Article
Electrochemistry
A. Ortiz-Ozuna, F. A. Godinez, J. Genesca, R. Montoya
Summary: To better understand the anodic polarization of Mg, a gel electrolyte doped with phenolphthalein was used to avoid convective effects and reveal alkaline zones. This article provides new insights on Mg dissolution when galvanically coupled to AA7075. It has shown that OH- ions generated during Mg dissolution are locally neutralized in the electrolyte and accurately identified the location of Mg(OH)2 compound formation during anodic dissolution.
ELECTROCHIMICA ACTA
(2023)
Article
Materials Science, Multidisciplinary
Bingqian Xu, Jiapeng Sun, Jing Han, Zhenquan Yang, Hao Zhou, Lirong Xiao, Songsong Xu, Ying Han, Aibin Ma, Guosong Wu
Summary: Hierarchical precipitates composed of various phases in a fine-grain magnesium-gadolinium-silver alloy obtained through ECAP and subsequent peak-aging process facilitate corrosion to some extent, but their spatial redistribution improves the material's corrosion resistance possibly due to the formation of a protective corrosion product film.
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
Yingrui Liu, Shuyu Li, Hao Li, Guanshui Ma, Lili Sun, Peng Guo, Peiling Ke, Kwang-Ryeol Lee, Aiying Wang
Summary: A cleaning intervention was introduced to control the growth defect of the coating, which effectively improved the corrosion resistance in the deep-sea environment.
Article
Materials Science, Multidisciplinary
Juan Qiu, Xiang Gao, Kanglu Feng, Houyi Ma
Summary: Films with micron thickness were prepared on copper through thiol-based click reaction without metal catalyst or light irradiation. The protection efficiencies of the epoxy silane and vinyl ester-silane participated click-assembly films were 99.6% and 99.4%, respectively. The film formation was driven by the strong interaction between thiol and copper, leading to the formation of new C-S bonds via thiol-ene or thiol-epoxy reaction. Molecular dynamics simulation provided theoretical support for the experimental conclusion by revealing the most stable adsorption configurations and adsorption energy of the building blocks on the copper substrate.
Article
Materials Science, Multidisciplinary
A. P. Babu, S. Choudhary, J. C. Griffith, A. Huang, N. Birbilis
Summary: The research examined an additively manufactured aluminium alloy with high solute content, Al-14Zn-3Mg, which showed lower corrosion rate compared to a conventional wrought alloy, AA7075-T6. This difference was attributed to the microstructure and solute content of Al-14Zn-3Mg, specifically the absence of coarse intermetallic particles. Various tests were conducted to analyze the corrosion behavior of this new alloy manufactured through LPBF.
Article
Materials Science, Multidisciplinary
Liangshuai Guo, Baoxing Yu, Peng Zhou, Tao Zhang, Fuhui Wang
Summary: The high galvanic corrosion susceptibility and expensive Pd-activation process are critical obstacles for the application of electroless nickel (EN) plating on Mg alloy. In this study, a plasma electrolytic oxidation (PEO) coating was post-treated with chemical conversion to obtain an intermediate layer with high electrical resistance, aiming to reduce galvanic corrosion susceptibility. A low-cost Ag-activation technique was proposed to catalyze the EN plating process, leading to significant improvement in corrosion resistance of the EN composite coating. Additionally, the composite coating demonstrated high adhesion, hardness, electrical conductivity, and low magnetism.
Article
Materials Science, Multidisciplinary
Xiedong Ren, Hu Wang, Qiang Wei, Yuan Lu, Bowen Xiao, Juan Xie
Summary: The study explores the scale formation behavior of N80 steel in CO2 environments at different temperatures and immersion times. It is found that temperature and immersion time significantly influence the electrochemical behavior, as a result of different scales formed on the steel surface. The presence of CaCO3 inhibits corrosion and the formation of FeCO3, with aragonite CaCO3 providing better protection due to its compact structure.
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
Vojtech Hybasek, Jiri Kubasek, Jaroslav Capek, Dino Alferi, Jan Pinc, Jitrenka Jiru, Jaroslav Fojt
Summary: This study compared the degradation reactions of Zn-0.8Mg-0.2Sr in different in vivo environmental models, showing that proteins formed a natural-like barrier in the minimal essential medium, blocking less noble sites. The initial response during exposure differs from longer-term data.
Article
Materials Science, Multidisciplinary
Xiaokang Yue, Ningsong Qu, Xin Ma, Hansong Li
Summary: The anodic electrochemical behaviors of titanium matrix composites in different electrolytes were investigated. The corrosion resistance is better in NaNO3 electrolyte due to the formation of a more stable passive film. The dissolved surface quality is better in NaCl electrolyte, but the current efficiency is lower.
Article
Materials Science, Multidisciplinary
Santosh Prasad Sah
Summary: The evolution of electrochemical impedance and corrosion products was studied on 310S stainless steel in a carbonate melt at 650 degrees C under flowing CO2-2%O2 gas for 600 hours. The corrosion process involved the formation and dissolution of oxides, exposing metallic fragments and resulting in a porous inner layer. Insufficient protection from the outer layer led to continued corrosion.
Article
Materials Science, Multidisciplinary
Xiaoshan Mo, Junyu Qian, Yingqi Chen, Wentai Zhang, Peng Xian, Shuai Tang, Chao Zhou, Nan Huang, Huanzhong Ji, En Luo, Haijun Zhang, Guojiang Wan
Summary: The AL-embedded ZnP coating on biodegradable Zn effectively controlled its corrosion, reduced Zn2+ release rate, and maintained a uniform long-term degradation behavior in PBS, while also retaining a balanced osteo-functionality. This performance can be attributed to the organic-inorganic components and high quality of the coating.
Article
Materials Science, Multidisciplinary
Younghwan Jeon, Jungho Hur, Gwan Yoon Jeong, Seungmin Ohk, Jaeyeong Park
Summary: The anodic dissolution behavior of Inconel 600 was studied to facilitate the design of an efficient decontamination process for nuclear steam generator tubes. The effects of NiCl2 and FeCl2 additives in LiCl-KCl eutectic salts on the microstructural changes in Inconel 600 during electrolytic decontamination were investigated. Through Ni reduction, a Cr-Fe depletion layer formed on Inconel 600 at the positions where alloying elements oxidized. In the presence of FeCl2, a cavity-cluster layer was selectively dissolved through the grain boundary and its shape could be altered using electrochemical methods.
Article
Materials Science, Multidisciplinary
Kuo-Min Hsu, Sz-Han Chen, Chao-Sung Lin
Summary: The effect of Mn on the passivation behavior of FeCrNiCoMn high entropy alloy was investigated through anodic polarization experiments, revealing that a decrease in Mn content can enhance the corrosion resistance of the alloy by increasing the Cr2O3 content in the passive film. However, the competitive oxidation of Mn with Cr can lead to a reduction in Cr2O3 content and deteriorate the corrosion resistance of the alloy.
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.