Corrosion of Ferromagnetic Alloys used for Magnetic Retention of Overdentures

1987 ◽  
Vol 66 (9) ◽  
pp. 1456-1459 ◽  
Author(s):  
M.M.A. Vrijhoef ◽  
P.R. Mezger ◽  
J.M. Van der Zel ◽  
E.H. Greener
Keyword(s):  
Saline Solution ◽  
Artificial Saliva ◽  
Electrochemical Corrosion ◽  
Potential Range ◽  
Good Corrosion Resistance ◽  
Ferromagnetic Alloys ◽  
Casting Alloys ◽  
Oral Environment ◽  
Electrochemical Corrosion Behavior ◽  
Magnetic Retention

Three ferromagnetic casting alloys intendedfor use with magnetically retained overdentures (compositions in wt%: #1, Pd 50, Co 47, Ga 2, Pt 1 ; #2, Pd 60, Co 37, Ga 2, Pt 2; #3, Pd 49, Co 46, Ga 2, Pt 2) were investigated. A 0.9% saline solution and an artificial saliva (Meyer) were used for evaluation of the electrochemical corrosion behavior of these alloys, utilizing standard potentiodynamic techniques. All alloys investigated possessed a good corrosion resistance in the potential range of the oral environment (from - -100 to 300 mV versus SCE). In addition, alloys #1 and 3 appeared to be susceptible to pitting above +300 mV (SCE), while #2 was resistant to pitting and was found to passivate in 0.9% saline solution.

Electrochemical Corrosion Behavior of Dental/Implant Alloys in Artificial Saliva

2008 ◽  
Vol 17 (5) ◽  
pp. 695-701 ◽  
Author(s):  
Mohit Sharma ◽  
A.V. Ramesh Kumar ◽  
Nirbhay Singh ◽  
Nidhi Adya ◽  
Bobin Saluja
Keyword(s):  
Dental Implant ◽  
Corrosion Behavior ◽  
Artificial Saliva ◽  
Electrochemical Corrosion ◽  
Electrochemical Corrosion Behavior ◽  
Implant Alloys

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.

Electrochemical (Corrosion) Behavior of Amorphous/Microcrystalline Ion Plated Fe-Cr Alloy Films

CORROSION ◽  
1982 ◽  
Vol 38 (6) ◽  
pp. 314-318 ◽  
Author(s):  
Welville B. Nowak ◽  
Boniface A. Okorie
Keyword(s):  
Electrochemical Corrosion ◽  
Passive Layer ◽  
Current Data ◽  
Constant Current ◽  
Potential Range ◽  
Potential Region ◽  
Crystalline Substrate ◽  
Electrochemical Corrosion Behavior ◽  
Transient Data ◽  
Current Relaxation

Abstract Amorphous and microcrystalline thin films of chromium-bearing iron alloys produced by ion plating exhibit high resistance to localized (pitting) corrosion in neutral NaCl aqueous solutions. The films are produced by thermal evaporation of the alloys through an argon glow discharge onto Ebrite (Fe-Cr) substrates maintained at low temperatures. Potentiodynamic tests indicate that the ion plated films exhibit a Tafel-like behavior in the “passive” potential range, whereas Ebrite and melt-spun amorphous alloys of composition similar to the films have a constant current passive region. Transient current data obtained from tests at successively higher potentiostatic voltages (V) show that such currents decrease exponentially with time. The current relaxation time constant (τ) of the films are five to ten times larger than those of Ebrite, and increases rapidly with V up to about 0.3 V, decreasing slowly thereafter. For the Ebrite substrate, τ shows only increasing values, but with a sharp discontinuity in the V versus τ curve at about 0.4 V. Transient data obtained for bulk amorphous Metglas 2826A above 0.5 V shows that the variation of τ with V is similar to that of the ion plated films. The results indicate that it takes longer to complete the passive layer on the ion plated films than on the crystalline substrate; the decrease in τ with increasing V in the middle potential region may be related to the amorphous or amorphous/microcrystalline structure of Metglas 2826A and the ion plated films. The results are consistent with a change in the character of the passive layer at 0.3 to 0.4 V.

scholarly journals Corrosion Susceptibility of Stainless Steel in Artificial Saliva Containing Citric Acid

2021 ◽  
Author(s):  
Chioma J. Okereke ◽  
Chibueze Paul Onyenegecha ◽  
Ifeanyi Jude Njoku
Keyword(s):  
Citric Acid ◽  
Inhibition Efficiency ◽  
Electrochemical Cell ◽  
Artificial Saliva ◽  
Electrochemical Corrosion ◽  
Corrosion Rates ◽  
Study Results ◽  
Oral Environment ◽  
Corrosion Susceptibility ◽  
Electrochemical Corrosion Test

Abstract ObjectivesThe aims of this study are to investigate the effect of concentration of citric acid in saliva environment on SS 316L and effect of ginger and garlic on SS 316L corrosion in citric acid-containing saliva environment.Methods.Seven SS 316L specimen of dimensions 1cm × 1cm were used for this study. The specimen were subjected to electrochemical corrosion test using an in artificial saliva containing citric acid with varying concentrations of 0.0 g/l, 3.0 g/l, 6.0 g/l, and 9.0 g/l electrochemical cell. 10 g/l each of garlic and ginger were also added to two of artificial saliva samples containing citric acid and one sample of artificial saliva contained 5 g/l of ginger and 5 g/l of garlic added together so as to study the corrosion effects of these substances on the SS 316L specimen in saliva environment. The results were displayed based on Tafel’s plot of current density against potential difference. Also, corrosion rates of the samples were determined and presented in graphical form.Results.The study results showed that citric acid is a good inhibitor of corrosion of SS 316L dental implant in oral environment with its inhibition efficiency depending on its concentration, and that the mechanism of this inhibition can attributed to the adsorption of citric acid onto the metal alloy (SS 316L) surface. The study also concluded that both ginger and garlic are promoters of corrosion of SS 316L alloy implants in saliva environment.

scholarly journals Influence of Chloride Ions on Electrochemical Corrosion Behavior of Dual-Phase Steel over Conventional Rebar in Pore Solution

2020 ◽  
Vol 10 (13) ◽  
pp. 4568
Author(s):  
Hany S. Abdo ◽  
Asiful H. Seikh ◽  
Jabair A. Mohammed ◽  
Monis Luqman ◽  
Sameh A. Ragab ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Pore Solution ◽  
Electrochemical Corrosion ◽  
Chloride Ions ◽  
Dual Phase ◽  
Good Corrosion Resistance ◽  
Main Challenge ◽  
Electrochemical Corrosion Behavior

Reinforced steel bars (rebar) are extensively used in construction, and the main challenge is in minimizing corrosion due to oxide or passive layer breakdown. In contrast, dual-phase (DP) steel has good corrosion resistance. This study investigated the effect of Cl− ions on the electrochemical corrosion behavior of DP rebar and conventional rebar. Corrosion behavior studies and electrochemical measurements were conducted on DP rebar and conventional rebar in simulated concrete pore solution with different concentrations of Cl− ions. Microstructure analysis, surface morphology analysis, and corroded surface characterization were performed using optical microscopy, field emission scanning electron microscopy, and Raman spectroscopy, respectively. Potentiodynamic polarization and electrochemical impedance spectroscopy measurements revealed that DP rebar has good passivity, leading to better corrosion resistance and greater strength compared to ordinary rebar. In addition, DP rebar showed better passivity behavior compared to conventional rebar in alkaline solution. Therefore, the presence of a dual phase (ferrite and martensite) in reinforced concrete structured steel induces good corrosion resistance.

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