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Maximizing the potential applications of plasma electrolytic oxidation coatings produced on Mg-based alloys in anti-corrosion,antibacterial,and photocatalytic targeting through harnessing the LDH/PEO dual structure

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Journal of Magnesium and Alloys 2024年第7期12卷 2674-2694页

作者： Elham Nikoomanzari Arash fattah-alhosseini Department of Materials Engineering Faculty of EngineeringBu-Ali Sina UniversityHamedanIran

There is an increasing interest in the development of Mg alloys,both for industrial and biomedical applications,due to their favorable characteristics such as being lightweight and ***,the inadequate corrosion resistance and lack of antibacterial properties pose significant challenges in the industrial and biomedical applications,necessitating the implementation of advanced coating engineering *** electrolytic oxidation(PEO)has emerged as a preferred coating technique because of its distinctive properties and successful surface modification ***,there is a continuous need for further enhancements to optimize the performance and functionalities of protective surface *** integration of layered double hydroxide(LDH)into PEO coatings on Mg alloys presents a promising approach to bolstering protective *** thorough review delves into the latest developments in integrating LDH into PEO coatings for corrosion-related *** particularly emphasizes the significant improvements in corrosion resistance,antibacterial effectiveness,and photocatalytic performance resulting from the incorporation of LDH into PEO *** two key mechanisms that enhance the corrosion resistance of PEO coatings containing LDH are the anion exchangeability of the LDH structure and the pore-sealing ***,the antibacterial activity of PEO coatings with LDH stemmed from the release of antibacterial agents stored within the LDH structure,alterations in pH levels,and the photothermal conversion ***,by incorporating LDH into PEO coatings,new opportunities emerge for tackling environmental issues through boosted photocatalytic properties,especially in the realm of pollutant degradation.

关键词： Mg alloy PEO LDH Corrosion Antibacterial activity Photocatalytic degradation

Impressive strides in amelioration of corrosion behavior of Mg-based alloys through the PEO process combined with surface laser process: A review

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Journal of Magnesium and Alloys 2023年第12期11卷 4390-4406页

作者： Arash fattah-alhosseini Razieh Chaharmahali Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

The unsatisfactory corrosion properties of Mg-based alloys pose a significant obstacle to their widespread application. Plasma electrolytic oxidation(PEO) is a prevalent and effective coating method that produces a ceramic-like oxide coating on the surface of Mg-based alloys,enhancing their resistance to corrosion. Research has demonstrated that PEO treatment can substantially improve the corrosion performance of alloys based on magnesium in the short term. In an effort to enhance the corrosion resistance of PEO coatings over an extended period of time, researchers have turned their attention to the use of laser processes as both pre-and post-treatments in conjunction with the PEO process. Various laser processes, such as laser shock melting(LSM), laser shock adhesion(LSA), laser shock texturing(LST), and laser shock peening(LSP), have been investigated for their potential to improve PEO coatings on Mg substrates and their alloys. These laser melting processes can homogenize and alter the microstructure of Mg-based alloys while leaving the bulk material unchanged, thereby modifying the substrate surface. However, the porous and rough structure of PEO coatings, with their open and interconnected pore structure, can reduce their long-term corrosion resistance. As such, various laser processes are well-suited for surface modification of these coatings. This study will first examine the PEO process and the various types of laser processes used in this process, before investigating the corrosion behavior of PEO coatings in conjunction with laser pre-and post-treatment processes.

关键词： Mg and its alloy Laser surface texturing Corrosion behavior PEO process

ASSESSMENT OF A CENTRAL DIFFERENCE FINITE VOLUME SCHEME FOR MODELING OF CAVITATING FLOWS USING PRECONDITIONED MULTIPHASE EULER EQUATIONS

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Journal of Hydrodynamics 2011年第3期23卷 302-313页

作者： HEJRANFAR Kazem fattah-HESARY Kasra Aerospace Engineering Department Sharif University of Technology

A numerical treatment for the prediction of cavitating flows is presented and assessed. The algorithm uses the preconditioned multiphase Euler equations with appropriate mass transfer terms. A central difference finite volume scheme with suitable dissipation terms to account for density jumps across the cavity interface is shown to yield an effective method for solving the multiphase Euler equations. The Euler equations are utilized herein for the cavitation modeling, because some certain characteristics of cavitating flows can be obtained using the solution of this system of equations with relative low computational effort. In addition, the Euler equations are appropriate for the assessment of the numerical method used, because of the sensitivity of the solution to the numerical instabilities. For this reason, a sensitivity study is conducted to evaluate the effects of various parameters, such as numerical dissipation coefficients and grid size, on the accuracy and performance of the solution. The computations are performed for steady cavitating flows around the NACA 0012 and NACA 66 （MOD） hydrofoils and also an axisymmetric hemispherical fore-body under different conditions and the results are compared with the available numerical and experimental data. The solution procedure presented is shown to be accurate and efficient for predicting steady sheet- and super-cavitation for 2D/axisymmetric geometries.

关键词： cavitating flows preconditioned multiphase Euler equations interface capturing method central difference FVM

Passive Behavior of Ultra-Fine-Grained 1050 Aluminum Alloy Produced by Accumulative Roll Bonding in a Borate Buffer Solution

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Acta Metallurgica Sinica(English Letters) 2015年第10期28卷 1222-1229页

作者： Arash fattah-alhosseini Seyed Omid Gashti Department of Materials Engineering Bu-Ali Sina University

In this study, the effect of the ARB process on the passive behavior of ultra-fine-grained 1050 aluminum alloy in a borate buffer solution（p H 6.0） has been investigated. The result of the microhardness tests revealed that the microhardness values increase with an increasing number of ARB cycles. The potentiodynamic polarization plots revealed that the higher number of cycles for the specimens proceeds with the ARB process rather than annealing yield to lower corrosion and passive current densities and more noble corrosion potential values. Moreover, electrochemical impedance spectroscopy measurements showed that increasing the number of ARB cycles offers better conditions for forming the passive films.

关键词： Aluminum Polarization Passivation Electrochemical impedance spectroscopy (EIS)

Optimization of preparation conditions of Fe-Co nanoparticles in low-temperature CO oxidation reaction by taguchi design method

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Journal of Natural Gas Chemistry 2012年第4期21卷 415-420页

作者： Abolfazl Biabani Mehran Rezaei Zohreh fattah Catalyst and Advanced Materials Research Laboratory Chemical Engineering DepartmentFaculty of EngineeringUniversity of KashanKashan P.O.Box ***Iran Institute of Nanoscience and Nanotechnology University of KashanKashan P.O.Box ***Iran

Mixed iron-cobalt oxide （Co/Fe molar ratio = 1/5） are prepared using a simple co-precipitation procedure and studied for the catalytic oxidation of carbon monoxide. In particular, the effects of a range of preparation variables such as pH value when precipitation, aging temperature, precipitation agent type and aging time are investigated on the catalytic performance of synthesized Fe-Co oxides in CO oxidation reaction. In addition, the preparation factors were optimized by Taguchi design method. The optimized sample was characterized by XRD, N2 adsortion/desorption, TEM and TGA/DTA techniques. The results reveal that the optimized sample shows a mesoporous structure with a narrow pore size distribution centered in the range of 2-7 nm. The sample prepared under optimized conditions has high activity and stability toward removal of carbon monoxide at lower temperatures. It is shown that different preparation variables influence the catalytic performance of Fe-Co oxide in CO oxidation reaction.

关键词： Fe Co nanoparticles experimental design CO oxidation

Surface characterization and corrosion behavior of calcium phosphate(Ca-P)base composite layer on Mg and its alloys using plasma electrolytic oxidation(PEO):A review

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Journal of Magnesium and Alloys 2021年第1期9卷 21-40页

作者： Razieh Chaharmahali Arash fattah-alhosseini Kazem Babaei Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

Magnesium has been known as an appropriate biological material on account of its good biocompatibility and biodegradability properties in addition to advantageous mechanical *** and its alloys are of poor corrosion *** high corrosion rate leads to its quick decomposition in the corrosive ambiance and as a result weakening its mechanical properties and before it is repaired,it will *** corrosion and degradation rate must be controlled in the body to advance the usage of Mg and its alloys as *** techniques have been utilized to boost biological *** electrolytic oxidation(PEO)can provide porous and biocompatible coatings for implants among various *** implants are generally supposed to show enough corrosion resistance and mechanical integrity in the body *** research has been carried out in order to produce PEO coatings containing calcium phosphate *** phosphates are really similar to bone mineral composition and present great *** present study deals with the usage of calcium phosphates as biocompatible coatings applied on Mg and its alloys to study the properties and control the corrosion rate.

关键词： Mg alloys Calcium phosphate(Ca-P) Plasma electrolytic oxidation(PEO) Surface characterization Corrosion behavior

Improving the wear resistance of plasma electrolytic oxidation(PEO)coatings applied on Mg and its alloys under the addition of nano-and micro-sized additives into the electrolytes:A review

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Journal of Magnesium and Alloys 2021年第4期9卷 1167-1189页

作者： Maryam Molaei Kazem Babaei Arash fattah-alhosseini Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

As an efficient surface modification approach,the plasma electrolytic oxidation(PEO)technique can boost the capability of wear protection in Mg and its alloys by applying a hard and thick ceramic *** this procedure,more efficient protection can be acquired via adding additives(in the form of particle,powder,sheet,etc.)into solutions and producing composite *** additives result in more efficient protection against wear via getting stuck in the cracks and pores of coatings and rising the thickness,hardness,and diminishing the porosity size and *** efficiency of each additive can be changed owing to its intrinsic properties like melting point,size,participation type(reactive,partly reactive,or inert)and potential of *** this review,the effects of distinct additives in nano-and micro-scale size on wear behavior of PEO coatings on Mg and its alloys is going to be reviewed.

关键词： Plasma electrolytic oxidation(PEO) Mg alloys Wear behavior Nano-sized additives Micro-sized additives

Impressive strides in amelioration of corrosion and wear behaviors of Mg alloys using applied polymer coatings on PEO porous coatings:A review

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Journal of Magnesium and Alloys 2022年第5期10卷 1171-1190页

作者： Arash fattah-alhosseini Razieh Chaharmahali Kazem Babaei Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

Magnesium(Mg)and its alloys have received much attention in a lot of areas due to their special chemical and physical ***,high corrosion rates are a limiting *** plasma electrolytic oxidation(PEO)technique is a simple approach to place an oxide film on the surface of light metals like Mg *** method has been considered for controlling the rate of corrosion and improving some other *** the other hand,PEO coatings cannot make enough protection of Magnesium alloys for a long time due to porosity and fine ***,PEO-based composite coatings are used to make adequate corrosion protection on the Mg alloys *** popularity of these coatings is due to their good corrosion resistance,simplicity,high coating capability,and cost-effectiveness in complex *** of an organic layer on the surface of PEO coating is one of the effective methods to close the defects and thus prevent the corrosive species penetration into the *** the PEO coating with a polymer layer can be a good solution to control the amount of damage and improve the corrosion and abrasion *** addition,PEO coating can eliminate the problems of insufficient adhesion of polymer coatings and is considered as a suitable base for composite *** review paper presents the corrosion and abrasion behavior of the PEO/Polymer dual coating system on Mg *** the fundamental role of coatings thickness and morphology in wear and corrosion behavior,these aspects have been highly discussed in this study.

关键词： Composite coating Mg alloys PEO Polymer Corrosion properties Wear resistance

Recent advances in flat sheet mixed matrix membrane modified by Mg-based layered double hydroxides(LDHs)for salt and organic compound separations

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Journal of Magnesium and Alloys 2024年第6期12卷 2182-2200页

作者： Payam Veisi Arash fattah-alhosseini Mosab Kaseem Department of Materials Engineering Faculty of EngineeringBu-Ali Sina UniversityHamedanIran Corrosion and Electrochemistry Laboratory Department of Nanotechnology and Advanced Materials EngineeringSejong UniversitySeoul 05006Republic of Korea

Magnesium(Mg)is a widely used and attractive metal,known for its unique physical and chemical properties,and it has been employed in the manufacture of many practical *** Double Hydroxides(LDHs),particularly Mg-based LDHs,rank among the most prevalent two-dimensional materials utilized in separation processes,which include adsorption,extraction,and membrane *** high popularity of Mg-based LDHs in separation applications can be attributed to their properties,such as excellent hydrophilicity,high surface area,ion exchangeability,and adjustable interlayer ***,polymer membranes play a pivotal role in semi-industrial and industrial separation ***,the development of polymer membranes and the mitigation of their limitations have emerged as compelling topics for *** methods exist to enhance the separation performance and anti-fouling properties of polymer *** these,incorporating additives into the membrane polymer matrix stands out as a cost-effective,straightforward,readily available,and efficient *** use of Mg-based LDHs,either in combination with other materials or as a standalone additive in the polymer membrane matrix,represents a promising strategy to bolster the separation and anti-fouling efficacy of flat sheet mixed matrix polymer *** review highlights Mg-based LDHs as high-potential additives designed to refine flat sheet mixed matrix polymer membranes for applications in wastewater treatment and brackish water desalination.

关键词： Mg-based layered double hydroxides(LDHs) Mixed matrix membrane Polymeric membrane Water and wastewater treatment Brackishwater desalination