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
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
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
Chemistry, Multidisciplinary
Chun-Wei Chen, Salim Levent Aktug, Chin-Jou Chang, Yueh-Lien Lee, Ming-Der Ger, Shun-Yi Jian
Summary: This study characterizes and determines the corrosion resistance of Mn-Ce conversion coated LZ91 magnesium alloy. It is found that using acid pickling as a pretreatment and applying a conversion coating can effectively improve the corrosion resistance of the magnesium alloy.
Article
Materials Science, Multidisciplinary
Yu-Jui Lin, Chao-Sung Lin
Summary: The corrosion behavior and corrosion rate of friction stir welded AZ31B magnesium alloy and 6N01 aluminum alloy dissimilar joints were studied using real-time imaging, potentiodynamic polarization, EIS, and hydrogen evolution tests. The corrosion rate was found to increase in the order of Al base metal < Mg base metal < stirred zone. The galvanic coupling of the Mg phase to other phases enhanced the corrosion of both base metals, and intense corrosion at BM-AZ31B elevated the interfacial pH due to water reduction on the cathodic particles of BM-6N01.
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
Electrochemistry
Peng Zhou, Hao Guo, Mingming Li, Chunyan Zhang, Baoxing Yu, Yunfei Zhai, Yan Chen, Jingli Sun, Yong Yuan, Tao Zhang, Fuhui Wang
Summary: Temperature is a critical parameter that affects the electrochemical reactivity and crystal nucleation/growth in the conversion treatment of Mg alloys. Increasing the operating temperature, however, reduces the reactivity of the bath and compromises the protective coating. Preheating the Mg substrate, on the other hand, does not change the chemistry of the bath. This study shows that preheating the Mg substrate to a temperature higher than the bath can effectively improve the protective coating due to enhanced crystal precipitation kinetics at the reaction fronts.
ELECTROCHIMICA ACTA
(2022)
Article
Materials Science, Multidisciplinary
Jinxiao Yang, Xudong Wang, Yiren Cai, Xiuyu Yang
Summary: A V/Ce conversion coating was deposited on the surface of AZ31B magnesium alloy using a solution containing vanadate and cerium nitrate. The composition and morphology of the coating were examined, revealing a thin and cracked coating with scattered spherical particles. The corrosion behavior of the substrate and conversion coating was studied through potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Compared to the bare AZ31B, the corrosion current density of the conversion coating decreased significantly, and the total impedance of the coating increased. The conductivity of the coating was found to be dependent on the semiconductor properties of the phase compositions.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Materials Science, Coatings & Films
Long Xu, Chuanyu Cui, Qi Lu, Hao Yang, Wanyu Zhang
Summary: This study investigated the microstructure and corrosion behavior of cold-sprayed Zn11Al3Mg zinc alloy coating. The results showed that the coating had a finely structured ternary eutectic phase and exhibited enhanced corrosion resistance compared to cold sprayed Zn coating.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Gualter Silva Pereira, Oscar Mauricio Prada Ramirez, Pedro Renato Tavares Avila, Julian Arnaldo Avila, Haroldo Cavalcanti Pinto, Marcos Hideki Miyazaki, Hercilio Gomes de Melo, Waldek Wladimir Bose Filho
Summary: This work evaluates the electrochemical behavior and morphological characterization of a system consisting of a cerium conversion layer, a hybrid sol-gel coating, and the two coatings applied sequentially (duplex) for corrosion protection of WE43 Mg alloy. Different characterization techniques showed that the previous application of the conversion coating improved the surface coverage by the hybrid coating. Fitting impedance diagrams with electrical equivalent circuits allowed proposing a physical model for the coating, demonstrating its interaction with the porous Mg oxide/hydroxide layer. Self-healing properties of the duplex coating were also revealed.
Article
Materials Science, Multidisciplinary
Kirill A. Emelyanenko, Elizaveta V. Chulkova, Alexey M. Semiletov, Alexander G. Domantovsky, Valeria V. Palacheva, Alexandre M. Emelyanenko, Ludmila B. Boinovich
Summary: A technologically simple route for the fabrication of superhydrophobic coatings on wrought magnesium alloy MA8 has been described. The coatings show significantly lower corrosion current and better protective activity compared to polished samples after prolonged immersion in corrosive solutions. The protective mechanisms of the coatings were discussed.
Article
Chemistry, Physical
Zhiyuan Feng, Charles C. Xu, Dadi Zhang, Rudolph Buchheit
Summary: The study showed that the corrosion resistance of AZ31 Mg alloy was significantly improved after coating treatment with 5 mM or 10 mM sodium selenite, with the protection mechanism attributed to the transformation of selenite to insoluble selenium, the formation of insoluble MgSeO3 hydrate, and the polymerization of amorphous selenium.
Article
Materials Science, Multidisciplinary
Siyu Sun, Peng Zhou, Jintao Xiao, Jingli Sun, Xiaoxue Wang, Tao Zhang, Fuhui Wang
Summary: In this work, a new design of phosphate chemical conversion coating with low electrical contact resistance and high light absorption (C-E-PCC) on Mg-Gd-Y-Zr (Mg-RE) alloy was proposed. The conversion coating was stained with black dye aiming to blacken PCC, and post-treated with silane loaded nano-Ag wire, achieving low electrical contact resistance (ECR) due to the overlapping network of Ag wires on the surface of PCC. The experimental results indicated that the hydrogen evolution volume of C-E-PCC was 2.54 +/- 0.09 ml/cm(2) immersion 3.5 % wt NaCl for 120 h. The absorption in the visible light range of C-E-PCC was 30%. Moreover, the ECR of C-E-PCC was 11.00 +/- 0.47 omega. The aforementioned results implied that the PCC not only with high absorbance and low ECR but also with high corrosion protection.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Iryna Kozina, Halina Krawiec, Maria Starowicz, Magdalena Kawalec
Summary: Spin coating technique was used to deposit chitosan coatings on the surface of Mg20Zn magnesium alloy, resulting in increased corrosion resistance by forming CaSiO3 and Ca-3(PO4)(2) compounds on its surface. Corrosion rate was reduced from 3.2 mm/year to 1.2 mm/year for uncoated and coated substrates, respectively.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Engineering, Biomedical
Qiangsheng Dong, Xingxing Zhou, Yuanjia Feng, Kun Qian, Huan Liu, Mengmeng Lu, Chenglin Chu, Feng Xue, Jing Bai
Summary: The study found that the DCPD coating on biomedical Mg can efficiently seal artificial scratches with anti-corrosive products, acting as both a physical barrier and a self-healing agent without the need for extra corrosion inhibitors. Additionally, the presence of Hank's solution promotes self-healing behavior by providing film-forming ions. These findings may lead to new opportunities for developing efficient self-healing coatings on biodegradable Mg implants.
BIOACTIVE MATERIALS
(2021)
Article
Materials Science, Coatings & Films
Shun-Yi Jian, Jun-Kai Chang, Kung-Feng Lin, Ting-Yu Chen, Jui-Hung Yuan, Ming-Der Ger
SURFACE & COATINGS TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Meng-Jey Youh, Chun-Shuan Lin, Nen-Wen Pu, Yih-Ming Liu, Ru-Yi Youh, Hao-Qian Li, Pei-Yu Tang, Ming-Hsien Lin, Ming-Der Ger
Article
Materials Science, Composites
Cheng-Hung Shih, Chang-Pin Chang, Yih-Ming Liu, Yu-Liang Chen, Ming-Der Ger
Summary: In this study, shear thickening fluids (STFs) with different rheological properties were fabricated to investigate the influence of mixing process on resultant rheological behavior. The results showed that STFs with higher critical shear rate are optimal for ballistic impacts, and placing the STF structure at the rear position significantly increases impact resistance.
APPLIED COMPOSITE MATERIALS
(2021)
Article
Polymer Science
Chang-Pin Chang, Cheng-Hung Shih, Jhu-Lin You, Meng-Jey Youh, Yih-Ming Liu, Ming-Der Ger
Summary: The study found that polyurea/Kevlar fabric composites offer better impact resistance than conventional Kevlar fabrics, and a 2mm STF structure can replace approximately 10 layers of Kevlar in a ballistic resistant layer. The high-strength composite laminate using the best polyurea/Kevlar plates combined with the STF structure was more than 17% lighter and thinner than the conventional Kevlar laminate, indicating the superior performance of the protective materials developed in this study.
Article
Chemistry, Multidisciplinary
Meng-Jey Youh, Yu-Ren Huang, Cheng-Hsiung Peng, Ming-Hsien Lin, Ting-Yu Chen, Chun-Yu Chen, Yih-Ming Liu, Nen-Wen Pu, Bo-Yi Liu, Chen-Han Chou, Kai-Hsiang Hou, Ming-Der Ger
Summary: This study enhanced the corrosion resistance of composite epoxy coatings by incorporating graphene nanosheets (GN), while reducing their infrared stealth properties. Optimal corrosion resistance was achieved at very low filler concentration (0.05 wt.%).
Article
Materials Science, Multidisciplinary
Jhu-Lin You, Yi-Shin Chen, Chang-Pin Chang, Min-Zhe Wu, Ming-Der Ger
Summary: In this study, a simple and efficient method to prepare a copper layer on nylon 6 fabrics using a pH-responsive styrene (St)-co-N, N-dimethyl-dimethylaminoethyl methacrylate (DMAEMA)/ Pd nanocomposite is described. This method effectively enhances adhesion between the copper layer and substrate, resulting in excellent copper deposition on the fabric. The characteristics of pH-responsive copolymers play a crucial role in the electroless copper plating process, making this method successful in metallizing nylon 6 fabric.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Multidisciplinary
Chun-Wei Chen, Salim Levent Aktug, Chin-Jou Chang, Yueh-Lien Lee, Ming-Der Ger, Shun-Yi Jian
Summary: This study characterizes and determines the corrosion resistance of Mn-Ce conversion coated LZ91 magnesium alloy. It is found that using acid pickling as a pretreatment and applying a conversion coating can effectively improve the corrosion resistance of the magnesium alloy.
Article
Materials Science, Multidisciplinary
Chia-Yu Lee, Jeou-Long Lee, Shun-Yi Jian, Chi-An Chen, Salim Levent Aktug, Ming-Der Ger
Summary: This study investigates the addition of fluoride to the electroless nickel-phosphorus plating solution to improve the corrosion resistance of MAO-coated AZ31B magnesium alloy. Fluoride reacts with Ni2+ ions and the MAO coating to form interphases, which enhance bonding and corrosion resistance. The presence of fluoride in the plating solution results in a more corrosion-resistant coating. The composition, structure, and morphology of the coatings are characterized using various analytical techniques, and their corrosion resistance is evaluated using different tests.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Polymer Science
Chun-Hao Chen, Chia-Yu Lee, Ming-Der Ger, Shun-Yi Jian, Jung-Chou Hung, Po-Jen Yang, Chun-Hsiang Kao, Yi-Cherng Ferng, Ying-Sun Huang, Kuo-Kuang Jen
Summary: This study investigates the effect of activation treatment prior to electropolishing on the surface of additive manufactured titanium-based materials. The results show that activation treatment with oxalic acid followed by electropolishing can significantly reduce the surface roughness and improve hardness and corrosion resistance.
Article
Materials Science, Multidisciplinary
An -Yu Cheng, Hung-Hua Sheu, Pao-Chang Huang, Yih-Ming Liu, Nen-Wen Pu, Ming-Der Ger
Summary: This study evaluated sodium citrate (SC) and sodium propionate (SP) as environmentally friendly alternatives to boric acid (BA) as a buffering agent in electrodeposition of high-strength Ni-B alloy. The Ni-B coating electrodeposited with SC exhibited the best corrosion resistance, mechanical properties, and high-temperature endurance. The results provide a greener method for preparing high-strength Ni-B coatings suitable for high-temperature applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Polymer Science
Cheng-Hung Shih, Jhu-Lin You, Yung-Lung Lee, An-Yu Cheng, Chang-Pin Chang, Yih-Ming Liu, Ming-Der Ger
Summary: Polyurea-treated aramid composite structures show the best impact resistance, while epoxy-treated structures are prone to stress concentration and reduced impact resistance. Impregnating aramid fabric with STF improves structural protection but also increases weight and reduces specific energy absorption per unit area.
Article
Engineering, Chemical
Chi-An Chen, Jeou-Long Lee, Shun-Yi Jian, Chia-Yu Lee, Ming-Der Ger
Summary: This study uses micro-arc oxidation (MAO) and electroless nickel-phosphorus (Ni-P) plated composite film to improve the corrosion resistance of LZ91 magnesium alloy. The results show that activation by a neutral catalyst (pH=7) maintains the original structure of the MAO coating and provides a good bonding interface for the Ni-P coating, which produces a compact and excellent corrosion resistance composite coating that provides better protection for LZ91 magnesium alloy.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Chemistry, Physical
Yu-Kun Chih, Jhu-Lin You, Wei-Hsuan Lin, Yen-Hao Chang, Chun-Chieh Tseng, Ming-Der Ger
Summary: In this study, a novel approach using functional polyethyleneimine-glutaraldehyde copolymer (PEI-co-GA/Ag catalyst) composites was proposed to fabricate antibacterial stainless steel 316L. Unlike traditional silver mirror reaction, the introduction of functional polymers effectively improved the adhesion and distribution of Ag particles on the surface of 316LSS. SEM images showed that a large number of silver particles were retained and well dispersed in 316LSS after sintering. PEI-co-GA/Ag 316LSS exhibited excellent antimicrobial properties without releasing free silver ions to impact the surrounding environment. Furthermore, a probable mechanism for the enhancement of adhesion by the functional composites was proposed.
Article
Chemistry, Multidisciplinary
Yu-Ren Huang, Nen-Wen Pu, Guan-Min Wu, Yih-Ming Liu, Ming-Hsien Lin, Yi-Le Kwong, Siou-Cheng Li, Jeng-Kuei Chang, Ming-Der Ger
Summary: A facile low-cost method was used to produce nitrogen-doped holey graphene (N-HGE) for supercapacitors. The N-HGE composite electrode showed improved conductivity and accelerated ion transport due to the presence of numerous holes on the graphene sheets.
Article
Materials Science, Multidisciplinary
Kuei-Ping Liu, Jhu-Lin You, Shun-Yi Jian, Yen-Hao Chang, Chun Chieh Tseng, Ming-Der Ger
Summary: This study proposes an improved technique for modifying the surface characteristics of the WE43 magnesium alloy through electropolishing to enhance its corrosion resistance and biocompatibility. The results indicate that surface roughness significantly affects the corrosion resistance of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
