Influence of purine on copper behavior in neutral and alkaline sulfate solutions

2012 ◽  
Vol 66 (7) ◽  
Author(s):  
Marija Petrović ◽  
Ana Simonović ◽  
Milan Radovanović ◽  
Snežana Milić ◽  
Milan Antonijević
Keyword(s):  
Potentiodynamic Polarization ◽  
Open Circuit Potential ◽  
Copper Surface ◽  
Open Circuit ◽  
Copper Corrosion ◽  
Solution Ph ◽  
Potential Measurement ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Sulfate Solutions

AbstractThe effect of purine (concentration range of 1.00 × 10−6–1.00 × 10−2 M) on the behavior of copper in a 0.5 M Na2SO4 solution (pH 7 and pH 9) was studied using the open circuit potential measurement, potentiodynamic polarization, and chronoamperometry. Potentiodynamic polarization shows that purine acts as a copper corrosion inhibitor in both alkaline and neutral sulfate solutions. The efficiency of inhibition increases as the purine concentration increases. Chronoamperometric results follow the same trend as the results of potentiodynamic polarization. The inhibition effect can also be observed visually by microscopic examination of the electrode surface. Purine is adsorbed on copper surface according to the Langmuir adsorption isotherm.

scholarly journals Inhibition Effect of Glycerol on the Corrosion of Copper in NaCl Solutions at Different pH Values

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Santos Lorenzo Chi-Ucán ◽  
Andrea Castillo-Atoche ◽  
Pedro Castro Borges ◽  
José Antonio Manzanilla-Cano ◽  
Gerardo González-García ◽  
...  
Keyword(s):  
Open Circuit Potential ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Impedance Analysis ◽  
Inhibitory Effect ◽  
Open Circuit ◽  
Copper Corrosion ◽  
Inhibition Effect ◽  
Ph Values

The inhibitory effect of glycerol on copper corrosion in aerated NaCl (0.5 M) solutions at three pH values (4, 7, and 10) was evaluated. Inhibition efficiency was assessed with conventional electrochemical techniques: open circuit potential, potentiodynamic polarization, and electrochemical impedance analysis. Glycerol reduced the corrosion rate of copper in NaCl solutions. The best inhibition effect (η≈83%) was produced in alkaline (pH 10) chloride media. This effect can be ascribed to increased viscosity and the presence of copper-glycerol complexes.

The Effects of Hydrogen on Properties of Surface Films Formed on Iron in Sulfate Solutions

2014 ◽  
Vol 936 ◽  
pp. 1120-1124 ◽  
Author(s):  
Ahsan Ejaz ◽  
Zhan Peng Lu ◽  
Jun Jie Chen ◽  
Xiao Feng Xia ◽  
Qian Xiao ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Surface Morphology ◽  
Oxide Film ◽  
Open Circuit Potential ◽  
Pure Water ◽  
Open Circuit ◽  
Surface Films ◽  
Concentrated Solutions ◽  
Sulfate Solutions ◽  
Corrosion Of Iron

The effects of charged hydrogen in iron on surface properties of iron in pure water and sodium sulfate solutions of various concentrations were investigsted by open circuit potential monitoring, surface morphology observations, Raman spectroscopy and XRD measurements. Hydrogen in iron shifed the open circuit potential in the negative directions. Hydrogen could change the types of oxide film on iron. Effects of hydrogen on corrosion of iron was More significant in pure water and dilute sodium solutions than those in concentrated solutions.

Forming of Corrosion Inhibitor Film during Turbulent Flow

2011 ◽  
Vol 66-68 ◽  
pp. 540-544 ◽  
Author(s):  
Ahmed Y. Musa ◽  
Abdul Amir H. Kadhum ◽  
Abu Bakar Mohamad ◽  
Mohd Sobri Takriff
Keyword(s):  
Turbulent Flow ◽  
Potentiodynamic Polarization ◽  
Flow Condition ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Steel Corrosion ◽  
Film Structure ◽  
Open Circuit ◽  
Mild Steel Corrosion ◽  
Scanning Electron

The organic material named 4-amino-5-phenyl-4H-1, 2, 4-trizole-3-thiol (APTT) was studied as inhibitor for mild steel corrosion in 1.0 M HCl at 30 °C. The effects of turbulent flow on the inhibition process were characterized using open circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Turbulent flow condition experiments were simulated by Rotating Cylinder Electrode (RCE). Results obtained from changes of open circuit potential (OCP) with immersion time, potentiodynamic polarization, and impedance measurements all are in good agreement and indicated that the formation and the development of the inhibitor film were flow rate dependence. The scanning electron micrograph confirmed film structure is dependence of flow condition.

scholarly journals Influence of gelatin on corrosion behavior of copper in acid media

2012 ◽  
Vol 66 (2) ◽  
pp. 193-200
Author(s):  
Dragisa Todorovic ◽  
Dragan Milenkovic ◽  
Milutin Milosavljevic ◽  
Dragan Markovic
Keyword(s):  
Adsorption Isotherm ◽  
Corrosion Protection ◽  
Inhibitory Action ◽  
Corrosion Current ◽  
Copper Surface ◽  
Langmuir Adsorption Isotherm ◽  
Copper Corrosion ◽  
Citric Acid Solution ◽  
Acid Media ◽  
Langmuir Adsorption

This paper presents the results of gelatin and benzotriazole (BTA) inhibitory action on copper in the acid medium by the method of weight loss. The investigation was carried out in the citric acid solution (1, 5 and 20%) at the temperature of 293 K. Under such conditions, the gelatin showed higher efficiency of corrosion protection in comparison to BTA. The results, obtained through the Gibbs and Langmuir adsorption isotherm, show that gelatin adsorption on copper surface obey the Langmuir adsorption isotherm model, as well as that the adsorption is a spontaneous process. The polarization measurements show the potential of full passivation shift towards more negative values, and the increase of corrosion current in both cases but being more pronounced with the BTA. The results obtained in this paper indicate that the inhibition gelatin can be used as the BTA substitute for the copper corrosion protection.

scholarly journals SYNTHESIS AND EVALUATION OF ETHYL (4-(N-(THIAZOL-2-YL) SULFAMOYL) PHENYL)CARBAMATE (TSPC) AS A CORROSION INHIBITOR FOR MILD STEEL IN 0.1M HCL

2016 ◽  
Vol 11 (2) ◽  
pp. 3441-3451 ◽  
Author(s):  
A. M. El-Shamy ◽  
M. F. Shehata ◽  
Samir T. Gaballah ◽  
Eman A. Elhefny
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Room Temperature ◽  
Open Circuit Potential ◽  
Inhibition Efficiency ◽  
Electrochemical Techniques ◽  
Open Circuit ◽  
Free Energy Of Adsorption ◽  
Langmuir Adsorption ◽  
Gibb’S Free Energy

Laboratory synthesized ethyl (4-(N-(thiazol-2-yl)sulfamoyl)phenyl)carbamate (TSPC), characterized by 1H NMR spectroscopy, was evaluated as corrosion inhibitor of mild steel in 0.1M HCl using electrochemical techniques. Open circuit potential, potentiodynamic polarization and impedance spectroscopy were used to evaluate the inhibition efficiency of (TSPC) at various concentrations. The obtained electrochemical data indicated that (TSPC) acts as moderate corrosion inhibitor for mild steel in acidic media. It is found that the inhibition efficiency increases with the concentration of the inhibitor till 400ppm. The adsorption isotherm involving physisorption of (TSPC) at room temperature and the experimental data complied to the Langmuir adsorption isotherms and the negative values of the Gibb’s free energy of adsorption obtained suggested that inhibitor molecules have been spontaneously adsorbed onto the mild steel surface.

Corrosion Behavior of Sealed Films on Anodized Al Alloy

2011 ◽  
Vol 233-235 ◽  
pp. 1498-1501
Author(s):  
Qi Zhou ◽  
Chun Lin He ◽  
Qing Kui Cai
Keyword(s):  
Potentiodynamic Polarization ◽  
Open Circuit Potential ◽  
Corrosion Behaviour ◽  
Sol Gel ◽  
Open Circuit ◽  
Green Technology ◽  
Al Alloy ◽  
Corrosion Mechanism ◽  
Pitting Potential ◽  
Corrosive Solution

Alumina sol sealing is one of new green technology for anodized Al alloy. The corrosion mechanism of films sealed by sol and corrosion behaviour of films sealed by sol, Na2Cr2O7, boiling water were analyzed by their curves of open circuit voltage-time (E-T) and potentiodynamic polarization curve. It is found that corrosion tendency of sol sealing film is less than other sealed films by E-T inspection. Fluctuation of open-circuit potential is furious in the immersing prophase and slows down in the anaphase for anodized sealed films. At this time corrosive reactions gradually reach steady state. Open-circuit potential greatly waves for the rough sealed films. Potentiodynamic polarization curves of sealed films show that passive area is the longest for films sealed by sol which has the minimum corrosive current , the passivate current, anodic current and cathode current, but the maximum pitting potential and open-circuit potential. Corrosion parameters are the second for the film sealed by dichromate. Anodic reactions are strongly inhibited by sol sealing films in Cl- corrosive solution. Sol sealing films weaken cathode O2 depolarize reaction. Cl- ions erode anodized Al material on which covered with sol film and produce corrosion. The corrosion of sol-gel film goes through two periods: pitting induced phase and pitting corrosion period.

Copper corrosion behaviour in acidic sulphate media in the presence of 5-methyl-1H-benzotriazole and 5-chloro-1H-benzotriazole

2015 ◽  
Vol 0 (0) ◽  
Author(s):  
Zaklina Z. Tasic ◽  
Milan M. Antonijevic
Keyword(s):  
Mass Loss ◽  
Acidic Medium ◽  
Open Circuit Potential ◽  
Corrosion Behaviour ◽  
Open Circuit ◽  
Chloride Ions ◽  
Copper Corrosion ◽  
Potentiodynamic Polarisation ◽  
Sulphate Media ◽  
Acidic Sulphate

AbstractThe influence of 1H-benzotriazole, 5-methyl-1H-benzotriazole and 5-chloro-1H-benzotriazole on copper corrosion in an acidic sulphate medium was studied, as well as the influence of chloride ions on the corrosion behaviour of copper. The methods used were potentiodynamic measurements, open circuit potential and mass loss. The results show that the examined compounds possess good inhibitory properties in an acidic medium. The potentiodynamic polarisation results indicate that the degree of copper protection against corrosion depends on the concentration of Cl

scholarly journals Reduced graphene oxide-polyaniline film as enhanced sensing interface for the detection of loop-mediated-isothermal-amplification products by open circuit potential measurement

RSC Advances ◽  
2018 ◽  
Vol 8 (45) ◽  
pp. 25361-25367 ◽  
Author(s):  
Vu Thi Thu ◽  
Bui Quang Tien ◽  
Dau Thi Ngoc Nga ◽  
Ly Cong Thanh ◽  
Le Hoang Sinh ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Open Circuit Potential ◽  
Open Circuit ◽  
Isothermal Amplification ◽  
Potential Measurement ◽  
Polyaniline Film ◽  
Loop Mediated Isothermal Amplification ◽  
Disposable Sensor ◽  
Reduced Graphene

A novel disposable sensor based on reduced graphene oxide-polyaniline (rGO-PANi) for detection of loop-mediated-isothermal-amplification (LAMP) products.

scholarly journals Pyrite Passivation by Triethylenetetramine: An Electrochemical Study

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Yun Liu ◽  
Zhi Dang ◽  
Yin Xu ◽  
Tianyuan Xu
Keyword(s):  
Cyclic Voltammetry ◽  
Potentiodynamic Polarization ◽  
Mixed Type ◽  
Open Circuit Potential ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Experimental Results ◽  
Coating Agent ◽  
Mixed Type Inhibitor

The potential of triethylenetetramine (TETA) to inhibit the oxidation of pyrite in H2SO4solution had been investigated by using the open-circuit potential (OCP), cyclic voltammetry (CV), potentiodynamic polarization, and electrochemical impedance (EIS), respectively. Experimental results indicate that TETA is an efficient coating agent in preventing the oxidation of pyrite and that the inhibition efficiency is more pronounced with the increase of TETA. The data from potentiodynamic polarization show that the inhibition efficiency (η%) increases from 42.08% to 80.98% with the concentration of TETA increasing from 1% to 5%. These results are consistent with the measurement of EIS (43.09% to 82.55%). The information obtained from potentiodynamic polarization also displays that the TETA is a kind of mixed type inhibitor.

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