scholarly journals Effect of Temperature on the Corrosion Behavior of Biodegradable AZ31B Magnesium Alloy in Ringer’s Physiological Solution

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 591 ◽  
Author(s):  
Sebastian Feliu ◽  
Lucien Veleva ◽  
Federico García-Galvan
Keyword(s):  
Corrosion Rate ◽  
Electrochemical Impedance ◽  
Physiological Solution ◽  
Corrosion Layer ◽  
Effect Of Temperature ◽  
X Ray ◽  
Ringer’S Solution ◽  
Corrosion Behaviors ◽  
Az31b Alloy ◽  
Increasing Temperature

In this work, the corrosion behaviors of the AZ31B alloy in Ringer’s solution at 20 °C and 37 °C were compared over four days to better understand the influence of temperature and immersion time on corrosion rate. The corrosion products on the surfaces of the AZ31B alloys were examined by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Electrochemical impedance spectroscopy (EIS) provided information about the protective properties of the corrosion layers. A significant acceleration in corrosion rate with increasing temperature was measured using mass loss and evolved hydrogen methods. This temperature effect was directly related to the changes in chemical composition and thickness of the Al-rich corrosion layer formed on the surface of the AZ31B alloy. At 20 °C, the presence of a thick (micrometer scale) Al-rich corrosion layer on the surface reduced the corrosion rate in Ringer’s solution over time. At 37 °C, the incorporation of additional Mg and Al compounds containing Cl into the Al-rich corrosion layer was observed in the early stages of exposure to Ringer’s solution. At 37 °C, a significant decrease in the thickness of this corrosion layer was noted after four days.

Effect of Temperature on H2S/CO2 Corrosion Behaviors of P110-3Cr Steel

2013 ◽  
Vol 816-817 ◽  
pp. 54-59 ◽  
Author(s):  
Xin Su ◽  
Jian Bo Sun ◽  
Chong Sun ◽  
Bin Han
Keyword(s):  
Corrosion Rate ◽  
Corrosion Product ◽  
Iron Sulfide ◽  
Energy Dispersive Spectrometer ◽  
Corrosion Products ◽  
Effect Of Temperature ◽  
General Corrosion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Corrosion Behaviors

Flowing solution environment containing H2S/CO2was simulated by high temperature and high pressure autoclave. Corrosion behaviors of P110-3Cr pipeline steels were investigated by Weight loss, Scanning electron microscopy (SEM), X-Ray diffraction (XRD) and Energy dispersive spectrometer (EDS). Effect of temperature on corrosion rate and corrosion product was discussed. The results showed that corrosion rate of P110-3Cr steel decrease at the beginning and then increased with rising temperature. The corrosion types are general corrosion. P110-3Cr has resistance to local corrosion. Mackinawite (FeS0.9) is formed as corrosion product in low-temperature condition. With temperature increasing the corrosion products are dominated by mackinawite (FeS0.9) and Cubic iron sulfide (Fe3S4). When temperature increased to 150 ¡æ, the corrosion products are made up of Hexagonal iron sulfide (Fe0.96S) and Orthorhombic Marcasite (FeS2). No siderite (FeCO3) is detected, the corrosion is controlled by H2S; Cr is rich in the corrosion scale.

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.

Corrosion Behavior of Hot-Dip Galvanized Reinforcing Steel Using Electrochemical Impedance Spectroscopy

2011 ◽  
Vol 250-253 ◽  
pp. 222-227 ◽  
Author(s):  
Bi Lan Lin ◽  
Yu Ye Xu
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Rate ◽  
Electrochemical Impedance ◽  
Chloride Ions ◽  
Reinforcing Steel ◽  
Effective Measure ◽  
Passivation Film ◽  
Corrosion Behaviors

Galvanizing on the surface of reinforcing steel is an effective measure to control corrosion of reinforcing concrete structures. The corrosion behaviors of hot-dip galvanized (HDG) reinforcing steel in simulated concrete pore solution (SCP solution) with various pH and chlodride values were investigated using electrochemical impedance spectroscopy (EIS). Two equivalent circuit models corresponding to the corrosion process were proposed and the evolution feature of the corrosion parameters were analyzed. The results show that when the SCP solution was carbonated seriously (pH<11), there is hydrogen evolution phenomenon and the corrosion resistance of HDG reinforcing steel is decreased. A minute carbonation of SCP solution (11.5≤pH<12.5) favors the further passivation of the zinc layer and the corrosion resistance is enhanced. The corrosion rate of HDG reinforcing steel at pH=12.0 is minimal, around 0.59 μm/year, whereas that at pH=12.5 is approximate 1.21 μm/year. In the conditions of pH=12.5 and NaCl concentration no more than 0.5wt.%, the corrosion resistance of the passivation film on HDG reinforcing steel is good. In a serious carbonation case, the corrosion rate is increased greatly with chloride ions.

scholarly journals Green Corrosion Inhibitors for Copper in HCl and H2SO4 Solution - A Review

2021 ◽  
Vol 9 (VI) ◽  
pp. 353-361
Author(s):  
R. T. Vashi
Keyword(s):  
Weight Loss ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Energy Dispersive ◽  
Effect Of Temperature ◽  
Metallic Surface ◽  
Electrochemical Impedance Spectra ◽  
X Ray ◽  
Surface Corrosion ◽  
Chemical Attack

Corrosion is the deterioration of metal by chemical attack or reaction with its environment. It is a constant and continuous problem, often difficult to eliminate completely. Prevention would be more practical and achievable than complete elimination. Recently, a huge interested for the use of naturally occurring inhibitors extracted from plants have been emerged. Most of the natural products are non-toxic, biodegradable and readily available due to environmental concerns. The inhibitor is chemically adsorbed on the surface of the metal and forms a protective thin film with inhibitor effect or by combination between inhibitor ions and metallic surface. Corrosion of copper and its inhibition was analyzed by weight loss (Gravimetric), effect of temperature and time of immersion methods. Electrochemical methods such as, Potentiodynamic polarization and Electrochemical Impedance Spectra (EIS) were employed. The protective films formed on metal surface have been analyzed by various techniques such as Scanning Electron Microscope (SEM), Energy dispersive X-ray spectrometry (EDS) and. Atomic Force Microscopy (AFM), Fourier transform infrared spectroscopy (FT-IR), UV-Visible spectra, X-ray Diffraction spectroscopy (XRD), Energy Dispersive X-ray Spectroscopy (EDX), electrochemical frequency modulation (EFM) techniques. The results obtained from weight loss and electrochemical techniques were in good agreement. In this review paper, research works produced over the past background on the corrosion of copper in various medium and their corrosion inhibition by using a various green inhibitors were presented.

Effect of temperature and pressure on mechanical, surface and electrochemical properties of Al-1.5Cu-5.5Zn-2.5Mg (Alumix-431)

2018 ◽  
Vol 65 (6) ◽  
pp. 558-571 ◽  
Author(s):  
Ayşe Nur Acar ◽  
Rasiha Nefise Mutlu ◽  
Abdul Kadir Ekşi ◽  
Ahmet Ekicibil ◽  
Birgül Yazıcı
Keyword(s):  
Electrochemical Properties ◽  
Surface Characterization ◽  
Electrochemical Impedance ◽  
Effect Of Temperature ◽  
Corrosion Properties ◽  
Content Type ◽  
X Ray ◽  
Good Surface ◽  
Mechanical Properties And Corrosion ◽  
Mechanical Surface

Purpose The purpose of this paper is to examine new alloys created from Alumix 431 powder and investigate their mechanical and electrochemical properties. Design/methodology/approach In this study; Alumix-431 alloy samples were prepared using the powder metallurgy (P/M) method applying cold (RT) and warm (50°C and 80°C) compaction methods under pressures of 200 and 250 MPa and were sintered at 600°C in N2(g) atmosphere. Hardness and density of the samples were measured, and corrosion properties were determined by electrochemical impedance spectroscopy charting polarization curves. Surface characterization was determined by contact angle, scanning electron microscopy/mapping, energy dispersive X-ray spectrometry and X-ray diffractometry images. Findings Alumix-431 alloys obtained upon compaction at 250 MPa/50 °C had the highest mechanical properties and corrosion resistance and good surface properties. On the surfaces of Alumix-431 alloys, α-Al, MgZn2, Al2,CuMg, Al2,O3, Al2MgO4 phases were recorded. Originality/value This study aimed to construct a correlation between mechanical and electrochemical properties of the newly created alloys (prepared under special conditions).

scholarly journals EFFECT OF TEMPERATURE AND CONCENTRATION OF NaOH SOLUTIONS AS INHIBITORS ON IRON CORROSION RATE IN WATER MEDIA

Konversi ◽  
2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Muthia Elma ◽  
Nurhalisah Nurhalisah ◽  
Afrisa Noor Hidayanti
Keyword(s):  
Corrosion Rate ◽  
Corrosion Inhibitors ◽  
Protective Layer ◽  
Effect Of Temperature ◽  
Iron Corrosion ◽  
Before And After ◽  
Water Media ◽  
Naoh Solution ◽  
Increasing Temperature ◽  
Area And Volume

Corrosion is a chemical phenomenon that often occurs in iron materials that are exposed or immersed in a medium either liquid or air. As a result of this corrosion is fragility and damage to the object so that the object cannot function properly. The purpose of this research is to prevent or slow down the occurrence of corrosion by adding chemicals called corrosion inhibitors which work by forming a protective layer on the surface of objects in the form of metal or iron.In this study, inhibitors were used in the form of NaOH solution with variations in the concentration of 0.1; 0.5; 1; 1.25; 1,5; 5 and 10 N are dissolved in water media and the iron immersion process is carried out at temperatures of 40, 45, and 50 °C. Soaked iron bars are measured for surface area and volume as well as weighing before and after the immersion process so that the corrosion rate is obtained with various variables used. Based on the research results obtained corrosion rate increases with increasing temperature and the addition of NaOH concentration inhibitors. Optimal temperature and concentration to inhibit the rate of iron corrosion is at an immersion temperature of 45 ° C and a concentration of 0.1 N NaOH with a corrosion rate of 0.084875 mpy.

Electro chemical impedance spectroscopy (EIS) study of modified SS316L using radio frequency sputtering Ti6Al4V coating in Ringer solution

2019 ◽  
Vol 66 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Murtdha Adhab Siyah ◽  
Rostam Moradian ◽  
Iraj Manouchehri
Keyword(s):  
Human Body ◽  
Electrochemical Impedance ◽  
Biomedical Application ◽  
Rf Sputtering ◽  
Ringer Solution ◽  
Impedance Spectra ◽  
Content Type ◽  
Ringer’S Solution ◽  
Sputtering Power ◽  
Corrosion Behaviors

PurposeSS316L alloy used in biomedical application and the alloy have Fe, Cr and Ni elements and release this ion into the human body causing dangerous effects for the human body, and make the SS316L, which is used as surgical implant failure in short time in biomedical application. This study aims to use Ti6Al4V as coating for SS316L alloy to make it have bio inert surface, and modified the surface alloy for biomedical application from another part in this study, we want to decrease the corrosion rate for SS316L in simulated body surface Ringer solution.Design/methodology/approachThe morphology, roughness, XRD of the coating, potential polarization and electrochemical impedance spectra investigation to study the effect of Ti6Al4V coating on corrosion behaviors of SS316L in the Ringer solution.FindingsThis study discusses the modification of SS316L surfaces by using Ti6Al4V radio magnetron frequency sputtering techniques, the results of the EIS and polarization of SS316L in Ringer’s solution at 37°C shows that improved resistance against corrosive ions for all the samples coating with Ti6Al4V and especially with a coating have a thickness of 850 nm at a sputtering power of 150 W.Research limitations/implicationsPolarization and electro chemical impedance spectra were assessed to investigate the effect of Ti6Al4V coating on corrosion behaviors of SS316L alloy in the Ringer solution.Practical implicationsThis study discussed the modification SS316L surfaces by using Ti6Al4V radio magnetron frequency sputtering techniques. The results of the EIS and polarization of SS316L in Ringer’s solution at 37°C improved resistance against corrosive ions for all the samples coating with a Ti6Al4V and specificity with the coating sample have a thickness 850 nm at a sputtering power of 150 W.Social implicationsThe goal of this study to modification SS316L alloy surface by using Ti6al4V RF Sputtering to give the SS316L alloy more resistance for biocorrosion.Originality/valueIn this research, Ti6Al4V RF sputtering as a coating for SS316L, study the bio corrosion behaviors in Simulated body fluid Ringer solution and investigation the corrosion by using EIS analysis.

Electrochemical Investigation of Under-Deposit Corrosion Behavior for Aluminum Brass in Artificial Seawater

CORROSION ◽  
10.5006/3428 ◽  
2020 ◽  
Vol 76 (11) ◽  
pp. 1050-1063
Author(s):  
Hong Ju ◽  
Weihui Xu ◽  
Jiejing Chen ◽  
Dalei Zhang ◽  
Guomin Liu ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Electrolytic Cell ◽  
Artificial Seawater ◽  
Localized Corrosion ◽  
Effect Of Temperature ◽  
Multielectrode Arrays ◽  
Energy Dispersive Spectrometry Analysis ◽  
Spectrometry Analysis

The under-deposit corrosion behavior and mechanism of aluminum brass (HAl77-2) were investigated in artificial seawater with a custom double electrolytic cell. The experiments included linear polarization, electrochemical impedance spectroscopy, and multielectrode arrays analysis. The electrochemical results revealed a pronounced effect of temperature on the under-deposit corrosion behavior of HAl77-2. The corrosion of HAl77-2 inside the CaCO3 scale is aggravated with increasing temperature. However, the increasing frequency of the corrosion rate of HAl77-2 gradually decreased after 333 K. Moreover, in the desalination of artificial seawater, the corrosion rate of HAl77-2 in the occulated area initially increased and subsequently decreased with increasing Cl− concentration. The scanning electron microscopy and energy dispersive spectrometry analysis showed a remarkable appearance of selective localized corrosion on the surface of HAl77-2.

Sintering of Commercial Leucite-Based Dental Porcelains

2008 ◽  
Vol 591-593 ◽  
pp. 692-696
Author(s):  
Cátia Fredericci ◽  
H.N. Yoshimura ◽  
André Luiz Molisani ◽  
C.E. Bellinati ◽  
R.Q.E. Alcântara ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Heating Rate ◽  
Effect Of Temperature ◽  
Surface Microstructure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Increasing Temperature ◽  
Fractured Surface ◽  
Scanning Electron

The aim of this work was to study the effect of temperature and heating rate on the densification of two leucite-based dental porcelains: one low-fusion and one high-fusion commercial leucite porcelains (Dentsply-Ceramco). Porcelain powders were characterized by differential thermal analysis (DTA), X-ray diffraction (XRD), particle size distribution, and helium picnometry. Bar samples were sintered from 650 to 1050oC, using heating rate of 55oC and 10oC/min. Sintered samples were characterized in terms of bulk density, measured by the Archimedes method in water, and fractured surface microstructure by scanning electron microscopy (SEM). The results show that densification increases with increasing temperature and the increase in heating rate has no effect on the densification of the porcelains studied.

Pitting corrosion and crevice corrosion behaviors of titanium alloy overlapped with aluminized PVC film in neutral salt spray

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Longfei Xie ◽  
Wenlong Zhou ◽  
Shiwen Zou ◽  
Xuesong Fu
Keyword(s):  
Crevice Corrosion ◽  
Graphical Model ◽  
Electrochemical Impedance ◽  
Galvanic Corrosion ◽  
Salt Spray ◽  
Corrosion Mechanism ◽  
Neutral Salt ◽  
X Ray ◽  
Pvc Film ◽  
Corrosion Behaviors

Abstract This paper presents a research on the corrosion behavior of Ti-15-3 alloy overlapped with aluminized PVC film in salt spray. It was found that severe corrosion occurred on aluminized PVC film in the coupled regions because of crevice corrosion and/or galvanic corrosion whereas Ti-15-3 alloy in the coupled regions experienced minor corrosion. Scanning electron microscope and Energy-dispersive X-ray spectroscopy analyses demonstrated the corrosion products adhered to the surface of Ti-15-3 alloy within the crevice. To evaluate the effect of aluminized PVC film on the crevice corrosion of Ti-15-3 alloy in salt spray condition, it is necessary to compare with the corrosion resistance of Ti-15-3 overlapped with polytetrafluoroethylene (PTFE) in different neutral salt spray. Further, the tests were performed by electrochemical impedance spectroscopy and potentiodynamic polarization. Combining the graphical model, an in-depth understanding of the crevice and galvanic corrosion mechanism of Ti-15-3 alloy overlapped with aluminized PVC film has been revealed.

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