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 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.

scholarly journals Rinkite–nacareniobsite-(Ce) solid solution series and hainite from the Ilímaussaq alkaline complex: occurrence and compositional variation

2014 ◽  
Vol 62 ◽  
pp. 1-15
Author(s):  
Jørn G. Rønsbo ◽  
Henning Sørensen ◽  
Encarnacion Roda-Robles ◽  
François Fontan ◽  
Pierre Monchoux
Keyword(s):  
Solid Solution ◽  
Electron Microprobe ◽  
Compositional Variation ◽  
Solid Solution Series ◽  
Alkaline Complex ◽  
Full Extension ◽  
X Ray ◽  
Solution Series ◽  
Compositional Variations ◽  
A Minor

In the Ilímaussaq alkaline complex, minerals from the rinkite–nacareniobsite-(Ce) solid solution series have been found in pulaskite pegmatite, sodalite foyaite, naujaite and naujaite pegmatite from the roof sequence, and in marginal pegmatite, kakortokite and lujavrite from the floor sequence. The electron microprobe analyses embrace almost the full extension of the solid solution series and confirm its continuity. The solid solution series shows similar compositional variations in the roof and floor sequences: Rinkite members of the series are found in the less evolved rocks in the two sequences, whereas nacareniobsite-Ce members occur in the most evolved rocks and pegmatites in the two sequences. The REE (+Y) content varies from 0.83 atoms per formula unit (apfu) in rinkite from pulaskite pegmatite to 1.31 apfu in nacareniobsite-(Ce) from naujaite pegmatite. The main substitution mechanisms in the solid solution series investigated in this work are 2Ca2+ = Na+ + REE3+ and Ti4+ + Ca2+ = Nb5+ + Na+. The increased contents of Nb5+ and REE3+ are only to a minor degree compensated through the F1– = O2– substitution. The chondrite normalised REE patterns of the minerals develop in a similar way in the two sequences, showing relative La-enrichment and Y-depletion from the less to the most evolved rocks. Hainite has not previously been found in the Ilímaussaq complex. It was here identified in a pulaskite pegmatite sample by a combination of X-ray diffraction giving the unit cell dimensions a = 9.5923(7) Å, b = 7.3505(5) Å, c = 5.7023(4) Å, α = 89.958(2)°, β = 100.260(1)°, γ = 101.100(2)°, and X-ray powder pattern and electron microprobe data giving the empirical formula (Ca1.62 Zr0.16Y 0.22) (Na0.87Ca1.11) (Ca 1.65 REE0.35)Na(Ti0.81Nb0.09Fe0.08 Zr0.02)(Si2O7)2O0.99F2.96. Based on published and the present data it is documented that minerals from the hainite-götzenite solid solution series show a compositional variation between the ideal end members (Y,REE,Zr)Na2Ca4Ti(Si2O7)2OF3 and NaCa6Ti(Si2O7)2OF3.

X-ray Residual Stress Analysis of Zn-Ni Alloy Electroplating Layers

1989 ◽  
Vol 33 ◽  
pp. 171-175
Author(s):  
Toshihiko Sasaki ◽  
Makoto Kuramoto ◽  
Yasuo Yoshioka
Keyword(s):  
Residual Stress ◽  
Corrosion Resistance ◽  
Stress Analysis ◽  
Stress Measurement ◽  
Thin Layers ◽  
High Corrosion Resistance ◽  
Ray Method ◽  
X Ray ◽  
Ni Alloy ◽  
Residual Stress Analysis

Zn-Ni-alloy electroplated steels are one of the surface-treated materials with a high corrosion resistance and are mostly used for automobiles. It is said that the corrosion resistance is more than four times as great as that of Zn-plated steels. Concerning x-ray stress measurement, Kyono et al reported the result of measurement on y (552) planes and showed that the sin2φ diagram was severely curved.X-ray stress analysis in surface-treated materials will become more important. Some problems, however, remain to be studied when we apply the x-ray method to thin layers. For example, the effective x-ray penetration depth may be different from that in ordinary materials. And complex gradients of stresses and compositions may exist.

scholarly journals Corrosion Resistance of MgZn Alloy Covered by Chitosan-Based Coatings

2021 ◽  
Vol 22 (15) ◽  
pp. 8301
Author(s):  
Iryna Kozina ◽  
Halina Krawiec ◽  
Maria Starowicz ◽  
Magdalena Kawalec
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Photoelectron Spectroscopy ◽  
Multilayer Coating ◽  
Sem Analysis ◽  
Linear Sweep ◽  
High Corrosion Resistance ◽  
X Ray ◽  
Hank’S Solution

Chitosan coatings are deposited on the surface of Mg20Zn magnesium alloy by means of the spin coating technique. Their structure was investigated using Fourier Transform Infrared Spectroscopy (FTIR) an X-ray photoelectron spectroscopy (XPS). The surface morphology of the magnesium alloy substrate and chitosan coatings was determined using Scanning Electron Microscope (FE-SEM) analysis. Corrosion tests (linear sweep voltamperometry and chronoamperometry) were performed on uncoated and coated magnesium alloy in the Hank’s solution. In both cases, the hydrogen evolution method was used to calculate the corrosion rate after 7-days immersion in the Hank’s solution at 37 °C. It was found that the corrosion rate is 3.2 mm/year and 1.2 mm/year for uncoated and coated substrates, respectively. High corrosion resistance of Mg20Zn alloy covered by multilayer coating (CaP coating + chitosan water glass) is caused by formation of CaSiO3 and Ca3(PO4)2 compounds on its surface.

scholarly journals Effect of solid-solution and aging treatment on corrosion behavior of orthogonal designed and vacuum melted Mg-Zn-Ca-Mn alloys

2020 ◽  
Vol 18 ◽  
pp. 228080001988790 ◽  
Author(s):  
Dexue Liu ◽  
Tianshui Zhou ◽  
Zehua Liu ◽  
Bing Guo
Keyword(s):  
Solid Solution ◽  
Corrosion Resistance ◽  
Degradation Rate ◽  
Cast Alloy ◽  
Vacuum Induction Melting ◽  
Corrosion Properties ◽  
X Ray ◽  
Orthogonal Method ◽  
Heat Treated

Fast degradation rate and inhomogeneous corrosion are obstacles for magnesium alloy bio-corrosion properties. In this paper, a quaternary Mg-Zn-Ca-Mn alloy was designed by an orthogonal method and prepared by vacuum induction melting to investigate its bio-corrosion. Microstructure, corrosion morphology, and bio-corrosion properties of as-cast alloys 1 to 5 with good corrosion resistance were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction with immersion and electrochemical tests in simulated body fluid (SBF), respectively. Both the orthogonal method and in vitro degradation experiments demonstrated that alloy 3 exhibited the lowest degradation rate among the tested quaternary Mg-Zn-Ca-Mn alloys. Then, as-cast alloy 3 was treated by solid-solution and solid-solution aging. In vitro experimental results indicated that as-cast alloy 3 showed better corrosion resistance than heat-treated specimens and the average corrosion rate was approximately 0.15 mm/y. Heat-treated alloy 3 exhibited more uniform corrosion than as-cast alloy specimens. These results suggest that alloy 3 has the potential to become a biodegradable candidate material.

Study on Microstructure and Properties of Mg-9Al-xZn Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 477-480
Author(s):  
Xi Yan Zhang ◽  
Feng Jiang ◽  
Shi-jie Zhou ◽  
Chong Jia ◽  
Min Zhao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Corrosion Resistance ◽  
Chemical Composition ◽  
Close Relation ◽  
Microstructure And Properties ◽  
Solid Solution Strengthening ◽  
Mg17al12 Phase ◽  
Solution Strengthening ◽  
Zn Alloys

Some Zn and a little Ag are added into ZM5 magnesium alloy (one of Mg-9 wt%Al-1 wt%Zn alloys in China), and the differences of the microstructures and properties between the new alloy and ZM5 is investigated. Effects of heat treatment and alloying elements (Zn and Ag) on the microstructure and tensile properties of Mg-9Al-xZn alloys, and relationships between the chemical composition, microstructure and properties are investigated. Zn ad Ag have obvious solid solution strengthening effects on Mg-9Al-xZn alloy, while Ag is detrimental to the corrosion resistance after being artificial aged. The morphology of pearlite-like secondary γ(Mg17Al12) phase (γII) has close relation with the properties.

scholarly journals Joining of γ-TiAl Alloy to Ni-Based Superalloy Using Ag-Cu Sputtered Coated Ti Brazing Filler Foil

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 723 ◽  
Author(s):  
Sónia Simões ◽  
Carlos Tavares ◽  
Aníbal Guedes
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Scanning Electron Microscopy ◽  
Chemical Composition ◽  
Tial Alloy ◽  
Energy Dispersive ◽  
X Ray ◽  
Base Materials ◽  
Intermetallic Particles ◽  
Scanning Electron

Joining γ-TiAl alloy to Ni-based superalloy Hastelloy using Ag-Cu sputtered coated Ti foil as brazing filler was investigated in this study. Brazing experiments were performed at 900, 950, and 980 °C with a dwelling stage of 10 min in vacuum. The microstructure and the chemical composition of the resulting interfaces were analyzed by scanning electron microscopy (SEM) and by energy dispersive X-ray spectroscopy (EDS), respectively. Sound joints were produced after brazing at 980 °C, presenting a multilayered interface, consisting mainly of Ti-Al and Ti-Ni-Al intermetallics close to the γ-TiAl alloy, and of Ti-rich, Ti-Ni, and Cr-Ni-Mo rich phases near Hastelloy. The hardness of the interface, ranging from around 300 to 1100 HV0.01, is higher than both base materials, but no segregation of either Ag solid solution or coarse intermetallic particles was observed. Therefore, the developed brazing filler also avoids the need to perform post-brazing heat treatments that aim to eliminate detrimental extensive segregation of either soft phases or of hard and brittle compounds.

scholarly journals Corrosion Performance of Fe-Cr-Ni Alloys in Artificial Saliva and Mouthwash Solution

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
J. Porcayo-Calderon ◽  
M. Casales-Diaz ◽  
V. M. Salinas-Bravo ◽  
L. Martinez-Gomez
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Artificial Saliva ◽  
Electrochemical Techniques ◽  
Austenitic Stainless Steels ◽  
Open Circuit ◽  
Polarization Curves ◽  
Cyclic Polarization ◽  
Order Of Magnitude ◽  
Dental Applications

Several austenitic stainless steels suitable for high temperature applications because of their high corrosion resistance and excellent mechanical properties were investigated as biomaterials for dental use. The steels were evaluated by electrochemical techniques such as potentiodynamic polarization curves, cyclic polarization curves, measurements of open circuit potential, and linear polarization resistance. The performance of steels was evaluated in two types of environments: artificial saliva and mouthwash solution at 37°C for 48 hours. In order to compare the behavior of steels, titanium a material commonly used in dental applications was also tested in the same conditions. Results show that tested steels have characteristics that may make them attractive as biomaterials for dental applications. Contents of Cr, Ni, and other minor alloying elements (Mo, Ti, and Nb) determine the performance of stainless steels. In artificial saliva steels show a corrosion rate of the same order of magnitude as titanium and in mouthwash have greater corrosion resistance than titanium.

scholarly journals Structure and Mechanical Properties of Explosive Welded Mg/Al Bimetal/ Struktura I Właściwości Mechaniczne Połączenia Uzyskanego Metodą Zgrzewania Wybuchowego Bimetalu Mg/Al

2014 ◽  
Vol 59 (4) ◽  
pp. 1593-1597 ◽  
Author(s):  
D. Balga ◽  
D. Ostroushko ◽  
K. Saksl ◽  
E. Mazancová ◽  
O. Milković
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Phase Composition ◽  
Chemical Composition ◽  
Phase Transformations ◽  
Explosion Welding ◽  
Lattice Parameters ◽  
Diffraction Experiment ◽  
X Ray ◽  
Cubic Phases

Abstract In the article we analyzed shape, local mechanical properties, chemical and phase composition of Magnesium/Aluminium cladded material prepared by explosion welding. In particular we focus our investigation on Mg/Al interface and areas close to the joint. Hardness of the joined materials measured far from their interface is similar for both materials, however in the region of interface the hardness drops down by 40%. Phase transformations in the interface was examined by a hard X-ray micro-diffraction experiment performed at beamline P07 at PETRA III at the energy of 99 keV which helped us identify in Al: fcc-Al, Al2Cu tetragonal and Al7Cu2Fe tetragonal and in Mg: hcp-Mg, Mg2Si cubic phases. In the interface we haven’t observed any new intermetallics, but computation of lattice parameters and profiles of Al and Mg peaks proved an existence of solid solution with different gradient of chemical composition.

Crystal Structure and Chemical Composition of BIMEVOX (ME=Mn)

2010 ◽  
Vol 177 ◽  
pp. 66-69 ◽  
Author(s):  
Xiao Hua Yu ◽  
Hong Xing Gu ◽  
Gang Qin Shao ◽  
Bo Lin Wu ◽  
Shi Xi Ouyang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Chemical Composition ◽  
Dopant Concentration ◽  
Secondary Phase ◽  
Melting Method ◽  
X Ray ◽  
Energy Disperse Spectroscopy ◽  
Mn Dopant ◽  
Temperature Melting

The Bi2MnxV1-xO5.5- powders were synthesized by high temperature melting method. The effect of Mn dopant concentration on the crystal structure and chemical composition was studied. The crystal structure was determined by X-ray powder diffraction. The chemical composition was tested by X-ray fluorescence (XRF) and Energy Disperse Spectroscopy (EDS). When x < 0.2 the Aurivillius structure solid solution coexisted with few BiVO4. When 0.2 ≤ x ≤ 0.3 the γ-phase Bi2MnxV1-xO5.5- solid solution with tetragonal structure formed and the maximum Mn atomic content was 2.14%. When x ≥ 0.4 the manganese oxide secondary phase appeared. And when x = 0.8 the Bi7VO13 structure solid solution formed while the Aurivillius structure disappeared.

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