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.

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.

Interaction between Sodium Molybdate and FSWed Wled of 5083 Effected by Time

2013 ◽  
Vol 699 ◽  
pp. 645-649
Author(s):  
Chang Bin Shen
Keyword(s):  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Sodium Molybdate ◽  
Impedance Spectra ◽  
Electrochemical Impedance Spectra ◽  
Friction Stir ◽  
Base Materials ◽  
Corrosion Behaviors ◽  
5083 Aluminum Alloy

Similar welds composed of 5083 were produced by friction stir welding. In the solution of 0.2 M NaHSO3 and 0.6 M NaCl, with the addition of a given concentration sodium molybdate as the inhibitor, the electrochemical corrosion behaviors of the friction stir welds (FSW) and 5083 were comparatively investigated by potentiodynamic polarization curve tests and electrochemical impedance spectra (EIS) at the ambient temperature for different test periods. The results indicated that : with the extension of period, the inhibition efficiencies (IE) for both the weld and 5083 base materials enhanced, at the same period, the inhibition efficiency (IE) for the weld was beyond that for 5083 base materials, sodium molybdate may be thought of as an effective inhibitor for 5083 aluminum alloy, the interaction between inhibitor and weld is stronger than that between inhibitor and base materials.

scholarly journals The Kinetics Of Ti-1Al-1Mn Alloy Thermal Oxidation And Charcteristic Of Oxide Layer

2015 ◽  
Vol 60 (2) ◽  
pp. 735-738 ◽  
Author(s):  
D. Klimecka-Tatar ◽  
S. Borkowski ◽  
P. Sygut
Keyword(s):  
Titanium Alloy ◽  
Artificial Saliva ◽  
Electrochemical Corrosion ◽  
Mass Gain ◽  
Ti Alloy ◽  
Metallic Materials ◽  
Cyclic Annealing ◽  
Air Atmosphere ◽  
Kinetic Oxidation ◽  
Kinetics Of

Abstract The main goal of the study was to carry out the treatment of cyclic oxidation of Ti alloy (Ti-1Al-1Mn) in air atmosphere. Based on measurements of mass gain of titanium alloy samples (Ti-1Al-1Mn) the kinetic oxidation curves during cyclic annealing were determined. The oxidized surface of the titanium alloy was carefully observed with optical microscopy equipment and the geometrical development, shape and surface morphology were defined. The phase composition of the obtained oxide layers on the Ti-alloy with qualitative analysis of the X-ray were defined. Since titanium alloys are among the most widely used metallic materials in dental prosthetics the corrosion measurements in a solution simulating the environment of the oral cavity were carried out. The results confirmed that the used titanium alloy easily covered with oxides layers, which to some extent inhibit the processes of electrochemical corrosion in artificial saliva solution.

scholarly journals Effect of the Esterification of Starch with a Mixture of Carboxylic Acids from Yarrowia lipolitica Fermentation Broth on Its Selected Properties

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1383 ◽  
Author(s):  
Ewa Zdybel ◽  
Tomasz Zięba ◽  
Ewa Tomaszewska-Ciosk ◽  
Waldemar Rymowicz
Keyword(s):  
Citric Acid ◽  
Carboxylic Acids ◽  
Fermentation Broth ◽  
Potato Starch ◽  
Thermal Characteristics ◽  
Degree Of Substitution ◽  
Process Conditions ◽  
Study Results ◽  
Yeast Production ◽  
Roasting Temperature

Potato starch was esterified with carboxylic acids contained in the fermentation broth from Yarrowia lipolitica yeast production. Various acid concentrations and various roasting temperatures were used to determine effects of process conditions on ester properties, including the number of acid residues attached to starch chains, starch susceptibility to amylolysis, and thermal characteristics of starch phase transitions. Study results demonstrated the effect of both the composition and the dose of the fermentation broth and of roasting temperature of starch on the number of acid residues attached to starch chains. Citric acid was more susceptible to esterification with starch (DS = 5.65%) compared to the α-ketoglutaric acid (DS = 0.12%). In the case of the latter, a higher degree of substitution was determined in the esters produced at higher roasting temperatures. The lowest digestibility (RS = 20%) was demonstrated for the starch esters with the highest degree of substitution with citric acid, whereas all starch esters showed decreased values of the thermal characteristics of pasting.

scholarly journals Molar Ratio Effect of Sodium to Chloride Ions on the Electrochemical Corrosion of Alloy 600 and SA508 in HCl + NaOH Mixtures

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1970
Author(s):  
Do Haeng Hur ◽  
Jeoh Han ◽  
Jun Choi
Keyword(s):  
Electrochemical Corrosion ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Molar Ratio ◽  
Alloy 600 ◽  
Galvanic Coupling ◽  
Ratio Effect ◽  
Molar Ratios ◽  
Corrosion Rates ◽  
A Value

This study aims to investigate the molar ratio effect of sodium to chloride ions on the corrosion of an Alloy 600 steam generator tube and an SA508 tubesheet material. The corrosion behavior was evaluated in solutions with three different molar ratios of sodium to chloride ions using a potentiodynamic polarization method. The corrosion potentials and corrosion rates of both the two materials were significantly decreased as the molar ratio increased from 0.1 to 10. Therefore, it is recommended that the molar ratio control to a value of 1 is beneficial only when the crevice chemistry has a low molar ratio with an acidic pH. The corrosion potentials and corrosion rates were little affected by the total sodium and chloride ion concentrations. SA508 acted as an anode and its corrosion rate was accelerated by galvanic coupling with Alloy 600.

scholarly journals Impact Of Strain In Drawing Process And Surface Modification On Resistance To Electrochemical Corrosion Of Wires Used In Dentistry

2015 ◽  
Vol 60 (3) ◽  
pp. 1865-1870
Author(s):  
J. Przondziono ◽  
E. Hadasik ◽  
W. Walke ◽  
J. Szala
Keyword(s):  
Surface Modification ◽  
Electrochemical Impedance ◽  
Artificial Saliva ◽  
Maxillofacial Surgery ◽  
Electrochemical Corrosion ◽  
Sudden Increase ◽  
Drawing Process ◽  
Corrosion Properties ◽  
The Impact ◽  
Modification Treatment

Abstract The study presents the results of research into the impact of strain in cold drawing and surface modification treatment on corrosion properties of wires made of X10CrNi 18-8 steel used in maxillofacial surgery. Scanning microscopy enabled to make images of the surface of wires after drawing process as well as after surface modification treatment. Resistance to electrochemical corrosion was evaluated on the ground of registered anodic polarisation curves in artificial saliva. In order to evaluate physical and chemical properties of the surface, electrochemical impedance spectroscopy was performed. Test results show deterioration of corrosion properties of wires along with strain taking place in drawing process. It was proved that electrochemical polishing and chemical passivation caused sudden increase of resistance of wires made of stainless steel to pitting corrosion in artificial saliva.

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