In-situ monitoring of pitting corrosion of copper alloys by holographic interferometry

Habib, K.

doi:10.1016/s0010-938x(98)00049-3

Cited by 45 publications

(16 citation statements)

References 2 publications

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“…The cathodic and anodic current densities were measured electromagnetically by the optical transducer, rather than electronically by one of the classical methods, i.e., an Ammeter, of measuring the flow of the electronic current in a conductor. In addition, the optical transducer was applied to measure uniform corrosion and localized corrosion on metal surfaces and on substrates covered by organic coatings or under crevice assemblies [8][9][10][11][12][13][14]. The optical transducer was also used to document adsorption and desorption phenomena of chemical species on metal surfaces in aqueous solutions [12].…”

Section: Introductionmentioning

confidence: 99%

DL capacitance–emission spectroscopy of determining the electrochemical behavior of anodized aluminum in aqueous solutions

Habib¹

2009

Optik

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Section: Introductionmentioning

confidence: 99%

DL capacitance–emission spectroscopy of determining the electrochemical behavior of anodized aluminum in aqueous solutions

Habib¹

2009

Optik

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“…(1) can be used to determine the corrosion current density of a metallic substrate coated with an organic film as long as the solution can penetrate through the organic film causing uniform (such as rust) or localized (such as crevice) corrosion under the organic film. In fact, the way of the fringes form and the spacing between the fringes in interferograms determine whether the corrosion of the metallic substrate (under the coating) is localized or uniform [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…perforation of the surface) will cause a potential drop and a current rise at the same time, and the repassivation of passive film (repassivation of crevice corrosion) will cause the potential to increase and the current to decrease. Therefore, a new parameter called the corrosion admittance, Ac, is defined as follows to reflect localized corrosion, passivation or repassivation, and uniform corrosion, [11,12]:…”

Section: Introductionmentioning

confidence: 99%

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Modified electrochemical emission spectroscopy (MEES) of detection of crevice corrosion of metallic alloys

Habib¹

2002

Nondestructive Testing and Evaluation

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An early stage of crevice corrosion of an epoxy coated sample of a pure aluminium, a stainless steel and a low carbon steel in 1 M KCl, 1 M NaCl and 1 M NaOH solutions, respectively, was investigated in situ by a new method. The new method of crevice corrosion detection is based on the optical corrosion-meter for measuring the corrosion current density (J ) and on a modified electrochemical noise technique for determining the corrosion admittance (Ac) at the open circuit potential of the alloys in solutions. The observations of crevice corrosion were basically interferometric perturbations detected by the optical corrosion-meter only on the coated steel and the stainless steel samples in 1 M NaOH and 1 M NaCl solutions, respectively.The interferometric perturbations interpreted as localized corrosion underneath the coating in a form of an early crevice corrosion, of a depth ranged between 0.3 mm to several micrometers. Also, the early stage of crevice corrosion of the same alloys in same solutions was determined in situ by a modified electrochemical noise (EN) technique, called the modified electrochemical emission spectroscopy (MEES) technique, simultaneously during the optical interferometry measurements. Determinations of crevice corrosion by the MEES technique were electrochemical noise spectra detected on corrosion admittance (Ac)-time plots of the alloys in solutions. The corrosion admittance parameter, Ac ¼ ðdJ=dVÞ; which defined the MEES technique, is capable of indicating localized corrosion activities. In this investigation, the parameter Ac was modified in which the change of the corrosion current density (dJ ) was measured by the optical corrosion-meter rather than by the zero resistance ammeter, which is normally used for measuring the dJ in electrochemical noise technique. Results of the present work indicate that optical corrosion-meter as an electromagnetic method of measuring the corrosion current density and MEES technique, as an electronic method for determining Ac, are useful techniques as non-destructive methods for detection of crevice corrosion at the initiation stage of the phenomenon.

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“…One of the disadvantages of using electronic instruments for the measurement of electrochemical properties is the invasive nature of those instruments to the electrochemical systems of the metallic electrodes in aqueous solutions. In recent works published elsewhere [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], it has been shown that laser optical interferometry can be used as an optical transducer to characterize the electromagnetic field, i.e. phase and amplitude of the reflected light waves of a surface of a metallic electrode moving further away from the light source, which develops as a result of the electron conduction in metallic electrodes in aqueous solutions due to the anodic reaction, corrosion processes, between the electrodes and the aqueous solutions.…”

mentioning

confidence: 99%

Laser optical interferometry as a zero resistance ammeter: fundamental and applications

Habib¹

2003

Nondestructive Testing and Evaluation

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It is well known that electronics instrumentation, i.e. Ammeter, Potential-meter, have been used for years to measure electrochemical properties of metallic electrodes in aqueous solutions. One of the disadvantages of using electronic instruments for the measurement of electrochemical properties is the invasive nature of those instruments to the electrochemical systems of the metallic electrodes in aqueous solutions. In recent works published elsewhere [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], it has been shown that laser optical interferometry can be used as an optical transducer to characterize the electromagnetic field, i.e. phase and amplitude of the reflected light waves of a surface of a metallic electrode moving further away from the light source, which develops as a result of the electron conduction in metallic electrodes in aqueous solutions due to the anodic reaction, corrosion processes, between the electrodes and the aqueous solutions. The characterization of such electromagnetic field ( phase and amplitude of the reflected light waves of a surface) and a mathematical correlation of the electromagnetic field to any electrochemical properties, i.e. corrosion current density, double layer capacitance, alternating current impedance, and so on, would lead to the measurement of the electrochemical properties by optical interferometry, by the non-invasive method. In the present work, the corrosion current density of a pure Copper (99.8% Cu), an Aluminum-Brass alloy (76% Cu, 22% Ni, and 2% Al), and a Stainless steel (UNS No.304 Stainless steel, 19% Cr, 9% Ni, 0.45% Mn, and rest Fe) were obtained in natural seawater, respectively. Also, the corrosion current density of the same Stainless steel (UNS No.304 stainless steel, 19% Cr, 9% Ni, 0.45% Mn, and rest Fe) was obtained in 1 M NaCl solution. The obtained corrosion data from the optical interferometry technique, as a zero resistance ammeter were compared with corrosion data obtained on the same alloys in the specified solutions from an electronic zero resistance ammeter as well as from the linear polarization method. The comparison among the three techniques indicates that there is contrast in the results among the investigated alloys. In general, the results of the optical interferometry were found in agreement with the electronic zero resistance ammeter as compared with the linear polarization method. As a result, the optical interferometry can be considered as a useful zero resistance Ammeter for measuring the corrosion current density of metallic electrodes in aqueous solutions at the open circuit potential of the electrodes in the aqueous solutions.

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In-situ monitoring of pitting corrosion of copper alloys by holographic interferometry

Cited by 45 publications

References 2 publications

DL capacitance–emission spectroscopy of determining the electrochemical behavior of anodized aluminum in aqueous solutions

DL capacitance–emission spectroscopy of determining the electrochemical behavior of anodized aluminum in aqueous solutions

Modified electrochemical emission spectroscopy (MEES) of detection of crevice corrosion of metallic alloys

Laser optical interferometry as a zero resistance ammeter: fundamental and applications

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