Article
Engineering, Chemical
Lukasz Florczak, Ginter Nawrat, Kazimierz Darowicki, Jacek Ryl, Jan Sieniawski, Malgorzata Wierzbinska, Krzysztof Raga, Andrzej Sobkowiak
Summary: Plasma electrolytic oxidation is an effective method for improving the wear and corrosion resistance of magnesium alloys. The addition of NaBF4 and NaF to the electrolyte enhances the corrosion resistance of the protective layer, with NaBF4 showing the best results.
Article
Materials Science, Coatings & Films
Xiaopeng Lu, Jirui Ma, Marta Mohedano, Borja Pillado, Raul Arrabal, Kun Qian, Yan Li, Tao Zhang, Fuhui Wang
Summary: The study showed that sealing plasma electrolytic oxidation (PEO) coatings on AZ91 Mg alloy in calcium nitrate solutions at different pH values can enhance the corrosion resistance of the coatings. Adding SDS facilitates the formation of precipitates, resulting in hydrophobic coatings with poorer paint adhesion but better corrosion resistance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Ting Wu, Carsten Blawert, Xiaopeng Lu, Maria Serdechnova, Mikhail L. Zheludkevich
Summary: The presence of Li and Li-rich phases were found to be crucial for the treatment result on MgLi alloy's coating growth, rather than the original lattice structure. The modified discharge behavior of MgLi alloy led to a different microstructure of the coating, making it more susceptible to dissolution.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Metallurgy & Metallurgical Engineering
Yan Li, Xiaopeng Lu, Maria Serdechnova, Carsten Blawert, Mikhail L. Zheludkevich, Kun Qian, Tao Zhang, Fuhui Wang
Summary: This study achieved in-situ incorporation of layered double hydroxides (LDH) nanocontainers into plasma electrolytic oxidation (PEO) coatings on AZ91 Mg alloy. Fumarate was selected as the Mg corrosion inhibitor for exchange and intercalation into the nanocontainers, which were then incorporated into the coating. It was found that the presence of LDH nanocontainers increased the thickness and compactness of the coatings. The corrosion resistance of the coatings was greatly enhanced and stabilized by the loaded inhibitor and nanocontainers through ion-exchange when corrosion occurred.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
XinYue Lan, Dan Xiong, Ping Wang, Ting Wu, YanFei Duan, Zhao Yang, Dong Xiang
Summary: The addition of SmCl3 to the electrolyte improves the corrosion performance of the AZ91D magnesium alloy plasma electrolytic oxidation (PEO) coating. SmCl3 refines discharge holes, improves coating formation efficiency, and enhances the coating's combination with the substrate. Corrosion characteristics of the PEO coating are greatly improved with the presence of optimum level of SmCl3 in solution (0.25 g L-1).
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Zhao Yang, Dan Xiong, Ping Wang, Lan Xinyue, Yanfei Duan, Dong Xiang
Summary: This study investigated the properties of PEO coatings prepared on AZ91D magnesium in silicate electrolytes containing SnSO4. The addition of SnSO4 improved the compactness of the coating and decreased the size and number of micro-pores and micro-cracks. The doping of SnO2 into the coating enhanced its corrosion resistance. The optimal concentration of SnSO4 was found to be 0.3 g/L.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Metallurgy & Metallurgical Engineering
Weiyi Zhang, Yunhui Du, Peng Zhang
Summary: In this study, an ordinal discharge (OD) mode of plasma electrolytic oxidation (PEO) coating was developed to weaken the eruption of breakdown melt and improve the performance of the coating. By adjusting the mass ratio and voltage, the inner dense layer of the coating was thickened while the outer loose layer was densified, leading to enhanced corrosion resistance and reduced wear rate.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Physical
Sivan Sela, Konstantin Borodianskiy
Summary: Zirconium alloys are bioinert materials widely used in biomedical applications, and increasing their bonding with human tissues is a major research focus. This study presents a promising approach of plasma electrolytic oxidation (PEO) surface treatment in molten salt. PEO creates a highly adhesive surface to the bioenvironment, and processing in molten salt electrolyte reduces impurities on the surface. The synthesized ZrO2 coatings showed improved biocompatibility, microhardness performance, and corrosion resistance.
SURFACES AND INTERFACES
(2023)
Article
Metallurgy & Metallurgical Engineering
Bing-jian Wei, Yu-lin Cheng, Yuan-yuan Liu, Zhun-da Zhu, Ying-liang Cheng
Summary: The wear and corrosion resistance of AZ31 magnesium alloy was significantly improved by applying a magnetron-sputtered Al layer and plasma electrolytic oxidation (PEO) treatment, forming a duplex layer (PEO/Al). The aluminate coating showed better long-term corrosion protection compared to the silicate coating, with corrosion current densities significantly lower than the un-coated alloy.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Coatings & Films
Jinhe Dou, Jing Wang, Huancai Li, Yupeng Lu, Huijun Yu, Chuanzhong Chen
Summary: Plasma electrolytic oxidation (PEO) is an effective surface treatment technique for enhancing the corrosion resistance of Mg alloy, but the micro-pores and micro-cracks of the PEO coating can limit its protection capability. In this study, a dense Ca3Al2(OH)(12) layer was fabricated on the PEO coating surface using hydrothermal treatment (HT) to create a PEO/HT composite coating, which showed improved bioactivity and corrosion resistance compared to PEO coating and Mg alloy. The growth process of the Ca3Al2(OH)(12) layer on the PEO coating surface was discussed.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Chen Ma, Dong Wang, Jinyu Liu, Ning Peng, Wei Shang, Yuqing Wen
Summary: Plasma electrochemical oxidation (PEO) is used to create ceramic coatings on magnesium alloys. This study introduces a new method for in-situ sealing of PEO coatings using four-layer voltage and sol addition. The characterization of the coatings showed decreased porosity and increased thickness, leading to improved corrosion resistance. The self-sealing behavior of PEO was also explained in this article.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Materials Science, Coatings & Films
Chao Yang, Hu Cai, Suihan Cui, Jian Huang, Jiayu Zhu, Zhongcan Wu, Zhengyong Ma, Ricky K. Y. Fu, Liyuan Sheng, Xiubo Tian, Paul K. Chu, Zhongzhen Wu
Summary: This study improves the corrosion resistance of AZ31B magnesium alloy by coating it with a plasma electrolytic oxidation (PEO) film and modifying it with insoluble zinc phosphate. The combination of PEO and zinc phosphate enhances the corrosion resistance and significantly increases the lifetime of the magnesium alloy.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jae-Yeon Kim, Ki-Tae Yoo, Jai-Won Byeon
Summary: In this study, the effects of discontinuous precipitate (DP) and continuous precipitate (CP) on the tensile elongation and fracture mechanism of aging-treated AZ91D Mg alloy were investigated. The increase in area fraction of DPs was found to cause a slight decrease in tensile elongation due to cracking along grain boundaries. Experimental results also showed that a large number of fine tension twins were produced within a few percent of tensile elongation for specimens with high CP/alpha-Mg interfaces per unit volume, leading to premature fracture.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Applied
Tianlu Li, Fengdong Sun, Yun Zhao, Minfang Chen
Summary: In this study, a two-step treatment involving SiO2 gel and hexadecyltrimethoxysilane was used to modify PEO coatings on AZ91 alloy. The treatment effectively sealed the microholes in the PEO coating, resulting in a dense coating with improved hydrophobicity. The corrosion resistance of the substrate alloy was significantly enhanced, making it a promising approach for post-treatment of PEO coatings.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Materials Science, Coatings & Films
Luyao Xu, Dejian Zhang, Huijuan Su, Peng Yu, Yong Wan, Huilai Sun
Summary: This study investigated the effects of pullulan concentration in electrolyte solutions on the corrosion and tribocorrosion performance of AZ31B magnesium alloys after plasma electrolytic oxidization (PEO) treatment. The results showed that the addition of pullulan enhanced the compactness of the PEO coating, resulting in improved corrosion resistance and anti-tribocorrosion performance. The PEO coating produced in electrolyte solution containing 1.0 g/L pullulan exhibited the best overall performance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Honggyun Kim, Jamal Aziz, Vijay D. Chavan, Deok-kee Kim
Summary: Silicon nitride films were prepared using plasma enhanced chemical vapor deposition with different trap densities induced by adjusting the RF power ratio. It was found that the film's trap density was lowest under compressive stress and increased under tensile stress. This study has significant implications for the formation of durable nitride films in various electronic and optoelectronic applications.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Qiang Yu, Huwei Zhao, Yue Zhao
Summary: Zinc oxide thin films and Al-doped zinc oxide films were prepared and characterized in this study. The addition of Al ions was found to change the growth orientation, increase the grain size, and enhance the absorption intensity in the visible light region. Furthermore, the addition of Al ions also increased the forward current in the heterojunction.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Sang Woo Lee, Min Sun Park, Sangwon Wi, So Yeon Lim, Yeseul Lee, Jin-Seok Chung, Sang Mo Yang
Summary: In this study, we investigated the dynamics of domain switching in pristine and fatigued BiFeO3 capacitors through experimental observations and measurements. The results showed that the switching in the pristine capacitors was dominantly driven by domain growth, while the fatigued capacitors exhibited two different switching dynamics, in which nucleation played a critical role.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Boshi Wang, Tianyi Wang, Yufang Liu, Kun Yu
Summary: In this paper, a tunable and anisotropic perfect absorber composed of anisotropic black phosphorus (BP) and isotropic graphene is proposed. The structure exhibits high absorption and strong anisotropic plasma response. The resonance characteristics can be effectively controlled by adjusting geometric parameters and doping levels, offering potential applications.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Xiaolan Liu, Chunyang Li, Tonghui Yang, Naiqiang Yin, Gangling Zhao
Summary: Water drop triboelectric nanogenerators (WD-TENGs) can harvest energy from raindrops and improve the output performance of TENGs.
CURRENT APPLIED PHYSICS
(2024)
