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.

Effect of Cu on the Electrochemical Corrosion Behavior of Sn-8Zn-3Bi Lead-Free Solder Alloy

2015 ◽  
Vol 1095 ◽  
pp. 95-98
Author(s):  
Li Ma ◽  
Qiang Hu ◽  
Yan Bin Sun
Keyword(s):  
Corrosion Resistance ◽  
Solder Alloy ◽  
Corrosion Behavior ◽  
Corrosion Potential ◽  
Electrochemical Corrosion ◽  
Lead Free ◽  
Lead Free Solder ◽  
Cu Content ◽  
Electrochemical Corrosion Behavior ◽  
Free Solder

The electrochemical corrosion behavior of the Sn-8Zn-3Bi-xCu lead-free solder in 3.5%NaCl solution was studied to reveal effect of Cu addition on the corrosion resistance of Sn-8Zn-3Bi solder alloy. The results showed that adding Cu element increased the corrosion potential of Sn-8Zn-3Bi-xCu solder alloysThe corrosion resistance of Sn-8Zn-3Bi-xCu solder alloys was improved correspondingly. The corrousion product of Sn-8Zn-3Bi-xCu alloy was mainly zinc oxide. More corrosion products were observed with the increse of Cu content.

Electrochemical Corrosion Behavior of Different Graphite Shapes Cast Irons in Acidic Solution

2014 ◽  
Vol 906 ◽  
pp. 275-282
Author(s):  
Zhu Huan Yu ◽  
Jun Feng Qiang ◽  
Hui Lu Li
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Driving Force ◽  
Acidic Solution ◽  
Electrochemical Corrosion ◽  
White Iron ◽  
Cast Irons ◽  
The Matrix ◽  
Electrochemical Corrosion Behavior

The effect of graphite shapes on the electrochemical corrosion behavior of cast iron was studied by means of weight loss tests, electrochemical measurements and electron microscopy. It was found that the electrochemical corrosion behavior of graphite is significantly different from one other, and the corrosive potential difference between carbide ad the matrix is the main driving force of the different phase corrosions. Among them, the center A type and edge D type graphite exhibited the highest corrosion resistance. The corrosion of white iron is worst, because there are so many type carbides in white iron and so there is an obvious tendency to produce micro-cell in white iron.

Electrochemical corrosion behavior and surface passivation of bulk nanocrystalline copper in alkaline solution

2020 ◽  
Vol 67 (5) ◽  
pp. 465-472
Author(s):  
Wei Luo ◽  
Lei Hu ◽  
Yimin Xv ◽  
Jian Zhou ◽  
Wentao Xv ◽  
...  
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Passive Film ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Electrochemical Corrosion ◽  
Content Type ◽  
Naoh Solution ◽  
Electrochemical Corrosion Behavior ◽  
Bulk Nanocrystalline

Purpose This paper aims to focus on an assessment of the electrochemical corrosion performance of bulk NC copper in a variety of corrosion environments. Design/methodology/approach The electrochemical corrosion behavior of bulk nanocrystalline (NC) copper prepared by inert gas condensation and in situ warm compress technique was studied by using potentiodynamic polarization and electrochemical impedance spectroscopy tests in de-aerated 0.1 M NaOH solution. Findings NC copper exhibited a typical active-passive-transpassive behavior with the formation of duplex passive films, which was qualitatively similar to coarse-grain (CG) copper. Although a compact passive film formed on NC copper surface, the corrosion resistance of NC copper was lower in comparison with CG copper. The increase in corrosion rate for NC copper was mainly attributed to the high activity of surface atoms and intergranular atoms. These atoms led to an enhancement of passive ability and an increase of dissolution rate of passive film in oxygen-deficiency solution. For NC copper, the corrosion resistance decreased as grain size increased in NC range. Originality/value The difference in corrosion resistance between bulk NC copper and its CG counterpart is dependent upon the corrosion solution. In a previous work, the potentiodynamic polarization tests revealed that NC copper bulks (grain size 48, 68, 92 nm) had identical corrosion resistance to CG copper bulk in naturally aerated 0.1 M NaOH solution. The results might be related to the dissolved oxygen in the medium.

Effect of High-Intensity Pulsed Ion Beam Irradiation on the Electrochemical Corrosion Behavior of AZ31 Magnesium Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 571-574
Author(s):  
Peng Li
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Current Density ◽  
Ion Beam ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Open Circuit ◽  
Electrochemical Corrosion Behavior ◽  
Shot Number

HIPIB irradiation experiment is carried out at a specific ion current density of 1.1 J/cm2 with shot number from one to ten in order to explore the effect of shot number on electrochemical corrosion behavior of magnesium alloy. Surface morphologies, microstructure and corrosion resistance of the irradiated samples are examined by scanning electron microscopy (SEM), transmission electron microscope (TEM) and potentiodynamic polarization technique, respectively. It is found that HIPIB irradiation leads to the increase in open circuit potential, corrosion potential and breakdown potential, and the decrease in the corrosion current density and the corrosion rate as compared to the original sample. The improved corrosion resistance is mainly attributed to the grain refinement and surface purification induced by HIPIB irradiation.

scholarly journals STUDIES ON TENSILE PROPERTIES AT VARIOUS STRAIN RATES AND CORROSION BEHAVIOR OF PEAKAGED AL-6SI-0.5MG (-0.5CU) ALLOYS

2016 ◽  
Vol 17 (2) ◽  
pp. 105-115
Author(s):  
Abul Hossain ◽  
Fahmida Gulshan ◽  
A. S. W. Kurny
Keyword(s):  
Tensile Properties ◽  
Corrosion Behavior ◽  
Open Circuit Potential ◽  
Corrosion Potential ◽  
Electrochemical Corrosion ◽  
Open Circuit ◽  
Strain Rates ◽  
Cu Content ◽  
Electrochemical Corrosion Behavior ◽  
Experimental Strain

This paper focuses the effect of Cu additions on tensile properties of Al-6Si-0.5Mg alloy at various strain rates and electrochemical corrosion behavior. The additions of Cu resulted in an increase in tensile strength and showed higher strength all over the experimental strain rates. Evaluations of tensile properties at the three different strain rates (10-4, 10-3 & 10-2s-1) showed that they affected the tensile properties significantly. The strength was better at higher strain rate but ductility was poor. Eelectrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation have been used to evaluate the corrosion resistance of Cu free and 0.5wt% Cu content Al-6Si-0.5Mg alloy in 0.1M NaCl solution. The 0.5wt% Cu addition to the Al-6Si-0.5Mg alloy showed that Cu decreased susceptibility to corrosion compared to the Cu free Al-6Si-0.5Mg alloy. The magnitude of open circuit potential (OCP), corrosion potential (Ecorr) and pitting corrosion potential (Epit) of Al-6Si-0.5Mg alloy were shifted to the more noble direction due to 0.5wt% Cu addition and thermal modification.

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

Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy

2018 ◽  
Vol 69 (1) ◽  
pp. 86-90 ◽  
Author(s):  
Ioana Arina Gherghescu ◽  
Daniela Ionita ◽  
Sorin Ciuca ◽  
Ruxandra Elena Dumitrescu
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Transformation Temperatures ◽  
Electrochemical Corrosion Behavior

This paper presents some electrochemical impedance spectroscopy research results concerning the corrosion resistance of a shape memory Ni50Ti48Nb2 alloy. This one was previously studied by SEM and DSC [1,2] but some new research features had to be made clear in order to be able to explain its electrochemical corrosion behavior. The chemical composition Ni50Ti48Nb2 was chosen in order to obtain a shape memory alloy having a wider hysteresis than equiatomic NiTi, for the purpose of achieving a better thermomechanical stability. Cryogenic applications are aimed. After processing the cast ingot, two samples, S1 and S2, were further annealed at 800�C/12 h and, respectively, at 900�C/12h. Scanning electron micrographs together with the chemical elements mapping results were obtained. They were related to the previous results concerning the informations on the structure of the different phases found in this NiTiNb alloy: austenite, martensite and secondary phases, as well as some primary compounds [1,2]. Considering the size and shape of the complex precipitate particles of NiTiNb in the two differently heat treated samples, these were found responsible for some changes in the transformation temperatures [3] but the electrochemical corrosion behavior of the alloy seems to be influenced to a lesser extent by the heat treatments. Both samples exhibit good values of corrosion resistance, however S2 shows better values than S1. Thus lower transformation temperatures and a slightly better corrosion resistance make the Ni50Ti48Nb2 alloy annealed at 900�C/12h subsequently submitted to thermal cycling to be the right choice for producing couplings in the cryogenic industry.

scholarly journals Effect of Ca Addition on Corrosion Behavior of Wrought AM60 Magnesium Alloy in Alkaline Solutions

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1172
Author(s):  
Polina Metalnikov ◽  
Guy Ben-Hamu ◽  
Kwang Seon Shin ◽  
Amir Eliezer
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Fuel Efficiency ◽  
Electrochemical Corrosion ◽  
Alkaline Solutions ◽  
Kelvin Probe ◽  
Ca Addition ◽  
Electrochemical Corrosion Behavior

Magnesium (Mg) alloys possess the lowest density among structural materials, and their application in the automotive and aircraft industries might enhance fuel efficiency. The mechanical properties can be improved by the addition of alloying elements. However, since Mg and its alloys are very susceptible to corrosion degradation, it is important to study the effect of these elements on the alloys’ corrosion behavior. In this study, 1 wt% of calcium (Ca) was added to wrought AM60 Mg alloy, and the electrochemical corrosion behavior of the alloys in alkaline solutions with and without Cl− ions was compared. The corrosion behavior was investigated by means of immersion tests, gravimetric measurements and potentiodynamic polarization (PDP); the characteristics of the oxide layer were studied by electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The addition of Ca resulted in precipitation of the ternary aluminum-rich (Mg-Al)2Ca phase. Scanning Kelvin probe force microscope (SKPFM) identified that this phase has a cathodic behavior relative to the α-Mg matrix; hence it can serve as additional sites for initiation of pitting corrosion. As a result, the corrosion resistance of wrought AM60 alloy with 1 wt% Ca addition deteriorated in a NaCl solution. However, in the absence of Cl− ions, alloying with Ca improves the corrosion resistance of wrought AM60 alloy due to the stabilization of the corrosion products layer. The effect of long-period immersion time on the corrosion behavior and alloy oxidation is discussed.

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