scholarly journals Anti-tarnish silver alloys in system Ag-Cu-Zn-Si with the addition of aluminum

10.30544/386 ◽  
2018 ◽  
Vol 24 (3) ◽  
pp. 181-188
Author(s):  
Marija Korać ◽  
Stevan Dimitrijević ◽  
Kemal Delijić ◽  
Željko Kamberović
Keyword(s):  
Linear Polarization ◽  
Polarization Resistance ◽  
Open Circuit Potential ◽  
Sodium Sulfide ◽  
Open Circuit ◽  
Silver Alloys ◽  
Linear Polarization Resistance ◽  
Sodium Sulfide Solution ◽  
Sulfide Solution ◽  
Polarization Resistance Method

This paper presents investigations of aluminum addition influence on the corrosion characteristics of the sterling silver Ag-Cu-Zn-Si alloys. The procedure for obtaining Ag-Cu-Zn-Al-Si alloys in small ranges of predefined composition was also presented. Open circuit potential measurements, linear polarization resistance method and potentiodynamic polarization tests were employed to determine corrosion characteristics of the alloys. The materials were tested in a 0.01M sodium sulfide solution. It was shown that the addition of aluminum improves sulfidization resistance and corrosion characteristics. Best results are achieved for the alloy with the following composition 92.5% Ag, 1.9% Cu, 3.7% Zn, 1.6% Al and 0.3% Si.

scholarly journals Design of anti-tarnish sterling silver Ag-Cu-Zn alloy and investigation of silicon addition influence on mechanical and corrosion characteristics

2018 ◽  
Vol 24 (3) ◽  
pp. 267-274
Author(s):  
Stevan Dimitrijevic ◽  
Vladimir Parezanin ◽  
Zeljko Kamberovic ◽  
Milisav Ranitovic ◽  
Marija Korac ◽  
...  
Keyword(s):  
Open Circuit Potential ◽  
Sodium Sulfide ◽  
Open Circuit ◽  
Electrochemical Tests ◽  
Linear Polarization Resistance ◽  
Silicon Addition ◽  
Hardness Tests ◽  
Zn Alloy ◽  
Zn Alloys ◽  
Polarization Resistance Method

This paper presents investigations of the influence of silicon addition on the mechanical and corrosion characteristics of the sterling silver Ag-Cu-Zn alloys. The procedure for obtaining Ag-Cu-Zn-Si alloys in small ranges of composition was also presented. Vickers hardness tests and three electrochemical tests were performed on the samples in this study. Open circuit potential measurements, linear polarization resistance method, and potentiodynamic polarization tests were employed to determine corrosion characteristics of the alloys. The materials were tested in 0.9% NaCl solution, artificial sweat, 0.1 and 0.01 M sodium sulfide solutions. It was shown that addition of silicone increases hardness and generally improves sulfidation resistance and corrosion characteristics in near-neutral chloride solutions of the Ag-Cu-Zn alloys.

Improvement of the linear polarization resistance method for testing steel corrosion inhibitors

2016 ◽  
Vol 2016 (11) ◽  
pp. 1035-1041 ◽  
Author(s):  
A. T. Faritov ◽  
Yu. G. Rozhdestvenskii ◽  
S. A. Yamshchikova ◽  
E. R. Minnikhanova ◽  
A. S. Tyusenkov
Keyword(s):  
Linear Polarization ◽  
Polarization Resistance ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Resistance Method ◽  
Linear Polarization Resistance ◽  
Polarization Resistance Method

scholarly journals Evaluación mecánica de concreto y de corrosión en mortero con partículas de neumático reciclado

2013 ◽  
Vol 3 (3) ◽  
pp. 188-199
Author(s):  
C. Flores ◽  
S. Rodríguez ◽  
A. Cárdenas ◽  
O. Guarneros
Keyword(s):  
Mechanical Properties ◽  
Corrosion Rate ◽  
Compression Strength ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Corrosion Potential ◽  
Hardened Concrete ◽  
Scrap Tire ◽  
Linear Polarization Resistance ◽  
Polarization Resistance Method

RESUMENSe estudió la factibilidad del uso de partículas de neumático reciclado en concreto y morteros. Para evaluar las propiedades mecánicas del concreto endurecido se realizaron pruebas de densidad, resistencia a la compresión y determinación del módulo de elasticidad. Además se determinó la trabajabilidad del concreto en estado fresco mediante la prueba de revenimiento Las muestras se fabricaron con la sustitución de un 5%, 7.5% y 10 % del volumen de la arena por partículas de neumático reciclado. Se determinó mediante la técnica de potencial de corrosión el estado que guardaba en acero revisando de esta manera la probabilidad de corrosión. Para el estudio de la velocidad de corrosión se utilizó la técnica electroquímica de resistencia a la polarización lineal (RPL) en morteros fabricados bajo las mismas condiciones y proporciones que en los concretos. Los resultados mostraron que una mezcla con 7.5% de partículas de neumático reciclado puede ser utilizada en estructuras de resistencia moderada, ligera y ubicadas en ambientes con cloruros.Palabras clave: Concreto; mortero; neumático reciclado; velocidad de corrosión; Propiedades mecánicas.ABSTRACTThe feasibility of using scrap tire particles in the elaboration of concrete and mortar was investigated. To assess the mechanical properties of hardened concrete, tests evaluating of its density, modulus elasticity and compression strength were undertaken. To determine the workability of freshly made concrete, a slump test was also performed. Tests in which 5, 7.5 and 10% of sand were substituted by recycled tire particles were made. The likelihood of corrosion on the steel is determined, using the technique of corrosion potential. To test the velocity of corrosion was used the linear polarization resistance method (LPR method) was utilized under the same conditions as well as fabrication of concrete. It was observed that using 7.5% of recycled tire particles offers satisfactory results in structures of moderate strength and lighter weight located in environments with chlorides.Keywords: Concrete; mortar; recycled tire; corrosion rate; mechanical properties.

scholarly journals Study on Corrosion of Macroporous Silicon in Sodium Hydroxide Solution by Electrochemical Methods and Scanning Electron Microscopy

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Chuan Lai ◽  
Zhen Xiang ◽  
Changlu Liu ◽  
Chaoju Zhu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Corrosion Current Density ◽  
Corrosion Current ◽  
Open Circuit ◽  
Macroporous Silicon ◽  
Linear Polarization Resistance ◽  
Scanning Electron

The fabricated macroporous silicon with a porosity of 26.33% corrosion in NaOH solution was systemically investigated by open circuit potential measurements, linear polarization measurements, potentiodynamic polarization measurements, and scanning electron microscopy, respectively. Results show that the potential open circuit and linear polarization resistance decreases with the NaOH concentration increasing. The corrosion potential shifts significantly to more negative potentials and corrosion current density increases with NaOH concentration increasing. Adding ethanol to 1.0 M NaOH can lead to the linear polarization resistance decrease, corrosion potentials shift in the positive direction, and corrosion current density increase. In addition, the scanning electron microscopy images demonstrate that the macroporous silicon samples are seriously damaged by 1.0 M NaOH and 1.0 M NaOH/EtOH (30%).

scholarly journals Electrochemical Performance of Ti-Based Commercial Biomaterials

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
E. Porcayo-Palafox ◽  
S. I. Carrera-Chavez ◽  
S. R. Casolco ◽  
J. Porcayo-Calderon ◽  
V. M. Salinas-Bravo
Keyword(s):  
Polarization Resistance ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Titanium Implants ◽  
Nacl Solution ◽  
Linear Polarization Resistance ◽  
Potentiodynamic Polarization Curves ◽  
Commercially Pure ◽  
Thermomechanical Processes

In order to determine the electrochemical behavior against the corrosion of different commercial biomaterials, in this study the results of the evaluation of different titanium implants are reported. The commercial implants evaluated were purchased randomly with different suppliers. The different biomaterials were subjected to studies of potentiodynamic polarization curves, open circuit potential measurements, linear polarization resistance measurements, and electrochemical impedance spectroscopy measurements in a 0.9% NaCl solution. The results showed that the chemical composition of the biomaterials corresponds to commercially pure Ti or to the alloy Ti6Al4V. In addition, although all the biomaterials showed a high resistance to corrosion, notable differences were observed in their performance. These differences were associated with the thermomechanical processes during the manufacture of the biomaterial, which affected its microstructure.

Corrosion Behavior of Galvanized Steel in Simulated Rain

2011 ◽  
Vol 374-377 ◽  
pp. 1567-1570
Author(s):  
Xing Wen Zheng ◽  
Min Gong ◽  
Xian Guang Zeng
Keyword(s):  
Corrosion Behavior ◽  
Polarization Resistance ◽  
Open Circuit Potential ◽  
Ph Value ◽  
Corrosion Current ◽  
Open Circuit ◽  
Galvanized Steel ◽  
Linear Polarization Resistance ◽  
Zinc Carbonate ◽  
Simulated Rain

This paper investigates the corrosion behavior of galvanized steel in simulated rain using electrochemical method and surface analysis. The results indicate that the open circuit potential (OCP) for galvanized steel in simulated rain tends to be stable at -1.122V (SCE). With the increase of pH value, the corrosion current density (Icorr) for galvanized steel in simulated rain decreases initially and increases afterwards. Contrary to Icorr, the linear polarization resistance (Rp) for galvanized steel in simulated rain increases first and then declines. When pH value equals to 8.00, Icorr arrives at the minimum value whereas Rp reaches to its maximum. The findings also demonstrate that serious corrosion occurred on the surface of galvanized steel after immersing in simulated rain, besides, local corrosion was also observed, and the corrosion products are mainly zinc carbonate.

Error Estimation of Linear Polarization Resistance Measurement Caused by IR Drop for Reinforcement Corrosion in Concrete

2016 ◽  
Vol 866 ◽  
pp. 14-19
Author(s):  
Jin Xia Xu ◽  
Ya Long Cao ◽  
Lin Hua Jiang ◽  
Ying Bin Song ◽  
Wei Feng
Keyword(s):  
Linear Polarization ◽  
Polarization Resistance ◽  
Chloride Content ◽  
Chloride Ions ◽  
Resistance Measurement ◽  
Reinforcing Steel ◽  
Error Level ◽  
Corrosion Condition ◽  
Linear Polarization Resistance ◽  
Ir Drop

In order to evaluate more accurately the corrosion condition of reinforcing steel in chloride contaminated concrete, it is significant to investigate the error level in the linear polarization resistance measurement caused by IR drop. Concretes with eight levels of chloride ions (ranging from 0% to 2.0% by mass of cement) by adding different amounts of sodium chloride in the mixing water were prepared. Linear polarization measurements with and without IR compensation, were applied to determine the error level. Besides, half-cell potential method was employed to detect the corrosion condition of reinforcing steel. The results indicate that the error level is so low (less than 5.0%) that the IR drop can be negligible when the chloride content is relatively lower (0.6% or less by mass of cement). However, the error level is increased with the increase of chloride content. The IR drop is suggested to be compensated when the chloride content is relatively higher (more than 0.6% by mass of cement). At this time, the onset of active corrosion of reinforcing steel is also found.

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