haofei Sun, Meifeng Li, Hao Zhang, Jing Liu
Summary: The oxidation behavior of FeCrNi medium entropy alloy was investigated through experimental observations and density functional theory (DFT) calculations. The study found that at 900 degrees C, the alloy forms a desirable and continuous oxide layer, while at 1000 degrees C, the oxide layer becomes discontinuous with penetration of oxide. These observations highlight the significant role of phase structure in promoting the formation of protective oxide scales and influencing oxidation resistance.
Article
Materials Science, Multidisciplinary
Yang Li, Ke Ma, Jingjun Xu, Jingjing Li, Yueming Li, Yi Zhang, Jun Zuo, Meishuan Li
Summary: Cr2AlC diffusion barrier effectively blocks the diffusion of Ti, enhancing the stability and spalling resistance of the Al2O3 scales between NiCrAlY coating and TiAl alloy.
Article
Materials Science, Multidisciplinary
Weiyi Wang, Qinglin Pan, Xiangdong Wang, Bing Liu
Summary: By adding Ce, Sc, Y and Zr elements to Al-Mg-Si alloy, the microstructure of the alloy can be regulated, and the corrosion and heat resistance of the materials can be improved.
Article
Materials Science, Multidisciplinary
Andrea Cristoforetti, Javier Izquierdo, Ricardo M. Souto, Flavio Deflorian, Michele Fedel, Stefano Rossi
Summary: This study presents a new approach to studying the mechanism of filiform corrosion in organic coated steel using the scanning vibrating electrode technique (SVET) and micropotentiometry (potentiometric SECM). The electrochemical activity under the coating was evaluated by mapping the ionic current densities coming from artificial defects made in specific locations of the filament. Antimony tips were also used to investigate the pH changes associated with different corrosion reactions at the metal-paint interface. Local pH levels along the filament in the anodic and cathodic regions were determined.
Article
Materials Science, Multidisciplinary
Yang Gao, Dayun Sun, Zhu Liu, Shuo Cong, Rui Tang, Yanping Huang, Lefu Zhang, Xianglong Guo
Summary: The corrosion characteristics of a novel alumina-forming austenitic steel in high-pressure high-temperature water environment were studied. The addition of aluminum has a negative effect on the continuity of the alumina scale.
Article
Materials Science, Multidisciplinary
Negin Madelat, Benny Wouters, Peter Visser, Zahra Jiryaeisharahi, Kristof Marcoen, Shoshan T. Abrahami, Annick Hubin, Herman Terryn, Tom Hauffman
Summary: This work explores the correlation between electrolyte transport properties and the variation of pigment volume concentration (PVC) in organic coatings. An odd random phase electrochemical impedance spectroscopy (ORP-EIS) approach is used to analyze the diffusion of ions independent from water uptake. The results show that a higher PVC leads to a more homogeneous coating structure, resulting in faster diffusion of ions and enhanced water uptake.
Article
Materials Science, Multidisciplinary
Eloa Lopes Maia, Serguei Gavrilov, Valentyn Tsisar, Kitty Baert, Iris De Graeve
Summary: The effect of pre-oxidation in air at 300-500°C on the initiation and development of liquid metal corrosion attack on 316L austenitic steel in static lead-bismuth eutectic (LBE) has been investigated. It was found that pre-formed oxide films can protect the surface against dissolution, while high temperature pre-oxidation leads to localized corrosion.
Article
Materials Science, Multidisciplinary
Baozhuang Sun, Qiuyu Wang, Yue Pan, Zhiyong Liu, Cuiwei Du, Xiaogang Li
Summary: In this study, a non-steady electrochemical model was established to investigate stress corrosion cracking (SCC). The model was verified using 304 SS with various microstructures, confirming its effectiveness in assessing SCC susceptibility.
Article
Materials Science, Multidisciplinary
Xingyu Xiao, Xinhua Liu, Zhilei Wang, Xuexu Xu, Mingying Chen, Jianxin Xie
Summary: The corrosion behavior and mechanisms of Cu-10Ni-X (Al, Fe, Mn, Cr, Sn, Ti, Zn) alloys in a 3.5% NaCl solution were systematically investigated. Both computational and experimental results revealed that except Ti, other elements could enhance the corrosion resistance of Cu2O passivation film.
Article
Materials Science, Multidisciplinary
Gen Zhang, Yan-Ping Huang, E. Jiang, Wei -Wei Liu, Hong Yang, Jing Xiong, Yong-Fu Zhao
Summary: The addition of aluminum has a significant influence on the intermetallic compounds in AFA alloys, particularly increasing the content of B2-NiAl phase. In the SCO2 environment, the oxide scales formed on AFA alloys with aluminum were thinner than on ASS without aluminum, and the structure of the oxide scales changed to a double-layer structure.
Article
Materials Science, Multidisciplinary
Yuxuan He, Guozheng Xiao, Chao Wang, Xuefeng Lu, Liuyuan Li, Shiying Liu, Yusheng Wu, Zhanjie Wang
Summary: The relationship between configurational entropy and lattice distortion in novel rare earth monosilicates was investigated, and the effect of configurational entropy on their properties was studied. The results showed that lattice distortion increased with the increase of configurational entropy, but a highly symmetrical crystal structure was formed when the configurational entropy was large enough, inhibiting the lattice distortion.
