Linear Polarization Resistance and Open Circuit Potential Studies for the Corrosion Behavior of Ni3(Si,Ti) + 4Al Intermetallic Compound in NaCl Solutions

2017 ◽  
Vol 23 (6) ◽  
pp. 5759-5761 ◽  
Author(s):  
Gadang Priyotomo ◽  
Yasuyuki Kaneno
Keyword(s):  
Intermetallic Compound ◽  
Corrosion Behavior ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Open Circuit Potential ◽  
Open Circuit ◽  
Linear Polarization Resistance

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.

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.

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.

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.

A Lifetime of Metallic Nanoparticles in Heat Exchange Liquids

2014 ◽  
Vol 811 ◽  
pp. 23-27 ◽  
Author(s):  
Jan Stoulil ◽  
Tomáš Pfeifer ◽  
Alena Michalcová ◽  
Ivo Marek
Keyword(s):  
Aqueous Solution ◽  
Heat Exchange ◽  
Mass Loss ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Metallic Nanoparticles ◽  
Iron Nanoparticles ◽  
Corrosion Prevention ◽  
Linear Polarization Resistance ◽  
Formate Solution

This work is focused on lifetime prediction of metallic nanoparticles in heat exchange nanofluids. Copper, nickel and iron nanoparticles were studied in 40 wt.% aqueous solution of potassium formate and propylene glycol. Materials were observed by means of mass loss exposure tests, linear polarization resistance and potentiodynamic measurements. Potassium formate solution is not suitable bearing liquid for metallic nanoparticles. Propylyne glycol seems promising, however additional corrosion prevention needs to be applied.

Prediction and Measurement of Corrosion Rates of Stainless Steel in Concentrated Sulfuric Acid

CORROSION ◽  
10.5006/0709 ◽  
2013 ◽  
Vol 69 (6) ◽  
pp. 543-550 ◽  
Author(s):  
S. Jones ◽  
K. Coley ◽  
J. Kish
Keyword(s):  
Stainless Steel ◽  
Sulfuric Acid ◽  
Corrosion Behavior ◽  
Electrochemical Behavior ◽  
Open Circuit Potential ◽  
Electrochemical Techniques ◽  
Open Circuit ◽  
Corrosion Rates ◽  
Transient Nature ◽  
Concentrated Sulfuric Acid

When exposed to concentrated sulfuric acid, stainless steel exhibits unique electrochemical behavior. This behavior can be observed as an oscillation in open-circuit potential between the active and passive states. The transient nature of the corrosion behavior under these conditions results in a distinct challenge for measuring and predicting corrosion rates. Using a series of commercial alloys with various nickel contents, this paper outlines the utilization of electrochemical experimentation to refine the prediction of corrosion rates. The paper also discusses some of the difficulties associated with many traditional electrochemical techniques such as potentiodynamic scans when used for characterizing systems that undergo oscillations in open-circuit potential.

Electrochemical Investigation of the Effects of Acid Concentration and Dissolved Oxygen on the Corrosion Behavior of Austenitic Low-Nickel Stainless Steels in Citric Acid

2016 ◽  
Vol 835 ◽  
pp. 115-120
Author(s):  
Francis Mulimbayan ◽  
Manolo G. Mena
Keyword(s):  
Corrosion Resistance ◽  
Citric Acid ◽  
Dissolved Oxygen ◽  
Corrosion Behavior ◽  
Polarization Resistance ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Open Circuit ◽  
Human Consumption ◽  
Face Centered Cubic

All materials which are intended to have in contact with food and other commodities produced or processed for human consumption are called food contact materials (FCM’s). Stainless steel (SS) – a widely known metallic FCM is used mainly in processing equipment, containers and household utensils. It is known for having numerous industrial and domestic applications worldwide due to its special characteristics of having notable corrosion resistance. However, this corrosion resistance is not all-encompassing since SS may still undergo degradation when subjected to a specific corrosion-inducing environment. SS may be classified according to its microstructure. If the atoms which make up the SS can be viewed as having a face-centered cubic structure, then the alloy is said to be austenitic. This SS grades include the conventional 300-series and the newly-developed 200-series. The former has superior corrosion resistance while the latter is far cheaper. In this study, the corrosion behavior of AISI 202 SS in two different levels of dissolved oxygen (O2) and three acid concentrations was investigated using electrochemical techniques, namely, open-circuit potential (OCP) measurements and electrochemical impedance spectroscopy (EIS). As the concentration of citric acid is increased, the measured OCP values of the alloy decreased and the polarization resistance (Rp) decreased, indicating decrease in alloy stability and decline in the corrosion resistance, respectively. With regards to effects of dissolved O2, results revealed that increasing the level of dissolved O2 has consequently increased the polarization resistance and shifted the OCP to more positive values. All the generated Nyquist plots exhibited a depressed capacitive loops indicating that corrosion in the designated solution occurred with charge transfer as the rate-determining step.

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