Electrochemical impedance spectroscopy as a monitoring tool for passivation and localized Corrosion of aluminum alloys

Mansfeld, F.; Lin, Shan; Kim, S.; Shih, H.

doi:10.1002/maco.19880391102

Cited by 62 publications

(36 citation statements)

References 11 publications

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“…However, the decrease in the size of the semicircle for mc-Al compared to pc-Al indicates that mc-Al is more susceptible to corrosion in the acidic environment. The Nquist plots are characterized by three time constants consisting a large capacitive loop at high frequencies (HF), an inductive loop at medium frequencies (MF) followed by the second capacitive loop at low [15,17,18] since the oxide film is considered to be a parallel circuit of a resistor due to the ionic conduction of the oxide film and a capacitor due to its dielectric properties [18]. Another possible explanation for the origin of the capacitive loop at high frequency as put forward by Brett [19] and reported in [20] is the reactions involved in the formation of the oxide layer.…”

Section: Eis Measurementsmentioning

confidence: 99%

Effect of aluminium microstructure on corrosion and inhibiting effect of polyacrylic acid in H2SO4 solution

Umoren

Wang

2010

J Appl Electrochem

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The corrosion behaviour of a microcrystalline aluminium (mc-Al) coating fabricated from pure cast aluminium substrate by magnetron sputtering and the pure polycrystalline aluminium (pc-Al) were studied using electrochemical impedance spectroscopy and potentiodynamic polarization techniques in aerated 0.5 M H 2 SO 4 at 30 ± 1°C. The corrosion inhibiting effect of polyacrylic acid (PAA) and synergistic effect of iodide ions was also investigated. Results obtained show that surface microcrystallization increases the corrosion susceptibility of pure cast aluminium leading to decrease in interfacial impedance and an increase in the kinetics of the anodic dissolution. Introduction of PAA into the corrosive medium was observed to retard the corrosion rates of both specimens. The inhibition mechanism was affected by the microstructure of the sample. PAA functions as a mixed inhibitor but under cathodic control for pc-Al and under anodic control for mc-Al. Addition of iodide ions synergistically increased the inhibition efficiency of PAA and this effect was more pronounced with mc-Al.

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Section: Eis Measurementsmentioning

confidence: 99%

Effect of aluminium microstructure on corrosion and inhibiting effect of polyacrylic acid in H2SO4 solution

Umoren

Wang

2010

J Appl Electrochem

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“…1a). The capacitive loop (at high frequencies) could be assigned to the relaxation process in the natural oxide presents on the surface of the aluminum sample and its dielectric properties 17,19 . Namely, the oxide film is considered to be a parallel circuit of a resistor due to the ionic conduction in the oxide film, and a capacitor due to its dielectric properties.…”

Section: Methodsmentioning

confidence: 99%

“…e-mail: f-baghaei@mail.uk.ac.ir The inductive loop (at low frequencies) could be attributed to the relaxation process in oxide presents on the electrode surface and it is obtained by adsorption species as ( ads and 19 . These data are consistent with mechanism that proposed the adsorption of SO 4 2-ions on to the oxide surface forming oxide-sulfate aluminum in acidic solutions.…”

Section: Ac Impedancementioning

confidence: 99%

Synergistic Influence of Propargyl Alcohol and Zinc Sulfate on Inhibition of Corrosion of Aluminum in 0.5M H2so4

Ravari

Dadgareenezhad

2013

J. Chil. Chem. Soc.

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This paper describes the use of the Tafel polarization and electrochemical impedance spectroscopy technique (EIS) in order to study the corrosion inhibition process of aluminum in 0.5M H 2 SO 4 solution in presence of propargyl alcohol and zinc sulfate at the open circuit potential (OCP) in the room temperature. The Nyquist diagrams consisted of a capacitive semicircle at high frequencies followed by a well defined inductive loop at low frequency values. The impedance measurements were interpreted according to a suitable equivalent circuit. The results obtained showed that the addition of the propargyl alcohol inhibits the sulfuric acid corrosion of the aluminum. The inhibition efficiency increases with an increase in the propargyl alcohol concentration. The inhibition occurs through adsorption of the propargyl alcohol on the metal surface without modifying the mechanism of corrosion process. The inhibiting action propargyl alcohol is considerably enhanced by addition of zinc sulfate. Both the inhibitors obeyed the Langmuir isotherm and the thermodynamic calculations revealed that the adsorption of inhibitors was of physical nature.Keywords: Electrochemical Techniques; Corrosion; Aluminum; Zinc Sulfate; INTRODUCTIONAluminum and its alloys find a wide spread spectrum of technological applications because of their particular properties such as low density, good appearance and corrosion resistance. For these reasons, the corrosion behavior of these materials has attracted the attention of several investigators. Acid solutions are used for pickling, chemical and electrochemical etching of aluminum and its alloys. It is very important to add a corrosion inhibitor to decrease the corrosion rate of aluminum and its alloys in such solutions. Several authors [1][2][3][4] have studied the corrosion of aluminum and its alloys and their inhibition by organic inhibitors in acid solutions. The result of the investigations shows that acetylenic compounds are very effective in corrosion inhibition of metal in acid media [5]. Propargyl alcohol (PA) (2-propyn-1-ol) is one of the acetylenic alcohols and its inhibition effect has been discussed extensively [5][6][7][8][9][10] . The decisive role of the triple bonds of the PA molecule due to the π-electrons interacting with the metallic surfaces is generally accepted [11][12][13][14][15] . The adsorption of the inhibitor on the metal surface can markedly change the corrosion-resisting property of the metal 6,7 . The application of electrochemical impedance spectroscopy technique (EIS) as a new tool in corrosion research has resulted in a wealth of information concerning the methods of corrosion protection which were difficult to study with traditional dc techniques. This includes corrosion protection by conversion coatings 8 , polymer coating, and anodic films 9 . EIS has also provided information concerning corrosion protection by inhibitors 10 . In addition to specification of the physical properties of the system, the technique leads to important mechanistic and kinetic i...

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“…Deviation of this kind is referred to as frequency dispersion, and has been attributed to inhomogeneities of the solid surfaces. 56 Mansfeld et al 47,48 have suggested an exponent n in the impedance function as a deviation parameter from the ideal behavior. By this suggestion, the capacitor in the equivalent circuit can be replaced by the so-called constant phase element (CPE), which is a frequencydependent element and related to surface roughness.…”

Section: Electrochemical Impedance Spectroscopy (Eis) Studiesmentioning

confidence: 98%

“…47,48 The oxide film is considered to be a parallel circuit of a resistor due to the ionic conduction in the oxide film and a capacitor due to its dielectric properties. The capacitive loop is corresponding to the interfacial reactions, particularly, the reaction of aluminum oxidation at the metal/oxide/electrolyte interface.…”

Section: Electrochemical Impedance Spectroscopy (Eis) Studiesmentioning

confidence: 99%

3-Methyl-4-amino-5-mercapto-1,2,4-triazole as corrosion inhibitor for 6061 Al alloy in 0.5 M sodium hydroxide solution

2011

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3-Methyl-4-amino-5-mercapto-1,2,4-triazole (MAMT) was synthesized, and its inhibition action on the corrosion of 6061 Al alloy in 0.5 M sodium hydroxide was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The effect of inhibitor concentration, temperature, and concentration of the corrosion medium on the inhibitor action was investigated. The surface morphology of the metal surface was investigated by scanning electron microscopy (SEM). The inhibition efficiency increased with the increase in the concentration of the inhibitor, but decreased with the increase in temperature. Both thermodynamic and kinetic parameters were calculated and discussed. The adsorption of MAMT on the base alloy was found to be through physisorption, obeying Langmuir's adsorption isotherm. The results obtained from both the techniques were in good agreement with each other.

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Electrochemical impedance spectroscopy as a monitoring tool for passivation and localized Corrosion of aluminum alloys

Cited by 62 publications

References 11 publications

Effect of aluminium microstructure on corrosion and inhibiting effect of polyacrylic acid in H2SO4 solution

Effect of aluminium microstructure on corrosion and inhibiting effect of polyacrylic acid in H2SO4 solution

Synergistic Influence of Propargyl Alcohol and Zinc Sulfate on Inhibition of Corrosion of Aluminum in 0.5M H2so4

3-Methyl-4-amino-5-mercapto-1,2,4-triazole as corrosion inhibitor for 6061 Al alloy in 0.5 M sodium hydroxide solution

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