Article
Materials Science, Multidisciplinary
Daniel Dickes, Beyza Oeztuerk, Felix Baier, Pascal Berger, Easo P. George, Rainer Voelkl, Mathias C. Galetz, Uwe Glatzel
Summary: We investigated the oxidation process of TiZrNbHfTa high entropy alloy as a surface hardening method at temperatures between 550 degrees C and 650 degrees C. Coarse-grained specimens exhibited catastrophic oxidation, while ultrafine-grained, cold-rolled specimens showed continuous mass gain and the formation of a vitreous oxide layer. Selective internal oxidation of hafnium and zirconium occurred upon oxygen inward diffusion, leading to an increase in oxygen concentration and hardness at the surface.
Article
Materials Science, Multidisciplinary
Jingjie Dai, Caixia Sun, Amin Wang, Hongxia Zhang, Shouying Li, Hailong Zhang
Summary: This study investigated the high-temperature oxidation and hot corrosion behaviors of a Ti2AlNb alloy at 923 K and 1023 K. The alloy showed good resistance to oxidation and hot corrosion at 923 K over 1000 h, but was not resistant at 1023 K. Additionally, the intensity of hot corrosion increased with a higher content of NaCl in the mixed salt medium.
Article
Materials Science, Multidisciplinary
Fangqiang Ning, Jibo Tan, Ziyu Zhang, Xinqiang Wu, Xiang Wang, En-Hou Han, Wei Ke
Summary: The study explores the crevice corrosion behavior of Alloy 690 in high-temperature chloride solution with different concentrations of thiosulfate and dissolved oxygen. Thiosulfate inhibits corrosion by consuming oxygen in aerated solution and promotes pitting corrosion by incorporating into oxide films in deaerated solution, influencing their composition and thickness. The mechanisms of thiosulfate and dissolved oxygen on crevice corrosion in high-temperature chloride solution are discussed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Fangqiang Ning, Jibo Tan, Ziyu Zhang, Xiang Wang, Xinqiang Wu, En-Hou Han, Wei Ke
Summary: The crevice corrosion behavior of Alloy 690 in high-temperature aerated chloride solution was investigated, and the resulting oxide films were analyzed. The study found that the composition of the oxide films differed between inside and outside the crevice, and the decrease in pH value and migration of chloride ions were identified as key factors in crevice corrosion.
Article
Materials Science, Multidisciplinary
Gokul Obulan Subramanian, Chaewon Kim, Woong Heo, Changheui Jang
Summary: The corrosion behavior of a high titanium heat resistant alloy in high temperature steam was evaluated, showing the formation of different oxide layers on the austenite matrix. Pre-oxidation treatment was found to improve corrosion protection in steam environment.
Article
Materials Science, Multidisciplinary
Ouyang Di, Zheng-jie Chen, Hai-bin Yu, K. C. Chan, Lin Liu
Summary: The oxidation behavior of Ti38V15Nb23Hf24 refractory high-entropy alloy in air was studied. Two types of oxidation behavior were observed. Below 1000?, a dense composite oxide scale formed on the surface, while above 1000?, internal oxidation occurred in the alloy matrix.
Article
Materials Science, Multidisciplinary
Kaiyang Li, Yimin Zeng, Jing-Li Luo
Summary: The study found that adding 100 ppm H2O significantly increased oxidation reactions in supercritical CO2, while the presence of O2 led to the opposite tendency. Alloy 740 showed better resistance to carburization and exhibited good corrosion resistance in the supercritical CO2 environment when compared to SS310.
Article
Materials Science, Multidisciplinary
Hengji He, Maolin Lai, Chunhai Liu, Guoqiang Zeng, Linxin He, Wei Zhang, Jun Yi, Sujuan Liu, Jianping Long
Summary: The AlCrNbTiZr high-entropy alloy (HEA) coatings were prepared on Zr-4 substrate using magnetron sputtering at different deposition temperatures. The influence of deposition temperature on the microstructure, mechanical properties, surface wettability, high temperature corrosion, and oxidation resistance of the coatings was systematically investigated. The results showed that the thickness of the coatings initially decreased and then increased with increasing deposition temperature. All the deposited coatings exhibited amorphous structures with BCC nanocrystalline domains, and the coating surfaces were hydrophobic. The room temperature (RT) deposited coatings exhibited high hardness (25.41GPa), good adhesion (50N), and corrosion resistance compared to coatings deposited at other temperatures. The RT deposited coating maintained its ability to protect the Zr-4 substrate after 1200 degrees C steam oxidation for 30 minutes. The corresponding steam oxidation mechanism was also discussed in detail.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiayu Xie, Shihao Zhang, Jiuyang Dong, Shengkai Wang, Hui Wang, Wenjun Kuang
Summary: This study investigates the initiation behavior of stress corrosion cracking (SCC) of FeCrAl alloy in high temperature hydrogenated water through constant extension rate tensile (CERT) test. Compared to 304 stainless steel (SS), FeCrAl alloy shows greater resistance to SCC initiation, which is attributed to its different oxidation behavior.
Article
Materials Science, Multidisciplinary
Lingyun Bai, Wenyi Peng, Dandan Men, Jun Zhu, Xuecheng Wu, Xiongtao Shi, Junhuan Xiang, Xiaohua Deng, Yuqing Wang, Zuxiang Sun, Siqi Yu, Xiang Wei
Summary: The study compared the performance of 904L alloy, AlFeNiMoNb alloy, and 904L:AlFeNiMoNb high-entropy alloy under high-temperature chloride corrosion conditions. The results showed that 904L:AlFeNiMoNb high-entropy alloy exhibited significantly higher resistance to high temperature chloride corrosion at both 700 degrees C and 800 degrees C compared to 904L and AlFeNiMoNb alloys.
FRONTIERS IN MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yusheng Zhang, Bin Wu, Hongliang Ming, Yifeng Li, Zhiming Zhang, Jianqiu Wang, En-Hou Han
Summary: The friction-induced microstructural evolution of Alloy 690TT tubes submerged in a high temperature pressurized water was investigated. Two typical local regions characterized by significantly different worn morphologies were studied in detail, revealing the influence of stress field and material couple on the wear patterns. Thin third-body layer and thick Fe-rich layer were observed, and their oxidation behavior was analyzed. The tribologically transformed structure was found to be formed by the mechanism of discontinuous dynamic recrystallization.
Article
Chemistry, Physical
P. Bhuyan, M. Paliwal, V. Subramanya Sarma, B. de Boer, R. Mitra, S. Mandal
Summary: In this systematic study on a Ni-based superalloy, it was found that the evolution of precipitates during aging significantly affects the high-temperature hot corrosion performance. The improved corrosion resistance was attributed to the rapid formation of oxide layer and the presence of undissolved carbides at grain boundaries, which hindered the inward transport of corrosive species.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Lingyun Bai, Wenyi Peng, Jun Zhu, Xuecheng Wu, Xiongtao Shi, Junhuai Xiang, Xiaohua Deng, Yuqing Wang, Zuxiang Sun, Siqi Yu
Summary: High temperature chloride corrosion tests were conducted to compare the performance of AlFe2.5NiMoNbCr high-entropy alloy, Inconel625, and AlFeNiMoNb plate. The results showed that the corrosion process of AlFe2.5NiMoNbCr high-entropy alloy formed a continuous Al2O3 layer, and the dendritic Al2O3 improved the adhesion of the corrosion layer through oxide pegging mechanism. Additionally, the observation of metal chloride oxides on the samples sealed at room temperature for several days complemented the understanding of high temperature chlorine corrosion. The Al2O3/Cr2O3 double-layer of AlFe2.5NiMoNbCr has better potential application value compared to the single Cr2O3 layer of Inconel625.
Article
Materials Science, Ceramics
Kedong Yu, Wei Zhao, Zhen Li, Ning Guo, Guangchun Xiao, Hui Zhang
Summary: In-situ TiC particles and Mo-enhanced AlCoCrFeNiMox(TiC)2-x high entropy alloy (HEA) coatings (x = 0, 0.5, 1, 1.5, and 2) were prepared via laser cladding. The effects of changes in x on the phase, microstructure, microhardness, high-temperature oxidation resistance and corrosion resistance of the HEA coatings were investigated. The results showed that the main phase of the coatings was the BCC phase; moreover, the Mo-rich area gradually increased and the size and morphology of the TiC particles underwent a series of changes with the increase in x. In addition, the sigma and NiCrCoMo phases appeared when x = 1.5 and 2, respectively. Mo promoted the formation of a protective oxide layer and improved the stability of the passivation film, whereas the second phase increased the defects of the coatings, which determined the difference in the high-temperature oxidation resistance and corrosion resistance of the coatings. With an increase in x, the high-temperature oxidation and corrosion resistances of the coatings first increased and then decreased. The coating exhibited the best high-temperature oxidation resistance and corrosion resistance when x = 1, and its high-temperature oxidation resistance and corrosion resistance were respectively 5-12 times and 15-83 times better than those of the other coatings.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Qianlin Wu, Yu Liu, Zhonghua Zhang, Yameng Qi, Chunxia Zhang, Haitian Zheng, Yang Xu
Summary: The study found that adding (Mo, Mo/Ni) to Fe-9Cr alloy can improve carbide precipitation, oxidation behavior, and high-temperature tensile properties.
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.