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M. R. Nakhaei,N. B. Mostafa Arab,Gh. Naderi,M. Hoseinpour Gollo 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.3
In this paper, polypropylene-clay nanocomposite sheets of 2 mm thickness with 0 wt%, 3 wt% and 5 wt% nanoclay are butt welded using a CO2 laser to determine the effect of clay content and laser process parameters on weld tensile strength. For this purpose, Taguchi parametric design and optimization method was used to design experiments and develop a model to predict weld tensile strength as a function of clay content and laser process parameters such as laser power, welding speed and focal position. The adequacy of the model was checked using analysis of variance and by conducting extra confirmation tests. Using Taguchi optimization approach, the optimum levels of parameters were determined. The results indicated that an increase in clay content and welding speed decreased the weld strength, whereas increasing laser power increased weld strength. Furthermore, increase in focal position showed an increasing and then a decreasing effect on weld strength.
E. Naderi,A. Davoodi,H. R. Jafarian 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
Corrosion of WE43 magnesium alloys after equal-channel angular pressing (ECAP) process with one pass (1P), two pass(2P), three pass (3P) and four pass (4P) were investigated as a function of immersion time in 37 ± 2 °C simulated body fluid(SBF) to imitate body corrosion environment utilizing AC electrochemical impedance spectroscopy (EIS), Potentiodynamicpolarization (PDP) curves, SEM and optical microscopy techniques in addition to EDS analysis. Among the samples, 2P and3P samples illustrated better corrosion resistance not only among all the samples but also as a function of elapsed immersiontime in SBF media. Better corrosion resistance was related to precipitation of β particles with fair and large volume fractionwhich served as cathodic reaction sites. Uniform distribution of the reactions not only reduce the severity of micro-galvaniccorrosion but also by passing immersion time, anodic reaction dissolved magnesium substrate next to and around β phaseand separate them from the surface which resulted loss of cathodic sites and reduction of corrosion. Additionally, the morphologyof the β phase was changed from needle-like in 1P & 2P samples to spherical one in 3P & 4P samples. It is believeddiminished corrosion resistance of 4P samples not only among the ECAPed samples but also as a function of immersiontime, were related to coarsening of spherical β phase. In another word, corrosion reactions amplified and continued whileseparation of the phase from the surface was delayed due to its larger size.
Evaluation of cathodic disbondment of epoxy coating containing azole compounds
M. Mahdavian,R. Naderi,M. Peighambari,M. Hamdipour,S.A. Haddadi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Cathodic disbonding of the epoxy coatings on the mild steel was evaluated in 3.5% NaCl solution, wherebenzimidazole, benzothiazole and benzotriazole were used as additives in the coatings. Also, theelectrochemical behavior of coatings delaminating in NaCl solution from a small artificial defect and thebare mild steel samples in the 3.5% NaCl solution containing the azole compounds was evaluated byelectrochemical impedance spectroscopy at cathodic polarization condition. Results showed that theazole compounds were not immobilized in the coating as they could leach out and act as cathodicinhibitor at defect site and disbonding front.
M. HosseinpourRokni,R. Naderi,M. Soleimani,A.R. Jannat,M. Pourfath,M. Saybani 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
The electrochemical behavior of 5083 aluminum alloy in an alkaline solution in the absence and presenceof two green additives extracted from Mentha piperita L ‘MP’ and Lawsonia inermis ‘LI’ was analyzed inthis study. Corrosion-related investigations disclosed the mixed-type adsorptive function of the compounds,which reduced Al parasitic dissolutions and consequent H2 evolutions by about 80% at800 ppm of each additive. The performance made the Al alkaline corrosion more uniform, probably byremoving water molecules from the surface as approved by FE-SEM and EDS. Quantum calculations indicatedthe molecular adsorption type and the role of influencing functional groups, particularly =O and –COO(H,CH3) which were the most influencing. These results were also confirmed by FT-IR analysis. Theeffect of the additives on the dissolution of Al anode was investigated under different discharging rates,clarifying how the employed electrolyte containing the green extracts could improve Al anode capacitydensity by ~2.8 Ah/g and enhance the anode utilization efficiency by ~94% in an air battery. The resultsof this study can open the way for future investigations to replace the synthetic anti-corrosion additivesof Al air-batteries with non-toxic and biodegradable organic ones having similar corrosion inhibition performancewithout restricting anode discharge currents.
M. Toorani,M. Aliofkhazraei,R. Naderi,M. Golabadi,A. Sabour Rouhaghdam 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
Direct current Plasma Electrolytic Oxidation (PEO) in a bath containing lanthanum nitrate, as pretreatment was performed on the AZ31 magnesium alloy. Incorporation of lanthanum in PEO coating was proved by SEM/EDS analysis. Fabricated oxide coatings were sealed with an epoxy layer. The role of lanthanum nitrate in the protective properties of the fabricated double top layer and its effective mechanism were investigated using electrochemical techniques and thermodynamic calculations. The double layer coatings containing lanthanum nitrate provided better protective properties in comparison to La-free double layer coating without any degradation after 42 days of immersion in 3.5% NaCl solution.
S.M. Orouji,R. Naderi,M. Mahdavian 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
This work aims to study the effect of H2O2 in acid treatment solution on the protective properties of silane coating on mild steel. To this end, different concentrations of H2O2 up to 250 ppm were added to the sulfuric acid solution. The surface morphology, surface roughness, wettability and corrosion behavior of mild steel in the acid treatment solution were studied by SEM, GIXRD, AFM, contact angle, OCP and EIS. Then, a silane coating was applied onto the acid treated samples. It was found that H2O2 at optimal concentration (150 ppm) can improve corrosion protective properties of the silane coating.
M. Ghaedi,N. Taghavimoghadam,S. Naderi,R. Sahraei,A. Daneshfar 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
In this research Zn(OH)2 nanoparticles loaded on activated carbon (Zn(OH)2-NPs-AC) as novel adsorbent and raw multiwalled carbon nanotube (MWCNT) were applied for efficient removal of bromothymol blue (BTB). Both adsorbent has been characterized with different techniques such and SEM, XRD and UV–vis spectrometry. Their size was less than 100 nm. In the removal process the variables are pH,temperature, concentration of BTB, amount of adsorbent and contact time that their influence on removal of BTB was optimized using one at a time approach in batch procedure. Adsorptions of BTB on bath adsorbent depend highly on pH. Following the investigation of temperature effect, the thermodynamic parameters including change in entropy, enthalpy and free Gibbs energy were calculated. For both adsorbents, positive value of enthalpy and negative value of DG0 show routine feasibility of adsorption using energy. At optimum value of variables, the removal processes onto both adsorbent have high adsorption capacity for best fitting model Langmuir, i.e. for Zn(OH)2-NP-AC and 150 mg/g for PAC. The adsorption rates were well explained with pseudo second order and interparticle diffusion model. It is expected that there could an increase in the number of reactive sites due to their expected high volume, pore size and high surface area.