scholarly journals Microstructural and Corrosion Properties of Burnished 6060 Aluminum Alloy

2021 ◽  
Vol 11 (10) ◽  
pp. 4460
Author(s):  
Debora Logori ◽  
Luca Pezzato ◽  
Alessio Giorgio Settimi ◽  
Denise Hanoz ◽  
Manuele Dabalà
Keyword(s):  
Aluminum Alloy ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Protective Layer ◽  
Oxide Coating ◽  
Copper Nitrate ◽  
Industrial Applications ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
Layer Composition

A process for producing a black oxide coating on aluminum alloy was investigated in the present work. The blackening process is widely used in industrial applications, but it was not deeply studied for aluminum alloys. The aim of this work is to study the black coating obtained on AA6060 surfaces employing two different solutions, both containing potassium permanganate, copper nitrate and nitric acid. The first solution carried out the coloring treatment at 50 °C, whereas the second one was done at room temperature. Different immersion times were investigated. The morphology of the coating was investigated by means of optical and electron microscopy to evaluate the color of the layer and the presence of defects, porosities, and cracks. X-ray diffraction analysis was performed to evaluate the protective layer composition. The corrosion properties were studied with potentiodynamic polarization tests and electrochemical impedance spectroscopy tests. The results showed that the blackening process performed at room temperature, besides the clear advantages in term of costs and safety, obtained more uniform coatings with increased corrosion performance in comparison with the ones obtained at higher temperatures.

Physicochemical Characteristics of an Ultra-Thin Hydrophobic Trichlorosilanes Using SiO2 as Adhesion

2019 ◽  
Vol 796 ◽  
pp. 80-87
Author(s):  
Akinsanya Damilare Baruwa ◽  
Esther Titilayo Akinlabi ◽  
Oluseyi Philip Oladijo ◽  
Stephen Akinwale Akinlabi ◽  
Jeff Chinn
Keyword(s):  
Room Temperature ◽  
Electrochemical Impedance ◽  
Physicochemical Characteristics ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Natural Seawater ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrophobic Silane ◽  
Better Than

The aim of the research is to subject the three different silanes to chemical and electrochemical investigations in other to determine the most efficient organic compound. Three types of hydrophobic silanes [Tris (Trimethylsiloxy) silyethyl] dimethylchlorosilane (Alkyl); Tridecafloro-1,1,2,2-tetrahydrooctyltrichlorosilane (FOTS) and Henicosyl-1,1,2,2-tetrahydrododecyltricholrosilane (FDDTS) are presented and investigated. The three silanes are of different composition but are deposited at the same parameters and conditions. The chemical investigation was studied through (attenuated total reflection Fourier-transform infrared (ATR-FTIR) and x-ray diffraction (XRD), while the electrochemical study was conducted through EIS using natural seawater electrolyte at room temperature. From the investigation techniques, only electrochemical impedance results show that FDDTS performed better than both Alkyl and FOTS. The chemical analysis showed the presence of hydrophobic silane on all the coated samples, and no distinction can be drawn from associated peaks.

EIS Research of AW-7020 Alloy Joints Welded by FSW

2013 ◽  
Vol 199 ◽  
pp. 412-417 ◽  
Author(s):  
Krzysztof Dudzik ◽  
Adam Charchalis
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Impedance Spectroscopy ◽  
Friction Stir Welding ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
New Technology ◽  
Electrochemical Corrosion ◽  
Signal Amplitude ◽  
Corrosion Properties ◽  
Friction Stir

The results of corrosion properties research of aluminum alloy AW 7020 (AlZn5Mg1) welded by friction stir welding FSW were presented. Friction Stir Welding (FSW) a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. In the article the parameters for friction stir welding of sheets made of AlZn5Mg1 (7020) alloy was presented. The study was carried out in accordance with the requirements of the ASTM G 106. EIS measurement was performed in three electrode system in an artificial seawater (3.5% NaCl). Impedance studies were carried out at the corrosion potential. Changed voltage signal amplitude in the range ± 10 mV and frequency range of changes was as follows: 100 kHz - 0.1 Hz. Atlas 0531 EU & IA potentiostat was used for studies. The results of electrochemical impedance spectroscopy are presented in the form of parameters characterizing the corrosion process. Obtained results were statistically analyzed. The electrochemical impedance spectroscopy studies have shown that the joint welded by FSW has better electrochemical corrosion resistance than the native material - AW-7020 alloy. Original value are received results of the corrosion properties of new method friction stir welded AlZn5Mg1 alloy compared with the native material.

scholarly journals Room Temperature Detection of Acetone by a PANI/Cellulose/WO3Electrochemical Sensor

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Eider Aparicio-Martínez ◽  
Velia Osuna ◽  
Rocio B. Dominguez ◽  
Alfredo Márquez-Lucero ◽  
E. Armando Zaragoza-Contreras ◽  
...  
Keyword(s):  
Room Temperature ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
X Ray Diffraction ◽  
Acetone Concentration ◽  
Temperature Detection ◽  
Transmission Electron ◽  
Semiconducting Metal Oxides ◽  
Acetone Detection ◽  
Synthesized Materials

Chemical sensing based on semiconducting metal oxides has been largely proposed for acetone sensing, although some major technical challenges such as high operating temperature still remain unsolved. This work presents the development of an electrochemical sensor based on nanostructured PANI/cellulose/WO3composite for acetone detection at room temperature. The synthesized materials for sensor preparation were polyaniline (PANI) with a conductivity of 13.9 S/cm and tungsten trioxide (WO3) in monoclinic phase doped with cellulose as carbon source. The synthesized materials were characterized by high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), cyclic voltammetry (CV), and Raman spectroscopy. The composite was applied for acetone detection in the range of 0 to 100 ppmv at room temperature with electrochemical impedance spectroscopy (EIS) for monitoring resistance changes proportional to acetone concentration. The developed sensor achieved a calculated limit of detection of 10 ppm andR2of 0.99415 with a RSD of 5% (n=3) at room temperature. According to these results, the developed sensor is suitable for acetone sensing at room temperatures without the major shortcomings of larger systems required by high operating temperatures.

CuWO4 Nanoparticles: Investigation of Dielectric, Electrochemical Behaviour and Photodegradation of Pharmaceutical Waste

2019 ◽  
Vol 19 (11) ◽  
pp. 7026-7034 ◽  
Author(s):  
M. Thiruppathi ◽  
M. Vahini ◽  
P. Devendran ◽  
M. Arunpandian ◽  
K. Selvakumar ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Electrochemical Behaviour ◽  
Diclofenac Sodium ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Transmission Electron ◽  
Pharmaceutical Waste

The hydrothermally synthesized CuWO4 nanoparticles (NPs) were characterized with different analysis such as X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), High Resolution Transmission Electron Microscopy (HRTEM), Energy Dispersive X-ray Spectroscopy (EDX), Cyclic Voltammetry (CV), UV-Visible and Photoluminescence (PL) analysis. The prepared CuWO4 NPs were examined with Electrochemical Impedance Spectroscopy (EIS). SEM images show that CuWO4 NPs are highly spherical shaped morphology and porous in nature. The optical band gap of prepared CuWO4 NPs is found to be 2.12 eV. Photodegradation of diclofenac sodium (DFS) (medical waste) in the aqueous medium with CuWO4 NPs under visible light irradiation shows 98% degradation. The CuWO4 NPs was stable up to 5th cycle it can be used as a reusable photocatalyst for the DFS degradation. The electrical conductivity and dielectric properties of the CuWO4 NPs at room temperature is analyzed by EIS studies. The bulk conductivity value of the prepared nanoparticles is 1.477×10-5 S/cm at room temperature. The conductivity of CuWO4 NPs is found to be due to electrons movement. The CuWO4 NPs shows higher photocatalytic and electrocatalytic activity for decomposition of DFS and methanol electro-oxidation in alkaline medium respectively.

A novel Mg-Sn-Zn-Al-Mn magnesium alloy with superior corrosion properties

2021 ◽  
Vol 118 (5) ◽  
pp. 504
Author(s):  
Ali Ercetin
Keyword(s):  
Protective Layer ◽  
Xrd Analysis ◽  
Production Method ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Alloying Element ◽  
Corrosion Properties ◽  
Corrosion Behaviors ◽  
Element Addition ◽  
Hank’S Solution

The corrosion behaviors of the hot-pressed Mg-Sn-Zn-Al-Mn magnesium alloys with the addition of Al in different proportions have been investigated. Paraffin coating technique was applied to Mg powders before production. After debinding at 300 °C, the sintering process was applied at 610 °C under 50 MPa pressure for 70 min. All of the alloys were immersed in Hank’s solution for 10-days. The results indicated that the corrosion properties of the alloys were affected by the production method (hot pressing) and alloying element addition. After immersion, magnesium hydroxide (Mg(OH)2), hydroxyapatite (HA), and Mg-Al hydrotalcite structures were determined by the X-ray diffraction (XRD) analysis on the surfaces of Mg-Sn-Zn-Al-Mn alloys. The Mg-Al hydrotalcite protective layer was effective in preventing corrosion. Superior corrosion properties (weight loss: 1.2%, total volume of evolved H2 gas: 4 ml/cm2, corrosion rate: 0.39 mm/year) were obtained from TZAM5420 alloy (5 wt.%Sn, 4 wt.%Zn, 2 wt.%Al, 0.2 wt.%Mn).

Electrochemical Characteristics of the Rare Earth Compound Coating on 6061 Aluminum Alloy

2011 ◽  
Vol 71-78 ◽  
pp. 2361-2365 ◽  
Author(s):  
Yu Qing Wen ◽  
Hui Min Meng ◽  
Wei Shang ◽  
Xiu Juan Jiang
Keyword(s):  
Aluminum Alloy ◽  
Rare Earth ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Oxide Coating ◽  
Chemical Conversion ◽  
Anodic Oxide ◽  
Electrochemical Characteristics ◽  
X Rays ◽  
Rare Earth Compound

The composite coatings were prepared on aluminum alloy by anodizing and chemical conversion method. The coatings consisted of a anodic oxide coating and a rare earth conversion coating. The surface morphology and composition of the composite coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive X-rays (EDX). The electrochemical properties of the different samples were researched by Potentiodynamic polarisation and electrochemical impedance spectroscopy in a 3.5-wt.% NaCl solution. The results showed that corrosion current density of the sample with composite coatings was 3.611×10-9 A·cm-2, impedance was 6.107×105 Ω·cm-2. The composite coatings had better corrosion resistance than the sample with anodic oxide film and the aluminum alloy substrate.

Influence of Joining Method on Electrochemical Corrosion Properties of 7020 Aluminum Alloy Joints

2015 ◽  
Vol 220-221 ◽  
pp. 589-594
Author(s):  
Krzysztof Dudzik
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Impedance Spectroscopy ◽  
Friction Stir Welding ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Signal Amplitude ◽  
Metallographic Analysis ◽  
Corrosion Properties ◽  
Friction Stir

The results of corrosion properties research of aluminum alloy AW 7020 (AlZn5Mg1) welded by friction stir welding (FSW) and MIG were presented. Friction Stir Welding (FSW) – a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. In the paper, the parameters for friction stir welding of sheets made of AlZn5Mg1 [7020] alloy were presented as well as parameters for MIG. Metallographic analysis of bonds showed a proper structural construction of both, the FSW and MIG welded 7020 aluminum alloys.The study was carried out in accordance with the requirements of the ASTM G 106. EIS measurement was performed in three-electrode system in artificial seawater (3.5% NaCl). Impedance studies were carried out at the corrosion potential. Changed voltage signal amplitude in the range ±10 mV and frequency range of changes was as follows: 100 kHz – 0.1 Hz. Atlas 0531 EU & IA potentiostat was used for studies.The results of electrochemical impedance spectroscopy are presented in the form of parameters characterizing the corrosion process. Obtained results were statistically analyzed.The electrochemical impedance spectroscopy studies have shown that the joint welded by FSW has better electrochemical corrosion resistance than the joint welded by MIG and the native material – AW-7020 alloy.Original value are received results of the corrosion properties of new method friction stir welded AlZn5Mg1 alloy compared with traditional MIG method and the native material.

scholarly journals The influence of Co2+ concentration on som the properties of the electrodeposited zinc–cobalt alloy coatings

2018 ◽  
Vol 24 (3) ◽  
pp. 241 ◽  
Author(s):  
Malika Diafi ◽  
Tahraoui Louiza ◽  
Kelthoum Digheche ◽  
Farida Khamouli
Keyword(s):  
Alloy Composition ◽  
Electrochemical Impedance ◽  
Co2 Concentration ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Cobalt Alloy ◽  
Corrosion Properties ◽  
X Ray ◽  
Continuous Current ◽  
Nyquist Plots

<p>The effects the concentration of cobalt on zinc-cobalt alloys obtained from sulphate baths under continuous current deposition are described. The deposit morphology was analyzed using Scanning Electron Microscopy (SEM) and an X-Ray Diffraction (XRD) was used to determine the preferred crystallographic orientations of the deposits. Protection against corrosion properties studied in a solution of 3 % NaCl in the potentiodynamic polarization measurements (Tafel), electrochemical impedance spectroscopy (EIS) to the potential of corrosion free. The parameters that characterize the corrosion behavior can be determined from the plots and Nyquist plots. It has been observed that the Zn–Co alloy is characterized by enhanced the resistance of corrosion compared to the Zn alloys. and the addition of Co in the Zn-Co increases the micro-hardness, XRD and SEM results an identify any coatings Zn-Co alloy composition reveals that. zinc-rich( η- phase) , cubic Co<sub>5</sub>Zn<sub>21 </sub>.</p>

scholarly journals STUDY OF ZN-NI ALLOY COATINGSMODIFIED BY NANO-AL2O3 PARTICLES INCORPORATION

2016 ◽  
Vol 22 (3) ◽  
pp. 171 ◽  
Author(s):  
Malika Diafi ◽  
Said Benramache ◽  
Elhachmi Guettaf Temam ◽  
Adaika Mohamed Lakhdar ◽  
Brahim Gasmi
Keyword(s):  
Electrochemical Impedance ◽  
Research Work ◽  
Charge Transfer Resistance ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
Transfer Resistance ◽  
Characterization Methods ◽  
Ni Alloy ◽  
Steel Substrates

<p class="AMSmaintitle">Abstract</p><p class="Default">The aim of this research work was to codeposit nano-Al<sub>2</sub>O<sub>3</sub> particles into Zn-Ni alloy coatings in order to improve some surface ,properties, the influence of the concentration of Al2O3 is the principal object in order to improve the corrosion resistance of the deposit, which has been made by electroplating on steel substrates previously treated, have been studied by several characterization methods, as the X-ray diffraction, measurement of micro hardness and scanning electron microscopy (SEM), protection against corrosion properties studied in a solution of 3% NaCl in the potentiodynamic polarization measurements (Tafel), electrochemical impedance spectroscopy (EIS) to the potential of corrosion free. The parameters that characterize the corrosion behavior can be determined from the plots and Nyquist plots and chronopotentiometry. Trends of increasing the charge transfer resistance and the decrease of capacitance values. XRD and SEM results and identify any coatings Zn-Ni and Zn-Ni-Al<sub>2</sub>O<sub>3</sub> alloy composition have similar phase ( γ-phase structure) and the addition of Al<sub>2</sub>O<sub>3</sub> in the Zn-Ni matrix increases the microhardness, and we note the maximum hardness is obtained for 50 g/L Al<sub>2</sub>O<sub>3</sub>.</p><p class="Default"> </p>

THE EFFECT OF PLASMA OXIDATION AND NITRIDATION ON CORROSION BEHAVIOR OF CoCrMo ALLOY IN SBF SOLUTION

2018 ◽  
Vol 25 (08) ◽  
pp. 1950024
Author(s):  
M. ASLAN ◽  
O. ÇOMAKLI ◽  
M. YAZICI ◽  
A. F. YETIM ◽  
Ö. BAYRAK ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Plasma Nitriding ◽  
Simulated Body Fluid Solution ◽  
Process Temperature ◽  
Plasma Oxidation ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
Sbf Solution

The present study was focussed on investigating the corrosion properties of plasma-oxidized and -nitrided CoCrMo alloys under different conditions. The structural properties of untreated and treated samples were examined by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Corrosion behavior of samples was mainly investigated by potentiodynamic polarization and electrochemical impedance spectroscopy in simulated body fluid solution. The results showed that corrosion resistance of the oxidized layers was better than that of the nitrided ones. The corrosion resistance of the alloys increased as the plasma oxidation process temperature and time increased. However, the corrosion resistance of the alloys reduced with increase in the process temperature and time after plasma nitriding process.

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