scholarly journals Effect of Iron Content on Corrosion Properties of Pure Titanium as Grain Refiner

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7193
Author(s):  
Bosung Seo ◽  
Hyeon-Tae Im ◽  
Ki-Beom Park ◽  
Kwangsuk Park ◽  
Hyung-Ki Park
Keyword(s):  
Corrosion Resistance ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Pure Titanium ◽  
Open Circuit ◽  
Tio2 Layer ◽  
Grain Refiner ◽  
Corrosion Properties ◽  
Acid Environment ◽  
Titanium Cathode

Microstructures and corrosion properties of pure titanium were characterized when iron was used as a grain refiner. The added Fe element acted as a strong grain refiner for pure titanium by forming β Ti phase at grain boundaries, and 0.15 wt% Fe was revealed to be a sufficient amount to make the grain size of pure titanium below 20 μm, which was the requirement for the desired titanium cathode. However, corrosion resistance was decreased with the Fe amount added. From the open circuit potential (OCP) results, it was obvious that the TiO2 stability against the reducing acid environment was deteriorated with the Fe amount, which seemed to be the main reason for the decreased corrosion resistance. Electrochemical impedance spectroscopy (EIS) results showed that both the decrease in the compact oxide film’s resistance (Rb) and the appearance of the outer porous film occurred as a result of the dissolution of the TiO2 layer, whose phenomena became more apparent as more Fe was added.

scholarly journals Long-Term Assessment of the In Vitro Corrosion Resistance of Biomimetic ACP Coatings Electrodeposited from an Acetate Bath

2021 ◽  
Vol 12 (1) ◽  
pp. 12
Author(s):  
Patrycja Osak ◽  
Joanna Maszybrocka ◽  
Julian Kubisztal ◽  
Patryk Ratajczak ◽  
Bożena Łosiewicz
Keyword(s):  
Corrosion Resistance ◽  
Calcium Phosphate ◽  
Surface Characterization ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Artificial Saliva ◽  
Pure Titanium ◽  
Open Circuit

Calcium phosphate coatings are able to improve the osseointegration process due to their chemical composition, which is similar to that of bone tissues. In this work, to increase the long-term corrosion resistance and to improve the osseointegration process of commercially pure titanium Grade 4 (CpTi G4), biomimetic amorphous calcium phosphate (ACP) coatings were electrodeposited for the first time from an acetate bath with a pH level of 7.0 and a Ca:P ratio of 1.67. ACP coatings were obtained on CpTi G4 substrate subjected to sandblasting and autoclaving using electrochemically assisted deposition at a potential of −3 V relative to the open circuit potential for 30 min at room temperature. SEM, EDS, 2D roughness profiles, amplitude-sensitive eddy current method, and Kelvin scanning probe were used for the surface characterization of the biomaterial under study. In vitro corrosion resistance tests were conducted for 21 days in artificial saliva using open circuit potential, polarization curves, and electrochemical impedance spectroscopy measurements. The passive-transpassive behavior was revealed for the obtained ACP coatings. The long-term corrosion resistance test showed a deterioration of the protective properties for CpTi G4 uncoated and coated with ACP with immersion time. The mechanism and kinetics of the pitting corrosion on the CpTi G4|TiO2|ACP coating system are discussed in detail.

Corrosion Behavior of Surfaced AM50 Magnesium Alloys under Stress Conditions

2010 ◽  
Vol 95 ◽  
pp. 79-83
Author(s):  
Amir Eliezer
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Spinel Phase ◽  
Ceramic Coatings ◽  
Open Circuit ◽  
Stress Conditions ◽  
X Ray Diffraction ◽  
X Ray

Micro-arc oxidization of AM50 magnesium alloys was studied. The influence of micro-arc oxidization process was investigated; phase structure were analyzed using X-ray diffraction (XRD). Open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion resistance of ceramic coatings formed on magnesium alloys under stress conditions. XRD analyses indicate that the ceramic coatings fabricated on the surface of magnesium alloys by micro-arc oxidization are composed of spinel phase MgAl2O4 The corrosion resistance of ceramic coatings is improved compared with magnesium alloy substrate.

Electrochemical Determination of the Corrosion Resistance of Ag-Pd Dental Alloys

2008 ◽  
Vol 59 (9) ◽  
Author(s):  
Daniel Mareci ◽  
Igor Cretescu ◽  
Neculai Aelenei ◽  
Julia Claudia Mirza Rosca
Keyword(s):  
Corrosion Resistance ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Artificial Saliva ◽  
Surface Film ◽  
Electrochemical Determination ◽  
Open Circuit ◽  
Electrochemical Characteristics

The electrochemical behavior of a three Ag-Pd alloys used in dental prosthetics construction for crowns and bridges was studied in artificial saliva using the polarization curves and electrochemical impedance spectroscopy (EIS). The corrosion resistance was evaluated by means of the corrosion currents value and by coulometric analysis. The open circuit potential of Ag-Pd are attributed to dealloying followed by surface enrichment with Ag and the possible formation of an insoluble AgCl surface film on the respective alloy surfaces. Our results have shown that these alloys have a somewhat good corrosion resistance in artificial saliva. When increasing the content of Cu, corrosion resistance decreases. The passivation of all samples occurred spontaneously at the open circuit potential. The electrochemical properties of the spontaneously passivated electrodes at the open circuit potential were studied by EIS. The polarization resistance (Rp) and the electrode capacitance (Cdl) were determined. The polarisation resistance of all the samples increases with the immersion time. The polarization resistances are largest and decrease when increasing the content of Cu. Cu reduces the Ag-Pd alloy corrosion resistance. The present study, thought limited, has shown that electrochemical characteristics can be use to identify such alloys. Knowledge of the in vitro corrosion behaviour of these alloys may lead to better understanding of any biologically adverse effects in vitro.

scholarly journals Influence of Ultrasonic Excitation Sealing on the Corrosion Resistance of HVOF-Sprayed Nanostructured WC-CoCr Coatings under Different Corrosive Environments

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 724 ◽  
Author(s):  
Zhang ◽  
Hong ◽  
Lin ◽  
Zheng
Keyword(s):  
Corrosion Resistance ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Corrosion Current ◽  
Aluminum Phosphate ◽  
Open Circuit ◽  
Corrosive Environments ◽  
Oxygen Fuel

The corrosion behavior of unsealed and sealed high-velocity oxygen-fuel (HVOF)-sprayed nanostructured WC-CoCr cermet coatings under different corrosive environments was investigated using scanning electron microscopy (SEM), open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Ultrasonic excitation sealing with aluminum phosphate was performed in an external ultrasonic bath with the frequency of 40 kHz at atmospheric pressure and room temperature. SEM micrographs revealed that the exposed area of the coating was effectively reduced by the coverage of aluminum phosphate sealant on the majority of pores. Electrochemical measurements demonstrated that the sealant with the help of ultrasonic energy could shift the corrosion potential to a more noble direction, reduce the corrosion current density, increase the resistance of charge transfer, and effectively improve the corrosion resistance of the coating in both 3.5 wt % NaCl and 1 mol·L−1 HCl solutions.

scholarly journals Effect of Cu Addition on the Electrochemical Corrosion Performance of Ni3Al in 1.0 M H2SO4

2015 ◽  
Vol 2015 ◽  
pp. 1-18 ◽  
Author(s):  
J. Porcayo-Calderon ◽  
R. A. Rodriguez-Diaz ◽  
E. Porcayo-Palafox ◽  
J. Colin ◽  
A. Molina-Ocampo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Open Circuit ◽  
Intermetallic Alloy ◽  
Intermetallic Alloys ◽  
Corrosion Performance ◽  
Linear Polarization Resistance ◽  
Electrochemical Corrosion Behavior

The effect of Cu addition on the electrochemical corrosion behavior of Ni3Al intermetallic alloy was investigated by potentiodynamic polarization, open-circuit potential, linear polarization resistance, and electrochemical impedance spectroscopy in 1.0 M H2SO4solution. Performance of the pure elements (Cu, Ni, and Al) was also evaluated. In general, Cu addition improved the corrosion resistance of Ni3Al. Electrochemical measurements show that corrosion resistance of Ni3Al-1Cu alloy is lower than that of other intermetallic alloys and pure elements (Ni, Cu, and Al) in 1.0 M H2SO4solution at 25°C. Surface analysis showed that the Ni3Al alloys are attacked mainly through the dendritic phases, and Cu addition suppresses the density of dendritic phases.

Corrosion Resistance of Modified Silane Films Formed on AZ31 Magnesium Alloys

2011 ◽  
Vol 686 ◽  
pp. 21-25
Author(s):  
Xian Long Cao ◽  
Fu Sheng Pan ◽  
Hong Da Deng ◽  
Wei Cai
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Chloride Ions ◽  
Cerium Nitrate ◽  
Az31 Magnesium Alloy ◽  
Sodium Chloride Solutions

This present work investigated the corrosion behavior of AZ31 magnesium alloy substrates pre-treated with bis-[triethoxysilylpropyl] tetrasulfide silane modified with cerium nitrate. The corrosion behavior of the pre-treated substrates in 0.005M sodium chloride solutions was assessed by potentiodynamic polarization, open circuit potential and electrochemical impedance spectroscopy (EIS). The results showed that the silane pre-treatments improved the corrosion resistance of the AZ31 magnesium alloy substrates in the presence of chloride ions. Especially the addition of cerium nitrate played an important role in reducing the corrosion activity.

scholarly journals Corrosion Resistance of the CpTi G2 Cellular Lattice with TPMS Architecture for Gas Diffusion Electrodes

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 81
Author(s):  
Bożena Łosiewicz ◽  
Joanna Maszybrocka ◽  
Julian Kubisztal ◽  
Grzegorz Skrabalak ◽  
Andrzej Stwora
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Pure Titanium ◽  
Total Porosity ◽  
Complex Surface ◽  
Potential Method ◽  
Gas Diffusion ◽  
Open Circuit ◽  
Commercially Pure Titanium ◽  
Titanium Grade

The corrosion of materials used in the design of metal-air batteries may shorten their cycle life. Therefore, metal-based materials with enhanced electrochemical stability have attracted much attention. The purpose of this work was to determine the corrosion resistance of commercially pure titanium Grade 2 (CpTi G2) cellular lattice with the triply periodic minimal surfaces (TPMS) architecture of G80, D80, I-2Y80 in 0.1 M KOH solution saturated with oxygen at 25 °C. To produce CpTi G2 cellular lattices, selective laser melting technology was used which allowed us to obtain 3D cellular lattice structures with a controlled total porosity of 80%. For comparison, the bulk electrode was also investigated. SEM examination and statistical analysis of the surface topography maps of the CpTi G2 cellular lattices with the TPMS architecture revealed much more complex surface morphology compared to the bulk CpTi SLM. Corrosion resistance tests of the obtained materials were conducted using open circuit potential method, Tafel curves, anodic polarization curves, and electrochemical impedance spectroscopy. The highest corrosion resistance and the lowest material consumption per year were revealed for the CpTi G2 cellular lattice with TPMS architecture of G80, which can be proposed as promising material with increased corrosion resistance for gas diffusion in alkaline metal-air batteries.

scholarly journals Corrosion Resistance Test of Electroplated Gold and Palladium Using Fast Electrochemical Analysis

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 405
Author(s):  
Walter Giurlani ◽  
Patrick Marcantelli ◽  
Francesco Benelli ◽  
Daniele Bottacci ◽  
Filippo Gambinossi ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Standardized Tests ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Corrosion Current ◽  
Electrochemical Analysis ◽  
Open Circuit ◽  
Metal Coatings ◽  
High Impedance

Noble metal coatings are commonly employed to improve corrosion resistance of metals in the electronic and jewellery industry. The corrosion resistance of electroplated goods is currently determinate with long, destructive and almost subjective interpretation corrosion tests in artificial atmosphere. In this study we present the application of electrochemical analysis to obtain fast and numerical information of the antiaging coating. We performed open circuit potential (OCP) and corrosion current measurement; we employed also the electrochemical impedance spectroscopy (EIS), commonly applied to organic or passivated metal with high-impedance, to find the best option for noble low-impedance coating analysis. For comparison, traditional standardized tests (damp heat ISO 17228, salt spray ISO 9227 and sulphur dioxide ISO 4524) were also performed.

Corrosion Behaviour of Ni-Cr Based Biomaterials in Rondelli Saliva

2008 ◽  
Vol 59 (4) ◽  
Author(s):  
Daniel Sutiman ◽  
Adrian Cailean ◽  
Igor Cretescu ◽  
Mircea Nechita ◽  
Daniel Mareci
Keyword(s):  
Corrosion Resistance ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Open Circuit ◽  
Corrosion Process ◽  
Passive Region ◽  
Passive Transition ◽  
Film Electrolyte ◽  
Stable Passive

The corrosion behaviour of nickel-based alloys (Heraenium, Verabond and V alloy) in simulated saliva was studied by gravimetric, pH-metric and conductometric methods, as well as by potentiodynamic polarization and by electrochemical impedance spectroscopy (EIS). The main parameters of the corrosion process were established. Additionally, the results obtained with SEM and AAS analyses were reported. All alloys pass directly into a stable passive region, without exhibiting the usual active-passive transition. The EIS results show that a Ni-based alloy exhibits passivity at open circuit potential. The proposed equivalent circuit contains two R-CPE elements in parallel. The physical meaning given to the circuit is the association of the film/electrolyte interface with the passive film itself. The corrosion resistance of the studied non-precious alloys is in the following order: Heraenium alloy ] V alloy ] Verabond alloy.

Corrosion Behavior of Porous Ti-24Nb-4Zr Alloy in Different Simulated Body Fluids

2011 ◽  
Vol 399-401 ◽  
pp. 1577-1581
Author(s):  
Yu Xuan Li ◽  
Zhen Duo Cui ◽  
Xian Jin Yang ◽  
Sheng Li Zhu
Keyword(s):  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Ph Values ◽  
Porous Ti ◽  
Ti Alloys ◽  
Excellent Corrosion Resistance ◽  
Conventional Sintering

Porous Ti alloys are novel biomedical candidates for surgical implant application. The corrosion resistance of porous Ti-24Nb-4Zr alloy with 41.54% porosity prepared from conventional sintering was investigated by means of open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy techniques in 0.9% NaCl physiological and Hank’s solutions with different pH values (2.4, 5.4, 7.4) at 310 K, respectively. Meaning solid Ti-24Nb-4Zr alloy was chosen as a reference. Porous Ti-24Nb-4Zr alloy shows wide passive regions based on anodic polarization curves. These observations suggest that porous Ti-24Nb-4Zr alloy owns excellent corrosion resistance. Therefore, they are potential for biomedical applications.

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