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Mashtalyar DV, Nadaraia KV, Belov EA, Imshinetskiy IM, Sinebrukhov SL, Gnedenkov SV. Features of Composite Layers Created Using an Aqueous Suspension of a Fluoropolymer. Polymers (Basel) 2022; 14:4667. [PMID: 36365659 PMCID: PMC9656654 DOI: 10.3390/polym14214667] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/24/2022] [Accepted: 10/28/2022] [Indexed: 09/08/2023] Open
Abstract
This paper presents a method for the formation of composite-polymer-containing coatings on MA8 Mg alloy by plasma electrolytic oxidation (PEO), followed by the deposition of a fluoropolymer from an aqueous suspension of superdispersed polytetrafluoroethylene. The Scanning Electron Microscope(SEM), Energy Dispersive Spectroscopy(EDS), and X-ray Diffraction(XRD) analyses established morphological features as well as elemental and phase composition of composite coatings. The fact that the pores are filled with a fluoropolymer has been experimentally confirmed. An assessment of the corrosion properties of formed composite coatings revealed a decrease in the corrosion current density by more than four orders of magnitude in comparison with the base PEO layer. The highest resistance to the damaging effects of a corrosive environment, according to the results of long-term exposure tests, was demonstrated by coatings after three treatments with polytetrafluoroethylene. The obtained polymer-containing coatings have antifriction properties, reducing the wear of the coatings by more than 27-fold in comparison with the base PEO layer. It was revealed that composite coatings have superhydrophobic properties: the value of the contact angle reaches 154°, and the hysteresis of the contact angle is less than 10°.
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Wang M, Zhang D, Yang Z, Yang C, Tian Y, Liu X. A Contrastive Investigation on the Anticorrosive Performance of Stearic Acid and Fluoroalkylsilane-Modified Superhydrophobic Surface in Salt, Alkali, and Acid Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:10279-10292. [PMID: 32787017 DOI: 10.1021/acs.langmuir.0c02080] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Stearic acid and fluoroalkylsilane are widely used in chemical modification to fabricate superhydrophobic surfaces in corrosion-resistant exploration. However, extensive works have just explored their anticorrosive performance in salt solution. Very rare work has focused on comparing their corrosion-resistant performance in corrosive solution (salt, alkali, and acid) systematically. In this study, two kinds of superhydrophobic surfaces were obtained on laser-processed rough IN304 surface after the stearic acid and FAS modification processes, respectively. The investigation and comparison of anticorrosion performance in salt, alkali, and acid electrolyte were carried out via potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The promotion mechanism or impairing mechanism was further proposed based on the results of surface wettability, surface morphology, and X-ray photoelectron spectroscopy. Besides, the long-term anticorrosion performance and the stability of surface wettability were also investigated. It is hoped that these research findings could provide an explicit guidance of suitable anticorrosion methods selection for metals in different kinds of corrosive solution (salt, alkali, and acid), which will further raise the promising prospect of functional surfaces for practical applications in industry.
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Affiliation(s)
- Meng Wang
- School of Mechanical Engineering, Tianjin University, Tianjin 300054, China
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin 300072, China
| | - Dawei Zhang
- School of Mechanical Engineering, Tianjin University, Tianjin 300054, China
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin 300072, China
| | - Zhen Yang
- School of Mechanical Engineering, Tianjin University, Tianjin 300054, China
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin 300072, China
- School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Chengjuan Yang
- School of Mechanical Engineering, Tianjin University, Tianjin 300054, China
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin 300072, China
| | - Yanling Tian
- School of Mechanical Engineering, Tianjin University, Tianjin 300054, China
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin 300072, China
- School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Xianping Liu
- School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom
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Dou J, Zhao Y, Lu L, Gu G, Yu H, Chen C. Effect of the second-step voltages on the structural and corrosion properties of silicon-calcium-phosphate (Si-CaP) coatings on Mg-Zn-Ca alloy. ROYAL SOCIETY OPEN SCIENCE 2018; 5:172410. [PMID: 30473800 PMCID: PMC6227930 DOI: 10.1098/rsos.172410] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 08/31/2018] [Indexed: 06/09/2023]
Abstract
The applications of magnesium (Mg) alloys as biodegradable orthopedic implants are mainly restricted due to their rapid degradation rate in the physiological environment. In this study, Si-CaP micro-arc oxidation (MAO) coatings were prepared on a Mg-Zn-Ca alloy by a second-step MAO process at different voltages in order to decrease the degradation rate and increase the bioactivity of the alloy. The microstructure and morphology of the samples were characterized using XRD, FT-IR SEM and EDS. The degradation behaviours of samples were evaluated using electrochemical techniques, and immersion tests in simulated body fluid (SBF). The results indicate that the morphology of the Si-CaP coatings changed significantly with the increase in Ca/P ratio as the second-step voltage increased. The Si-CaP containing coating produced at 450 V could significantly decrease the degradation rate of Mg and caused a slow increase in pH of the SBF solution. The haemolysis test concluded that the coating C3 did not cause a haemolytic reaction. The corrosion resistance of Mg alloy was greatly improved with the Si-CaP coatings, and the Mg alloy with Si-CaP coating prepared at 450 V had the best corrosion resistance, which indicates that the Si-CaP coatings are promising for improving the biodegradation properties of Mg-based orthopedic implants. Haemolysis tests indicated that the Si-CaP coating prepared at 450 V conforms to the given standard (YY/T0127.1-93).
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Affiliation(s)
- Jinhe Dou
- Shenzhen Research Institute of Shandong University, Shenzhen 518057, Guangdong, P. R. China
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China
| | - Yupeng Zhao
- Shenzhen Research Institute of Shandong University, Shenzhen 518057, Guangdong, P. R. China
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China
| | - Lu Lu
- Shenzhen Research Institute of Shandong University, Shenzhen 518057, Guangdong, P. R. China
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China
| | - Guochao Gu
- Shenzhen Research Institute of Shandong University, Shenzhen 518057, Guangdong, P. R. China
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China
| | - Huijun Yu
- Shenzhen Research Institute of Shandong University, Shenzhen 518057, Guangdong, P. R. China
- Key Laboratory of High-Efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, School of Mechanical Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China
- National Demonstration Center for Experimental Mechanical Engineering Education (Shandong University), School of Mechanical Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China
| | - Chuanzhong Chen
- Shenzhen Research Institute of Shandong University, Shenzhen 518057, Guangdong, P. R. China
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, P. R. China
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Al Zoubi W, Kamil MP, Yang HW, Ko YG. Electron-Donor and -Acceptor Agents Responsible for Surface Modification Optimizing Electrochemical Performance. ACS APPLIED MATERIALS & INTERFACES 2017; 9:28967-28979. [PMID: 28771306 DOI: 10.1021/acsami.7b05773] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The electrochemical roles of electron-donor and -acceptor agents in surface reforming of magnesium alloy were investigated via plasma electrolysis. The surface modification was performed in an aluminate-based electrolyte, having urea and hydrazine with inherent molecular structures, which might act as electron acceptor and donor during plasma-assisted electrochemical reaction. The presence of hydrazine working as donor would promote the formation of magnesium aluminates in the oxide layer, resulting in superior compactness of the oxide layer to that when urea was used as the working as acceptor since the precipitation of MgCO3 was favored in the electrolyte with urea. The thickness of the oxide layer formed by a combination of urea and hydrazine was higher than urea, while the porosity was higher than hydrazine. The electrochemical performance was enhanced in the order of hydrazine, urea and hydrazine combined, and urea, which was discussed on the basis of impedance interpretation.
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Affiliation(s)
- Wail Al Zoubi
- Materials Electrochemistry Group, School of Materials Science and Engineering, Yeungnam University , Gyeongsan 38541, Republic of Korea
| | - Muhammad Prisla Kamil
- Materials Electrochemistry Group, School of Materials Science and Engineering, Yeungnam University , Gyeongsan 38541, Republic of Korea
| | - Hae Woong Yang
- Materials Electrochemistry Group, School of Materials Science and Engineering, Yeungnam University , Gyeongsan 38541, Republic of Korea
| | - Young Gun Ko
- Materials Electrochemistry Group, School of Materials Science and Engineering, Yeungnam University , Gyeongsan 38541, Republic of Korea
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In vivo study of microarc oxidation coated biodegradable magnesium plate to heal bone fracture defect of 3mm width. Colloids Surf B Biointerfaces 2017; 158:147-156. [PMID: 28688364 DOI: 10.1016/j.colsurfb.2017.06.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 06/12/2017] [Accepted: 06/21/2017] [Indexed: 11/22/2022]
Abstract
Microarc oxidation (MAO) coated magnesium (Mg) with improved corrosion resistance appeal increasing interests as a revolutionary biodegradable metal for fractured bone fixing implants application. However, the in vivo corrosion degradation of the implants and bone healing response are not well understood, which is highly required in clinic. In the present work, 10μm and 20μm thick biocompatible MAO coatings mainly composed of MgO, Mg2SiO4, CaSiO3 and Mg3(PO4)2 phases were fabricated on AZ31 magnesium alloy. The electrochemical tests indicated an improved corrosion resistance of magnesium by the MAO coatings. The 10μm and 20μm coated and uncoated magnesium plates were separately implanted into the radius bone fracture site of adult New Zealand white rabbits using a 3mm width bone fracture defect model to investigate the magnesium implants degradation and uninhibited bone healing. Taking advantage of the good biocompatibility of the MAO coatings, no adverse effects were detected through the blood test and histological examination. The implantation groups of coated and uncoated magnesium plates were both observed the promoting effect of bone fracture healing compared with the simple fracture group without implant. The releasing Mg2+ by the degradation of implants into the fracture site improved the bone fracture healing, which is attributed to the magnesium promoting CGRP-mediated osteogenic differentiation. Mg degradation and bone fracture healing promoting must be tailored by microarc oxidation coating with different thickness for potential clinic application.
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Kamil MP, Kaseem M, Ko YG. Soft plasma electrolysis with complex ions for optimizing electrochemical performance. Sci Rep 2017; 7:44458. [PMID: 28281672 PMCID: PMC5345099 DOI: 10.1038/srep44458] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Accepted: 02/07/2017] [Indexed: 12/02/2022] Open
Abstract
Plasma electrolytic oxidation (PEO) was a promising surface treatment for light metals to tailor an oxide layer with excellent properties. However, porous coating structure was generally exhibited due to excessive plasma discharges, restraining its performance. The present work utilized ethylenediaminetetraacetic acid (EDTA) and Cu-EDTA complexing agents as electrolyte additives that alter the plasma discharges to improve the electrochemical properties of Al-1.1Mg alloy coated by PEO. To achieve this purpose, PEO coatings were fabricated under an alternating current in silicate electrolytes containing EDTA and Cu-EDTA. EDTA complexes were found to modify the plasma discharging behaviour during PEO that led to a lower porosity than that without additives. This was attributed to a more homogeneous electrical field throughout the PEO process while the coating growth would be maintained by an excess of dissolved Al due to the EDTA complexes. When Cu-EDTA was used, the number of discharge channels in the coating layer was lower than that with EDTA due to the incorporation of Cu2O and CuO altering the dielectric behaviour. Accordingly, the sample in the electrolyte containing Cu-EDTA constituted superior corrosion resistance to that with EDTA. The electrochemical mechanism for excellent corrosion protection was elucidated in the context of equivalent circuit model.
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Affiliation(s)
- Muhammad Prisla Kamil
- School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Mosab Kaseem
- School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Young Gun Ko
- School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
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Li Z, Yuan Y. Preparation and characterization of superhydrophobic composite coatings on a magnesium–lithium alloy. RSC Adv 2016. [DOI: 10.1039/c6ra13194h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report a superhydrophobic organophosphonate composite coating on a magnesium–lithium alloy surface, which exhibits excellent water-repellent and corrosion resistance properties.
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Affiliation(s)
- Zhijun Li
- Department of Chemistry
- Queen's University
- Kingston
- Canada
| | - Yi Yuan
- Department of Chemistry
- Zhejiang University
- Hangzhou
- P. R. China
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Niazi H, Golestani-Fard F, Wang W, Shahmiri M, Zargar HR, Alfantazi A, Bayati R. Structure-property correlation in EEMAO fabricated TiO₂-Al₂O₃ nanocomposite coatings. ACS APPLIED MATERIALS & INTERFACES 2014; 6:5538-5547. [PMID: 24665933 DOI: 10.1021/am405938n] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We grew TiO2-Al2O3 nanocomposite coatings on titanium substrates by electrophoretic enhanced microarc oxidation (EEMAO) technique under several voltages and established a correlation between microstructure, surface hardness, and corrosion resistance of the coatings in sulfuric acid and sodium chloride solutions. Structural analysis revealed that the coatings contained anatase, rutile, alumina, and tialite phases. Formation kinetics of tialite phase was studied. It was found that increasing the voltage gives rise to a coarser morphology, i.e., larger pore size, and incorporation of more alumina nanoparticles into the layers. It is shown that surface hardness of the titanium substrates increased by a factor of 4 following EEMAO treatment. Corrosion resistance of titanium was enhanced significantly. Resistance against pitting corrosion was improved as well. We proposed a formation mechanism for the TiO2-Al2O3 composite coatings at different voltages based on the chemical and electrochemical foundations.
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Affiliation(s)
- H Niazi
- School of Metallurgy and Materials Engineering, Iran University of Science and Technology , Tehran, Iran
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