scholarly journals Study on the Behavior of Dental Alloy CoCrWNbMoV in Artificial Saliva

2019 ◽  
Vol 70 (1) ◽  
pp. 165-168
Author(s):  
Adrian Alexandru ◽  
Ramona Cimpoesu ◽  
Anca Melian ◽  
Mihaela Salceanu
Keyword(s):  
Corrosion Resistance ◽  
Artificial Saliva ◽  
Dental Materials ◽  
Electrolyte Solutions ◽  
Dental Alloy ◽  
Chemical Dispersion ◽  
X Ray ◽  
Eds Analysis ◽  
Cocrmo Alloys ◽  
Resistance Tests

Dental materials represent an important market worldwide. For solutions that are currently financially acceptable, CoCr or CoCrMo alloys have been an affordable option for all dental technicians. Constant improvements in the properties of this alloy such as corrosion resistance and hardness have been pursued. In this paper are presented some experimental results obtained from the electro-corrosion resistance analysis of the CoCrWNbMoV alloy in two electrolyte solutions made from artificial saplings Afnor and respectively Duffo Quezada. Following electro-corrosion resistance tests, the surface of the alloy was characterized by optical and electron microscopy (OM and SEM) and chemical dispersion X-ray (EDS) analysis.

Microstructure and Corrosion Resistance Characteristics of Cr-Co-Mo Alloys Designed for Prosthetic Materials

2013 ◽  
Vol 58 (4) ◽  
pp. 1281-1285 ◽  
Author(s):  
J. Augustyn-Pieniążek ◽  
A. Lukaszczyk ◽  
R. Zapala
Keyword(s):  
Solid Solution ◽  
Corrosion Resistance ◽  
Chemical Composition ◽  
Electron Microprobe ◽  
Artificial Saliva ◽  
Polarization Curves ◽  
Local Analysis ◽  
High Corrosion Resistance ◽  
X Ray ◽  
Resistance Tests

Abstract The work presents the results of microscopic tests of two alloys: Co-Cr-Mo and Co-Cr-W-Mo, together with a quantitative local analysis of the chemical composition, with the use of an electron microprobe X-ray analyzer EDS. Corrosion resistance tests were also performed on the alloys, in the artificial saliva environment. The microstructure of the examined alloys was of the dendrite type. An eutectic consisting of alloy carbides and a cobalt austenite was observed in the interdendritic spaces. The dendritic matrix was a solid solution of chromium, molybdenum and carbon in cobalt (Co), and the precipitates present in the interdendritic spaces were rich with Cr and Mo - in the case of Co-Cr-Mo - and with W and Mo - in the case of Co-Cr-W-Mo. The analyzed materials exhibited a similar progress of polarization curves. The obtained currentless potential values and the wide passivation area of those alloys made it possible to conclude their high corrosion resistance in the examined environment.

scholarly journals Effect of Molybdenum Content on the Corrosion and Microstructure of Low-Ni, Co-Free Maraging Steels

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 852
Author(s):  
Asiful H. Seikh ◽  
Hossam Halfa ◽  
Mahmoud S. Soliman
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Microstructural Analysis ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Alloying Element ◽  
X Ray ◽  
Maraging Steels ◽  
Eds Analysis ◽  
Electroslag Refining

Molybdenum (Mo) is an important alloying element in maraging steels. In this study, we altered the Mo concentration during the production of four cobalt-free maraging steels using an electroslag refining process. The microstructure of the four forged maraging steels was evaluated to examine phase contents by optical microscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. Additionally, we assessed the corrosion resistance of the newly developed alloys in 3.5% NaCl solution and 1 M H2SO4 solution through potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Furthermore, we performed SEM and energy-dispersive spectroscopy (EDS) analysis after corrosion to assess changes in microstructure and Raman spectroscopy to identify the presence of phases on the electrode surface. The microstructural analysis shows that the formation of retained austenite increases with increasing Mo concentrations. It is found from corrosion study that increasing Mo concentration up to 4.6% increased the corrosion resistance of the steel. However, further increase in Mo concentration reduces the corrosion resistance.

scholarly journals Transverse Micro Radiography Analysis of the Effect of Experimental Calcium-Containing Primer System on Demineralized Enamel

Crystals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1087
Author(s):  
Yusuke Koshimitsu ◽  
Go Inoue ◽  
Mahmoud Sayed ◽  
Amr Saad ◽  
Masaomi Ikeda ◽  
...  
Keyword(s):  
Storage Time ◽  
Artificial Saliva ◽  
Mineral Density ◽  
X Ray ◽  
Eds Analysis ◽  
Mineral Deposition ◽  
Demineralized Enamel ◽  
Storage Times ◽  
Additional Mineral ◽  
Mineral Loss

Background: Enamel mineral density is dependent on a balanced dynamic process of demineralization and remineralization. Objective: We evaluated the remineralization potential of experimental calcium- containing primer (CaP) application on enamel subsurface lesions. Methods: Demineralized enamel samples obtained from bovine incisor teeth were prepared and cut buccolingually. All samples were divided into 4 main groups according to the type of primer: CLEARFIL SE BOND 2 Primer (SEP), experimental calcium-containing primer (CaP) and bond: CLEARFIL SE BOND 2 Bond (SEB), CLEARFIL Protect Bond (PBB) treatment: (1) SEP-SEB (2) SEP-PBB (3) CaP-SEB (4) CaP-PBB. Each group was subdivided according to storage time in artificial saliva: immediately, 1 month and 6 months. Then, the samples were analyzed using transverse micro radiography (TMR). Additionally, the samples treated with each primer were prepared for scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) observation. Two-way ANOVA was used for the statistical analysis of mineral loss (ΔZ: vol%·µm). Results: CaP-PBB had the significantly lowest ΔZ at all storage times, while SEP-SEB had the highest ΔZ (p < 0.05). SEM observations revealed that new crystals were formed on the surface after 6 months, and the ratio of calcium on the enamel increased in the EDS analysis. Conclusion: Experimental calcium-containing primer can provide additional mineral deposition, with even further deposition when combined with a fluoride-containing bond.

scholarly journals Enhanced Corrosion Resistance of SiCp/ 2009 Al by Cerium and Lanthanum Conversion Treatment

2018 ◽  
Vol 778 ◽  
pp. 251-255
Author(s):  
Irfan Aziz ◽  
Qi Zhang
Keyword(s):  
Corrosion Resistance ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Localized Corrosion ◽  
Al Alloy ◽  
Unreinforced Alloy ◽  
Maximum Increase ◽  
X Ray ◽  
Eds Analysis ◽  
Polarization Studies

The present study investigates the effect of lanthanide chlorides conversion coatings on the corrosion response of the 2009 Al alloy and SiCp reinforced 2009 Al MMCs. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies showed that the localized corrosion resistance increased after treatments with solutions having various combinations of CeCl3.7H2O and LaCl3.7H2O, with maximum increase noticed for 5000ppm CeCl3.7H2O. It was found that the protection degree effect obtained under similar coating conditions for 25 vol.% SiCp/2009 Al was relatively higher than 15vol.% SiCp/ 2009 Al MMC, but both of them were less than that of the unreinforced alloy. Scanning electron microscopy (SEM) accompanied with energy dispersive spectroscopy (EDS) analysis revealed the deposition of Ce and/ or La oxides/ hydroxides on cathodic intermetallics/ SiCp and the existence of crevices at the SiCp/ matrix interfaces. X-ray photoelectron spectroscopy (XPS) results indicated that Ce was incorporated as Ce3+ and Ce4+ species in the coatings.

scholarly journals Estudo de revestimentos de liga de níquel aplicados por soldagem em aço API 5L Gr B

2018 ◽  
Vol 1 (43) ◽  
pp. 212
Author(s):  
Marcos Mesquita da Silva ◽  
Gabrielly Santana Cardoso ◽  
Theophilo Moura Maciel ◽  
Marco Antonio dos Santos ◽  
Renato Alexandre Costa de Santana ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Arc Welding ◽  
Oil And Gas ◽  
Filler Metal ◽  
Submerged Arc Welding ◽  
X Ray ◽  
Ni Alloy ◽  
Oil And Gas Sector ◽  
Submerged Arc ◽  
Resistance Tests

<p>The aim of this study was to evaluate different weld coatings of Ni alloy applied by the process of submerged arc welding (SAW) on API 5L Gr B steel used in the Oil and Gas Sector. The weldings were made with an AWS ERNiCrMo-4 filler metal of 1,14mm-diameter and an agglomerated, basic fluoride and non-alloying flux. Three weld coatings were made, two of them with pulsed and one with conventional current. Then, these weld coatings were characterized according to microhardness, optical microscopy, Energy-dispersive X-ray spectroscopy (EDX) and corrosion resistance tests. The results showed that the coating applied with conventional current presented lower dilution levels, higher width and height, and higher corrosion resistance when compared to the coatings applied with pulsed current</p>

scholarly journals The Influence of Nitrogen Absorption on Microstructure, Properties and Cytotoxicity Assessment of 316L Stainless Steel Alloy Reinforced with Boron and Niobium

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 506 ◽  
Author(s):  
Sadaqat Ali ◽  
Ahmad Majdi Abdul Rani ◽  
Riaz Ahmad Mufti ◽  
Farooq I. Azam ◽  
Sri Hastuty ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Photoelectron Spectroscopy ◽  
316L Stainless Steel ◽  
Artificial Saliva ◽  
Alloy System ◽  
Sample Surface ◽  
Nickel Ions ◽  
X Ray ◽  
Cytotoxicity Assessment

In the past, 316L stainless steel (SS) has been the material of choice for implant manufacturing. However, the leaching of nickel ions from the SS matrix limits its usefulness as an implant material. In this study, an efficient approach for controlling the leaching of ions and improving its properties is presented. The composition of SS was modified with the addition of boron and niobium, which was followed by sintering in nitrogen atmosphere for 8 h. The X-ray diffraction (XRD) results showed the formation of strong nitrides, indicating the diffusion of nitrogen into the SS matrix. The X-ray photoelectron spectroscopy (XPS) analysis revealed that a nitride layer was deposited on the sample surface, thereby helping to control the leaching of metal ions. The corrosion resistance of the alloy systems in artificial saliva solution indicated minimal weight loss, indicating improved corrosion resistance. The cytotoxicity assessment of the alloy system showed that the developed modified stainless steel alloys are compatible with living cells and can be used as implant materials.

scholarly journals Investigation of the Microstructure, Hardness and Corrosion Resistance of a New 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn Dental Alloy

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4199 ◽  
Author(s):  
Dan Gheorghe ◽  
Ion Pencea ◽  
Iulian Vasile Antoniac ◽  
Ramona-Nicoleta Turcu
Keyword(s):  
Solid Solution ◽  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Artificial Saliva ◽  
Complex Structure ◽  
Electrochemical Corrosion ◽  
Dental Alloy ◽  
Dental Alloys ◽  
Cu Content ◽  
Electrochemical Corrosion Behavior

Higher-noble dental alloys (Au, Ag, and Pd) are the most desirable for dentistry applications, but they are expensive. Low-noble (Ag, Pd, Cu) dental alloys are alternatives to higher-noble ones due to their lower price. In this regard, the paper supports the price lowering of dental alloy by increasing the Cu content, i.e., a new 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn dental alloy. The increasing addition of the Cu leads to a complex structure consisting of a solid solution that engulfs compounds of micrometric and nanometric sizes. The 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn has demonstrated a much better electrochemical corrosion behavior in artificial saliva compared to the Paliag and Unique White dental alloys. The improved corrosion behavior of the new alloy is supported by the diminishing of the Cu selective diffusion into the electrolyte due to its retaining into compounds and into Ag-Pd solid solution. Also, the synergic effects of Cu, Zn, In, Sn may improve the corrosion resistance, but they have strengthened the 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn matrix. The main finding addressed in the paper consists in a new 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn dental alloy with improved corrosion resistance in artificial saliva.

In Vitro Corrosion Behaviour of Metallic Dental Materials

2015 ◽  
Vol 1114 ◽  
pp. 258-265 ◽  
Author(s):  
Diana Maria Vrânceanu ◽  
Mihai Tarcolea ◽  
Ana Iulia Gherghilescu ◽  
Florin Miculescu ◽  
Mihai Cosmin Cotrut
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Corrosion Behaviour ◽  
Artificial Saliva ◽  
Dental Materials ◽  
Ti6al4v Alloy ◽  
Solution Ph ◽  
Cp Ti ◽  
Selection Of

Typical applications of metallic dental materials include metal-ceramic restorations, dental implants or orthodontic systems. Due to their contact with human tissues, corrosion resistance is one of the main requirements for dental materials. In the present paper, the corrosion behaviour in Fusayama Meyer artificial saliva solution (pH=5.2) on a selection of four different metallic dental materials (316 L steel, Au based alloy, cp-Ti, Ti6Al4V alloy) currently used in dentistry were investigated. The metallic dental materials have been investigated in terms of electrochemical analysis, chemical composition, morphology before and after corrosion, wettability and roughness. The results showed a hydrophilic behaviour in the case of Au based alloy, cp-Ti and Ti6Al4V alloy, and hydrophobic for 316L stainless steel. Considering the main electrochemical parameters, the cp-Ti alloy exhibited better corrosion resistance in artificial saliva with pH=5.2, followed by Au based alloy, Ti6Al4V alloy and 316L stainless steel. The main objective of the present paper was to evaluate the corrosion behaviour, as in important factor in the selection of metallic materials used in dentistry.

scholarly journals Plasma Electrolytic Oxidation Treatment of Zr-2.5%Nb Alloy for Corrosion Resistance Enhancement

2019 ◽  
Vol 69 (12) ◽  
pp. 3490-3493
Author(s):  
Elisabeta Coaca ◽  
Alexandru Marin ◽  
Oana Rusu ◽  
Viorel Malinovschi ◽  
Victor Andrei
Keyword(s):  
Corrosion Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Aqueous Electrolyte ◽  
Oxide Coating ◽  
Electrolyte Solutions ◽  
X Ray Diffraction ◽  
Oxidation Treatment ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Anticorrosion layers were prepared on commercial Zr-2.5%Nb alloy by employing plasma electrolytic oxidation (PEO) process in aqueous electrolyte solutions. Microstructure and electrochemical behavior were evaluated using X-ray diffraction (XRD), optical metallography and potentiodynamic polarization measurements. The obtained coatings are uneven, presenting a dominant monoclinic crystallographic phase of ZrO2. Enhanced corrosion resistance was attributed to the PEO-treated samples compared to the commercial black oxide coating.

scholarly journals Electrochemical Deposition of Hydroxyapatite Co-Substituted By Sr/Mg Coating on Ti-6Al-4V ELI Dental Alloy Post-MAO as Anti-Corrosion

2020 ◽  
pp. 2751-2761
Author(s):  
Haider Abdulkareem AlMashhadani ◽  
Khulood Abed Saleh
Keyword(s):  
Adhesion Strength ◽  
Artificial Saliva ◽  
Electrochemical Techniques ◽  
Antimicrobial Properties ◽  
Dental Alloy ◽  
X Ray ◽  
Before And After ◽  
Electrochemically Deposited ◽  
Coated Alloy ◽  
Micro Arc Oxidation

This work involved the co-substitution of the two bioactive ions of strontium and magnesium into the hydroxyapatite (HA) coating which was then electrochemically deposited on Ti-6Al-4V ELI dental alloy (Gr.23) before and after treatment by Micro Arc Oxidation (MAO). The deposited layers were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The adhesion strength of the coating layer was estimated by using pull-off adhesion test. The adhesion strength of Sr/Mg-HA on the Ti-6Al-4V ELI dental alloy after MAO treatment was 1.79 MPa, which was higher than that before MAO treatment (1.62 MPa). The corrosion behavior of the alloy in artificial saliva environment at temperature ranged 293-323K was assessed by means of electrochemical techniques and potentiodynamic polarization curves. The corrosion protection to the alloy at 293K was increased from 67.98% before treatment by MAO to 75.87% after treatment. The antimicrobial properties of the coated alloy were evaluated against different bacteria and oral fungi (Candida).

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