Article
Chemistry, Physical
Shuaikang Yang, Chen Wang, Fuzhen Li, Naihao Liu, Putong Shi, Baojin Wang, Ruixue Sun
Summary: Micro-arc oxidation (MAO) is an effective and environmentally friendly method for generating dense and homogeneous coatings with high corrosion resistance on magnesium alloys. However, the porous structure of MAO coatings can lead to reduced corrosion resistance due to the invasion of corrosive media. In this study, a novel one-step in situ growth of a pore-sealing coating on MAO-coated AZ31B alloy was achieved by hydrothermal treatment. The resulting coating effectively seals the micro-pores and micro-cracks of the MAO coating and exhibits improved corrosion resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Coatings & Films
Runjia Liu, Yan Liu, Qiwen Yong, Zhi-Hui Xie, Liang Wu, Chuan-Jian Zhong
Summary: The long-term corrosion resistance of conventional micro-arc oxidation (MAO) coatings on magnesium alloy is limited by the inherent micro-scale pores. Zeolitic imidazolate framework-8 (ZIF-8) and zinc gluconate (ZnG) loaded ZIF-8 (ZnG@ZIF-8) were synthesized and incorporated into the MAO coating to enhance the corrosion resistance. The (ZIF-8 + ZnG@ZIF-8)/MAO composite coating showed significant improvement in corrosion protection compared to the blank MAO coating.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Jiyuan Zhu, Haojie Jia, Kaijin Liao, Xianxuan Li
Summary: The study improved the corrosion resistance and friction resistance of magnesium alloy micro-arc oxidation coatings by sealing with hydrothermal treatment and heat treatment, enhancing their performance in 3.5 wt% NaCl aqueous solution. This method is of great significance for promoting the application of magnesium alloys in industrial production.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Biophysics
Chunlin Li, Xiaohong Yao, Ruiqiang Hang, Xiangyu Zhang
Summary: In this study, nanostructured OCP coatings with variable structures were successfully prepared on MAO coated Mg by chemical deposition in a solution containing trace PO43- ions. The morphology and thickness of OCP coating can be regulated by varying deposition time, with the thinnest coating showing the best cytocompatibility at 0.5 h and the thickest coating showing the best corrosion resistance and mineralization at 2 h. These results demonstrate the potential for tailored OCP coatings to meet different clinical requirements by adjusting deposition time.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Jing Wang, Zhongchao Wang, Jinhe Dou, Yongkang Li, Cheng Hu, Huijun Yu, Chuanzhong Chen
Summary: In this study, Mg-2Zn-Mn alloy was surface modified using micro-arc oxidation (MAO) technique. The influence of potassium fluotitanate (K2TiF6) concentration in silicate basic electrolyte on the corrosion resistance and degradation of MAO coatings was investigated. It was found that TiF62- has a thickening effect on the coatings, and adding 0.25 and 0.50 g/L K2TiF6 results in better corrosion resistance. TiF62- concentration also affects the coating quality through the generation of F-. Anatase TiO2 formed by ionization of TiF62- plays a role in sealing the micro-pores of the MAO coating. The surface-modified Mg alloy exhibits improved hydrophilicity, reduced weight loss rate and pH value after immersion, and improved biocompatibility.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yuxiang Liu, Shu Wen, Guang Liang, Gen Tian
Summary: The research demonstrates that sealing treatment using a new organic-inorganic sealant effectively closes the pores of the MAO coating, providing a hydrophobic surface and significantly delaying the initiation of pitting corrosion, thus enhancing the corrosion resistance of magnesium alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Xinxin Jin, Di Mei, Dongfang Chen, Yaqian Li, Liguo Wang, Shijie Zhu, Shaokang Guan
Summary: Incorporating degradable calcium phosphate beta-TCP in the MAO coating enhances the corrosion resistance and biocompatibility, providing a strategy to improve the properties of magnesium alloy for orthopedic applications.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Xue Zhang, Shao-Dong Cui, Lin Zhou, Jing-Bao Lian, Jiao He, Xiao-Wu Li
Summary: The study focused on the performance of Ca-P coatings prepared in solutions with different pH values on pure magnesium substrate, showing that the 5.7Ca-P coating has excellent corrosion resistance and biocompatibility, providing stable protection in the initial degradation stage.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Applied
Ruozheng Wang, Chen Zhao, Zhenjun Peng, Xiaoyan Yan, Yuchen Sun, Qiangliang Yu, Bo Yu, Meirong Cai, Feng Zhou
Summary: A multifunctional organic/inorganic hybrid coating was prepared on AZ31 magnesium alloy by microarc oxidation and vapor deposition of Polyp-xylene. The coating exhibited excellent corrosion resistance and lubricating properties, offering promising application prospects for surface protection of magnesium alloys.
PROGRESS IN ORGANIC COATINGS
(2024)
Article
Chemistry, Physical
Jithu Jayaraj, A. Srinivasan, C. Arunchandran, V. Rajinikanth
Summary: This study proposes a two-stage chemical conversion coating process for magnesium alloys. The results show that the water-based coating has self-healing characteristics, while the ethanol-based coating has better corrosion resistance. Both coatings exhibit acceptable cell viability under physiological conditions.
APPLIED SURFACE SCIENCE
(2024)
Article
Materials Science, Multidisciplinary
Xinran Yao, Yujie Yang, Minxing Zheng, Jinghong Wang, Changyang Liu, Jiapeng Sun, Guosong Wu
Summary: This study proposes a strategy to enhance the corrosion resistance of magnesium alloys by transforming corrosion products into protective coatings. By immersing a magnesium-neodymium alloy in potassium dihydrogen phosphate solution, a uniform MgHPO4·3H2O coating is formed, which significantly improves the corrosion resistance of the alloy.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yong Liu, Yinchuan Wang, Jialiang Lin, Meng Zhou, Fei Yu, Yongcan Huang, Bin Kang, Deli Wang, Tianbing Wang, Hui Zeng
Summary: The study found that brushite coated JDBM had the highest corrosion resistance, followed by uncoated JDBM, and then pure Mg. The main corrosion product of the Mg alloys in the cell culture medium was MgCO3 center dot 3H(2)O. The corrosion form of the JDBM alloys was uniform corrosion, while that of pure Mg was not uniform.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Metallurgy & Metallurgical Engineering
Mohan Sathyaraj, K. Ravichandran, Sankara Narayanan
Summary: This study aims to prevent excessive dissolution of magnesium by forming a fluoride conversion coating as a pre-treatment, followed by deposition of magnesium phosphate coating to develop a magnesium fluoride-magnesium phosphate duplex coating. The results of the study demonstrate that the magnesium fluoride-magnesium phosphate duplex coating can significantly improve corrosion resistance and enhance the bioactivity of magnesium.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Coatings & Films
Xue Zhang, Lin Zhou, Shao-Dong Cui, Jing-Bao Lian, Jiao He, Xiao-Wu Li
Summary: A Ca-P sealing coating was prepared on the surface of microarcoxidation coating (MAO)-coated Mg, which significantly improved the corrosion resistance and biodegradability of the coated magnesium. The Ca-P coating also facilitated the deposition of osteoconductive minerals.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Xue Zhang, Lin Zhou, Shao-Dong Cui, Jing-Bao Lian, Jiao He, Xiao-Wu Li
Summary: The liquid-phase deposition time affects the performance of Ca-P sealing coating, and can facilitate the deposition of osteoconductive minerals, improving the corrosion resistance and biodegradability of magnesium implants.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Environmental
Shuqi Wang, Yaming Wang, Huijuan Zhang, Yongchun Zou, Guoliang Chen, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: The study introduces a novel super-repellent dual-layer coating (SDC) fabricated using plasma-induced high temperature liquid-phase assisted oxidation and deposition technique. The coating achieves multiple heat dissipation and mechanochemical stability, exhibiting excellent superhydrophobicity, passive radiative heat dissipation, chemical stability, mechanical durability, and electrical insulation properties. This work not only provides a promising approach for more efficient thermal management but also opens up new possibilities for designing and fabricating multifunctional integrated electronic packaging materials.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Haipeng Zhang, Yaming Wang, Yanlin Hu, Wei Mao, Yongchun Zou, Guoliang Chen, Shuqi Wang, Dechang Jia, Yu Zhou
Summary: The Cr3+-modified alpha-cordierite ceramics were synthesized via the sol-gel process and their effects on microstructure and thermophysical properties were investigated. MASCr(0.2) ceramic exhibited the highest emissivity and lowest thermal conductivity, while MASCr(0.4) ceramic showed a higher coefficient of thermal expansion due to its multiphase structure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Applied
Yuhao Wang, Jiahu Ouyang, Tao Wei, Gui Cao, Zhanguo Liu, Zhaoying Ding, Yujin Wang, Yaming Wang
Summary: A density functional theory (DFT) study was conducted to investigate various properties of (Gd1-xSmx)2Zr2O7, including mechanical stability, thermal conductivity, Debye temperature, electronic structure, and defect chemistry. The compounds exhibited excellent structural and mechanical stability, with (Gd0.25Sm0.75)2Zr2O7 showing the lowest Young's modulus, highest Possion's ratio, lowest Debye temperature, and lowest thermal conductivity. The study also examined the formation energies of various defects and observed that Sm-doped Gd2Zr2O7, especially GdSmZr2O7, exhibited improved irradiation tolerance. Furthermore, after ion irradiation, the crystal structure of GdSmZr2O7 transformed from pyrochlore to a defect fluorite without amorphous phase.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Physical
Shuqi Wang, Lei Wen, Yaming Wang, Yulin Cheng, Yingliang Cheng, Yongchun Zou, Yixing Zhu, Guoliang Chen, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: A novel double-layer structural nanocomposite coating was prepared using the PEO-SDSN technique, which has better comprehensive performance and energy-saving characteristics. Moreover, this technique provides a new strategy for fabricating double-layer multifunctional coatings.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Haipeng Zhang, Chao Wang, Yaming Wang, Shuqi Wang, Yongchun Zou, Guoliang Chen, Chunming Deng, Dechang Jia, Yu Zhou
Summary: This study deposited a high infrared emissivity coating on a Ni-based alloy using the atmospheric plasma spraying technique. The coating was achieved using saucer-shaped porous feedstocks and exhibited a bimodal organization similar to nanostructured thermal barrier coatings. The coating showed higher porosity and surface roughness compared to conventional coatings, resulting in a higher emissivity value in the 1-14 μm waveband at room temperature. The emissivity remained above 0.77 even at a temperature of 1200 °C.
APPLIED SURFACE SCIENCE
(2023)
Review
Crystallography
Yuhao Wang, Chong Jing, Zhao-Ying Ding, Yun-Zhuo Zhang, Tao Wei, Jia-Hu Ouyang, Zhan-Guo Liu, Yu-Jin Wang, Ya-Ming Wang
Summary: Since the use of nuclear energy, the problem of radionuclide disposal has been a major concern. Currently, a large amount of waste is stored at reactor sites, causing high storage costs and urgent disposal issues. Pyrochlore ceramics, known for their excellent irradiation stability, have been extensively studied as potential hosts for radionuclide waste. This review focuses on the structure, composition, synthesis process, properties, and irradiation stability of pyrochlore ceramics, emphasizing the ion irradiation effect.
Article
Chemistry, Physical
Chunyan Jiang, Yaming Wang, Shuqi Wang, Yongchun Zou, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: The microstructure of PEO coating on SiCp/Al composites under the influence of negative pulse was studied. The results showed that the cross-sectional porosity was significantly reduced to 5.1%. The electrical insulation performance of the coatings improved initially and then declined as the negative voltage increased from 0 V to 120 V.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Shuqi Wang, Yaming Wang, Gui Cao, Cuoliang Chen, Yixing Zhu, Maria Serdechnova, Carsten Blawert, Mikhail L. Zheludkevich, Yongchun Zou, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: The high temperature oxidation and corrosion behaviors of a plasma electrolytic oxidation (PEO) coating and a PEO/polysilazane (PEO/PSZ) dual-layer coating are investigated. The PEO coating tends to generate porous and loose scales, causing cracking or even complete peeling off from the substrate after exposure in NaCl+Na2SO4 salt at 600 degrees C for 240 h. The PEO/PSZ coating exhibits a three-layer structure after exposure in the same salt at 600 degrees C for 480 h, which retards the continuous penetration of corrosive media and further diffusion of oxygen, resulting in a remarkable reduction of oxidation and corrosion rate.
Review
Chemistry, Physical
Zhi-Gang Wang, Yun-Zhuo Zhang, Jia-Hu Ouyang, Xi-Wen Song, Min Xie, Ya-Ming Wang, Yu-Jin Wang
Summary: This paper provides a comprehensive review on the basic principles, advanced solidification processes, microstructure, and mechanical properties of nanocrystalline alumina-zirconia-based eutectic ceramics. It discusses the coupling growth principle, solidification techniques, and control strategy of solidification behavior. The microstructural formation of nanoeutectic structure and the mechanical properties, such as hardness, flexural and tensile strength, fracture toughness, and wear resistance, are also emphasized. Nanocrystalline alumina-zirconia-based eutectic ceramics with unique microstructural and compositional characteristics have shown promising improvements in mechanical performance compared to conventional eutectic ceramics.
Review
Materials Science, Multidisciplinary
Jianzhuo Zhang, Weibing Dai, Xishu Wang, Yaming Wang, Haitao Yue, Qiang Li, Xinle Yang, Chenguang Guo, Changyou Li
Summary: Preparation of coatings with excellent properties is an effective way to address the poor wear and corrosion resistance of aluminum alloys. Micro-arc oxidation (MAO) coatings exhibit high hardness, good adhesion, and excellent corrosion and wear resistance. However, defects such as micropores, cracks, overgrowth regions, and residual stress in MAO coatings are unavoidable, making it more difficult to control the surface properties associated with corrosion resistance, wear resistance, adhesion, and fatigue performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Review
Engineering, Mechanical
Ali Elgazzar, Sheng-Jian Zhou, Jia-Hu Ouyang, Zhan-Guo Liu, Yu-Jin Wang, Ya-Ming Wang
Summary: This paper provides a comprehensive overview of recent advances in high-temperature tribology and cutting performance of cermet and ceramic tool materials. It focuses on microstructural properties, surface processing or modifications, and lubrication techniques to optimize their performance. The study aims to provide guidelines for the design of ceramics and cermets with reduced friction and wear and increased cutting performance.
Article
Chemistry, Multidisciplinary
Guoliang Chen, Haoyang Fu, Yongchun Zou, Shuqi Wang, Yongwang Gao, Tongtong Yue, Jianyun Cao, Yaming Wang, Jun Qiu, Junming Zhao, Jiahu Ouyang, Dechang Jia, Yong Shuai, Yu Zhou
Summary: In this study, a Ca-Cr co-doped Y3NbO7 coating with a lamellar porous structure was fabricated, which exhibits an ultra-low thermal conductivity (<0.7 W m(-1) K-1) and near-unity emissivity (>0.9) across a broad wavelength range of 1-24 μm. The coating shows a record high emissivity to thermal conductivity ratio (>1.3) due to diffusion-mediated thermal conduction feature combined with the lamellar porous structure. The coating also exhibits robust mechanical and thermal stability, with a high bonding strength (18.3 MPa) and comparable thermal expansion coefficient to YSZ.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Ceramics
Zhao Wang, Yaming Wang, Shuqi Wang, Yongchun Zou, Guoliang Chen, Lei Wen, Guangxi Zhang, Lina Zhao, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: A NbSi2/SiO2-Nb2O5/HfSi2-HfO2 multilayer ceramic coating with Hf-rich out layers was designed and prepared on a dense NbSi2 surface to enhance oxidation resistance. The coating showed a lower mass gain (40%) compared to the NbSi2 coating after 100 hours at 1200 degrees C. The presence of HfO2 and HfSiO4 phases anchored in the SiO2 scale improved the structural stability of the ceramic phase and blocked oxygen penetration, inhibiting Nb-oxide growth and crack initiation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Coatings & Films
Chunyan Jiang, Yaming Wang, Shuqi Wang, Yongchun Zou, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: This study investigated the characteristics of PEO processes on SiCp/Al composite in aluminate electrolyte under the influence of negative pulse, aiming to tailor the soft sparking discharge states, thus achieving the compact ceramic coating and providing a deep understanding of the mechanisms involved. The results showed that large negative voltage accelerates the transition from arc sparking discharge to soft sparking discharge, and when the PEO process completely enters the soft spark discharge state, the lowest electron density can also be kept at 1.06 x 10^22 m-3, reaching the local thermodynamic equilibrium condition. Additionally, the introduction of negative voltage effectively reduces the irregular convex structures and the macropores in the coating, due to inhibiting destructive high-intensity spark discharge by the soft sparking discharge.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Yongchun Zou, Shuqi Wang, Guoliang Chen, Yaming Wang, Kaiwei Zhang, Chaoren Zhang, Daqing Wei, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: A plasma electrolytic polishing (PEP) technique was used to obtain high-quality surfaces of a TC4 alloy with high reflectivity. An orthogonal experiment was conducted to investigate the factors influencing the surface quality, and it was found that temperature had the greatest effect on surface roughness. After PEP, the alloy's surface roughness and crest and trough area decreased significantly.
SURFACE & COATINGS TECHNOLOGY
(2023)
