Nano Hydroxyapatite as a Corrosion Resistant Coating of AZ31 Magnesium Alloys

2013 ◽  
Vol 829 ◽  
pp. 376-380 ◽  
Author(s):  
Mohsen Saremi ◽  
Shiva Mohajernia ◽  
Sina Hejazi
Keyword(s):  
X Ray Diffraction ◽  
Electrodeposition Technique ◽  
Micro Structure ◽  
Corrosion Resistant ◽  
X Ray ◽  
Surface Corrosion ◽  
Tafel Polarization ◽  
Corrosion Behaviors ◽  
Bio Compatibility ◽  
Corrosion Resistant Coating

nanohydroxyapatite (n-HAP) was coated on to AZ31 magnesium alloy in order to reduce the surface corrosion rate and enhance the bio-compatibility. N-HAP was successfully coated by pulse electrodeposition technique. Morphology and composition of the coatings were investigated by scanning electron microscopy and X-ray diffraction methods, respectively. The corrosion behaviors of the coatings were studied by tafel polarization and impedance spectroscopy tests. Results demonstrated that the porosity of the nanostructure coating decrease in comparison with micro structure coating and therefore, corrosion resistance of AZ31 was improved significantly. Also, the adhesion of nanostructure coating was increased and thus it can be introduced as a suitable coating for body implants.

scholarly journals Roughness Effect on Corrosion of Gr-Cu -Ni Coated Steel in Saline Water

2021 ◽  
Vol 23 (12) ◽  
pp. 89-101
Author(s):  
A.A. Atia ◽  
◽  
M.M. Sadawy ◽  
A. A. Kandil ◽  
A. A. Atlam ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Saline Water ◽  
Open Circuit ◽  
Surface Finishing ◽  
X Ray Diffraction ◽  
Roughness Effect ◽  
X Ray ◽  
Tafel Polarization ◽  
Corrosion Behaviors ◽  
Effect Of Surface

Effect of surface roughness on corrosion behavior for carbon steel was coated by metallic layers Cu- Ni Reinforced with Gr layers. Surface finishing P320, P600 and P1200 mesh used until a mirror shiny surface before metallic coated with Gr layers at consecrations 0.25, 0.5, 1and 2 g/l of Gr. First, X-ray diffraction), electron microscopy associated for carbon steel & Gr and Microscopic test for coated specimens. The techniques were performed to study the effect of saline water (3.5%) on the corrosion behaviors, Open circuit potential, Tafel polarization and impedance spectroscopy tests. At P320 Equivalent Circuit elements were decreasing but, Corrosion reaction’s Rp was increased at 5 min and 0.25 g/l. And also, coating’s Rpore with Electrolyte’s Ru were increasing at 30 min for 0.5 g/l, and also coating’s Rpore and Electrolyte’s Ru were increased at 20 min for 1 g/l, At P600 ECE’s were decreasing but, corrosion reaction’s Rp was increased at 30 min 1 g/l, and also, coating’s Rpore and Electrolyte’s Ru were increased at 20 min for 1 g/l, and At P1200 ECE’s were decreasing but, Coating’s Ccoat was increased at 5 min 0.25 g/l, and also coating’s Rpore and Electrolyte’s Ru were increased at 0.5g/l, 30 min.

Corrosion Behavior of Titanium Alloy and Titanium in Different Solution

2014 ◽  
Vol 599-601 ◽  
pp. 169-178
Author(s):  
Shu Fen Zhao ◽  
Hong Guang Jia ◽  
Jin Hui Wang
Keyword(s):  
Titanium Alloy ◽  
Pure Titanium ◽  
Sem Analysis ◽  
Corrosion Performance ◽  
X Ray Diffraction ◽  
Ionic Solution ◽  
X Ray ◽  
Surface Corrosion ◽  
Determine Role ◽  
Corrosion Behaviors

Anti-corrosion performance of titanium alloy/pure titanium was studied from the aspect of electrochemistry. Anode polarization test and electrochemistry impedance spectroscopy were applied to investigate the influence of different ionic solution on corrosion behaviors of titanium alloy and pure titanium. From the X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis on the titanium samples after surface corrosion or not, we found that the corrosion performance of pure titanium was more sensitive to ionic solution than that of titanium alloy, and oxidant ions played a determine role in the corrosion process of pure titanium.

Electrodeposition of Sn-Ni Alloy Coatings and their Characterization

2015 ◽  
Vol 830-831 ◽  
pp. 655-658 ◽  
Author(s):  
Sandhya Shetty ◽  
Ampar Chitharanjan Hegde
Keyword(s):  
Sem Analysis ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
Corrosion Resistant ◽  
X Ray ◽  
Ni Alloy ◽  
Corrosion Behaviors ◽  
Current Densities ◽  
Alkaline Bath ◽  
Scanning Electron

A new alkaline bath has been proposed for deposition of bright Sn-Ni alloy coatings on mild steel (MS). Depositions were carried out at different current densities (c.d.) and their corrosion behaviors were studied in 5 % NaCl solution by electrochemical AC and DC methods. Sn-Ni coating, deposited at low c.d. i.e. at 1.0 A/dm2 was found to be the most corrosion resistant compared to those at other higher c.d., even up to 4.0 A/dm2. This least corrosion rate (CR) is attributed to high wt. % Sn in the deposit. Increase of CR at high c.d. range is due to decrease of wt. % Sn, explained by the observed anomalous type of codeposition, followed by the bath. Regardless of the deposition c.d., the bath developed bright coatings, inherent of Sn-Ni alloy. Experimental results are discussed taking in account of the phase structure, composition and surface morphology of the coatings, evidenced by X-ray diffraction (XRD), Energy Dispersive X-ray (EDX) and Scanning Electron Microscopy (SEM) analysis.

Effect of Pressure Carbonization in Carbon/Carbon Composite Process (II)

1991 ◽  
Vol 251 ◽  
Author(s):  
H. Okamoto ◽  
T. Hosomura ◽  
K. Kosaka
Keyword(s):  
Iron Powder ◽  
Phenolic Resin ◽  
Carbon Composite ◽  
X Ray Diffraction ◽  
Micro Structure ◽  
Carbon Yield ◽  
X Ray ◽  
Effect Of Pressure ◽  
Heat Treated ◽  
Powder Addition

ABSTRACTWe have found that pressurized carbonization cause the increase of carbon yield and the improvement of micro structure In the case of pitch resin. While the effects of pressurized carbonization on phenolic resin are not obvious.In this study, carbonization and graphitization characteristics of phenolic resin were investigated experimentally. Phenolic resin specimens with and without iron powder addition were carbonized at the temperature of 650 °C under the pressure of atmospheric or 100MPa. Then each of them was heat-treated at the temperature of 1200, 1500 and 1900 °C respectively. Measurement of yield, density, x-ray diffraction and optical observation were carried out in the experiments. It is indicated from those results that pressurized carbonization of phenolic resin makes graphite crystallization progress and this effect is promoted by addition of iron powder.

scholarly journals Effect of Graphene Oxide Concentration in Electrolyte on Corrosion Behavior of Electrodeposited Zn–Electrochemical Reduction Graphene Composite Coatings

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 758 ◽  
Author(s):  
Yang ◽  
Zhang ◽  
Wang ◽  
Wang ◽  
Chen ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Laser Raman Spectroscopy ◽  
304 Stainless Steel ◽  
Sulfate Electrolyte ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tafel Polarization ◽  
Laser Raman

Pure Zn and Zn–ERGO composite coatings were prepared by direct current electrodeposition on 304 stainless steel. Samples were characterized by X-ray diffraction (XRD), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDS), and laser Raman spectroscopy (Raman). Results obtained have shown that the concentration of GO sheets in zinc sulfate electrolyte has an important effect on the preferred crystal orientation and the surface morphology of Zn–ERGO composite coatings. A study of the corrosion behavior of the coatings by Tafel polarization and electrochemical impedance spectroscopic (EIS) methods leads to the conclusion that the Zn-1.0 g/L ERGO composite coating possesses the best corrosion resistance compared to the pure Zn coating and other composite coatings in this study.

Features of Laser Treatment of Corrosion-Resistant Steels of Austenitic and Carbide Classes

2020 ◽  
Vol 989 ◽  
pp. 296-300
Author(s):  
Tatiana Vasilievna Tarasova ◽  
I.S. Belashova ◽  
S.D. Kuzmin ◽  
S.A. Egorov
Keyword(s):  
Heat Treatment ◽  
Fiber Laser ◽  
Laser Treatment ◽  
High Efficiency ◽  
Laser Heat Treatment ◽  
Laser Shock ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
Corrosion Resistant ◽  
X Ray

In this paper effect of a fiber laser on the microstructure and properties of steels 95X18 and 12X18H10T is shown. The regularities of changes in the structure of a laser-treated surface by X-ray diffraction and X-ray microscopic analyzes were studied. The high efficiency of laser heat treatment of steel 95X18 with the subsequent tempering, to improve the tribological properties of the surface layers has been established. For steel 12X18H10T laser shock hardening method (405 HV) is recognized to be effective.

scholarly journals Role of Vanadium Additions on the Corrosion Mitigation of Ti-6Al-xV Alloy in Simulated Body Fluid

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 903 ◽  
Author(s):  
El-Sayed M. Sherif ◽  
Sameh A. Ragab ◽  
Hany S. Abdo
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Immersion Time ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cyclic Potentiodynamic Polarization ◽  
Elemental Analyses ◽  
Corrosion Behaviors

The manufacturing of different Ti-6Al-xV (x = 2, 4, 6, and 8 wt.%) alloys using a mechanical alloying technique was reported. The corrosion behaviors of these newly fabricated alloys after 1, 24, and 48 h exposure to a simulated body fluid (SBF) were assessed using cyclic potentiodynamic polarization, electrochemical impedance spectroscopy, and chronoamperometric measurements. Surface morphology and elemental analyses after corrosion for 48 h in SBF were reported using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) examinations. An X-ray diffraction investigation characterized the phase analyses. All results indicated that the increase of V content significantly decreases both uniform and pitting corrosion. This effect also increases with prolonging the immersion time to 48 h before measurement.

Influence of Thermal Treatment on the Electrochemical Properties of Ni+W+Mo+Si Composite Coatings in an Alkaline Solution

2015 ◽  
Vol 228 ◽  
pp. 305-309
Author(s):  
Magdalena Popczyk ◽  
Bożena Łosiewicz ◽  
Eugeniusz Łągiewka ◽  
A. Budniok
Keyword(s):  
Thermal Treatment ◽  
Composite Coatings ◽  
Electrochemical Corrosion ◽  
Argon Atmosphere ◽  
X Ray Diffraction ◽  
Corrosion Resistant ◽  
X Ray ◽  
Electrochemical Corrosion Resistance ◽  
Galvanostatic Conditions ◽  
Xrd Method

The Ni+W+Mo+Si composite coatings were prepared by electrodeposition under the galvanostatic conditions (jdep= -100 mA cm-2) from the nickel bath containing powders of tungsten, molybdenum and silicon. Thermal treatment of the obtained coatings was conducted in argon atmosphere. Chemical composition of the coatings was determined by energy dispersive spectrocopy (EDS). Phase composition investigations were conducted by X-ray diffraction (XRD) method. Studies of electrochemical corrosion resistance were carried out in 5 M KOH solution. On the basis of these investigations it was found that Ni+W+Mo+Si thermally treated coating is more corrosion resistant than Ni+W+Mo+Si as-deposited coating.

scholarly journals Preparation of BaZrO3 powders by a spray-drying process

2003 ◽  
Vol 18 (6) ◽  
pp. 1325-1332 ◽  
Author(s):  
B. Robertz ◽  
F. Boschini ◽  
A. Rulmont ◽  
R. Cloots ◽  
I. Vandriessche ◽  
...  
Keyword(s):  
Spray Drying ◽  
Precursor Solution ◽  
Barium Zirconate ◽  
Drying Process ◽  
X Ray Diffraction ◽  
High Quality ◽  
Corrosion Resistant ◽  
X Ray ◽  
Potential Use ◽  
Scanning Electron

The potential use of barium zirconate for the manufacture of corrosion-resistant substrates emphasizes the need for a simple, inexpensive, and easily scalable process to produce high-quality powders with well-controlled composition and properties. However, the classical solid-state preparation of barium zirconate leads to an inhomogeneous powder unsuitable for applications in highly corrosive environment. For this paper, the possibility to use the spray-drying technique for the preparation of BaZrO3 powders with a controlled size distribution and morphology was investigated. The influence of the nature and concentration of the precursor solution and the influence of the spray-drying step are discussed on the basis of x-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and dilatometric measurements.

Growth of Copper Telluride Thin Films using Electrodeposition

2018 ◽  
Vol 21 (1) ◽  
pp. 015-019
Author(s):  
P. Jeyakumar ◽  
S. Thanikaikarasan ◽  
B. Natarajan ◽  
T. Mahalingam ◽  
Luis Ixtlilco
Keyword(s):  
Thin Films ◽  
X Ray Diffraction ◽  
Electrodeposition Technique ◽  
Cyclic Voltammetric ◽  
Voltammetric Analysis ◽  
Copper Telluride ◽  
X Ray ◽  
Microstructural Parameters ◽  
Glass Substrates ◽  
Deposited Films

Copper Telluride thin films have been prepared on Fluorine doped Tin Oxide coated conducting glass substrates using electrodeposition technique. Cyclic voltammetric analysis has been carried out to analyze the growth mechanism of the deposited films. Thickness value of the deposited films has been estimated using Stylus profilometry. X-ray diffraction pattern revealed that the prepared films possess polycrystalline in nature. Microstructural parameters such as crystallite size, strain and dislocation density are evaluated using observed X-ray diffraction data. Optical absorption analysis showed that the prepared films are found to exhibit band gap value around 2.03 eV.

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